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diff --git a/docs/apex/APEX-Developer-Guide.rst b/docs/apex/APEX-Developer-Guide.rst new file mode 100644 index 00000000..d5f16d56 --- /dev/null +++ b/docs/apex/APEX-Developer-Guide.rst @@ -0,0 +1,1471 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 + + +APEX Developer Guide +******************** + +.. contents:: + :depth: 3 + +Build APEX from Source +^^^^^^^^^^^^^^^^^^^^^^ + +Introduction to building APEX +----------------------------- + + .. container:: paragraph + + APEX is written 100% in Java and uses `Apache + Maven <https://maven.apache.org/>`__ as the build system. + The requirements for building APEX are: + + .. container:: ulist + + - An installed Java development kit for Java version 8 + or higher + + .. container:: ulist + + - To install a Java SDK please follow these + guidelines `Oracle Java 8 + SDK <https://docs.oracle.com/javase/8/docs/technotes/guides/install/install_overview.html>`__. + + - Maven 3 + + .. container:: ulist + + - To get Maven 3 running please follow the + guidelines for + `Download <https://maven.apache.org/download.cgi>`__ + and + `Install <https://maven.apache.org/install.html>`__, + and `Run <https://maven.apache.org/run.html>`__ + Maven + + - A clone of the APEX source repositories + + .. container:: paragraph + + To get a clone of the APEX source repositories, please + see the APEX Installation Guide or the APEX User manual. + + .. container:: paragraph + + One all requirements are in place, APEX can be build. + There are several different artifacts one can create + building APEX, most of them defined in their own + *profile*. APEX can also be build in a standard way with + standard tests (``mvn clean install``) or without + standard tests (``mvn clean install -DskipTests``). + + .. container:: paragraph + + The examples in this document assume that the APEX source + repositories are cloned to: + + .. container:: ulist + + - Unix, Cygwin: ``/usr/local/src/apex`` + + - Windows: ``C:\dev\apex`` + + - Cygwin: ``/cygdrive/c/dev/apex`` + + .. important:: + A Build requires ONAP Nexus + APEX has a dependency to ONAP parent projects. You might need to adjust your Maven M2 settings. The most current + settings can be found in the ONAP oparent repo: `Settings <https://git.onap.org/oparent/plain/settings.xml>`__. + + .. important:: + + A Build needs Space + Building APEX requires approximately 2-3 GB of hard disc space, 1 GB for the actual build with full + distribution and 1-2 GB for the downloaded dependencies + + .. important:: + A Build requires Internet (for first build to download all dependencies and plugins) + During the build, several (a lot) of Maven dependencies will be downloaded and stored in the configured local Maven + repository. The first standard build (and any first specific build) requires Internet access to download those + dependencies. + + .. important:: + Building RPM distributions + RPM images are only build if the ``rpm`` package is installed (Unix). To install ``rpm`` + run ``sudo apt-get install rpm``, then build APEX. + +Standard Build +-------------- + + .. container:: paragraph + + Use Maven to for a standard build without any tests. + + +-----------------------------------+------------------------------------+ + | Unix, Cygwin | Windows | + +===================================+====================================+ + | :: | :: | + | | | + | >c: | # cd /usr/local/src/apex | + | >cd \dev\apex | # mvn clean install -DskipTests | + | >mvn clean install -DskipTests | | + | | | + +-----------------------------------+------------------------------------+ + +.. container:: paragraph + + The build takes about 6 minutes on a standard development laptop. It + should run through without errors, but with a lot of messages from + the build process. + +.. container:: paragraph + + When Maven is finished with the build, the final screen should look + similar to this (omitting some ``success`` lines): + +.. container:: listingblock + + .. code:: bash + :number-lines: + + [INFO] tools .............................................. SUCCESS [ 0.248 s] + [INFO] tools-common ....................................... SUCCESS [ 0.784 s] + [INFO] simple-wsclient .................................... SUCCESS [ 3.303 s] + [INFO] model-generator .................................... SUCCESS [ 0.644 s] + [INFO] packages ........................................... SUCCESS [ 0.336 s] + [INFO] apex-pdp-package-full .............................. SUCCESS [01:10 min] + [INFO] Policy APEX PDP - Docker build 2.0.0-SNAPSHOT ...... SUCCESS [ 10.307 s] + [INFO] ------------------------------------------------------------------------ + [INFO] BUILD SUCCESS + [INFO] ------------------------------------------------------------------------ + [INFO] Total time: 03:43 min + [INFO] Finished at: 2018-09-03T11:56:01+01:00 + [INFO] ------------------------------------------------------------------------ + +.. container:: paragraph + + The build will have created all artifacts required for an APEX + installation. The following example show how to change to the target + directory and how it should look like. + ++-----------------------------------------------------------------------------------------------------------------------------+ +| Unix, Cygwin | ++=============================================================================================================================+ +| .. container:: | +| | +| .. container:: listingblock | +| | +| .. code:: bash | +| :number-lines: | +| | +| # cd packages/apex-pdp-package-full/target | +| # ls -l | +| -rwxrwx---+ 1 esvevan Domain Users 772 Sep 3 11:55 apex-pdp-package-full_2.0.0~SNAPSHOT_all.changes* | +| -rwxrwx---+ 1 esvevan Domain Users 146328082 Sep 3 11:55 apex-pdp-package-full-2.0.0-SNAPSHOT.deb* | +| -rwxrwx---+ 1 esvevan Domain Users 15633 Sep 3 11:54 apex-pdp-package-full-2.0.0-SNAPSHOT.jar* | +| -rwxrwx---+ 1 esvevan Domain Users 146296819 Sep 3 11:55 apex-pdp-package-full-2.0.0-SNAPSHOT-tarball.tar.gz* | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 archive-tmp/ | +| -rwxrwx---+ 1 esvevan Domain Users 89 Sep 3 11:54 checkstyle-cachefile* | +| -rwxrwx---+ 1 esvevan Domain Users 10621 Sep 3 11:54 checkstyle-checker.xml* | +| -rwxrwx---+ 1 esvevan Domain Users 584 Sep 3 11:54 checkstyle-header.txt* | +| -rwxrwx---+ 1 esvevan Domain Users 86 Sep 3 11:54 checkstyle-result.xml* | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 classes/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 dependency-maven-plugin-markers/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 etc/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 examples/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:55 install_hierarchy/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 maven-archiver/ | ++-----------------------------------------------------------------------------------------------------------------------------+ + ++-----------------------------------------------------------------------------------------------------------------------------+ +| Windows | ++=============================================================================================================================+ +| .. container:: | +| | +| .. container:: listingblock | +| | +| .. code:: bash | +| :number-lines: | +| | +| >cd packages\apex-pdp-package-full\target | +| >dir | +| | +| 03/09/2018 11:55 <DIR> . | +| 03/09/2018 11:55 <DIR> .. | +| 03/09/2018 11:55 146,296,819 apex-pdp-package-full-2.0.0-SNAPSHOT-tarball.tar.gz | +| 03/09/2018 11:55 146,328,082 apex-pdp-package-full-2.0.0-SNAPSHOT.deb | +| 03/09/2018 11:54 15,633 apex-pdp-package-full-2.0.0-SNAPSHOT.jar | +| 03/09/2018 11:55 772 apex-pdp-package-full_2.0.0~SNAPSHOT_all.changes | +| 03/09/2018 11:54 <DIR> archive-tmp | +| 03/09/2018 11:54 89 checkstyle-cachefile | +| 03/09/2018 11:54 10,621 checkstyle-checker.xml | +| 03/09/2018 11:54 584 checkstyle-header.txt | +| 03/09/2018 11:54 86 checkstyle-result.xml | +| 03/09/2018 11:54 <DIR> classes | +| 03/09/2018 11:54 <DIR> dependency-maven-plugin-markers | +| 03/09/2018 11:54 <DIR> etc | +| 03/09/2018 11:54 <DIR> examples | +| 03/09/2018 11:55 <DIR> install_hierarchy | +| 03/09/2018 11:54 <DIR> maven-archiver | +| 8 File(s) 292,652,686 bytes | +| 9 Dir(s) 14,138,720,256 bytes free | ++-----------------------------------------------------------------------------------------------------------------------------+ + + +Checkstyle with Maven +--------------------- + + .. container:: paragraph + + The codestyle for all APEX java projects can be checked + automatically. The checks include empty or non-existing Javadocs. + Any checkstyle run should complete without any errors, some + warnings are acceptable. + + .. container:: paragraph + + To run checkstyle on an APEX Maven project use: + + .. container:: listingblock + + .. container:: content + + .. code:: bash + + mvn checkstyle:check + + .. container:: paragraph + + To run checkstyle on all modules use: + + .. container:: listingblock + + .. container:: content + + .. code:: bash + + mvn checkstyle:checkstyle -DapexAll + +Build with standard Tests +------------------------- + + .. container:: paragraph + + Use Maven to for a standard build with standard tests. + + .. important:: + Some tests have specific timing Requirements + Some of the tests have very specific timing requirements. If run on a low-powered build machine, or if the build + machine is on high load, those tests might fail and the whole build might fail as well. If this happens, reduce the load + on your build machine and restart the build. + + +-----------------------------------+-----------------------------------+ + | Unix, Cygwin | Windows | + +===================================+===================================+ + | .. container:: | .. container:: | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: bash | .. code:: bash | + | :number-lines: | :number-lines: | + | | | + | >c: | # cd /usr/local/src/apex | + | >cd \dev\apex | # mvn clean install | + | >mvn clean install | | + +-----------------------------------+-----------------------------------+ + + +.. container:: paragraph + + The build takes about 10 minutes with tests on a standard development + laptop. It should run through without errors, but with a lot of + messages from the build process. If build with tests (i.e. without + ``-DskipTests``), there will be error messages and stack trace prints + from some tests. This is normal, as long as the build finishes + successful. + +Build with all Tests +-------------------- + + .. container:: paragraph + + Use Maven to for a standard build with *all* tests. + + .. important:: + Some tests have specific timing Requirements. + Some of the tests have very specific timing requirements. If run on a low-powered build machine, or if the build + machine is on high load, those tests might fail and the whole build might fail as well. If this happens, reduce the load + on your build machine and restart the build. + + .. important:: + Might require specific software. + When running all tests, some modules require specific software installed on the build machine. For instance, + testing the full capabilities of context (with distribution and persistence) will require Hazelcast and Infinispan + installed on the build machine. + + +----------------------------------------------+----------------------------------------------+ + | Unix, Cygwin | Windows | + +==============================================+==============================================+ + | .. container:: | .. container:: | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: bash | .. code:: bash | + | :number-lines: | :number-lines: | + | | | + | >c: | # cd /usr/local/src/apex | + | >cd \dev\apex | # mvn clean install -DallTests | + | >mvn clean install -DallTests | | + +----------------------------------------------+----------------------------------------------+ + +Build with all Components +------------------------- + + .. container:: paragraph + + A standard APEX build will not build all components. Some parts + are for specific deployments, only. Use Maven to for a standard + build with *all* components. + + .. important:: + Might require specific software. + When building all components, some modules require specific software installed on the build machine. + + +----------------------------------------------+----------------------------------------------+ + | Unix, Cygwin | Windows | + +==============================================+==============================================+ + | .. container:: | .. container:: | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: bash | .. code:: bash | + | :number-lines: | :number-lines: | + | | | + | >c: | # cd /usr/local/src/apex | + | >cd \dev\apex | # mvn clean install -DapexAll | + | >mvn clean install -DapexAll | | + +----------------------------------------------+----------------------------------------------+ + + +Build the APEX Documentation +---------------------------- + + .. container:: paragraph + + The APEX Maven build also includes stand-alone documentations, + such as the HowTo documents, the Installation Guide, and the User + Manual. Use Maven to build the APEX Documentation. The Maven + options ``-N`` prevents Maven to go through all APEX modules, + which is not necessary for the documentation. The final documents + will be in ``target/generated-docs`` (Windows: + ``target\generated-docs``). The *HTML* documents are in the + ``html/`` folder, the *PDF* documents are in the ``pdf/`` folder. + Once the documentation is build, copy the *HTML* and *PDF* + documents to a folder of choice + + +-------------------------------------------------------+--------------------------------------------------------+ + | Unix, Cygwin | Windows | + +=======================================================+========================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: bash | .. code:: bash | + | :number-lines: | :number-lines: | + | | | + | >c: | # cd /usr/local/src/apex | + | >cd \dev\apex | # mvn clean generate-resources -N -DapexDocs | + | >mvn clean generate-resources -N -DapexDocs | | + +-------------------------------------------------------+--------------------------------------------------------+ + +Build APEX Site +--------------- + + .. container:: paragraph + + The APEX Maven build comes with full support to build a web site + using Maven Site. Use Maven to build the APEX Site. Stage the APEX + web site. The target folder for the staged site is + + .. container:: ulist + + - Unix: ``/usr/local/src/apex/target/ad-site`` + + - Windows: ``C:\dev\apex\target\ad-site`` + + - Cygwin: ``/cygdrive/c/dev/apex/target/ad-site`` + + .. container:: paragraph + + Once the web site is staged, copy the full site to a folder of + choice or into a web server. + + .. important:: + Building a Site takes Time. + Building and staging the APEX web site can take very long. The stand-alone documentation will take about 2 minutes. The + sites for all modules and projects and the main APEX site can take between 10-30 minutes depending on your build machine (~10 minutes + without generating source and test-source reports, closer to 30 minutes with all reports). + + .. container:: paragraph + + Start the build deleting the staging directory that might have + been created by a previous site build. Then go to the APEX + packaging directory. + + +--------------------------------+-----------------------------------+----------------------------------+ + | Unix | Windows | Cygwin | + +================================+===================================+==================================+ + | .. container:: | .. container:: | .. container:: | + | | | | + | .. container:: content | .. container:: content | .. container:: content | + | | | | + | .. code:: bash | .. code:: bash | .. code:: bash | + | :number-lines: | :number-lines: | :number-lines: | + | | | | + | cd /usr/local/src/apex | c: | cd /cygdrive/c/dev/apex | + | rm -fr target/ad-site | cd \dev\apex | rm -fr target/ad-site | + | | rmdir /s/q target\ad-site | | + +--------------------------------+-----------------------------------+----------------------------------+ + + .. container:: paragraph + + the workflow for building a complete site then is as follows: + + .. container:: listingblock + + .. container:: content + + .. code:: bash + + mvn clean -DapexAll (1) + mvn install -DskipTests (2) + mvn generate-resources -N -DapexDocs (3) + mvn initialize site:attach-descriptor site site:stage -DapexSite (4) + + .. container:: olist arabic + + #. First clean all modules to remove any site artifacts, use the + *apexXtext* profile to make sure these modules are processed as + well + + #. Next run a simple install without tests + + #. Now generate the APEX stand -alone documentation, they are in + the local package only so we can use the *-N* switch + + #. Last build the actual sites and stage (copy to the staging + directory) with the profile *apexSite* (do not forget the + initialize goal, otherwise the staging directory will not be + correctly set and sites are staged in every model in a + directory called ``docs``). + + .. container:: paragraph + + If you want to build the site for a particular project for + testing, the Maven command is simpler. Since only the main project + has APEX documentation (stand-alone), you can use Maven as follow. + + .. container:: listingblock + + .. container:: content + + .. code:: bash + + mvn clean site -DapexSite + + .. container:: paragraph + + If you want to stage the tested site, then use + + .. container:: listingblock + + .. container:: content + + .. code:: bash + + mvn clean initialize site:attach-descriptor site site:stage -DapexSite + +APEX Codestyle +^^^^^^^^^^^^^^ + +Introduction: APEX Codestyle +---------------------------- + + .. container:: paragraph + + This page describes how to apply a code style to the APEX + Java projects. The provided code templates are guidelines + and are provided for references and as examples. We will not + engage in "holy war" on style for coding. As long as the + style of a particular block of code is understandable, + consistent, and readable, please feel free to adapt or + modify these guides or use other guides as you see fit. + + .. container:: paragraph + + The JAutoDoc and Checkstyle Eclipse Plugins and tools are + useful and remove a lot of the tedium from code + documentation. Use them to check your code and please fix + any issues they identify with your code. + + .. container:: paragraph + + Since APEX is part of ONAP, the general ONAP rules and + guideliness for development do apply. Please see `ONAP + Wiki <https://wiki.onap.org/display/DW/Developing+ONAP>`__ + for details. + +Java coding Rules +----------------- + + .. container:: ulist + + - APEX is (in large parts) a platform (or middleware), so + `Software Design + Patterns <https://en.wikipedia.org/wiki/Software_design_pattern>`__ + are a good thing + + - The `Solid + Principles <https://en.wikipedia.org/wiki/SOLID_(object-oriented_design)>`__ + apply + + - Avoid class fields scoped as ``protected`` + + .. container:: ulist + + - They break a lot of good design rules, e.g. most + SOLID rules + + - For a discussion see this `Stackoverflow + Question <https://softwareengineering.stackexchange.com/questions/162643/why-is-clean-code-suggesting-avoiding-protected-variables>`__ + + - If you absolutely need ``protected`` class fields they + should be ``final`` + + - Avoid ``default`` scope for class fields and methods + + .. container:: ulist + + - For fields: use ``public`` or ``private`` (see also + above) + + - For methods: use ``public`` for general use, + ``protected`` for specialization using inheritance + (ideally ``final``), ``private`` for everything + else + + - Method parameters that are not changed in the method + should be marked ``final`` + + - Every package must have a ``package-info.java`` file with + an appropriate description, minimum a descriptive one + liner + + - Every class must have + + .. container:: ulist + + - The common header (copyright, file, date) + + - Javadoc header for the class with description of + the class and author + + - Javadoc for *all public\_* fields + + - If possible, Javadoc for *private* fields, at least + some documentation for private fields + + - Javadoc for *all* methods + + - All project must build with all tests on Unix, Windows, + *and* Cygwin + + .. container:: ulist + + - Support all line endings in files, e.g. ``\n`` and + ``\r\n`` + + - Be aware of potential differences in exception + messages, if testing against a message + + - Support all types of paths: Unix with ``/``, + Windows with an optinal drive ``C:\`` and ``\``, + Cygwin with mixed paths + +Eclipse Plugin: JAutodoc +------------------------ + + .. container:: paragraph + + This plugin is a helper plugin for writing Javadoc. It will + automatically create standard headers on files, create + package-info.java files and will put in remarkably good stub + Javadoc comments in your code, using class names and method + names as hints. + + .. container:: paragraph + + Available from the Eclipse Marketplace. In Eclipse + Help→Eclipse Marketplace… and type ``JAutodoc``. Select + JAutodoc when the search returns and install it. + + .. container:: paragraph + + You must configure JAutoDoc in order to get the most out of + it. Ideally JAutoDoc should be configured with templates + that cooperate with the inbuilt Eclipse Code Formatter for + best results. + +Eclipse Plugin: Checkstyle +-------------------------- + + .. container:: paragraph + + This plugin integrates + `Checkstyle <http://checkstyle.sourceforge.net/>`__ into + Eclipse. It will check your code and flag any checkstyle + issues as warnings in the code. + + .. container:: paragraph + + Available from the Eclipse Marketplace. In Eclipse + Help→Eclipse Marketplace… and type "Checkstyle". Select + "Checkstyle Plug-in" when the search returns and install it. + Note that "Checkstyle Plug-in" may not be the first result + in the list of items returned. + + .. container:: paragraph + + For APEX, the ONAP checkstyle rules do apply. The + configuration is part of the ONAP parent. See `ONAP + Git <https://git.onap.org/oparent/plain/checkstyle/src/main/resources/onap-checkstyle/>`__ + for details and updates. All settings for checkstyle are + already part of the code (POM files). + +Configure Eclipse +----------------- + + .. container:: ulist + + - Set the template for Eclipse code clean up + + .. container:: olist arabic + + #. Eclipse Window Preferences Java Code Style + Clean Up → Import… + + #. Select your template file + (``ApexCleanUpTemplate.xml``) and apply it + + - Set the Eclipse code templates + + .. container:: olist arabic + + #. Eclipse Window Preferences Java Code Style + Code Templates → Import… + + #. Select your templates file + (``ApexCodeTemplates.xml``) and apply it + + .. container:: ulist + + - Make sure to set your email address in + generated comments by selecting + "Comments→Types" in the "Configure generated + code and comments:" pane, then change the + email address on the @author tag to be your + email address + + - Set the Eclipse Formatter profile + + .. container:: olist arabic + + #. Eclipse Window Preferences Java Code Style + Formatter → Import… + + #. Select your formatter profile file + (``ApexFormatterProfile.xml``) and apply it + + .. container:: paragraph + + The templates mentioned above can be found in + ``apex-model/apex-model.build-tools/src/main/resources/eclipse`` + +Configure JAutodoc (Eclipse) +---------------------------- + + .. container:: paragraph + + Import the settings for JAutodoc: + + .. container:: olist arabic + + #. Eclipse Window Preferences Java JAutodoc → Import + All… (at bottom of the JAutodoc preferences window) + + #. Leave all the preferences ticked to import all + preferences, browse to the JAutodoc setting file + (``ApexJautodocSettings.xml``) and press OK + + #. Set your email address in the package Javadoc template + + .. container:: ulist + + - Press Edit Template… in the Package Javadoc area + of the JAutodoc preferences window, and change the + email address on the ``@author`` tag to be your + email address + + #. Now, apply the JAutodoc settings + + .. container:: paragraph + + The templates mentioned above can be found in + ``apex-model/apex-model.build-tools/src/main/resources/eclipse`` + +Configure Checkstyle (Maven) +---------------------------- + + .. container:: paragraph + + When using a custom style configuration with Checkstyle, the + definition of that style must of course be available to + Checkstyle. In order not to have to distribute style files + for checkstyle into all Maven modules, it is recommended + that a special Maven module be built that contains the + checkstyle style definition. That module is then used as a + dependency in the *POM* for all other modules that wish to + use that checkstyle style. For a full explanation see `the + explanation of Checkstyle multi-module + configuration <https://maven.apache.org/plugins/maven-checkstyle-plugin/examples/multi-module-config.html>`__. + + .. container:: paragraph + + For APEX, the ONAP checkstyle rules do apply. The + configuration is part of the ONAP parent. See `ONAP + Git <https://git.onap.org/oparent/plain/checkstyle/src/main/resources/onap-checkstyle/>`__ + for details and updates. + +Run Checkstyle (Maven) +---------------------- + + .. container:: paragraph + + Run Checkstyle using Maven on the command line with the + command: + + .. container:: listingblock + + .. container:: content + + .. code:: bash + + mvn checkstyle:check + + .. container:: paragraph + + On the main APEX project, run a full checkstyle check as: + + .. container:: listingblock + + .. container:: content + + .. code:: bash + + mvn checkstyle:checkstyle -DapexAll + +Configure Checkstyle (Eclipse, globally) +---------------------------------------- + + .. container:: olist arabic + + #. Set up a module with the Checkstyle style files (see + above) + + #. In Eclipse Window Preferences go to Checkstyle + + #. Import the settings for Checkstyle + + .. container:: ulist + + - Press New… to create a new *Global Check + Configurations* entry + + - Give the configuration a name such as *Apex + Checkstyle Configuration* and select the *External + Configuration File* form in the *Type* drop down + menu + + - Browse to the Checckstyle setting file + (``ApexCheckstyleSettings.xml``) and press OK + + #. Press OK + + .. container:: ulist + + - You may now get an *Unresolved Properties found* + dialogue + + - This is because there is a second Checkstyle + configuration file required to check file headers + + #. Press Edit Properties… and press Find unresolved + properties on the next dialogue window + + #. The plugin will find the ``${checkstyle.header.file}`` + property is unresolved and will ask should it be added to + the properties, click yes + + #. Now, select the row on the dialogue for the + ``checkstyle.header.file property`` and click Edit… + + #. Set the value of the ``checkstyle.header.file property`` + to + ``<your-apex-git-location>/apex-model/apex-model.build-tools/src/main/resources/checkstyle/apex_header.txt`` + + .. container:: ulist + + - Of course replacing the tag + ``<your-apex-git-location>`` with the location of + your Apex GIT repository + + #. Press OK, OK, OK to back out to the main Checkstyle + properties window + + #. Select the *Apex Checkstyle Configuration* as your + default configuration by selecting its line in the + *Global Check Configuraitons* list and clicking Set as + Default + + #. Press Apply and Close to finish Checkstyle global + configuration + + .. container:: paragraph + + The templates mentioned above can be found in + ``apex-model/apex-model.build-tools/src/main/resources/eclipse`` + +2.10. Configure Checkstyle Blueprint +------------------------------------ + + .. container:: paragraph + + As well as being configured globally, Checkstyle must be + configured and activated for each project in Eclipse. In + order to make this process less tedious, set up the first + project you apply Checkstye to as a blueprint project and + then use this blueprint for all other projects. + + .. container:: olist arabic + + #. Select the project you want to use as a blueprint + + .. container:: ulist + + - For example, ``apex-model.basic-model`` in ``apex`` + and enter the project properties by right clicking + and selecting **Properties** + + #. Click *Checkstyle* on the properties to get the + Checkstyle project configuration window + + #. Click the box *Checkstyle active for this project* and in + the *Exclude from checking…* list check the boxes: + + .. container:: ulist checklist + + - *files outside source directories* + + - *derived (generated) files* + + - *files from packages:* + + #. Now, in order to turn off checking on resource + directories and on JUnit tests + + .. container:: ulist + + - Select the line *files from packages:* in the + *Exclude from checking…* list and click Change… + + #. On the *Filter packages* dialogue + + .. container:: ulist + + - Check all the boxes except the top box, which is + the box for *src/main/java* + + - Ensure that the *recursively exclude sub-packages* + check box is ticked + + .. container:: ulist checklist + + - *recursively exclude sub-packages* + + - Press OK + + #. Press Apply and Close to apply the changes + +Use Eclipse Source Operations +----------------------------- + + .. container:: paragraph + + Eclipse Source Operations can be carried out on individual + files or on all the files in a package but do not recurse + into sub-packages. They are available as a menu in Eclipse + by selecting a file or package and right clicking on + *Source*. Note that running *Clean Up…* with the Apex clean + up profile will run *Format* and *Organize Imports*. So if + you run a clean up on a file or package, you need not run + *Format* or *Organize Imports*. + + .. container:: paragraph + + We recommend you use the following Eclipse Source + Operations: + + .. container:: olist arabic + + #. *Format* applies the current format definition to the + file or all files in a package + + #. *Organize Imports* sorts the imports on each file in + standard order + + #. *Clean Up* runs a number of cleaning operations on each + file. The Apex clean up template + + .. container:: ulist + + - Remove ``this`` qualifier for non static field + accesses + + - Change non static accesses to static members using + declaring type + + - Change indirect accesses to static members to + direct accesses (accesses through subtypes) + + - Convert control statement bodies to block + + - Convert ``for`` loops to enhanced ``for`` loops + + - Add final modifier to private fields + + - Add final modifier to local variables + + - Remove unused imports + + - Remove unused private methods + + - Remove unused private constructors + + - Remove unused private types + + - Remove unused private fields + + - Remove unused local variables + + - Add missing ``@Override`` annotations + + - Add missing ``@Override`` annotations to + implementations of interface methods + + - Add missing ``@Deprecated`` annotations + + - Add missing serial version ID (generated) + + - Remove unnecessary casts + + - Remove unnecessary ``$NON-NLS$`` tags + + - Organize imports + + - Format source code + + - Remove trailing white spaces on all lines + + - Correct indentation + + - Remove redundant type arguments + + - Add file header (JAutodoc) + +Using JAutodoc +-------------- + + .. container:: paragraph + + Similar to Eclipse Source Operations, JAutodoc operations + can be carried out on individual files or on all the files + in a package but do not recurse into sub-packages. The + JAutodoc operations are available by selecting a file or + package and right clicking on *JAutodoc*: + + .. container:: olist arabic + + #. To add a ``package-info.java`` file to a package, select + the package and right-click Jautodoc Add Package Javadoc + + #. To add headers to files select on a file (or on the + package to do all files) and right click JAutodoc Add + Header + + #. To add JAutodoc stubs to a files, select on a file (or on + the package to do all files) and right click JAutodoc + Add Javadoc + +Using Checkstyle +---------------- + + .. container:: paragraph + + In order to use Checkstyle, you must configure it per + project and then activate it per project. The easiest way to + do this is to set up one project as a blueprint and use that + blueprint for other projects (see above). Once you have a + blueprint project, you can use Checkstyle on other projects + as follows + + .. container:: olist arabic + + #. Set up Checkstyle on projects by selecting one or more + projects + + .. container:: ulist + + - Right clicking and selecting Checkstyle Configure + project(s) from *blueprint…* and then selecting + your blueprint project + + - (for example ``apex-model.basic-model``) from the + list of projects and pressing OK + + #. Activate Checkstyle on projects by selecting one or more + projects + + .. container:: ulist + + - Right clicking and selecting Checkstyle Activate + Checkstyle + + - Now Checkstyle warnings will appear on the selected + projects if they have warnings + + #. You can disable Checkstyle checking on a file or a + package (recursively) by selecting a file or package + + .. container:: ulist + + - Right clicking and selecting Checkstyle Clear + Checkstyle violations + + #. You can enable Checkstyle checking on a file or a package + (recursively) by selecting a file or package + + .. container:: ulist + + - Right clicking and selecting Checkstyle Check Code + with Checkstyle + + #. On individual files, you can apply fixes that clear some + Checkstyle warnings + + .. container:: ulist + + - Select the file, right click and select **Apply + Checkstyle fixes** + +Disable Eclipse Formatting (partially) +-------------------------------------- + + .. container:: paragraph + + Sometimes, the Eclipse code formatting results in correct + but untidy indentation, for example when Java Persistence + annotations or long sequences of lined-up assignments are + formatted. You can disable formatting for sections of code. + + .. container:: olist arabic + + #. Ensure that Off/On Tags are enabled in Eclipse + + #. In Eclipse Window Preferences Java Code Style + Formatter window press Edit… + + #. Click on the *Off/On Tags* tab + + #. Ensure that the *Enable Off/On Tags* checkbox is checked + + #. Surround the section of code that you do not want the + formatter to act on with comments containing the Off/On + tags + + .. container:: listingblock + + .. container:: content + + .. code:: java + :number-lines: + + // @formatter:off + // Plugin Parameters + private DistributorParameters distributorParameters = new DistributorParameters(); + private SchemaParameters schemaParameters = new SchemaParameters(); + private LockManagerParameters lockManagerParameters = new LockManagerParameters(); + private PersistorParameters persistorParameters = new PersistorParameters(); + // @formatter:on + +Supress Checkstyle (partially) +------------------------------ + + .. container:: paragraph + + Sometimes Checkstyle checks identify code that does not comply + with Checkstyle rules. In limited cases Checkstyle rules can be + suppressed, for example where it is impossible to design the code + in a way that complies with Checkstyle or where the Checkstyle + rule is impossible to apply. Checkstyle rules are suppressed as is + explained in this `Stackoverflow + post <https://stackoverflow.com/questions/4023185/how-to-disable-a-particular-checkstyle-rule-for-a-particular-line-of-code>`__. + + .. container:: paragraph + + The example below illustrates how to suppress a Checkstyle rule + that specifies all methods must have seven parameters or less. + + .. container:: listingblock + + .. container:: content + + .. code:: java + :number-lines: + + // CHECKSTYLE:OFF: checkstyle:ParameterNumber + public myMethod(final int par1, final int par2, final int par3, final int par4, + final int par5, final int par6, final int par7, final int par8) { + } + // CHECKSTYLE:ON: checkstyle:ParameterNumber + +apex-apps.utilities +^^^^^^^^^^^^^^^^^^^ + +CLI Example +----------- + + .. container:: paragraph + + Using the APEX CLI utilities can be done as follows. First, + add the dependency of the utility project to your POM file. + + .. container:: listingblock + + .. container:: content + + .. code:: bash + + <dependency> + <groupId>org.onap.policy.apex-pdp.tools</groupId> + <artifactId>tools-common</artifactId> + <version>2.0.0-SNAPSHOT</version> + </dependency> + + .. container:: paragraph + + Now, create a new application project, for instance + ``MyApp``. In this project, create a new main application + class as ``Application.java``. In this class, create a new + main method as ``public static void main(String[] args)``. + + .. container:: paragraph + + No use the provided ``CliOptions`` and ``CliParser``. + Manually importing means to add the following lines to the + start of your application (in Eclipse this import will be + done automatically): + + .. container:: listingblock + + .. container:: content + + .. code:: java + :number-lines: + + import org.onap.policy.apex.tools.common.CliOptions; + import org.onap.policy.apex.tools.common.CliParser; + +.. container:: paragraph + + Now, inside your ``main()`` method, start setting some general + application properties. Important are the application name and some + description of your application. For instance: + +.. container:: listingblock + + .. container:: content + + .. code:: java + :number-lines: + + String appName = "test-app"; + final String appDescription = "a test app for documenting how to use the CLI utilities"; + +.. container:: paragraph + + Next, create a new CLI Parser and add a few CLI options from the + standard ``CliOptions``. The following example adds options for help, + version, and a model file: + +.. container:: listingblock + + .. container:: content + + .. code:: java + :number-lines: + + final CliParser cli = new CliParser(); + cli.addOption(CliOptions.HELP); + cli.addOption(CliOptions.VERSION); + cli.addOption(CliOptions.MODELFILE); + +.. container:: paragraph + + Next, parse the given CLI arguments: + +.. container:: listingblock + + .. container:: content + + .. code:: java + :number-lines: + + final CommandLine cmd = cli.parseCli(args); + +.. container:: paragraph + + Once the command line is parsed, we can look into the individual + options, check if they are set, and then act accordingly. We start + with the option for *help*. If the option is present, we print a help + screen and return: + +.. container:: listingblock + + .. container:: content + + .. code:: java + :number-lines: + + // help is an exit option, print usage and exit + if (cmd.hasOption('h') || cmd.hasOption("help")) { + final HelpFormatter formatter = new HelpFormatter(); + LOGGER.info(appName + " v" + cli.getAppVersion() + " - " + appDescription); + formatter.printHelp(appName, cli.getOptions()); + return; + } + +.. container:: paragraph + + Next, we process the option for *version*. Here, we want to print a + version for our application and return. The CLI Parser already + provides a method to obtain the correct version for an APEX build, so + we use that: + +.. container:: listingblock + + .. container:: content + + .. code:: java + :number-lines: + + // version is an exit option, print version and exit + if (cmd.hasOption('v') || cmd.hasOption("version")) { + LOGGER.info(appName + " " + cli.getAppVersion()); + return; + } + +.. container:: paragraph + + Once help and version arguments are processed, we can proceed to look + at all other options. We have added an option for a model file, so + check this option and test if we can actually load a model file with + the given argument. If we can load a model, everything is ok. If we + cannot load a model, we print an error and return. + +.. container:: listingblock + + .. container:: content + + .. code:: java + :number-lines: + + String modelFile = cmd.getOptionValue('m'); + if (modelFile == null) { + modelFile = cmd.getOptionValue("model"); + } + if (modelFile == null) { + LOGGER.error(appName + ": no model file given, cannot proceed (try -h for help)"); + return; + } + +.. container:: paragraph + + With a model file being loadable, we finish parsing command line + arguments. We also print some status messages to note that the + application now is ready to start: + +.. container:: listingblock + + .. container:: content + + .. code:: java + :number-lines: + + LOGGER.info(appName + ": starting"); + LOGGER.info(" --> model file: " + modelFile); + +.. container:: paragraph + + The last action now is to run the actual application. The example + below is taken from a version of the ``Model2Cli`` application, which + creates a new object and runs it in a ``try`` block, since exceptions + might be thrown by the object: + +.. container:: listingblock + + .. container:: content + + .. code:: java + :number-lines: + + // your code for the application here + // e.g. + // try { + // Model2Cli app = new Model2Cli(modelFile, !cmd.hasOption("sv"), appName); + // app.runApp(); + // } + // catch(ApexException aex) { + // LOGGER.error(appName + ": caught APEX exception with message: " + aex.getMessage()); + // } + +.. container:: paragraph + + If this new application is now called with the command line ``-h`` or + ``--help`` it will print the following help screen: + +.. container:: listingblock + + .. container:: content + + .. code:: bash + + test-app v2.0.0-SNAPSHOT - a test app for documenting how to use the CLI utilities + usage: test-app + -h,--help prints this help and usage screen + -m,--model <MODEL-FILE> set the input policy model file + -v,--version prints the application version + +.. container:: paragraph + + If this new application is called with the option ``-v`` or + ``--version`` it will print its version information as: + +.. container:: listingblock + + .. container:: content + + .. code:: bash + + test-app 2.0.0-SNAPSHOT + +Autoversioning an Application +----------------------------- + + .. container:: paragraph + + The APEX utilities project provides means to versioning an + application automatically towards the APEX version it is written + for. This is realized by generating a file called + ``app-version.txt`` that includes the Maven project version. This + file is then automatically deployed in the folder ``etc`` of a + full APEX distribution. The CLI Parser here provides a mthod to + access this version for an application. + + .. container:: paragraph + + First, create a new CLI Parser object, add some options (in the + example an option for version, but any options will do), then + parse the command line: + + .. container:: listingblock + + .. container:: content + + .. code:: java + :number-lines: + + final CliParser cli = new CliParser(); + cli.addOption(CliOptions.VERSION); + final CommandLine cmd = cli.parseCli(args); + +.. container:: paragraph + + Next, we check if the version option was used in the command line and + print application name and version if it was used: + +.. container:: listingblock + + .. container:: content + + .. code:: java + :number-lines: + + // version is an exit option, print version and exit + if (cmd.hasOption('v') || cmd.hasOption("version")) { + LOGGER.info("myApp" + " " + cli.getAppVersion()); + return; + } + +.. container:: paragraph + + The output will be: + +.. container:: listingblock + + .. container:: content + + .. code:: bash + + myApp 2.0.0-SNAPSHOT + +.. container:: paragraph + + The auto-version information comes from the method call + ``cli.getAppVersion()`` in line 2 in the example above. The method is + defined in the ``CliParser`` class as: + +.. container:: listingblock + + .. container:: content + + .. code:: java + :number-lines: + + public String getAppVersion() { + return new Scanner(CliParser.class.getResourceAsStream("/app-version.txt"), "UTF-8").useDelimiter("\\A").next(); + } + +.. container:: paragraph + + The file ``app-version.txt`` is automatically added to an APEX full + distribution, as described above (for details on this see the POM + files in the APEX application packaging projects). + +.. container:: + :name: footer + + .. container:: + :name: footer-text + + 2.0.0-SNAPSHOT + Last updated 2018-09-04 16:04:24 IST diff --git a/docs/apex/APEX-Install-Guide.rst b/docs/apex/APEX-Install-Guide.rst new file mode 100644 index 00000000..3ac1eb23 --- /dev/null +++ b/docs/apex/APEX-Install-Guide.rst @@ -0,0 +1,1418 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 + + +APEX Installation Guide +*********************** + +.. contents:: + :depth: 3 + +Requirements +^^^^^^^^^^^^ + + .. container:: sectionbody + + .. container:: paragraph + + APEX is 100% written in Java and runs on any platform that + supports a JVM, e.g. Windows, Unix, Cygwin. Some APEX + applications (such as the monitoring application) come as + web archives, they do require a war-capable web server + installed. + +Installation Requirements +------------------------- + + .. container:: ulist + + - Downloaded distribution: JAVA runtime environment + (JRE, Java 8 or later, APEX is tested with the Oracle + Java) + + - Building from source: JAVA development kit (JDK, Java + 8 or later, APEX is tested with the Oracle Java) + + - A web archive capable webserver, for instance for the + monitoring application + + .. container:: ulist + + - for instance `Apache + Tomcat <https://tomcat.apache.org/>`__ + + - Sufficient rights to install APEX on the system + + - Installation tools depending on the installation + method used: + + .. container:: ulist + + - ZIP to extract from a ZIP distribution + + .. container:: ulist + + - Windows for instance + `7Zip <http://www.7-zip.org/>`__ + + - TAR and GZ to extract from that TAR.GZ + distribution + + .. container:: ulist + + - Windows for instance + `7Zip <http://www.7-zip.org/>`__ + + - RPM to install from the RPM distribution + + .. container:: ulist + + - Install: ``sudo apt-get install rpm`` + + - DPKG to install from the DEB distribution + + .. container:: ulist + + - Install: ``sudo apt-get install dpkg`` + +Feature Requirements +-------------------- + + .. container:: paragraph + + APEX supports a number of features that require extra + software being installed. + + .. container:: ulist + + - `Apache Kafka <https://kafka.apache.org/>`__ to + connect APEX to a Kafka message bus + + - `Hazelcast <https://hazelcast.com/>`__ to use + distributed hash maps for context + + - `Infinispan <http://infinispan.org/>`__ for + distributed context and persistence + + - `Docker <https://www.docker.com/>`__ to run APEX + inside a Docker container + +Build (Install from Source) Requirements +---------------------------------------- + + .. container:: paragraph + + Installation from source requires a few development tools + + .. container:: ulist + + - GIT to retrieve the source code + + - Java SDK, Java version 8 or later + + - Apache Maven 3 (the APEX build environment) + +Get the APEX Source Code +^^^^^^^^^^^^^^^^^^^^^^^^ + + .. container:: sectionbody + + .. container:: paragraph + + The first APEX source code was hosted on Github in January + 2018. By the end of 2018, APEX was added as a project in the + ONAP Policy Framework, released later in the ONAP Casablanca + release. + + .. container:: paragraph + + The APEX source code is hosted in ONAP as project APEX. The + current stable version is in the master branch. Simply clone + the master branch from ONAP using HTTPS. + + .. container:: listingblock + + .. container:: content + + .. code:: bash + :number-lines: + + git clone https://gerrit.onap.org/r/policy/apex-pdp + +Build APEX +^^^^^^^^^^ + + .. container:: sectionbody + + .. container:: paragraph + + The examples in this document assume that the APEX source + repositories are cloned to: + + .. container:: ulist + + - Unix, Cygwin: ``/usr/local/src/apex-pdp`` + + - Windows: ``C:\dev\apex-pdp`` + + - Cygwin: ``/cygdrive/c/dev/apex-pdp`` + + .. important:: + A Build requires ONAP Nexus + APEX has a dependency to ONAP parent projects. You might need to adjust your Maven M2 settings. The most current + settings can be found in the ONAP oparent repo: `Settings <https://git.onap.org/oparent/plain/settings.xml>`__. + + .. important:: + A Build needs Space + Building APEX requires approximately 2-3 GB of hard disc space, 1 GB for the actual build with full distribution and 1-2 GB for + the downloaded dependencies + + .. important:: + A Build requires Internet (for first build) + During the build, several (a lot) of Maven dependencies will be downloaded and stored in the configured local Maven + repository. The first standard build (and any first specific build) requires Internet access to download those dependencies. + + .. important:: + Building RPM distributions + RPM images are only build if the ``rpm`` package is installed (Unix). To install ``rpm`` run ``sudo apt-get install rpm``, + then build APEX. + + .. container:: paragraph + + Use Maven to for a standard build without any tests. + + +-------------------------------------------------------+--------------------------------------------------------+ + | Unix, Cygwin | Windows | + +=======================================================+========================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: bash | .. code:: bash | + | :number-lines: | :number-lines: | + | | | + | >c: | # cd /usr/local/src/apex-pdp | + | >cd \dev\apex | # mvn clean install -DskipTest | + | >mvn clean install -DskipTests | | + +-------------------------------------------------------+--------------------------------------------------------+ + +.. container:: paragraph + + The build takes 2-3 minutes on a standard development laptop. It + should run through without errors, but with a lot of messages from + the build process. + +.. container:: paragraph + + When Maven is finished with the build, the final screen should look + similar to this (omitting some ``success`` lines): + +.. container:: listingblock + + .. container:: content + + .. code:: bash + :number-lines: + + [INFO] tools .............................................. SUCCESS [ 0.248 s] + [INFO] tools-common ....................................... SUCCESS [ 0.784 s] + [INFO] simple-wsclient .................................... SUCCESS [ 3.303 s] + [INFO] model-generator .................................... SUCCESS [ 0.644 s] + [INFO] packages ........................................... SUCCESS [ 0.336 s] + [INFO] apex-pdp-package-full .............................. SUCCESS [01:10 min] + [INFO] Policy APEX PDP - Docker build 2.0.0-SNAPSHOT ...... SUCCESS [ 10.307 s] + [INFO] ------------------------------------------------------------------------ + [INFO] BUILD SUCCESS + [INFO] ------------------------------------------------------------------------ + [INFO] Total time: 03:43 min + [INFO] Finished at: 2018-09-03T11:56:01+01:00 + [INFO] ------------------------------------------------------------------------ + +.. container:: paragraph + + The build will have created all artifacts required for an APEX + installation. The following example show how to change to the target + directory and how it should look like. + ++----------------------------------------------------------------------------------------------------------------------------+ +| Unix, Cygwin | ++============================================================================================================================+ +| .. container:: | +| | +| .. container:: listingblock | +| | +| .. container:: content | +| | +| .. code:: bash | +| :number-lines: | +| | +| -rwxrwx---+ 1 esvevan Domain Users 772 Sep 3 11:55 apex-pdp-package-full_2.0.0~SNAPSHOT_all.changes* | +| -rwxrwx---+ 1 esvevan Domain Users 146328082 Sep 3 11:55 apex-pdp-package-full-2.0.0-SNAPSHOT.deb* | +| -rwxrwx---+ 1 esvevan Domain Users 15633 Sep 3 11:54 apex-pdp-package-full-2.0.0-SNAPSHOT.jar* | +| -rwxrwx---+ 1 esvevan Domain Users 146296819 Sep 3 11:55 apex-pdp-package-full-2.0.0-SNAPSHOT-tarball.tar.gz* | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 archive-tmp/ | +| -rwxrwx---+ 1 esvevan Domain Users 89 Sep 3 11:54 checkstyle-cachefile* | +| -rwxrwx---+ 1 esvevan Domain Users 10621 Sep 3 11:54 checkstyle-checker.xml* | +| -rwxrwx---+ 1 esvevan Domain Users 584 Sep 3 11:54 checkstyle-header.txt* | +| -rwxrwx---+ 1 esvevan Domain Users 86 Sep 3 11:54 checkstyle-result.xml* | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 classes/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 dependency-maven-plugin-markers/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 etc/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 examples/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:55 install_hierarchy/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 maven-archiver/ | ++----------------------------------------------------------------------------------------------------------------------------+ + ++--------------------------------------------------------------------------------------------------------+ +| Windows | ++========================================================================================================+ +| .. container:: | +| | +| .. container:: listingblock | +| | +| .. container:: content | +| | +| .. code:: bash | +| :number-lines: | +| | +| 03/09/2018 11:55 <DIR> . | +| 03/09/2018 11:55 <DIR> .. | +| 03/09/2018 11:55 146,296,819 apex-pdp-package-full-2.0.0-SNAPSHOT-tarball.tar.gz | +| 03/09/2018 11:55 146,328,082 apex-pdp-package-full-2.0.0-SNAPSHOT.deb | +| 03/09/2018 11:54 15,633 apex-pdp-package-full-2.0.0-SNAPSHOT.jar | +| 03/09/2018 11:55 772 apex-pdp-package-full_2.0.0~SNAPSHOT_all.changes | +| 03/09/2018 11:54 <DIR> archive-tmp | +| 03/09/2018 11:54 89 checkstyle-cachefile | +| 03/09/2018 11:54 10,621 checkstyle-checker.xml | +| 03/09/2018 11:54 584 checkstyle-header.txt | +| 03/09/2018 11:54 86 checkstyle-result.xml | +| 03/09/2018 11:54 <DIR> classes | +| 03/09/2018 11:54 <DIR> dependency-maven-plugin-markers | +| 03/09/2018 11:54 <DIR> etc | +| 03/09/2018 11:54 <DIR> examples | +| 03/09/2018 11:55 <DIR> install_hierarchy | +| 03/09/2018 11:54 <DIR> maven-archiver | +| 8 File(s) 292,652,686 bytes | +| 9 Dir(s) 14,138,720,256 bytes free | ++--------------------------------------------------------------------------------------------------------+ + +Install APEX +^^^^^^^^^^^^ + + .. container:: paragraph + + APEX can be installed in different ways: + + .. container:: ulist + + - Unix: automatically using ``rpm`` or ``dpkg`` from ``.rpm`` + or ``.deb`` archive + + - Windows, Unix, Cygwin: manually from a ``.tar.gz`` archive + + - Windows, Unix, Cygwin: build from source using Maven, then + install manually + +Install with RPM and DPKG +------------------------- + + .. container:: paragraph + + The install distributions of APEX automatically install the + system. The installation directory is + ``/opt/app/policy/apex-pdp``. Log files are located in + ``/var/log/onap/policy/apex-pdp``. The latest APEX version + will be available as ``/opt/app/policy/apex-pdp/apex-pdp``. + + .. container:: paragraph + + For the installation, a new user ``apexuser`` and a new + group ``apexuser`` will be created. This user owns the + installation directories and the log file location. The user + is also used by the standard APEX start scripts to run APEX + with this user’s permissions. + + +-----------------------------------------------------------------------+ + | RPM Installation | + +=======================================================================+ + | .. container:: | + | | + | .. container:: listingblock | + | | + | .. container:: content | + | | + | .. code:: bash | + | :number-lines: | + | | + | # sudo rpm -i apex-pdp-package-full-2.0.0-SNAPSHOT.rpm | + | ********************preinst******************* | + | arguments 1 | + | ********************************************** | + | creating group apexuser . . . | + | creating user apexuser . . . | + | ********************postinst**************** | + | arguments 1 | + | *********************************************** | + +-----------------------------------------------------------------------+ + ++--------------------------------------------------------------------------------------+ +| DPKG Installation | ++======================================================================================+ +| .. container:: | +| | +| .. container:: listingblock | +| | +| .. container:: content | +| | +| .. code:: bash | +| :number-lines: | +| | +| # sudo dpkg -i apex-pdp-package-full-2.0.0-SNAPSHOT.deb | +| Selecting previously unselected package apex-uservice. | +| (Reading database ... 288458 files and directories currently installed.) | +| Preparing to unpack apex-pdp-package-full-2.0.0-SNAPSHOT.deb ... | +| ********************preinst******************* | +| arguments install | +| ********************************************** | +| creating group apexuser . . . | +| creating user apexuser . . . | +| Unpacking apex-uservice (2.0.0-SNAPSHOT) ... | +| Setting up apex-uservice (2.0.0-SNAPSHOT) ... | +| ********************postinst**************** | +| arguments configure | +| *********************************************** | ++--------------------------------------------------------------------------------------+ + +.. container:: paragraph + + Once the installation is finished, APEX is fully installed and ready + to run. + +Install Manually from Archive (Unix, Cygwin) +-------------------------------------------- + + .. container:: paragraph + + Download a ``tar.gz`` archive. Create a directory where APEX + should be installed. Extract the ``tar`` archive. The following + example shows how to install APEX in ``/opt/apex`` and create a + link to ``/opt/apex/apex`` for the most recent installation. + + .. container:: listingblock + + .. container:: content + + .. code:: bash + :number-lines: + + # cd /opt + # mkdir apex + # cd apex + # mkdir apex-full-2.0.0-SNAPSHOT + # tar xvfz ~/Downloads/apex-pdp-package-full-2.0.0-SNAPSHOT.tar.gz -C apex-full-2.0.0-SNAPSHOT + # ln -s apex apex-pdp-package-full-2.0.0-SNAPSHOT + +Install Manually from Archive (Windows, 7Zip, GUI) +-------------------------------------------------- + + .. container:: paragraph + + Download a ``tar.gz`` archive and copy the file into the install + folder (in this example ``C:\apex``). Assuming you are using 7Zip, + right click on the file and extract the ``tar`` archive. Note: the + screenshots might show an older version than you have. + + .. container:: imageblock + + .. container:: content + + |Extract the TAR archive| + + .. container:: paragraph + + The right-click on the new created TAR file and extract the actual + APEX distribution. + + .. container:: imageblock + + .. container:: content + + |Extract the APEX distribution| + + .. container:: paragraph + + Inside the new APEX folder you see the main directories: ``bin``, + ``etc``, ``examples``, ``lib``, and ``war`` + + .. container:: paragraph + + Once extracted, please rename the created folder to + ``apex-full-2.0.0-SNAPSHOT``. This will keep the directory name in + line with the rest of this documentation. + +Install Manually from Archive (Windows, 7Zip, CMD) +-------------------------------------------------- + + .. container:: paragraph + + Download a ``tar.gz`` archive and copy the file into the install + folder (in this example ``C:\apex``). Start ``cmd``, for instance + typing ``Windows+R`` and then ``cmd`` in the dialog. Assuming + ``7Zip`` is installed in the standard folder, simply run the + following commands (for APEX version 2.0.0-SNAPSHOT full + distribution) + + .. container:: listingblock + + .. container:: content + + .. code:: bash + :number-lines: + + >c: + >cd \apex + >"\Program Files\7-Zip\7z.exe" x apex-pdp-package-full-2.0.0-SNAPSHOT.tar.gz -so | "\Program Files\7-Zip\7z.exe" x -aoa -si -ttar -o"apex-full-2.0.0-SNAPSHOT" + +.. container:: paragraph + + APEX is now installed in the folder + ``C:\apex\apex-full-2.0.0-SNAPSHOT``. + +Build from Source +^^^^^^^^^^^^^^^^^ + +Build and Install Manually (Unix, Windows, Cygwin) +-------------------------------------------------- + + .. container:: paragraph + + Clone the APEX GIT repositories into a directory. Go to that + directory. Use Maven to build APEX (all details on building + APEX from source can be found in *APEX HowTo: Build*). + Install from the created artifacts (``rpm``, ``deb``, + ``tar.gz``, or copying manually). + + .. important:: + Building RPM distributions + RPM images are only build if the ``rpm`` package is installed (Unix). To install ``rpm`` run ``sudo apt-get install rpm``, + then build APEX. + + .. container:: paragraph + + The following example shows how to build the APEX system, + without tests (``-DskipTests``) to safe some time. It + assumes that the APX GIT repositories are cloned to: + + .. container:: ulist + + - Unix, Cygwin: ``/usr/local/src/apex`` + + - Windows: ``C:\dev\apex`` + + +-------------------------------------------------------+--------------------------------------------------------+ + | Unix, Cygwin | Windows | + +=======================================================+========================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: bash | .. code:: bash | + | :number-lines: | :number-lines: | + | | | + | >c: | # cd /usr/local/src/apex | + | >cd \dev\apex | # mvn clean install -DskipTests | + | >mvn clean install -DskipTests | | + +-------------------------------------------------------+--------------------------------------------------------+ + +.. container:: paragraph + + The build takes about 2 minutes without test and about 4-5 minutes + with tests on a standard development laptop. It should run through + without errors, but with a lot of messages from the build process. If + build with tests (i.e. without ``-DskipTests``), there will be error + messages and stack trace prints from some tests. This is normal, as + long as the build finishes successful. + +.. container:: paragraph + + When Maven is finished with the build, the final screen should look + similar to this (omitting some ``success`` lines): + +.. container:: listingblock + + .. container:: content + + .. code:: bash + :number-lines: + + [INFO] tools .............................................. SUCCESS [ 0.248 s] + [INFO] tools-common ....................................... SUCCESS [ 0.784 s] + [INFO] simple-wsclient .................................... SUCCESS [ 3.303 s] + [INFO] model-generator .................................... SUCCESS [ 0.644 s] + [INFO] packages ........................................... SUCCESS [ 0.336 s] + [INFO] apex-pdp-package-full .............................. SUCCESS [01:10 min] + [INFO] Policy APEX PDP - Docker build 2.0.0-SNAPSHOT ...... SUCCESS [ 10.307 s] + [INFO] ------------------------------------------------------------------------ + [INFO] BUILD SUCCESS + [INFO] ------------------------------------------------------------------------ + [INFO] Total time: 03:43 min + [INFO] Finished at: 2018-09-03T11:56:01+01:00 + [INFO] ------------------------------------------------------------------------ + +.. container:: paragraph + + The build will have created all artifacts required for an APEX + installation. The following example show how to change to the target + directory and how it should look like. + ++-----------------------------------------------------------------------------------------------------------------------------+ +| Unix, Cygwin | ++=============================================================================================================================+ +| .. container:: | +| | +| .. container:: listingblock | +| | +| .. code:: bash | +| :number-lines: | +| | +| # cd packages/apex-pdp-package-full/target | +| # ls -l | +| -rwxrwx---+ 1 esvevan Domain Users 772 Sep 3 11:55 apex-pdp-package-full_2.0.0~SNAPSHOT_all.changes* | +| -rwxrwx---+ 1 esvevan Domain Users 146328082 Sep 3 11:55 apex-pdp-package-full-2.0.0-SNAPSHOT.deb* | +| -rwxrwx---+ 1 esvevan Domain Users 15633 Sep 3 11:54 apex-pdp-package-full-2.0.0-SNAPSHOT.jar* | +| -rwxrwx---+ 1 esvevan Domain Users 146296819 Sep 3 11:55 apex-pdp-package-full-2.0.0-SNAPSHOT-tarball.tar.gz* | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 archive-tmp/ | +| -rwxrwx---+ 1 esvevan Domain Users 89 Sep 3 11:54 checkstyle-cachefile* | +| -rwxrwx---+ 1 esvevan Domain Users 10621 Sep 3 11:54 checkstyle-checker.xml* | +| -rwxrwx---+ 1 esvevan Domain Users 584 Sep 3 11:54 checkstyle-header.txt* | +| -rwxrwx---+ 1 esvevan Domain Users 86 Sep 3 11:54 checkstyle-result.xml* | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 classes/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 dependency-maven-plugin-markers/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 etc/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 examples/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:55 install_hierarchy/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 maven-archiver/ | ++-----------------------------------------------------------------------------------------------------------------------------+ + ++-----------------------------------------------------------------------------------------------------------------------------+ +| Windows | ++=============================================================================================================================+ +| .. container:: | +| | +| .. container:: listingblock | +| | +| .. code:: bash | +| :number-lines: | +| | +| >cd packages\apex-pdp-package-full\target | +| >dir | +| 03/09/2018 11:55 <DIR> . | +| 03/09/2018 11:55 <DIR> .. | +| 03/09/2018 11:55 146,296,819 apex-pdp-package-full-2.0.0-SNAPSHOT-tarball.tar.gz | +| 03/09/2018 11:55 146,328,082 apex-pdp-package-full-2.0.0-SNAPSHOT.deb | +| 03/09/2018 11:54 15,633 apex-pdp-package-full-2.0.0-SNAPSHOT.jar | +| 03/09/2018 11:55 772 apex-pdp-package-full_2.0.0~SNAPSHOT_all.changes | +| 03/09/2018 11:54 <DIR> archive-tmp | +| 03/09/2018 11:54 89 checkstyle-cachefile | +| 03/09/2018 11:54 10,621 checkstyle-checker.xml | +| 03/09/2018 11:54 584 checkstyle-header.txt | +| 03/09/2018 11:54 86 checkstyle-result.xml | +| 03/09/2018 11:54 <DIR> classes | +| 03/09/2018 11:54 <DIR> dependency-maven-plugin-markers | +| 03/09/2018 11:54 <DIR> etc | +| 03/09/2018 11:54 <DIR> examples | +| 03/09/2018 11:55 <DIR> install_hierarchy | +| 03/09/2018 11:54 <DIR> maven-archiver | +| 8 File(s) 292,652,686 bytes | +| 9 Dir(s) 14,138,720,256 bytes free | ++-----------------------------------------------------------------------------------------------------------------------------+ + +.. container:: paragraph + + Now, take the ``.deb`` or the ``.tar.gz`` file and install APEX. + Alternatively, copy the content of the folder ``install_hierarchy`` + to your APEX directory. + +Installation Layout +^^^^^^^^^^^^^^^^^^^ + + .. container:: paragraph + + A full installation of APEX comes with the following layout. + + .. container:: listingblock + + .. container:: content + + :: + + $APEX_HOME + ├───bin (1) + ├───etc (2) + │ ├───editor + │ ├───hazelcast + │ ├───infinispan + │ └───META-INF + ├───examples (3) + │ ├───config (4) + │ ├───docker (5) + │ ├───events (6) + │ ├───html (7) + │ ├───models (8) + │ └───scripts (9) + ├───lib (10) + │ └───applications (11) + └───war (12) + + .. container:: colist arabic + + +-----------------------------------+-----------------------------------+ + | **1** | binaries, mainly scripts (bash | + | | and bat) to start the APEX engine | + | | and applications | + +-----------------------------------+-----------------------------------+ + | **2** | configuration files, such as | + | | logback (logging) and third party | + | | library configurations | + +-----------------------------------+-----------------------------------+ + | **3** | example policy models to get | + | | started | + +-----------------------------------+-----------------------------------+ + | **4** | configurations for the examples | + | | (with sub directories for | + | | individual examples) | + +-----------------------------------+-----------------------------------+ + | **5** | Docker files and additional | + | | Docker instructions for the | + | | exampples | + +-----------------------------------+-----------------------------------+ + | **6** | example events for the examples | + | | (with sub directories for | + | | individual examples) | + +-----------------------------------+-----------------------------------+ + | **7** | HTML files for some examples, | + | | e.g. the Decisionmaker example | + +-----------------------------------+-----------------------------------+ + | **8** | the policy models, generated for | + | | each example (with sub | + | | directories for individual | + | | examples) | + +-----------------------------------+-----------------------------------+ + | **9** | additional scripts for the | + | | examples (with sub directories | + | | for individual examples) | + +-----------------------------------+-----------------------------------+ + | **10** | the library folder with all Java | + | | JAR files | + +-----------------------------------+-----------------------------------+ + | **11** | applications, also known as jar | + | | with dependencies (or fat jars), | + | | individually deployable | + +-----------------------------------+-----------------------------------+ + | **12** | WAR files for web applications | + +-----------------------------------+-----------------------------------+ + +System Configuration +^^^^^^^^^^^^^^^^^^^^ + + .. container:: paragraph + + Once APEX is installed, a few configurations need to be done: + + .. container:: ulist + + - Create an APEX user and an APEX group (optional, if not + installed using RPM and DPKG) + + - Create environment settings for ``APEX_HOME`` and + ``APEX_USER``, required by the start scripts + + - Change settings of the logging framework (optional) + + - Create directories for logging, required (execution might + fail if directories do not exist or cannot be created) + +APEX User and Group +------------------- + + .. container:: paragraph + + On smaller installations and test systems, APEX can run as + any user or group. + + .. container:: paragraph + + However, if APEX is installed in production, we strongly + recommend you set up a dedicated user for running APEX. This + will isolate the execution of APEX to that user. We + recommend you use the userid ``apexuser`` but you may use + any user you choose. + + .. container:: paragraph + + The following example, for UNIX, creates a group called + ``apexuser``, an APEX user called ``apexuser``, adds the + group to the user, and changes ownership of the APEX + installation to the user. Substitute ``<apex-dir>`` with the + directory where APEX is installed. + + .. container:: listingblock + + .. container:: content + + .. code:: bash + :number-lines: + + # sudo groupadd apexuser + # sudo useradd -g apexuser apexuser + # sudo chown -R apexuser:apexuser <apex-dir> + +.. container:: paragraph + + For other operating systems please consult your manual or system + administrator. + +Environment Settings: APEX_HOME and APEX_USER +--------------------------------------------- + + .. container:: paragraph + + The provided start scripts for APEX require two environment + variables being set: + + .. container:: ulist + + - ``APEX_USER`` with the user under whos name and permission APEX + should be started (Unix only) + + - ``APEX_HOME`` with the directory where APEX is installed (Unix, + Windows, Cygwin) + + .. container:: paragraph + + The first row in the following table shows how to set these + environment variables temporary (assuming the user is + ``apexuser``). The second row shows how to verify the settings. + The last row explains how to set those variables permanently. + + +------------------------------------------------+---------------------------------------------------------+ + | Unix, Cygwin (bash/tcsh) | Windows | + +================================================+=========================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: bash | .. code:: bash | + | :number-lines: | :number-lines: | + | | | + | # export APEX_USER=apexuser | >set APEX_HOME=C:\apex\apex-full-2.0.0-SNAPSHOT | + | # cd /opt/app/policy/apex-pdp | | + | # export APEX_HOME=`pwd` | | + | | | + +------------------------------------------------+ | + | .. container:: | | + | | | + | .. container:: content | | + | | | + | .. code:: tcsh | | + | :number-lines: | | + | | | + | # setenv APEX_USER apexuser | | + | # cd /opt/app/policy/apex-pdp | | + | # setenv APEX_HOME `pwd` | | + | | | + +------------------------------------------------+---------------------------------------------------------+ + | .. container:: | .. container:: | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: bash | .. code:: bash | + | :number-lines: | :number-lines: | + | | | + | # env | grep APEX | >set APEX_HOME | + | # APEX_USER=apexuser | APEX_HOME=\apex\apex-full-2.0.0-SNAPSHOT | + | # APEX_HOME=/opt/app/policy/apex-pdp | | + | | | + +------------------------------------------------+---------------------------------------------------------+ + + +Making Environment Settings Permanent (Unix, Cygwin) +#################################################### + + .. container:: paragraph + + For a per-user setting, edit the a user’s ``bash`` or ``tcsh`` + settings in ``~/.bashrc`` or ``~/.tcshrc``. For system-wide + settings, edit ``/etc/profiles`` (requires permissions). + + +Making Environment Settings Permanent (Windows) +############################################### + + .. container:: paragraph + + On Windows 7 do + + .. container:: ulist + + - Click on the **Start** Menu + + - Right click on **Computer** + + - Select **Properties** + + .. container:: paragraph + + On Windows 8/10 do + + .. container:: ulist + + - Click on the **Start** Menu + + - Select **System** + + .. container:: paragraph + + Then do the following + + .. container:: ulist + + - Select **Advanced System Settings** + + - On the **Advanced** tab, click the **Environment Variables** + button + + - Edit an existing variable, or create a new System variable: + 'Variable name'="APEX_HOME", 'Variable + value'="C:\apex\apex-full-2.0.0-SNAPSHOT" + + .. container:: paragraph + + For the settings to take effect, an application needs to be + restarted (e.g. any open ``cmd`` window). + +Edit the APEX Logging Settings +------------------------------ + + .. container:: paragraph + + Configure the APEX logging settings to your requirements, for + instance: + + .. container:: ulist + + - change the directory where logs are written to, or + + - change the log levels + + .. container:: paragraph + + Edit the file ``$APEX_HOME/etc/logback.xml`` for any required + changes. To change the log directory change the line + + .. container:: paragraph + + ``<property name="VAR_LOG" value="/var/log/onap/policy/apex-pdp/" />`` + + .. container:: paragraph + + to + + .. container:: paragraph + + ``<property name="VAR_LOG" value="/PATH/TO/LOG/DIRECTORY/" />`` + + .. container:: paragraph + + On Windows, it is recommended to change the log directory to: + + .. container:: paragraph + + ``<property name="VAR_LOG" value="C:/apex/apex-full-2.0.0-SNAPSHOT/logs" />`` + + .. container:: paragraph + + Note: Be careful about when to use ``\`` vs. ``/`` as the path + separator! + +Create Directories for Logging +------------------------------ + + .. container:: paragraph + + Make sure that the log directory exists. This is important when + APEX was installed manually or when the log directory was changed + in the settings (see above). + + +------------------------------------------------------------------+-------------------------------------------------------+ + | Unix, Cygwin | Windows | + +==================================================================+=======================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: bash | .. code:: bash | + | :number-lines: | :number-lines: | + | | | + | mkdir -p /var/log/onap/policy/apex-pdp | >mkdir C:\apex\apex-full-2.0.0-SNAPSHOT\logs | + | chown -R apexuser:apexuser /var/log/onap/policy/apex-pdp | | + +------------------------------------------------------------------+-------------------------------------------------------+ + +Verify the APEX Installation +############################ + + .. container:: sectionbody + + .. container:: paragraph + + When APEX is installed and all settings are realized, the + installation can be verified. + +Verify Installation - run Engine +-------------------------------- + + .. container:: paragraph + + A simple verification of an APEX installation can be done by + simply starting the APEX engine without any configuration. + On Unix (or Cygwin) start the engine using + ``$APEX_HOME/bin/apexEngine.sh``. On Windows start the + engine using ``%APEX_HOME%\bin\apexEngine.bat``. The engine + will fail to fully start. However, if the output looks + similar to the following line, the APEX installation is + realized. + + .. container:: listingblock + + .. container:: content + + .. code:: bash + :number-lines: + + Starting Apex service with parameters [] . . . + start of Apex service failed: Apex configuration file was not specified as an argument + 2018-09-03 13:11:33,914 Apex [main] ERROR o.o.p.a.service.engine.main.ApexMain - start of Apex service failed + org.onap.policy.apex.model.basicmodel.concepts.ApexException: Apex configuration file was not specified as an argument + at org.onap.policy.apex.service.engine.main.ApexCommandLineArguments.validateReadableFile(ApexCommandLineArguments.java:267) + at org.onap.policy.apex.service.engine.main.ApexCommandLineArguments.validate(ApexCommandLineArguments.java:161) + at org.onap.policy.apex.service.engine.main.ApexMain.<init>(ApexMain.java:68) + at org.onap.policy.apex.service.engine.main.ApexMain.main(ApexMain.java:165) + usage: org.onap.policy.apex.service.engine.main.ApexMain [options...] + options + -c,--config-file <CONFIG_FILE>the full path to the configuration file to use, the configuration file must be a Json file + containing the Apex configuration parameters + -h,--help outputs the usage of this command + -m,--model-file <MODEL_FILE> the full path to the model file to use, if set it overrides the model file set in the + configuration file + -v,--version outputs the version of Apex + +Verify Installation - run an Example +------------------------------------ + + .. container:: paragraph + + A full APEX installation comes with several examples. Here, we can + fully verify the installation by running one of the examples. + + .. container:: paragraph + + We use the example called *SampleDomain* and configure the engine + to use standard in and standard out for events. Run the engine + with the provided configuration. Note: Cygwin executes scripts as + Unix scripts but runs Java as a Windows application, thus the + configuration file must be given as a Windows path. + + .. container:: listingblock + + .. container:: content + + .. code:: bash + :number-lines: + + # $APEX_HOME/bin/apexEngine.sh -c $APEX_HOME/examples/config/SampleDomain/Stdin2StdoutJsonEventJava.json (1) + # $APEX_HOME/bin/apexEngine.sh -c C:/apex/apex-full-2.0.0-SNAPSHOT/examples/config/SampleDomain/Stdin2StdoutJsonEventJava.json (2) + >%APEX_HOME%\bin\apexEngine.bat -c %APEX_HOME%\examples\config\SampleDomain\Stdin2StdoutJsonEventJava.json :: (3) + +.. container:: colist arabic + + +-------+---------+ + | **1** | UNIX | + +-------+---------+ + | **2** | Cygwin | + +-------+---------+ + | **3** | Windows | + +-------+---------+ + +.. container:: paragraph + + The engine should start successfully. Assuming the logging levels are + not change (default level is ``info``), the output should look + similar to this (last few lines) + +.. container:: listingblock + + .. container:: content + + .. code:: bash + :number-lines: + + Starting Apex service with parameters [-c, v:/dev/ericsson/apex/onap/apex-pdp/packages/apex-pdp-package-full/target/install_hierarchy/examples/config/SampleDomain/Stdin2StdoutJsonEventJava.json] . . . + 2018-09-05 15:16:42,800 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Created apex engine MyApexEngine-0:0.0.1 . + 2018-09-05 15:16:42,804 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Created apex engine MyApexEngine-1:0.0.1 . + 2018-09-05 15:16:42,804 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Created apex engine MyApexEngine-2:0.0.1 . + 2018-09-05 15:16:42,805 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Created apex engine MyApexEngine-3:0.0.1 . + 2018-09-05 15:16:42,805 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - APEX service created. + 2018-09-05 15:16:43,962 Apex [main] INFO o.o.p.a.s.e.e.EngDepMessagingService - engine<-->deployment messaging starting . . . + 2018-09-05 15:16:43,963 Apex [main] INFO o.o.p.a.s.e.e.EngDepMessagingService - engine<-->deployment messaging started + 2018-09-05 15:16:44,987 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Registering apex model on engine MyApexEngine-0:0.0.1 + 2018-09-05 15:16:45,112 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Registering apex model on engine MyApexEngine-1:0.0.1 + 2018-09-05 15:16:45,113 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Registering apex model on engine MyApexEngine-2:0.0.1 + 2018-09-05 15:16:45,113 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Registering apex model on engine MyApexEngine-3:0.0.1 + 2018-09-05 15:16:45,120 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Added the action listener to the engine + Started Apex service + +.. container:: paragraph + + Important are the last two line, stating that APEX has added the + final action listener to the engine and that the engine is started. + +.. container:: paragraph + + The engine is configured to read events from standard input and write + produced events to standard output. The policy model is a very simple + policy. + +.. container:: paragraph + + The following table shows an input event in the left column and an + output event in the right column. Past the input event into the + console where APEX is running, and the output event should appear in + the console. Pasting the input event multiple times will produce + output events with different values. + ++-------------------------------------------------------------+-------------------------------------------------------------+ +| Input Event | Example Output Event | ++=============================================================+=============================================================+ +| .. container:: | .. container:: | +| | | +| .. container:: content | .. container:: content | +| | | +| .. code:: bash | .. code:: bash | +| :number-lines: | :number-lines: | +| | | +| { | { | +| "nameSpace": "org.onap.policy.apex.sample.events", | "name": "Event0004", | +| "name": "Event0000", | "version": "0.0.1", | +| "version": "0.0.1", | "nameSpace": "org.onap.policy.apex.sample.events", | +| "source": "test", | "source": "Act", | +| "target": "apex", | "target": "Outside", | +| "TestSlogan": "Test slogan for External Event0", | "TestActCaseSelected": 2, | +| "TestMatchCase": 0, | "TestActStateTime": 1536157104627, | +| "TestTimestamp": 1469781869269, | "TestDecideCaseSelected": 0, | +| "TestTemperature": 9080.866 | "TestDecideStateTime": 1536157104625, | +| } | "TestEstablishCaseSelected": 0, | +| | "TestEstablishStateTime": 1536157104623, | +| | "TestMatchCase": 0, | +| | "TestMatchCaseSelected": 1, | +| | "TestMatchStateTime": 1536157104620, | +| | "TestSlogan": "Test slogan for External Event0", | +| | "TestTemperature": 9080.866, | +| | "TestTimestamp": 1469781869269 | +| | } | ++-------------------------------------------------------------+-------------------------------------------------------------+ + +.. container:: paragraph + + Terminate APEX by simply using ``CTRL+C`` in the console. + +Verify a Full Installation - REST Editor +---------------------------------------- + + .. container:: paragraph + + APEX has a REST application for viewing policy models. The + application can also be used to create new policy models close to + the engine native policy language. Start the REST editor as + follows. + + .. container:: listingblock + + .. container:: content + + .. code:: bash + :number-lines: + + # $APEX_HOME/bin/apexApps.sh rest-editor + +.. container:: listingblock + + .. container:: content + + .. code:: bash + :number-lines: + + >%APEX_HOME%\bin\apexApps.bat rest-editor + +.. container:: paragraph + + The script will start a simple web server + (`Grizzly <https://javaee.github.io/grizzly/>`__) and deploy a + ``war`` web archive in it. Once the editor is started, it will be + available on ``localhost:18989``. The last few line of the messages + should be: + +.. container:: listingblock + + .. container:: content + + .. code:: bash + :number-lines: + + Apex Editor REST endpoint (ApexEditorMain: Config=[ApexEditorParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=READY) starting at http://localhost:18989/apexservices/ . . . + Sep 05, 2018 10:35:57 PM org.glassfish.grizzly.http.server.NetworkListener start + INFO: Started listener bound to [localhost:18989] + Sep 05, 2018 10:35:57 PM org.glassfish.grizzly.http.server.HttpServer start + INFO: [HttpServer] Started. + Apex Editor REST endpoint (ApexEditorMain: Config=[ApexEditorParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=RUNNING) started at http://localhost:18989/apexservices/ + +.. container:: paragraph + + Now open a browser (Firefox, Chrome, Opera, Internet Explorer) and + use the URL ``http://localhost:18989/``. This will connect the + browser to the started REST editor. The start screen should be as + follows. + +.. container:: imageblock + + .. container:: content + + |REST Editor Start Screen| + + .. container:: title + + Figure 1. REST Editor Start Screen + +.. container:: paragraph + + Now load a policy model by clicking the menu ``File`` and then + ``Open``. In the opened dialog, go to the directory where APEX is + installed, then ``examples``, ``models``, ``SampleDomain``, and there + select the file ``SamplePolicyModelJAVA.json``. This will load the + policy model used to verify the policy engine (see above). Once + loaded, the screen should look as follows. + +.. container:: imageblock + + .. container:: content + + |REST Editor with loaded SampleDomain Policy Model| + + .. container:: title + + Figure 2. REST Editor with loaded SampleDomain Policy Model + +.. container:: paragraph + + Now you can use the REST editor. To finish this verification, simply + terminate your browser (or the tab), and then use ``CTRL+C`` in the + console where you started the REST editor. + +Installing WAR Applications +^^^^^^^^^^^^^^^^^^^^^^^^^^^ + + .. container:: sectionbody + + .. container:: paragraph + + APEX comes with a set of WAR files. These are complete + applications that can be installed and run in an application + server. All of these applications are realized as servlets. You + can find the WAR applications in ``$APEX_HOME/war`` (UNIX, + Cygwin) or ``%APEX_HOME%\war`` (Windows). + + .. container:: paragraph + + Installing and using the WAR applications requires a web server + that can execute ``war`` web archives. We recommend to use + `Apache Tomcat <https://tomcat.apache.org/>`__, however other + web servers can be used as well. + + .. container:: paragraph + + Install Apache Tomcat including the ``Manager App``, see `V9.0 + Docs <https://tomcat.apache.org/tomcat-9.0-doc/manager-howto.html#Configuring_Manager_Application_Access>`__ + for details. Start the Tomcat service, or make sure that Tomcat + is running. + + .. container:: paragraph + + There are multiple ways to install the APEX WAR applications: + + .. container:: ulist + + - copy the ``.war`` file into the Tomcat ``webapps`` folder + + - use the Tomcat ``Manager App`` to deploy via the web + interface + + - deploy using a REST call to Tomcat + + .. container:: paragraph + + For details on how to install ``war`` files please consult the + `Tomcat + Documentation <https://tomcat.apache.org/tomcat-9.0-doc/index.html>`__ + or the `Manager App + HOW-TO <https://tomcat.apache.org/tomcat-9.0-doc/manager-howto.html>`__. + Once you installed an APEX WAR application (and wait for + sufficient time for Tomcat to finalize the installation), open + the ``Manager App`` in Tomcat. You should see the APEX WAR + application being installed and running. + + .. container:: paragraph + + In case of errors, examine the log files in the Tomcat log + directory. In a conventional install, those log files are in + the logs directory where Tomcat is installed. + + .. container:: paragraph + + The current APEX version provides the following WAR + applications: + + .. container:: ulist + + - client-deployment-2.0.0-SNAPSHOT.war - a client to deploy + new policy models to a running engine + + - client-editor-2.0.0-SNAPSHOT.war - the standard policy REST + editor GUI + + - client-monitoring-2.0.0-SNAPSHOT.war - a client for + monitoring a running APEX engine + + - client-full-2.0.0-SNAPSHOT.war - a full client with a + one-stop-access to deployment, monitoring, and REST editor + + - examples-servlet-2.0.0-SNAPSHOT.war - an example APEX + servlet + +Running APEX in Docker +^^^^^^^^^^^^^^^^^^^^^^ + + .. container:: sectionbody + + .. container:: paragraph + + Since APEX is in ONAP, we provide a full virtualization + environment for the engine. + +Run in ONAP +----------- + + .. container:: paragraph + + Running APEX from the ONAP docker repository only requires 2 + commands: + + .. container:: olist arabic + + #. Log into the ONAP docker repo + + .. container:: listingblock + + .. container:: content + + :: + + docker login -u docker -p docker nexus3.onap.org:10003 + + .. container:: olist arabic + + #. Run the APEX docker image + + .. container:: listingblock + + .. container:: content + + :: + + docker run -it --rm nexus3.onap.org:10003/onap/policy-apex-pdp:latest + + +Build a Docker Image +-------------------- + + .. container:: paragraph + + Alternatively, one can use the Dockerfile defined in the + Docker package to build an image. + + .. container:: listingblock + + .. container:: title + + APEX Dockerfile + + .. container:: content + + .. code:: bash + :number-lines: + + # + # Docker file to build an image that runs APEX on Java 8 in Ubuntu + # + FROM ubuntu:16.04 + + RUN apt-get update && \ + apt-get upgrade -y && \ + apt-get install -y software-properties-common && \ + add-apt-repository ppa:openjdk-r/ppa -y && \ + apt-get update && \ + apt-get install -y openjdk-8-jdk + + # Create apex user and group + RUN groupadd apexuser + RUN useradd --create-home -g apexuser apexuser + + # Add Apex-specific directories and set ownership as the Apex admin user + RUN mkdir -p /opt/app/policy/apex-pdp + RUN mkdir -p /var/log/onap/policy/apex-pdp + RUN chown -R apexuser:apexuser /var/log/onap/policy/apex-pdp + + # Unpack the tarball + RUN mkdir /packages + COPY apex-pdp-package-full.tar.gz /packages + RUN tar xvfz /packages/apex-pdp-package-full.tar.gz --directory /opt/app/policy/apex-pdp + RUN rm /packages/apex-pdp-package-full.tar.gz + + # Ensure everything has the correct permissions + RUN find /opt/app -type d -perm 755 + RUN find /opt/app -type f -perm 644 + RUN chmod a+x /opt/app/policy/apex-pdp/bin/* + + # Copy examples to Apex user area + RUN cp -pr /opt/app/policy/apex-pdp/examples /home/apexuser + + RUN apt-get clean + + RUN chown -R apexuser:apexuser /home/apexuser/* + + USER apexuser + ENV PATH /opt/app/policy/apex-pdp/bin:$PATH + WORKDIR /home/apexuser + +.. container:: + :name: footer + + .. container:: + :name: footer-text + + 2.0.0-SNAPSHOT + Last updated 2018-09-10 15:38:16 IST + +.. |Extract the TAR archive| image:: images/install-guide/win-extract-tar-gz.png +.. |Extract the APEX distribution| image:: images/install-guide/win-extract-tar.png +.. |REST Editor Start Screen| image:: images/install-guide/rest-start.png +.. |REST Editor with loaded SampleDomain Policy Model| image:: images/install-guide/rest-loaded.png + diff --git a/docs/apex/APEX-Introduction.rst b/docs/apex/APEX-Introduction.rst new file mode 100644 index 00000000..90dd9e74 --- /dev/null +++ b/docs/apex/APEX-Introduction.rst @@ -0,0 +1,545 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 + + +A short Introduction to APEX +***************************** + +.. contents:: + :depth: 3 + +Introduction to APEX +^^^^^^^^^^^^^^^^^^^^ + + .. container:: sectionbody + + .. container:: paragraph + + APEX stand for Adaptive Policy EXecution. It is a + lightweight engine for execution of policies. APEX allows + you to specify logic as a policy, logic that you can adapt + on the fly as your system executes. The APEX policies you + design can be really simple, with a single snippet of logic, + or can be very complex, with many states and tasks. APEX + policies can even be designed to self-adapt at execution + time, the choice is yours! + + .. container:: imageblock + + .. container:: content + + |Simple APEX Overview| + + .. container:: title + + Figure 1. Simple APEX Overview + + .. container:: paragraph + + The Adaptive Policy Engine in APEX runs your policies. These + policies are triggered by incoming events. The logic of the + policies executes and produces a response event. The + *Incoming Context* on the incoming event and the *Outgoing + Context* on the outgoing event are simply the fields and + attributes of the event. You design the policies that APEX + executes and the trigger and action events that your + policies accept and produce. Events are fed in and sent out + as JSON or XML events over Kafka, a Websocket, a file or + named pipe, or even standard input. If you run APEX as a + library in your application, you can even feed and receive + events over a Java API. + + .. container:: imageblock + + .. container:: content + + |APEX States and Context| + + .. container:: title + + Figure 2. APEX States and Context + + .. container:: paragraph + + You design your policy as a chain of states, with each state + being fed by the state before. The simplest policy can have + just one state. We provide specific support for the + four-state `MEDA (Match Establish Decide + Act) <https://www.researchgate.net/publication/303564082_Apex_An_Engine_for_Dynamic_Adaptive_Policy_Execution>`__ + policy state model and the three-state `ECA (Event Condition + Action) <https://en.wikipedia.org/wiki/Event_condition_action>`__ + policy state model. APEX is fully distributed. You can + decide how many APEX engine instances to run for your + application and on which real or virtual hosts to run them. + + .. container:: paragraph + + In APEX, you also have control of the *Context* used by your + policies. Context is simply the state information and data + used by your policies. You define what context your policies + use and what the scope of that context is. *Policy Context* + is private to a particular policy and is accessible only to + whatever APEX engines are running that particular policy. + *Global Context* is available to all policies. *External + Context* is read-only context such as weather or topology + information that is provided by other systems. APEX keeps + context coordinated across all the the instances running a + particular policy. If a policy running in an APEX engine + changes the value of a piece of context, that value is is + available to all other APEX engines that use that piece of + context. APEX takes care of distribution, locking, writing + of context to persistent storage, and monitoring of context. + + .. container:: imageblock + + .. container:: content + + |The APEX Eco-System| + + .. container:: title + + Figure 3. The APEX Eco-System + + .. container:: paragraph + + The APEX engine (AP-EN) is available as a Java library for + inclusion in your application, as a microservice running in + a Docker container, or as a stand-alone service available + for integration into your system. APEX also includes a + policy editor (AP-AUTH) that allows you to design your + policies and a web-based policy management console you use + to deploy policies and to keep track of the state of + policies and context in policies. Context handling (AP-CTX) + is integrated into the APEX engine and policy deployment + (AP-DEP) is provided as a servlet running under a web + framework such as `Apache + Tomcat <http://tomcat.apache.org/>`__. + +APEX Configuration +^^^^^^^^^^^^^^^^^^ + + .. container:: sectionbody + + .. container:: paragraph + + An APEX engine can be configured to use various combinations + of event input handlers, event output handlers, event + protocols, context handlers, and logic executors. The system + is build using a plugin architecture. Each configuration + option is realized by a plugin, which can be loaded and + configured when the engine is started. New plugins can be + added to the system at any time, though to benefit from a + new plugin an engine will need to be restarted. + + .. container:: imageblock + + .. container:: content + + |APEX Configuration Matrix| + + .. container:: title + + Figure 4. APEX Configuration Matrix + + .. container:: paragraph + + The APEX distribution already comes with a number of + plugins. The figure above shows the provided plugins. Any + combination of input, output, event protocol, context + handlers, and executors is possible. + +APEX Policy Matrix +^^^^^^^^^^^^^^^^^^ + + .. container:: sectionbody + + .. container:: paragraph + + APEX offers a lot of flexibility for defining, deploying, + and executing policies. Based on a theoretic model, it + supports virtually any policy model and allows to translate + legacy policies into the APEX execution format. However, the + most important aspect for using APEX is to decide what + policy is needed, what underlying policy concepts should be + used, and how the decision logic should be realized. Once + these aspects are decided, APEX can be used to execute the + policies. If the policy evolves, say from a simple decision + table to a fully adaptable policy, only the policy + definition requires change. APEX supports all of that. + + .. container:: paragraph + + The figure below shows a (non-exhaustive) matrix, which will + help to decide what policy is required to solve your + problem. Read the matrix from left to right choosing one + cell in each column. + + .. container:: imageblock + + .. container:: content + + |APEX Policy Matrix| + + .. container:: title + + Figure 5. APEX Policy Matrix + + .. container:: paragraph + + The policy can support one of a number of stimuli with an + associated purpose/model of the policy, for instance: + + .. container:: ulist + + - Configuration, i.e. what should happen. An example is an + event that states an intended network configuration and + the policy should provide the detailed actions for it. + The policy can be realized for instance as an obligation + policy, a promise or an intent. + + - Report, i.e. something did happen. An example is an event + about an error or fault and the policy needs to repair + that problem. The policy would usually be an obligation, + utility function, or goal policy. + + - Monitoring, i.e. something does happen. An example is a + notification about certain network conditions, to which + the policy might (or might not) react. The policy will + mitigate the monitored events or permit (deny) related + actions as an obligation or authorization. + + - Analysis, i.e. why did something happen. An example is an + analytic component sends insights of a situation + requiring a policy to act on it. The policy can solve the + problem, escalate it, or delegate it as a refrain or + delegation policy. + + - Prediction, i.e. what will happen next. An example are + events that a policy uses to predict a future network + condition. The policy can prevent or enforce the + prediction as an adaptive policy, a utility function, or + a goal. + + - Feedback, i.e. why did something happen or not happen. + Similar to analysis, but here the feedback will be in the + input event and the policy needs to something with that + information. Feedback can be related to history or + experience, for instance a previous policy execution. The + policy needs to be context-aware or be a meta-policy. + + .. container:: paragraph + + Once the purpose of the policy is decided, the next step is + to look into what context information the policy will + require to do its job. This can range from very simple to a + lot of different information, for instance: + + .. container:: ulist + + - No context, nothing but a trigger event, e.g. a string or + a number, is required + + - Event context, the incoming event provides all + information (more than a string or number) for the policy + + - Policy context (read only), the policy has access to + additional information related to its class but cannot + change/alter them + + - Policy context (read and write), the policy has access to + additional information related to its class and can alter + this information (for instance to record historic + information) + + - Global context (read only), the policy has access to + additional information of any kind but cannot + change/alter them + + - Global context (read and write), the policy the policy + has access to additional information of any kind and can + alter this information (for instance to record historic + information) + + .. container:: paragraph + + The next step is to decide how the policy should do its job, + i.e. what flavor it has, how many states are needed, and how + many tasks. There are many possible combinations, for + instance: + + .. container:: ulist + + - Simple / God: a simple policy with 1 state and 1 task, + which is doing everything for the decision-making. This + is the ideal policy for simple situation, e.g. deciding + on configuration parameters or simple access control. + + - Simple sequence: a simple policy with a number of states + each having a single task. This is a very good policy for + simple decision-making with different steps. For + instance, a classic action policy (ECA) would have 3 + states (E, C, and A) with some logic (1 task) in each + state. + + - Simple selective: a policy with 1 state but more than one + task. Here, the appropriate task (and it’s logic) will be + selected at execution time. This policy is very good for + dealing with similar (or the same) situation in different + contexts. For instance, the tasks can be related to + available external software, or to current work load on + the compute node, or to time of day. + + - Selective: any number of states having any number of + tasks (usually more than 1 task). This is a combination + of the two policies above, for instance an ECA policy + with more than one task in E, C, and A. + + - Classic directed: a policy with more than one state, each + having one task, but a non-sequential execution. This + means that the sequence of the states is not pre-defined + in the policy (as would be for all cases above) but + calculated at runtime. This can be good to realize + decision trees based on contextual information. + + - Super Adaptive: using the full potential of the APEX + policy model, states and tasks and state execution are + fully flexible and calculated at runtime (per policy + execution). This policy is very close to a general + programming system (with only a few limitations), but can + solve very hard problems. + + .. container:: paragraph + + The final step is to select a response that the policy + creates. Possible responses have been discussed in the + literature for a very long time. A few examples are: + + .. container:: ulist + + - Obligation (deontic for what should happen) + + - Authorization (e.g. for rule-based or other access + control or security systems) + + - Intent (instead of providing detailed actions the + response is an intent statement and a further system + processes that) + + - Delegation (hand the problem over to someone else, + possibly with some information or instructions) + + - Fail / Error (the policy has encountered a problem, and + reports it) + + - Feedback (why did the policy make a certain decision) + +Flexible Deployment +^^^^^^^^^^^^^^^^^^^ + + .. container:: sectionbody + + .. container:: paragraph + + APEX can be deployed in various ways. The following figure + shows a few of these deployment options. Engine and (policy) + executors are named UPe (universal policy engine, APEX + engine) and UPx (universal policy executor, the APEX + internal state machine executor). + + .. container:: imageblock + + .. container:: content + + |APEX Deployment Options| + + .. container:: title + + Figure 6. APEX Deployment Options + + .. container:: olist loweralpha + + a. For an interface or class + + .. container:: ulist + + - Either UPx or UPe as association + + b. For an application + + .. container:: ulist + + - UPx as object for single policies + + - UPe as object for multiple policies + + c. For a component (as service) + + .. container:: ulist + + - UPe as service for requests + + - UPec as service for requests + + d. As a service (PolaS) + + .. container:: ulist + + - One or more UPe with service i/f + + - One or more Upec/UPec with service i/f + + - One or more Upec/UPec with service i/f + + e. In a control loop + + .. container:: ulist + + - UPe as decision making part + + - UPec as decision making part + + f. On cloud compute nodes + + .. container:: ulist + + - Nodes with only UPe or Upec + + - Nodes with any combination of UPe, UPec + + g. A cloud example + + .. container:: ulist + + - Left: 2 UPec managing several UPe on different + cloud nodes + + - Right: 2 large UPec with different UPe/UPec + deployments + +Flexible Clustering +^^^^^^^^^^^^^^^^^^^ + + .. container:: sectionbody + + .. container:: paragraph + + APEX can be clustered in various ways. The following figure + shows a few of these clustering options. Cluster, engine and + (policy) executors are named UPec (universal policy + cluster), UPe (universal policy engine, APEX engine) and UPx + (universal policy executor, the APEX internal state machine + executor). + + .. container:: imageblock + + .. container:: content + + |APEX Clustering Options| + + .. container:: title + + Figure 7. APEX Clustering Options + + .. container:: olist loweralpha + + a. Single source/target, single UPx + + .. container:: ulist + + - Simple forward + + b. Multiple sources/targets, single UPx + + .. container:: ulist + + - Simple forward + + c. Single source/target, multiple UPx + + .. container:: ulist + + - Multithreading (MT) in UPe + + d. Multiple sources/targets, multiple UPx instances + + .. container:: ulist + + - Simple forward & MT in UPe + + e. Multiple non-MT UPe in UPec + + .. container:: ulist + + - Simple event routing + + f. Multiple MT UPe in UPec + + .. container:: ulist + + - Simple event routing + + g. Mixed UPe in UPec + + .. container:: ulist + + - Simple event routing + + h. Multiple non-MT UPec in UPec + + .. container:: ulist + + - Intelligent event routing + + i. Multiple mixed UPec in UPec + + .. container:: ulist + + - Intelligent event routing + + .. container:: olist loweralpha + + k. Mix of UPec in multiple UPec + + .. container:: ulist + + - External intelligent event routing + + - Optimized with UPec internal routing + +Resources +^^^^^^^^^ + + .. container:: sectionbody + + .. container:: ulist + + - APEX Documentation hosted on Github: + https://ericsson.github.io/apex-docs + + - APEX source code repository hosted by ONAP: + https://gerrit.onap.org/r/#/admin/projects/policy/apex-pdp + + - Issue Management (source and documentation, ONAP JIRA, + requires a Linux Foundation ID): + https://jira.onap.org/projects/POLICY/issues + + - List of APEX publications: + https://ericsson.github.io/apex-docs/apex-publications.html + +.. container:: + :name: footer + + .. container:: + :name: footer-text + + 2.0.0-SNAPSHOT + Last updated 2018-09-04 16:04:24 IST + +.. |Simple APEX Overview| image:: images/apex-intro/ApexSimple.png +.. |APEX States and Context| image:: images/apex-intro/ApexStatesAndContext.png +.. |The APEX Eco-System| image:: images/apex-intro/ApexEcosystem.png +.. |APEX Configuration Matrix| image:: images/apex-intro/ApexEngineConfig.png +.. |APEX Policy Matrix| image:: images/apex-intro/ApexPolicyMatrix.png +.. |APEX Deployment Options| image:: images/apex-intro/UpeeDeploymentOptions.png +.. |APEX Clustering Options| image:: images/apex-intro/UpeeClusterOptions.png + diff --git a/docs/apex/APEX-OnapPf-Guide.rst b/docs/apex/APEX-OnapPf-Guide.rst new file mode 100644 index 00000000..c9083477 --- /dev/null +++ b/docs/apex/APEX-OnapPf-Guide.rst @@ -0,0 +1,413 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 + + +APEX-OnapPf Guide +***************** + +.. contents:: + :depth: 3 + +Installation +^^^^^^^^^^^^ + +Build and Install +------------------- + + .. container:: paragraph + + Refer `Apex User Manual <https://docs.onap.org/en/casablanca/submodules/policy/apex-pdp.git/docs/APEX-User-Manual.html>`_ to find details on the build and installation of the APEX component. Information on the requirements and system configuration can also be found here. + +Installation Layout +------------------- + + .. container:: paragraph + + A full installation of APEX comes with the following layout. + + .. container:: listingblock + + .. container:: content + + :: + + $APEX_HOME + ├───bin (1) + ├───etc (2) + │ ├───editor + │ ├───hazelcast + │ ├───infinispan + │ └───META-INF + │ ├───onappf + | └───config (3) + │ └───ssl (4) + ├───examples (5) + │ ├───config (6) + │ ├───docker (7) + │ ├───events (8) + │ ├───html (9) + │ ├───models (10) + │ └───scripts (11) + ├───lib (12) + │ └───applications (13) + └───war (14) + + .. container:: colist arabic + + +-----------------------------------+-----------------------------------+ + | **1** | binaries, mainly scripts (bash | + | | and bat) to start the APEX engine | + | | and applications | + +-----------------------------------+-----------------------------------+ + | **2** | configuration files, such as | + | | logback (logging) and third party | + | | library configurations | + +-----------------------------------+-----------------------------------+ + | **3** | configuration file for | + | | APEXOnapPf, such as | + | | OnapPfConfig.json (initial | + | | configuration for APEXOnapPf) | + +-----------------------------------+-----------------------------------+ + | **4** | ssl related files such as | + | | policy-keystore and | + | | policy-truststore | + +-----------------------------------+-----------------------------------+ + | **5** | example policy models to get | + | | started | + +-----------------------------------+-----------------------------------+ + | **6** | configurations for the examples | + | | (with sub directories for | + | | individual examples) | + +-----------------------------------+-----------------------------------+ + | **7** | Docker files and additional | + | | Docker instructions for the | + | | examples | + +-----------------------------------+-----------------------------------+ + | **8** | example events for the examples | + | | (with sub directories for | + | | individual examples) | + +-----------------------------------+-----------------------------------+ + | **9** | HTML files for some examples, | + | | e.g. the Decisionmaker example | + +-----------------------------------+-----------------------------------+ + | **10** | the policy models, generated for | + | | each example (with sub | + | | directories for individual | + | | examples) | + +-----------------------------------+-----------------------------------+ + | **11** | additional scripts for the | + | | examples (with sub directories | + | | for individual examples) | + +-----------------------------------+-----------------------------------+ + | **12** | the library folder with all Java | + | | JAR files | + +-----------------------------------+-----------------------------------+ + | **13** | applications, also known as jar | + | | with dependencies (or fat jars), | + | | individually deployable | + +-----------------------------------+-----------------------------------+ + | **14** | WAR files for web applications | + +-----------------------------------+-----------------------------------+ + + +Verify the APEXOnapPf Installation +---------------------------------- + + .. container:: paragraph + + When APEX is installed and all settings are realized, the + installation can be verified. + +Verify Installation - run APEXOnapPf +#################################### + + .. container:: paragraph + + A simple verification of an APEX installation can be done by + simply starting the APEXOnapPf without any configuration. On + Unix (or Cygwin) start the engine using + ``$APEX_HOME/bin/apexOnapPf.sh``. On Windows start the engine + using ``%APEX_HOME%\bin\apexOnapPf.bat``. The engine will fail + to fully start. However, if the output looks similar to the + following line, the APEX installation is realized. + + .. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + Apex [main] INFO o.o.p.a.s.onappf.ApexStarterMain - In ApexStarter with parameters [] + Apex [main] ERROR o.o.p.a.s.onappf.ApexStarterMain - start of services-onappf failed + org.onap.policy.apex.services.onappf.exception.ApexStarterException: apex starter configuration file was not specified as an argument + at org.onap.policy.apex.services.onappf.ApexStarterCommandLineArguments.validateReadableFile(ApexStarterCommandLineArguments.java:278) + at org.onap.policy.apex.services.onappf.ApexStarterCommandLineArguments.validate(ApexStarterCommandLineArguments.java:165) + at org.onap.policy.apex.services.onappf.ApexStarterMain.<init>(ApexStarterMain.java:66) + at org.onap.policy.apex.services.onappf.ApexStarterMain.main(ApexStarterMain.java:165) + + + .. container:: paragraph + + To fully verify the installation, run the ApexOnapPf by providing the configuration files. + + .. container:: paragraph + + OnapPfConfig.json is the file which contains the initial configuration to startup the ApexStarter service. The dmaap topics to be used for sending or receiving messages is also specified in the this file. Provide this file as argument while running the ApexOnapPf. + + .. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + # $APEX_HOME/bin/apexOnapPf.sh -c $APEX_HOME/etc/onappf/config/OnapPfConfig.json (1) + # $APEX_HOME/bin/apexOnapPf.sh -c C:/apex/apex-full-2.0.0-SNAPSHOT/etc/onappf/config/OnapPfConfig.json (2) + >%APEX_HOME%\bin\apexOnapPf.bat -c %APEX_HOME%\etc\onappf\config\OnapPfConfig.json (3) + + .. container:: colist arabic + + +-------+---------+ + | **1** | UNIX | + +-------+---------+ + | **2** | Cygwin | + +-------+---------+ + | **3** | Windows | + +-------+---------+ + + .. container:: paragraph + + The APEXOnapPf should start successfully. Assuming the logging levels are + not changed (default level is ``info``), the output should look + similar to this (last few lines) + + .. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + In ApexStarter with parameters [-c, C:/apex/etc/onappf/config/OnapPfConfig.json] . . . + Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager starting set alive + Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager starting register pdp status context object + Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager starting topic sinks + Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager starting Pdp Status publisher + Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager starting Register pdp update listener + Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager starting Register pdp state change request dispatcher + Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager starting Message Dispatcher . . . + Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager starting Rest Server . . . + Apex [main] INFO o.o.p.c.u.services.ServiceManager - service manager started + Apex [main] INFO o.o.p.a.s.onappf.ApexStarterMain - Started ApexStarter service + + .. container:: paragraph + + The ApexOnapPf service is now running, sending heartbeat messages to dmaap (which will be received by PAP) and listening for messages from PAP on the dmaap topic specified. Based on instructions from PAP, the ApexOnapPf will deploy or undeploy policies on the ApexEngine. + + .. container:: paragraph + + Terminate APEX by simply using ``CTRL+C`` in the console. + +Running APEXOnapPf in Docker +---------------------------- + + .. container:: paragraph + + Running APEX from the ONAP docker repository only requires 2 + commands: + + .. container:: olist arabic + + 1. Log into the ONAP docker repo + + .. container:: listingblock + + .. container:: content + + :: + + docker login -u docker -p docker nexus3.onap.org:10003 + + + 2. Run the APEX docker image + + .. container:: listingblock + + .. container:: content + + :: + + docker run -p 6969:6969 -p 23324:23324 -it --rm nexus3.onap.org:10001/onap/policy-apex-pdp:2.1-SNAPSHOT-latest /bin/bash -c "/opt/app/policy/apex-pdp/bin/apexOnapPf.sh -c /opt/app/policy/apex-pdp/etc/onappf/config/OnapPfConfig.json" + + .. container:: paragraph + + To run the ApexOnapPf, the startup script apexOnapPf.sh along with the required configuration files are specified. Also, the ports 6969 (healthcheck) and 23324 (deployment port for the ApexEngine) are exposed. + +Build a Docker Image +#################### + + .. container:: paragraph + + Alternatively, one can use the Dockerfile defined in the Docker + package to build an image. + + .. container:: listingblock + + .. container:: title + + APEX Dockerfile + + .. container:: content + + .. code:: + :number-lines: + + # + # Docker file to build an image that runs APEX on Java 8 in alpine + # + FROM onap/policy-base-alpine:1.4.0 + + LABEL maintainer="Policy Team" + + ARG BUILD_VERSION=${BUILD_VERSION} + ARG POLICY_LOGS=/var/log/onap/policy/apex-pdp + + ENV BUILD_VERSION ${BUILD_VERSION} + ENV POLICY_HOME=/opt/app/policy + ENV POLICY_APEX_PDP_HOME=${POLICY_HOME}/apex-pdp + ENV POLICY_LOGS=${POLICY_LOGS} + + RUN apk add --no-cache \ + vim \ + iproute2 \ + iputils + + # Create apex user and group + RUN addgroup -S apexuser && adduser -S apexuser -G apexuser + + + # Add Apex-specific directories and set ownership as the Apex admin user + RUN mkdir -p ${POLICY_APEX_PDP_HOME} \ + && mkdir -p ${POLICY_LOGS} \ + && chown -R apexuser:apexuser ${POLICY_LOGS} + + # Unpack the tarball + RUN mkdir /packages + COPY apex-pdp-package-full.tar.gz /packages + RUN tar xvfz /packages/apex-pdp-package-full.tar.gz --directory ${POLICY_APEX_PDP_HOME} \ + && rm /packages/apex-pdp-package-full.tar.gz + + # Ensure everything has the correct permissions + RUN find /opt/app -type d -perm 755 \ + && find /opt/app -type f -perm 644 \ + && chmod a+x ${POLICY_APEX_PDP_HOME}/bin/* + + # Copy examples to Apex user area + RUN cp -pr ${POLICY_APEX_PDP_HOME}/examples /home/apexuser \ + && chown -R apexuser:apexuser /home/apexuser/* + + USER apexuser + ENV PATH ${POLICY_APEX_PDP_HOME}/bin:$PATH + WORKDIR /home/apexuser + + +APEXOnapPf Configuration File Explained +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + + .. container:: paragraph + + The ApexOnapPf is initialized using a configuration file: + + .. container:: ulist + + - OnapPfConfig.json + +Format of the configuration file (OnapPfConfig.json) explained +-------------------------------------------------------------- + + .. container:: paragraph + + The configuration file is a JSON file containing the initial values for configuring the rest server for healthcheck and the pdp itself. + The topic infrastructure and the topics to be used for sending or receiving messages is specified in this configuration file. + A sample can be found below: + + .. container:: listingblock + + .. container:: content + + .. code:: + + { + "name":"ApexStarterParameterGroup", + "restServerParameters": { (1) + "host": "0.0.0.0", + "port": 6969, + "userName": "...", + "password": "...", + "https": true (2) + }, + "pdpStatusParameters":{ + "timeIntervalMs": 120000, (3) + "pdpType":"apex", (4) + "description":"Pdp Heartbeat", + "supportedPolicyTypes":[{"name":"onap.policies.controlloop.operational.Apex","version":"1.0.0"}] (5) + }, + "topicParameterGroup": { + "topicSources" : [{ (6) + "topic" : "POLICY-PDP-PAP", (7) + "servers" : [ "message-router" ], (8) + "topicCommInfrastructure" : "dmaap" (9) + }], + "topicSinks" : [{ (10) + "topic" : "POLICY-PDP-PAP", (11) + "servers" : [ "message-router" ], (12) + "topicCommInfrastructure" : "dmaap" (13) + }] + } + } + + .. container:: colist arabic + + +-----------------------------------+-----------------------------------+ + | **1** | parameters for setting up the | + | | rest server such as host, port | + | | userName and password. | + +-----------------------------------+-----------------------------------+ + | **2** | https flag if enabled will enable | + | | https support by the rest server. | + +-----------------------------------+-----------------------------------+ + | **3** | time interval in which PDP-A | + | | has to send heartbeats to PAP. | + | | Specified in milliseconds. | + +-----------------------------------+-----------------------------------+ + | **4** | Type of the pdp. | + +-----------------------------------+-----------------------------------+ + | **5** | List of policy types supported by | + | | the PDP. | + +-----------------------------------+-----------------------------------+ + | **6** | List of topics' details from | + | | which messages are received. | + +-----------------------------------+-----------------------------------+ + | **7** | Topic name of the source to which | + | | PDP-A listens to for messages | + | | from PAP. | + +-----------------------------------+-----------------------------------+ + | **8** | List of servers for the source | + | | topic. | + +-----------------------------------+-----------------------------------+ + | **9** | The source topic infrastructure. | + | | For e.g. dmaap, noop, ueb | + +-----------------------------------+-----------------------------------+ + | **10** | List of topics' details to which | + | | messages are sent to. | + +-----------------------------------+-----------------------------------+ + | **11** | Topic name of the sink to which | + | | PDP-A sends messages to. | + +-----------------------------------+-----------------------------------+ + | **12** | List of servers for the sink | + | | topic. | + +-----------------------------------+-----------------------------------+ + | **13** | The sink topic infrastructure. | + | | For e.g. dmaap, noop, ueb | + +-----------------------------------+-----------------------------------+ diff --git a/docs/apex/APEX-Policy-Guide.rst b/docs/apex/APEX-Policy-Guide.rst new file mode 100644 index 00000000..392f31c7 --- /dev/null +++ b/docs/apex/APEX-Policy-Guide.rst @@ -0,0 +1,2133 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 + + +APEX Policy Guide +***************************** + +.. contents:: + :depth: 3 + +APEX Policy Matrix +^^^^^^^^^^^^^^^^^^ + +APEX Policy Matrix +------------------ + + .. container:: paragraph + + APEX offers a lot of flexibility for defining, deploying, + and executing policies. Based on a theoretic model, it + supports virtually any policy model and allows to + translate legacy policies into the APEX execution format. + However, the most important aspect for using APEX is to + decide what policy is needed, what underlying policy + concepts should be used, and how the decision logic + should be realized. Once these aspects are decided, APEX + can be used to execute the policies. If the policy + evolves, say from a simple decision table to a fully + adaptable policy, only the policy definition requires + change. APEX supports all of that. + + .. container:: paragraph + + The figure below shows a (non-exhaustive) matrix, which + will help to decide what policy is required to solve your + problem. Read the matrix from left to right choosing one + cell in each column. + + .. container:: imageblock + + .. container:: content + + |APEX Policy Matrix| + + .. container:: title + + Figure 1. APEX Policy Matrix + + .. container:: paragraph + + The policy can support one of a number of stimuli with an + associated purpose/model of the policy, for instance: + + .. container:: ulist + + - Configuration, i.e. what should happen. An example is + an event that states an intended network configuration + and the policy should provide the detailed actions for + it. The policy can be realized for instance as an + obligation policy, a promise or an intent. + + - Report, i.e. something did happen. An example is an + event about an error or fault and the policy needs to + repair that problem. The policy would usually be an + obligation, utility function, or goal policy. + + - Monitoring, i.e. something does happen. An example is + a notification about certain network conditions, to + which the policy might (or might not) react. The + policy will mitigate the monitored events or permit + (deny) related actions as an obligation or + authorization. + + - Analysis, i.e. why did something happen. An example is + an analytic component sends insights of a situation + requiring a policy to act on it. The policy can solve + the problem, escalate it, or delegate it as a refrain + or delegation policy. + + - Prediction, i.e. what will happen next. An example are + events that a policy uses to predict a future network + condition. The policy can prevent or enforce the + prediction as an adaptive policy, a utility function, + or a goal. + + - Feedback, i.e. why did something happen or not happen. + Similar to analysis, but here the feedback will be in + the input event and the policy needs to something with + that information. Feedback can be related to history + or experience, for instance a previous policy + execution. The policy needs to be context-aware or be + a meta-policy. + + .. container:: paragraph + + Once the purpose of the policy is decided, the next step + is to look into what context information the policy will + require to do its job. This can range from very simple to + a lot of different information, for instance: + + .. container:: ulist + + - No context, nothing but a trigger event, e.g. a string + or a number, is required + + - Event context, the incoming event provides all + information (more than a string or number) for the + policy + + - Policy context (read only), the policy has access to + additional information related to its class but cannot + change/alter them + + - Policy context (read and write), the policy has access + to additional information related to its class and can + alter this information (for instance to record + historic information) + + - Global context (read only), the policy has access to + additional information of any kind but cannot + change/alter them + + - Global context (read and write), the policy the policy + has access to additional information of any kind and + can alter this information (for instance to record + historic information) + + .. container:: paragraph + + The next step is to decide how the policy should do its + job, i.e. what flavor it has, how many states are needed, + and how many tasks. There are many possible combinations, + for instance: + + .. container:: ulist + + - Simple / God: a simple policy with 1 state and 1 task, + which is doing everything for the decision-making. + This is the ideal policy for simple situation, e.g. + deciding on configuration parameters or simple access + control. + + - Simple sequence: a simple policy with a number of + states each having a single task. This is a very good + policy for simple decision-making with different + steps. For instance, a classic action policy (ECA) + would have 3 states (E, C, and A) with some logic (1 + task) in each state. + + - Simple selective: a policy with 1 state but more than + one task. Here, the appropriate task (and it’s logic) + will be selected at execution time. This policy is + very good for dealing with similar (or the same) + situation in different contexts. For instance, the + tasks can be related to available external software, + or to current work load on the compute node, or to + time of day. + + - Selective: any number of states having any number of + tasks (usually more than 1 task). This is a + combination of the two policies above, for instance an + ECA policy with more than one task in E, C, and A. + + - Classic directed: a policy with more than one state, + each having one task, but a non-sequential execution. + This means that the sequence of the states is not + pre-defined in the policy (as would be for all cases + above) but calculated at runtime. This can be good to + realize decision trees based on contextual + information. + + - Super Adaptive: using the full potential of the APEX + policy model, states and tasks and state execution are + fully flexible and calculated at runtime (per policy + execution). This policy is very close to a general + programming system (with only a few limitations), but + can solve very hard problems. + + .. container:: paragraph + + The final step is to select a response that the policy + creates. Possible responses have been discussed in the + literature for a very long time. A few examples are: + + .. container:: ulist + + - Obligation (deontic for what should happen) + + - Authorization (e.g. for rule-based or other access + control or security systems) + + - Intent (instead of providing detailed actions the + response is an intent statement and a further system + processes that) + + - Delegation (hand the problem over to someone else, + possibly with some information or instructions) + + - Fail / Error (the policy has encountered a problem, + and reports it) + + - Feedback (why did the policy make a certain decision) + +APEX Policy Model +^^^^^^^^^^^^^^^^^ + +Introduction +------------ + + .. container:: paragraph + + The APEX policy model is shown in UML notation in the + figure below. A policy model can be stored in JSON or XML + format in a file or can be held in a database. The APEX + editor creates and modifies APEX policy models. APEX + deployment deploys policy models, and a policy model is + loaded into APEX engines so that the engines can run the + policies in the policy model. + + .. container:: paragraph + + The figure shows four different views of the policy + model: + + .. container:: ulist + + - The general model view shows the main parts of a + policy: state, state output, event, and task. A task + can also have parameters. Data types can be defined on + a per-model basis using either standard atomic types + (such as character, string, numbers) or complex types + from a policy domain. + + - The logic model view emphasizes how decision-making + logic is injected into a policy. There are essentially + three different types of logic: task logic (for + decision making in a task), task selection logic (to + select a task if more than one is defined in a state), + and state finalizer logic (to compute the final output + event of a state and select an appropriate next state + from the policy model). + + - The context model view shows how context is injected + into a policy. States collect all context from their + tasks. A task can define what context it requires for + the decision making, i.e. what context the task logic + will process. Context itself is a collection of items + (individual context information) with data types. + Context can be templated. + + - The event and field model view shows the events in the + policy model. Tasks define what information they + consume (input) and produce (output). This information + is modeled as fields, essentially a key/type tuple in + the model and a key/type/value triple at execution. + Events then are collection of fields. + + .. container:: imageblock + + .. container:: content + + |APEX Policy Model for Execution| + + .. container:: title + + Figure 2. APEX Policy Model for Execution + +Concepts and Keys +################# + + .. container:: paragraph + + Each element of the policy model is called a + *concept*. Each *concept* is a subclass of the + abstract *Concept* class, as shown in the next figure. + Every concept implements the following abstract + methods: + + .. container:: imageblock + + .. container:: content + + |Concepts and Keys| + + .. container:: title + + Figure 3. Concepts and Keys + + .. container:: ulist + + - ``getKey()`` - gets the unique key for this concept + instance in the system + + - ``validate()`` - validates the structure of this + concept, its sub-concepts and its relationships + + - ``clean()`` - carries out housekeeping on the + concept such as trimming strings, remove any + hanging references + + - ``clone()`` - creates a deep copy of an instance of + this concept + + - ``equals()`` - checks if two instances of this + concept are equal + + - ``toString()`` - returns a string representation of + the concept + + - ``hashCode()`` - returns a hash code for the + concept + + - ``copyTo()`` - carries out a deep copy of one + instance of the concept to another instance, + overwriting the target fields. + + .. container:: paragraph + + All concepts must have a *key*, which uniquely + identifies a concept instance. The *key* of a subclass + of an *Concept* must either be an ``ArtifactKey`` or + an ``ReferenceKey``. Concepts that have a stand-alone + independent existence such as *Policy*, *Task*, and + *Event* must have an ``ArtifctKey`` key. Concepts that + are contained in other concepts, that do not exist as + stand-alone concepts must have an ``ReferenceKey`` + key. Examples of such concepts are *State* and + *EventParameter*. + + .. container:: paragraph + + An ``ArticactKey`` has two fields; the *Name* of the + concept it is the key for and the concept’s *Version*. + A concept’s name must be unique in a given + PolicyModel. A concept version is represented using + the well known *major.minor.path* scheme as used in + semantic versioning. + + .. container:: paragraph + + A ``ReferenceKey`` has three fields. The *UserKeyName* + and *UserKeyVersion* fields identify the + ``ArtifactKey`` of the concept in which the concept + keyed by the ``ReferenceKey`` is contained. The + *LocalName* field identifies the contained concept + instance. The *LocalName* must be unique in the + concepts of a given type contained by a parent. + + .. container:: paragraph + + For example, a policy called ``SalesPolicy`` with a + Version of ``1.12.4`` has a state called ``Decide``. + The ``Decide`` state is linked to the ``SalesPolicy`` + with a ``ReferenceKey`` with fields *UserKeyName* of + ``SalesPolicy``, *UserKeyVersion* of ``1.12.4``, and + *LocalName* of ``Decide``. There must not be another + state called ``Decide`` in the policy ``SalesPolicy``. + However, there may well be a state called ``Decide`` + in some other policy called ``PurchasingPolicy``. + + .. container:: paragraph + + Each concept in the model is also a JPA (`Java + Persistence + API <https://en.wikipedia.org/wiki/Java_Persistence_API>`__) + Entity. This means that every concept can be + individually persisted or the entire model can be + persisted en-bloc to any persistence mechanism using + an JPA framework such as + `Hibernate <http://hibernate.org/>`__ or + `EclipseLink <http://www.eclipse.org/eclipselink/>`__. + +Concept: PolicyModel +#################### + + .. container:: paragraph + + The *PolicyModel* concept is a container that holds + the definition of a set of policies and their + associated events, context maps, and tasks. A + *PolicyModel* is implemented as four maps for + policies, events, context maps, and tasks. Each map is + indexed by the key of the policy, event, context map, + or task. Any non-empty policy model must have at least + one entry in its policy, event, and task map because + all policies must have at least one input and output + event and must execute at least one task. + + .. container:: paragraph + + A *PolicyModel* concept is keyed with an + ``ArtifactKey key``. Because a *PolicyModel* is an + ``AxConcept``, calling the ``validate()`` method on a + policy model validates the concepts, structure, and + relationships of the entire policy model. + +Concept: DataType +################# + + .. container:: paragraph + + Data types are tightly controlled in APEX in order to + provide a very high degree of consistency in policies + and to facilitate tracking of changes to context as + policies execute. All context is modeled as a + *DataType* concept. Each DataType concept instance is + keyed with an ``ArtifactKey`` key. The DataType field + identifies the Java class of objects that is used to + represent concept instances that use this data type. + All context has a *DataType*; incoming and outgoing + context is represented by *EventField* concepts and + all other context is represented by *ContextItem* + concepts. + +Concept: Event +############## + + .. container:: paragraph + + An *Event* defines the structure of a message that + passes into or out of an APEX engine or that passes + between two states in an APEX engine. APEX supports + message reception and sending in many formats and all + messages are translated into an *Event* prior to + processing by an APEX engine. Event concepts are keyed + with an ``ArtifactKey`` key. The parameters of an + event are held as a map of *EventField* concept + instances with each parameter indexed by the + *LocalName* of its ``ReferenceKey``. An *Event* has + three fields: + + .. container:: ulist + + - The *NameSpace* identifies the domain of + application of the event + + - The *Source* of the event identifies the system + that emitted the event + + - The *Target* of the event identifies the system + that the event was sent to + + .. container:: paragraph + + A *PolicyModel* contains a map of all the events known + to a given policy model. Although an empty model may + have no events in its event map, any sane policy model + must have at least one *Event* defined. + +Concept: EventField +################### + + .. container:: paragraph + + The incoming context and outgoing context of an event + are the fields of the event. Each field representing a + single piece of incoming or outgoing context. Each + field of an *Event* is represented by an instance of + the *EventField* concept. Each *EventField* concept + instance in an event is keyed with a ``ReferenceKey`` + key, which references the event. The *LocalName* field + of the ``ReferenceKey`` holds the name of the field A + reference to a *DataType* concept defines the data + type that values of this parameter have at run time. + +Concept: ContextMap +################### + + .. container:: paragraph + + The set of context that is available for use by the + policies of a *PolicyModel* is defined as *ContextMap* + concept instances. The *PolicyModel* holds a map of + all the *ContextMap* definitions. A *ContextMap* is + itself a container for a group of related context + items, each of which is represented by a *ContextItem* + concept instance. *ContextMap* concepts are keyed with + an ``ArtifactKey`` key. A developer can use the APEX + Policy Editor to create context maps for their + application domain. + + .. container:: paragraph + + A *ContextMap* uses a map to hold the context items. + The ContextItem concept instances in the map are + indexed by the *LocalName* of their ``ReferenceKey``. + + .. container:: paragraph + + The *ContextMapType* field of a *ContextMap* defines + the type of a context map. The type can have either of + two values: + + .. container:: ulist + + - A *BAG* context map is a context map with fixed + content. Each possible context item in the context + map is defined at design time and is held in the + *ContextMap* context instance as *ContextItem* + concept definitions and only the values of the + context items in the context map can be changed at + run time. The context items in a *BAG* context map + have mixed types and distinct *ContextItem* concept + instances of the same type can be defined. A *BAG* + context map is convenient for defining a group of + context items that are diverse but are related by + domain, such as the characteristics of a device. A + fully defined *BAG* context map has a fully + populated *ContextItem* map but its + *ContextItemTemplate* reference is not defined. + + - A *SAMETYPE* context map is used to represent a + group of *ContextItem* instances of the same type. + Unlike a *BAG* context map, the *ContextItem* + concept instances of a *SAMETYPE* context map can + be added, modified, and deleted at runtime. All + *ContextItem* concept instances in a *SAMETYPE* + context map must be of the same type, and that + context item is defined as a single + *ContextItemTemplate* concept instances at design + time. At run time, the *ContextItemTemplate* + definition is used to create new *ContextItem* + concept instances for the context map on demand. A + fully defined *SAMETYPE context map has an empty + ContextItem map and its ContextItemTemplate\_* + reference is defined. + + .. container:: paragraph + + The *Scope* of a *ContextMap* defines the range of + applicability of a context map in APEX. The following + scopes of applicability are defined: + + .. container:: ulist + + - *EPHEMERAL* scope means that the context map is + owned, used, and modified by a single application, + but the context map only exists while that + application is running + + - *APPLICATION* scope specifies that the context map + is owned, used, and modified by a single + application, the context map is persistent + + - *GLOBAL* scope specifies that the context map is + globally owned and is used and modified by any + application, the context map is persistent + + - *EXTERNAL* scope specifies that the context map is + owned by an external system and may be used in a + read-only manner by any application, the context + map is persistent + + .. container:: paragraph + + A much more sophisticated scoping mechanism for + context maps is envisaged for Apex in future work. In + such a mechanism, the scope of a context map would + work somewhat like the way roles work in security + authentication systems. + +Concept: ContextItem +#################### + + .. container:: paragraph + + Each piece of context in a *ContextMap* is represented + by an instance of the *ContextItem* concept. Each + *ContextItem* concept instance in a context map keyed + with a ``ReferenceKey`` key, which references the + context map of the context item. The *LocalName* field + of the ``ReferenceKey`` holds the name of the context + item in the context map A reference to a *DataType* + concept defines the data type that values of this + context item have at run time. The *WritableFlag* + indicates if the context item is read only or + read-write at run time. + +Concept: ContextItemTemplate +############################ + + .. container:: paragraph + + In a *SAMETYPE* *ContextMap*, the + *ContextItemTemplate* definition provides a template + for the *ContextItem* instances that will be created + on the context map at run time. Each *ContextItem* + concept instance in the context map is created using + the *ContextItemTemplate* template. It is keyed with a + ``ReferenceKey`` key, which references the context map + of the context item. The *LocalName* field of the + ``ReferenceKey``, supplied by the creator of the + context item at run time, holds the name of the + context item in the context map. A reference to a + *DataType* concept defines the data type that values + of this context item have at run time. The + *WritableFlag* indicates if the context item is read + only or read-write at run time. + +Concept: Task +############# + + .. container:: paragraph + + The smallest unit of logic in a policy is a *Task*. A + task encapsulates a single atomic unit of logic, and + is designed to be a single indivisible unit of + execution. A task may be invoked by a single policy or + by many policies. A task has a single trigger event, + which is sent to the task when it is invoked. Tasks + emit one or more outgoing events, which carry the + result of the task execution. Tasks may use or modify + context as they execute. + + .. container:: paragraph + + The Task concept definition captures the definition of + an APEX task. Task concepts are keyed with an + ``ArtifactKey`` key. The Trigger of the task is a + reference to the *Event* concept that triggers the + task. The *OutgoingEvents* of a task are a set of + references to *Event* concepts that may be emitted by + the task. + + .. container:: paragraph + + All tasks have logic, some code that is programmed to + execute the work of the task. The *Logic* concept of + the task holds the definition of that logic. + + .. container:: paragraph + + The *Task* definition holds a set of *ContextItem* and + *ContextItemTemplate* context items that the task is + allow to access, as defined by the task developer at + design time. The type of access (read-only or read + write) that a task has is determined by the + *WritableFlag* flag on the individual context item + definitions. At run time, a task may only access the + context items specified in its context item set, the + APEX engine makes only the context items in the task + context item set is available to the task. + + .. container:: paragraph + + A task can be configured with startup parameters. The + set of parameters that can be configured on a task are + defined as a set of *TaskParameter* concept + definitions. + +Concept: TaskParameter +###################### + + .. container:: paragraph + + Each configuration parameter of a task are represented + as a *Taskparameter* concept keyed with a + ``ReferenceKey`` key, which references the task. The + *LocalName* field of the ``ReferenceKey`` holds the + name of the parameter. The *DefaultValue* field + defines the default value that the task parameter is + set to. The value of *TaskParameter* instances can be + overridden at deployment time by specifying their + values in the configuration information passed to APEX + engines. + +Concept: Logic +############## + + .. container:: paragraph + + The *Logic* concept instance holds the actual + programmed task logic for a task defined in a *Task* + concept or the programmed task selection logic for a + state defined in a *State* concept. It is keyed with a + ``ReferenceKey`` key, which references the task or + state that owns the logic. The *LocalName* field of + the Logic concept is the name of the logic. + + .. container:: paragraph + + The *LogicCode* field of a Logic concept definition is + a string that holds the program code that is to be + executed at run time. The *LogicType* field defines + the language of the code. The standard values are the + logic languages supported by APEX: + `JAVASCRIPT <https://en.wikipedia.org/wiki/JavaScript>`__, + `JAVA <https://java.com/en/>`__, + `JYTHON <http://www.jython.org/>`__, + `JRUBY <http://jruby.org/>`__, or + `MVEL <https://en.wikibooks.org/wiki/Transwiki:MVEL_Language_Guide>`__. + + .. container:: paragraph + + The APEX engine uses the *LogicType* field value to + decide which language interpreter to use for a task + and then sends the logic defined in the *LogicCode* + field to that interpreter. + +Concept: Policy +############### + + .. container:: paragraph + + The *Policy* concept defines a policy in APEX. The + definition is rather straightforward. A policy is made + up of a set of states with the flavor of the policy + determining the structure of the policy states and the + first state defining what state in the policy executes + first. *Policy* concepts are keyed with an + ``ArtifactKey`` key. + + .. container:: paragraph + + The *PolicyFlavour* of a *Policy* concept specifies + the structure that will be used for the states in the + policy. A number of commonly used policy patterns are + supported as APEX policy flavors. The standard policy + flavors are: + + .. container:: ulist + + - The *MEDA* flavor supports policies written to the + `MEDA policy + pattern <https://www.researchgate.net/publication/282576518_Dynamically_Adaptive_Policies_for_Dynamically_Adaptive_Telecommunications_Networks>`__ + and require a sequence of four states: namely + *Match*, *Establish*, *Decide* and *Act*. + + - The *OODA* flavor supports policies written to the + `OODA loop + pattern <https://en.wikipedia.org/wiki/OODA_loop>`__ + and require a sequence of four states: namely + *Observe*, *Orient*, *Decide* and *Act*. + + - The *ECA* flavor supports policies written to the + `ECA active rule + pattern <https://en.wikipedia.org/wiki/Event_condition_action>`__ + and require a sequence of three states: namely + *Event*, *Condition* and *Action* + + - The *XACML* flavor supports policies written in + `XACML <https://en.wikipedia.org/wiki/XACML>`__ and + require a single state: namely *XACML* + + - The *FREEFORM* flavor supports policies written in + an arbitrary style. A user can define a *FREEFORM* + policy as an arbitrarily long chain of states. + + .. container:: paragraph + + The *FirstState* field of a *Policy* definition is the + starting point for execution of a policy. Therefore, + the trigger event of the state referenced in the + *FirstState* field is also the trigger event for the + entire policy. + +Concept: State +############## + + .. container:: paragraph + + The *State* concept represents a phase or a stage in a + policy, with a policy being composed of a series of + states. Each state has at least one but may have many + tasks and, on each run of execution, a state executes + one and only one of its tasks. If a state has more + than one task, then its task selection logic is used + to select which task to execute. Task selection logic + is programmable logic provided by the state designer. + That logic can use incoming, policy, global, and + external context to select which task best + accomplishes the purpose of the state in a give + situation if more than one task has been specified on + a state. A state calls one and only one task when it + is executed. + + .. container:: paragraph + + Each state is triggered by an event, which means that + all tasks of a state must also be triggered by that + same event. The set of output events for a state is + the union of all output events from all tasks for that + task. In practice at the moment, because a state can + only have a single input event, a state that is not + the final state of a policy may only output a single + event and all tasks of that state may also only output + that single event. In future work, the concept of + having a less restrictive trigger pattern will be + examined. + + .. container:: paragraph + + A *State* concept is keyed with a ``ReferenceKey`` + key, which references the *Policy* concept that owns + the state. The *LocalName* field of the + ``ReferenceKey`` holds the name of the state. As a + state is part of a chain of states, the *NextState* + field of a state holds the ``ReferenceKey`` key of the + state in the policy to execute after this state. + + .. container:: paragraph + + The *Trigger* field of a state holds the + ``ArtifactKey`` of the event that triggers this state. + The *OutgoingEvents* field holds the ``ArtifactKey`` + references of all possible events that may be output + from the state. This is a set that is the union of all + output events of all tasks of the state. + + .. container:: paragraph + + The *Task* concepts that hold the definitions of the + task for the state are held as a set of + ``ArtifactKey`` references in the state. The + *DefaultTask* field holds a reference to the default + task for the state, a task that is executed if no task + selection logic is specified. If the state has only + one task, that task is the default task. + + .. container:: paragraph + + The *Logic* concept referenced by a state holds the + task selection logic for a state. The task selection + logic uses the incoming context (parameters of the + incoming event) and other context to determine the + best task to use to execute its goals. The state holds + a set of references to *ContextItem* and + *ContextItemTemplate* definitions for the context used + by its task selection logic. + +Writing Logic +^^^^^^^^^^^^^ + +Writing APEX Task Logic +----------------------- + + .. container:: paragraph + + Task logic specifies the behavior of an Apex Task. This + logic can be specified in a number of ways, exploiting + Apex’s plug-in architecture to support a range of logic + executors. In Apex scripted Task Logic can be written in + any of these languages: + + .. container:: ulist + + - ```MVEL`` <https://en.wikipedia.org/wiki/MVEL>`__, + + - ```JavaScript`` <https://en.wikipedia.org/wiki/JavaScript>`__, + + - ```JRuby`` <https://en.wikipedia.org/wiki/JRuby>`__ or + + - ```Jython`` <https://en.wikipedia.org/wiki/Jython>`__. + + .. container:: paragraph + + These languages were chosen because the scripts can be + compiled into Java bytecode at runtime and then + efficiently executed natively in the JVM. Task Logic an + also be written directly in Java but needs to be + compiled, with the resulting classes added to the + classpath. There are also a number of other Task Logic + types (e.g. Fuzzy Logic), but these are not supported as + yet. This guide will focus on the scripted Task Logic + approaches, with MVEL and JavaScript being our favorite + languages. In particular this guide will focus on the + Apex aspects of the scripts. However, this guide does not + attempt to teach you about the scripting languages + themselves … that is up to you! + + .. tip:: + JVM-based scripting languages + For more more information on scripting for the Java platform see: https://docs.oracle.com/javase/8/docs/technotes/guides/scripting/prog_guide/index.html + + .. note:: + What do Tasks do? + The function of an Apex Task is to provide the logic that can be executed for an Apex State as one of the steps in + an Apex Policy. Each task receives some *incoming fields*, executes some logic (e.g: make a decision based on + *shared state* or *context*, *incoming fields*, *external context*, etc.), perhaps set some *shared state* or + *context* and then emits *outgoing fields*. The state that uses the task is responsible for extracting the + *incoming fields* from the state input event. The state also has an *output mapper* associated with the task, and + this *output mapper* is responsible for mapping the *outgoing fields* from the task into an appropriate + output event for the state. + + .. container:: paragraph + + First lets start with a sample task, drawn from the "My + First Apex Policy" example: The task "MorningBoozeCheck" + from the "My First Apex Policy" example is available in + both MVEL and JavaScript: + + .. container:: listingblock + + .. container:: title + + Javascript code for the ``MorningBoozeCheck`` task + + .. container:: content + + .. code:: javascript + :number-lines: + + /* + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + + var returnValueType = Java.type("java.lang.Boolean"); + var returnValue = new returnValueType(true); + + // Load compatibility script for imports etc + load("nashorn:mozilla_compat.js"); + importPackage(java.text); + importClass(java.text.SimpleDateFormat); + + executor.logger.info("Task Execution: '"+executor.subject.id+"'. Input Fields: '"+executor.inFields+"'"); + + executor.outFields.put("amount" , executor.inFields.get("amount")); + executor.outFields.put("assistant_ID", executor.inFields.get("assistant_ID")); + executor.outFields.put("notes" , executor.inFields.get("notes")); + executor.outFields.put("quantity" , executor.inFields.get("quantity")); + executor.outFields.put("branch_ID" , executor.inFields.get("branch_ID")); + executor.outFields.put("item_ID" , executor.inFields.get("item_ID")); + executor.outFields.put("time" , executor.inFields.get("time")); + executor.outFields.put("sale_ID" , executor.inFields.get("sale_ID")); + + item_id = executor.inFields.get("item_ID"); + + //All times in this script are in GMT/UTC since the policy and events assume time is in GMT. + var timenow_gmt = new Date(Number(executor.inFields.get("time"))); + + var midnight_gmt = new Date(Number(executor.inFields.get("time"))); + midnight_gmt.setUTCHours(0,0,0,0); + + var eleven30_gmt = new Date(Number(executor.inFields.get("time"))); + eleven30_gmt.setUTCHours(11,30,0,0); + + var timeformatter = new java.text.SimpleDateFormat("HH:mm:ss z"); + + var itemisalcohol = false; + if(item_id != null && item_id >=1000 && item_id < 2000) + itemisalcohol = true; + + if( itemisalcohol + && timenow_gmt.getTime() >= midnight_gmt.getTime() + && timenow_gmt.getTime() < eleven30_gmt.getTime()) { + + executor.outFields.put("authorised", false); + executor.outFields.put("message", "Sale not authorised by policy task " + + executor.subject.taskName+ " for time " + timeformatter.format(timenow_gmt.getTime()) + + ". Alcohol can not be sold between " + timeformatter.format(midnight_gmt.getTime()) + + " and " + timeformatter.format(eleven30_gmt.getTime())); + } + else{ + executor.outFields.put("authorised", true); + executor.outFields.put("message", "Sale authorised by policy task " + + executor.subject.taskName + " for time "+timeformatter.format(timenow_gmt.getTime())); + } + + /* + This task checks if a sale request is for an item that is an alcoholic drink. + If the local time is between 00:00:00 GMT and 11:30:00 GMT then the sale is not + authorised. Otherwise the sale is authorised. + In this implementation we assume that items with item_ID value between 1000 and + 2000 are all alcoholic drinks :-) + */ + + .. container:: listingblock + + .. container:: title + + MVEL code for the ``MorningBoozeCheck`` task + + .. container:: content + + .. code:: javascript + :number-lines: + + /* + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + import java.util.Date; + import java.util.Calendar; + import java.util.TimeZone; + import java.text.SimpleDateFormat; + + logger.info("Task Execution: '"+subject.id+"'. Input Fields: '"+inFields+"'"); + + outFields.put("amount" , inFields.get("amount")); + outFields.put("assistant_ID", inFields.get("assistant_ID")); + outFields.put("notes" , inFields.get("notes")); + outFields.put("quantity" , inFields.get("quantity")); + outFields.put("branch_ID" , inFields.get("branch_ID")); + outFields.put("item_ID" , inFields.get("item_ID")); + outFields.put("time" , inFields.get("time")); + outFields.put("sale_ID" , inFields.get("sale_ID")); + + item_id = inFields.get("item_ID"); + + //The events used later to test this task use GMT timezone! + gmt = TimeZone.getTimeZone("GMT"); + timenow = Calendar.getInstance(gmt); + df = new SimpleDateFormat("HH:mm:ss z"); + df.setTimeZone(gmt); + timenow.setTimeInMillis(inFields.get("time")); + + midnight = timenow.clone(); + midnight.set( + timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH), + timenow.get(Calendar.DATE),0,0,0); + eleven30 = timenow.clone(); + eleven30.set( + timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH), + timenow.get(Calendar.DATE),11,30,0); + + itemisalcohol = false; + if(item_id != null && item_id >=1000 && item_id < 2000) + itemisalcohol = true; + + if( itemisalcohol + && timenow.after(midnight) && timenow.before(eleven30)){ + outFields.put("authorised", false); + outFields.put("message", "Sale not authorised by policy task "+subject.taskName+ + " for time "+df.format(timenow.getTime())+ + ". Alcohol can not be sold between "+df.format(midnight.getTime())+ + " and "+df.format(eleven30.getTime())); + return true; + } + else{ + outFields.put("authorised", true); + outFields.put("message", "Sale authorised by policy task "+subject.taskName+ + " for time "+df.format(timenow.getTime())); + return true; + } + + /* + This task checks if a sale request is for an item that is an alcoholic drink. + If the local time is between 00:00:00 GMT and 11:30:00 GMT then the sale is not + authorised. Otherwise the sale is authorised. + In this implementation we assume that items with item_ID value between 1000 and + 2000 are all alcoholic drinks :-) + */ + + .. container:: paragraph + + The role of the task in this simple example is to copy + the values in the incoming fields into the outgoing + fields, then examine the values in some incoming fields + (``item_id`` and ``time``), then set the values in some + other outgoing fields (``authorised`` and ``message``). + + .. container:: paragraph + + Both MVEL and JavaScript like most JVM-based scripting + languages can use standard Java libraries to perform + complex tasks. Towards the top of the scripts you will + see how to import Java classes and packages to be used + directly in the logic. Another thing to notice is that + Task Logic should return a ``java.lang.Boolean`` value + ``true`` if the logic executed correctly. If the logic + fails for some reason then ``false`` can be returned, but + this will cause the policy invoking this task will fail + and exit. + + .. note:: + How to return a value from task logic + Some languages explicitly support returning values from the script (e.g. MVEL and JRuby) using an explicit + return statement (e.g. ``return true``), other languages do not (e.g. JavaScript and Jython). For + languages that do not support the ``return`` statement, a special field called ``returnValue`` must be + created to hold the result of the task logic operation (i.e. assign a ``java.lang.Boolean`` + value to the ``returnValue`` field before completing the task). + Also, in MVEL if there is no explicit return statement then the return value of the last executed statement will return + (e.g. the statement a=(1+2) will return the value 3). + + .. container:: paragraph + + Besides these imported classes and normal language + features Apex provides some natively available parameters + and functions that can be used directly. At run-time + these parameters are populated by the Apex execution + environment and made natively available to logic scripts + each time the logic script is invoked. (These can be + accessed using the ``executor`` keyword for most + languages, or can be accessed directly without the + ``executor`` keyword in MVEL): + + Table 1. The ``executor`` Fields / Methods + ++------------+-------------+--------------------------------+-------------------------------------------------------------------------------------+ +| Name | Type | Java type | Description | ++============+=============+================================+=====================================================================================+ +| inFields | Fields | java.util.Map <String,Object> | .. container:: paragraph | +| | | | | +| | | | The incoming task fields. This is implemented as a standard Java | +| | | | Java (unmodifiable) Map | +| | | | | +| | | | .. container:: | +| | | | | +| | | | .. container:: content | +| | | | | +| | | | .. container:: paragraph | +| | | | | +| | | | **Example:** | +| | | | | +| | | | .. code:: javascript | +| | | | | +| | | | executor.logger.debug("Incoming fields: " | +| | | | +executor.inFields.entrySet()); | +| | | | var item_id = executor.incomingFields["item_ID"]; | +| | | | if (item_id >=1000) { ... } | ++------------+-------------+--------------------------------+-------------------------------------------------------------------------------------+ +| outFields | Fields | java.util.Map <String,Object> | .. container:: paragraph | +| | | | | +| | | | The outgoing task fields. This is implemented as a standard initially empty Java | +| | | | (modifiable) Map. To create a new schema-compliant instance of a field object | +| | | | see the utility method subject.getOutFieldSchemaHelper() below | +| | | | | +| | | | .. container:: | +| | | | | +| | | | .. container:: content | +| | | | | +| | | | .. container:: paragraph | +| | | | | +| | | | **Example:** | +| | | | | +| | | | .. code:: javascript | +| | | | | +| | | | executor.outFields["authorised"] = false; | ++------------+-------------+--------------------------------+-------------------------------------------------------------------------------------+ +| logger | Logger | org.slf4j.ext.XLogger | .. container:: paragraph | +| | | | | +| | | | A helpful logger | +| | | | | +| | | | .. container:: | +| | | | | +| | | | .. container:: content | +| | | | | +| | | | .. container:: paragraph | +| | | | | +| | | | **Example:** | +| | | | | +| | | | .. code:: javascript | +| | | | | +| | | | executor.logger.info("Executing task: " | +| | | | +executor.subject.id); | ++------------+-------------+--------------------------------+-------------------------------------------------------------------------------------+ +| TRUE/FALSE | boolean | java.lang.Boolean | .. container:: paragraph | +| | | | | +| | | | 2 helpful constants. These are useful to retrieve correct return values for the | +| | | | task logic | +| | | | | +| | | | .. container:: | +| | | | | +| | | | .. container:: content | +| | | | | +| | | | .. container:: paragraph | +| | | | | +| | | | **Example:** | +| | | | | +| | | | .. code:: javascript | +| | | | | +| | | | var returnValue = executor.isTrue; | +| | | | var returnValueType = Java.type("java.lang.Boolean"); | +| | | | var returnValue = new returnValueType(true); | ++------------+-------------+--------------------------------+-------------------------------------------------------------------------------------+ +| subject | Task | TaskFacade | .. container:: paragraph | +| | | | | +| | | | This provides some useful information about the task that contains this task | +| | | | logic. This object has some useful fields and methods : | +| | | | | +| | | | .. container:: ulist | +| | | | | +| | | | - **AxTask task** to get access to the full task definition of | +| | | | the host task | +| | | | | +| | | | - **String getTaskName()** to get the name of the host task | +| | | | | +| | | | - **String getId()** to get the ID of the host task | +| | | | | +| | | | - **SchemaHelper getInFieldSchemaHelper( String fieldName )** to | +| | | | get a ``SchemaHelper`` helper object to manipulate incoming | +| | | | task fields in a schema-aware manner | +| | | | | +| | | | - **SchemaHelper getOutFieldSchemaHelper( String fieldName )** to | +| | | | get a ``SchemaHelper`` helper object to manipulate outgoing | +| | | | task fields in a schema-aware manner, e.g. to instantiate new | +| | | | schema-compliant field objects to populate the | +| | | | ``executor.outFields`` outgoing fields map | +| | | | | +| | | | .. container:: | +| | | | | +| | | | .. container:: content | +| | | | | +| | | | .. container:: paragraph | +| | | | | +| | | | **Example:** | +| | | | | +| | | | .. code:: javascript | +| | | | | +| | | | executor.logger.info("Task name: " | +| | | | +executor.subject.getTaskName()); | +| | | | executor.logger.info("Task id: " | +| | | | +executor.subject.getId()); | +| | | | executor.logger.info("Task inputs definitions: " | +| | | | +"executor.subject.task.getInputFieldSet()); | +| | | | executor.logger.info("Task outputs definitions: " | +| | | | +"executor.subject.task.getOutputFieldSet()); | +| | | | executor.outFields["authorised"] = executor.subject | +| | | | .getOutFieldSchemaHelper("authorised") | +| | | | .createNewInstance("false"); | ++------------+-------------+--------------------------------+-------------------------------------------------------------------------------------+ +| ContextAlbum getContextAlbum(String ctxtAlbumName ) | .. container:: paragraph | +| | | +| | A utility method to retrieve a ``ContextAlbum`` for use in the task. | +| | This is how you access the context used by the task. The returned | +| | ``ContextAlbum`` implements the ``java.util.Map <String,Object>`` | +| | interface to get and set context as appropriate. The returned | +| | ``ContextAlbum`` also has methods to lock context albums, get | +| | information about the schema of the items to be stored in a context | +| | album, and get a ``SchemaHelper`` to manipulate context album items. How | +| | to define and use context in a task is described in the Apex | +| | Programmer’s Guide and in the My First Apex Policy guide. | +| | | +| | .. container:: | +| | | +| | .. container:: content | +| | | +| | .. container:: paragraph | +| | | +| | **Example:** | +| | | +| | .. code:: javascript | +| | | +| | var bkey = executor.inFields.get("branch_ID"); | +| | var cnts = executor.getContextMap("BranchCounts"); | +| | cnts.lockForWriting(bkey); | +| | cnts.put(bkey, cnts.get(bkey) + 1); | +| | cnts.unlockForWriting(bkey); | ++------------+-------------+--------------------------------+-------------------------------------------------------------------------------------+ + +Writing APEX Task Selection Logic +--------------------------------- + + .. container:: paragraph + + The function of Task Selection Logic is to choose which task + should be executed for an Apex State as one of the steps in an + Apex Policy. Since each state must define a default task there is + no need for Task Selection Logic unless the state uses more than + one task. This logic can be specified in a number of ways, + exploiting Apex’s plug-in architecture to support a range of logic + executors. In Apex scripted Task Selection Logic can be written in + any of these languages: + + .. container:: ulist + + - ```MVEL`` <https://en.wikipedia.org/wiki/MVEL>`__, + + - ```JavaScript`` <https://en.wikipedia.org/wiki/JavaScript>`__, + + - ```JRuby`` <https://en.wikipedia.org/wiki/JRuby>`__ or + + - ```Jython`` <https://en.wikipedia.org/wiki/Jython>`__. + + .. container:: paragraph + + These languages were chosen because the scripts can be compiled + into Java bytecode at runtime and then efficiently executed + natively in the JVM. Task Selection Logic an also be written + directly in Java but needs to be compiled, with the resulting + classes added to the classpath. There are also a number of other + Task Selection Logic types but these are not supported as yet. + This guide will focus on the scripted Task Selection Logic + approaches, with MVEL and JavaScript being our favorite languages. + In particular this guide will focus on the Apex aspects of the + scripts. However, this guide does not attempt to teach you about + the scripting languages themselves … that is up to you! + + .. tip:: + JVM-based scripting languages + For more more information on Scripting for the Java platform see: + https://docs.oracle.com/javase/8/docs/technotes/guides/scripting/prog_guide/index.html + + .. note:: + What does Task Selection Logic do? + When an Apex state references multiple tasks, there must be a way to dynamically decide + which task should be chosen and executed. This can depend on the many factors, e.g. the + *incoming event for the state*, *shared state* or *context*, *external context*, + etc.. This is the function of a state’s Task Selection Logic. Obviously, if there is + only one task then Task only one task then Task Selection Logic is not needed. + Each state must also select one of the tasks a the *default state*. If the Task + Selection Logic is unable to select an appropriate task, then it should select the + *default task*. Once the task has been selected the Apex Engine will then execute that + task. + + .. container:: paragraph + + First lets start with some simple Task Selection Logic, drawn from + the "My First Apex Policy" example: The Task Selection Logic from + the "My First Apex Policy" example is specified in JavaScript + here: + + .. container:: listingblock + + .. container:: title + + Javascript code for the "My First Policy" Task Selection Logic + + .. container:: content + + .. code:: javascript + + /* + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + + + var returnValueType = Java.type("java.lang.Boolean"); + var returnValue = new returnValueType(true); + + executor.logger.info("Task Selection Execution: '"+executor.subject.id+ + "'. Input Event: '"+executor.inFields+"'"); + + branchid = executor.inFields.get("branch_ID"); + taskorig = executor.subject.getTaskKey("MorningBoozeCheck"); + taskalt = executor.subject.getTaskKey("MorningBoozeCheckAlt1"); + taskdef = executor.subject.getDefaultTaskKey(); + + if(branchid >=0 && branchid <1000){ + taskorig.copyTo(executor.selectedTask); + } + else if (branchid >=1000 && branchid <2000){ + taskalt.copyTo(executor.selectedTask); + } + else{ + taskdef.copyTo(executor.selectedTask); + } + + /* + This task selection logic selects task "MorningBoozeCheck" for branches with + 0<=branch_ID<1000 and selects task "MorningBoozeCheckAlt1" for branches with + 1000<=branch_ID<2000. Otherwise the default task is selected. + In this case the default task is also "MorningBoozeCheck" + */ + + .. container:: paragraph + + The role of the Task Selection Logic in this simple example is to + examine the value in one incoming field (``branchid``), then + depending on that field’s value set the value for the selected + task to the appropriate task (``MorningBoozeCheck``, + ``MorningBoozeCheckAlt1``, or the default task). + + .. container:: paragraph + + Another thing to notice is that Task Selection Logic should return + a ``java.lang.Boolean`` value ``true`` if the logic executed + correctly. If the logic fails for some reason then ``false`` can + be returned, but this will cause the policy invoking this task + will fail and exit. + + .. note:: + How to return a value from Task Selection Logic + Some languages explicitly support returning values from the script (e.g. MVEL and + JRuby) using an explicit return statement (e.g. ``return true``), other languages do not (e.g. + JavaScript and Jython). For languages that do not support the ``return`` statement, a special field called + ``returnValue`` must be created to hold the result of the task logic operation (i.e. assign a ``java.lang.Boolean`` + value to the ``returnValue`` field before completing the task). + Also, in MVEL if there is not explicit return statement then the return value of the last executed statement will + return (e.g. the statement a=(1+2) will return the value 3). + + .. container:: paragraph + + Each of the scripting languages used in Apex can import and use + standard Java libraries to perform complex tasks. Besides imported + classes and normal language features Apex provides some natively + available parameters and functions that can be used directly. At + run-time these parameters are populated by the Apex execution + environment and made natively available to logic scripts each time + the logic script is invoked. (These can be accessed using the + ``executor`` keyword for most languages, or can be accessed + directly without the ``executor`` keyword in MVEL): + + Table 2. The ``executor`` Fields / Methods + +-------------------------------------------------------+--------------------------------------------------------+ + | Unix, Cygwin | Windows | + +=======================================================+========================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: bash | .. code:: bash | + | :number-lines: | :number-lines: | + | | | + | >c: | # cd /usr/local/src/apex-pdp | + | >cd \dev\apex | # mvn clean install -DskipTest | + | >mvn clean install -DskipTests | | + +-------------------------------------------------------+--------------------------------------------------------+ + ++------------+-------------+--------------------------------+-------------------------------------------------------------------------------------+ +| Name | Type | Java type | Description | ++============+=============+================================+=====================================================================================+ +| inFields | Fields | java.util.Map <String,Object> | .. container:: paragraph | +| | | | | +| | | | All fields in the state’s incoming event. This is implemented as a standard Java | +| | | | Java (unmodifiable) Map | +| | | | | +| | | | .. container:: | +| | | | | +| | | | .. container:: content | +| | | | | +| | | | .. container:: paragraph | +| | | | | +| | | | **Example:** | +| | | | | +| | | | .. code:: javascript | +| | | | | +| | | | executor.logger.debug("Incoming fields: " | +| | | | +executor.inFields.entrySet()); | +| | | | var item_id = executor.incomingFields["item_ID"]; | +| | | | if (item_id >=1000) { ... } | ++------------+-------------+--------------------------------+-------------------------------------------------------------------------------------+ +| outFields | Fields | java.util.Map <String,Object> | .. container:: paragraph | +| | | | | +| | | | The outgoing task fields. This is implemented as a standard initially empty Java | +| | | | (modifiable) Map. To create a new schema-compliant instance of a field object | +| | | | see the utility method subject.getOutFieldSchemaHelper() below | +| | | | | +| | | | .. container:: | +| | | | | +| | | | .. container:: content | +| | | | | +| | | | .. container:: paragraph | +| | | | | +| | | | **Example:** | +| | | | | +| | | | .. code:: javascript | +| | | | | +| | | | executor.outFields["authorised"] = false; | ++------------+-------------+--------------------------------+-------------------------------------------------------------------------------------+ +| logger | Logger | org.slf4j.ext.XLogger | .. container:: paragraph | +| | | | | +| | | | A helpful logger | +| | | | | +| | | | .. container:: | +| | | | | +| | | | .. container:: content | +| | | | | +| | | | .. container:: paragraph | +| | | | | +| | | | **Example:** | +| | | | | +| | | | .. code:: javascript | +| | | | | +| | | | executor.logger.info("Executing task: " | +| | | | +executor.subject.id); | ++------------+-------------+--------------------------------+-------------------------------------------------------------------------------------+ +| TRUE/FALSE | boolean | java.lang.Boolean | .. container:: paragraph | +| | | | | +| | | | 2 helpful constants. These are useful to retrieve correct return values for the | +| | | | task logic | +| | | | | +| | | | .. container:: | +| | | | | +| | | | .. container:: content | +| | | | | +| | | | .. container:: paragraph | +| | | | | +| | | | **Example:** | +| | | | | +| | | | .. code:: javascript | +| | | | | +| | | | var returnValue = executor.isTrue; | +| | | | var returnValueType = Java.type("java.lang.Boolean"); | +| | | | var returnValue = new returnValueType(true); | ++------------+-------------+--------------------------------+-------------------------------------------------------------------------------------+ +| subject | Task | TaskFacade | .. container:: paragraph | +| | | | | +| | | | This provides some useful information about the task that contains this task | +| | | | logic. This object has some useful fields and methods : | +| | | | | +| | | | .. container:: ulist | +| | | | | +| | | | - **AxTask task** to get access to the full task definition of | +| | | | the host task | +| | | | | +| | | | - **String getTaskName()** to get the name of the host task | +| | | | | +| | | | - **String getId()** to get the ID of the host task | +| | | | | +| | | | - **SchemaHelper getInFieldSchemaHelper( String fieldName )** to | +| | | | get a ``SchemaHelper`` helper object to manipulate incoming | +| | | | task fields in a schema-aware manner | +| | | | | +| | | | - **SchemaHelper getOutFieldSchemaHelper( String fieldName )** to | +| | | | get a ``SchemaHelper`` helper object to manipulate outgoing | +| | | | task fields in a schema-aware manner, e.g. to instantiate new | +| | | | schema-compliant field objects to populate the | +| | | | ``executor.outFields`` outgoing fields map | +| | | | | +| | | | .. container:: | +| | | | | +| | | | .. container:: content | +| | | | | +| | | | .. container:: paragraph | +| | | | | +| | | | **Example:** | +| | | | | +| | | | .. code:: javascript | +| | | | | +| | | | executor.logger.info("Task name: " | +| | | | +executor.subject.getTaskName()); | +| | | | executor.logger.info("Task id: " | +| | | | +executor.subject.getId()); | +| | | | executor.logger.info("Task inputs definitions: " | +| | | | +"executor.subject.task.getInputFieldSet()); | +| | | | executor.logger.info("Task outputs definitions: " | +| | | | +"executor.subject.task.getOutputFieldSet()); | +| | | | executor.outFields["authorised"] = executor.subject | +| | | | .getOutFieldSchemaHelper("authorised") | +| | | | .createNewInstance("false"); | ++------------+-------------+--------------------------------+-------------------------------------------------------------------------------------+ +| ContextAlbum getContextAlbum(String ctxtAlbumName ) | .. container:: paragraph | +| | | +| | A utility method to retrieve a ``ContextAlbum`` for use in the task. | +| | This is how you access the context used by the task. The returned | +| | ``ContextAlbum`` implements the ``java.util.Map <String,Object>`` | +| | interface to get and set context as appropriate. The returned | +| | ``ContextAlbum`` also has methods to lock context albums, get | +| | information about the schema of the items to be stored in a context | +| | album, and get a ``SchemaHelper`` to manipulate context album items. How | +| | to define and use context in a task is described in the Apex | +| | Programmer’s Guide and in the My First Apex Policy guide. | +| | | +| | .. container:: | +| | | +| | .. container:: content | +| | | +| | .. container:: paragraph | +| | | +| | **Example:** | +| | | +| | .. code:: javascript | +| | | +| | var bkey = executor.inFields.get("branch_ID"); | +| | var cnts = executor.getContextMap("BranchCounts"); | +| | cnts.lockForWriting(bkey); | +| | cnts.put(bkey, cnts.get(bkey) + 1); | +| | cnts.unlockForWriting(bkey); | ++------------+-------------+--------------------------------+-------------------------------------------------------------------------------------+ + +Logic Cheatsheet +---------------- + + .. container:: paragraph + + Examples given here use Javascript (if not stated otherwise), + other execution environments will be similar. + +Add Nashorn +########### + + .. container:: paragraph + + First line in the logic use this import. + + .. container:: listingblock + + .. container:: title + + JS Nashorn + + .. container:: content + + .. code:: javascript + + load("nashorn:mozilla_compat.js"); + +Finish Logic with Success or Error +################################## + + .. container:: paragraph + + To finish logic, i.e. return to APEX, with success use the + following lines close to the end of the logic. + + .. container:: listingblock + + .. container:: title + + JS Success + + .. container:: content + + .. code:: javascript + + var returnValueType = Java.type("java.lang.Boolean"); + var returnValue = new returnValueType(true); + + .. container:: paragraph + + To notify a problem, finish with an error. + + .. container:: listingblock + + .. container:: title + + JS Fail + + .. container:: content + + .. code:: javascript + + var returnValueType = Java.type("java.lang.Boolean"); + var returnValue = new returnValueType(false); + +Logic Logging +############# + + .. container:: paragraph + + Logging can be made easy using a local variable for the logger. + Line 1 below does that. Then we start with a trace log with the + task (or task logic) identifier followed by the infields. + + .. container:: listingblock + + .. container:: title + + JS Logging + + .. container:: content + + .. code:: javascript + + var logger = executor.logger; + logger.trace("start: " + executor.subject.id); + logger.trace("-- infields: " + executor.inFields); + + .. container:: paragraph + + For larger logging blocks you can use the standard logging API + to detect log levels, for instance: + + .. container:: listingblock + + .. container:: title + + JS Logging Blocks + + .. container:: content + + .. code:: javascript + + if(logger.isTraceEnabled()){ + // trace logging block here + } + + .. container:: paragraph + + Note: the shown logger here logs to + ``org.onap.policy.apex.executionlogging``. The behavior of the + actual logging can be specified in the + ``$APEX_HOME/etc/logback.xml``. + + .. container:: paragraph + + If you want to log into the APEX root logger (which is + sometimes necessary to report serious logic errors to the top), + then import the required class and use this logger. + + .. container:: listingblock + + .. container:: title + + JS Root Logger + + .. container:: content + + .. code:: javascript + + importClass(org.slf4j.LoggerFactory); + var rootLogger = LoggerFactory.getLogger(logger.ROOT_LOGGER_NAME); + + rootLogger.error("Serious error in logic detected: " + executor.subject.id); + +Local Variable for Infields +########################### + + .. container:: paragraph + + It is a good idea to use local variables for ``infields``. This + avoids long code lines and policy evolution. The following + example assumes infields named ``nodeName`` and ``nodeAlias``. + + .. container:: listingblock + + .. container:: title + + JS Infields Local Var + + .. container:: content + + .. code:: javascript + + var ifNodeName = executor.inFields["nodeName"]; + var ifNodeAlias = executor.inFields["nodeAlias"]; + +Local Variable for Context Albums +################################# + + .. container:: paragraph + + Similar to the ``infields`` it is good practice to use local + variables for context albums as well. The following example + assumes that a task can access a context album + ``albumTopoNodes``. The second line gets a particular node from + this context album. + + .. container:: listingblock + + .. container:: title + + JS Infields Local Var + + .. container:: content + + .. code:: javascript + + var albumTopoNodes = executor.getContextAlbum("albumTopoNodes"); + var ctxtNode = albumTopoNodes.get(ifNodeName); + +Set Outfields in Logic +###################### + + .. container:: paragraph + + The task logic needs to set outfields with content generated. + The exception are outfields that are a direct copy from an + infield of the same name, APEX does that autmatically. + + .. container:: listingblock + + .. container:: title + + JS Set Outfields + + .. container:: content + + .. code:: javascript + + executor.outFields["report"] = "node ctxt :: added node " + ifNodeName; + +Create a instance of an Outfield using Schemas +############################################## + + .. container:: paragraph + + If an outfield is not an atomic type (string, integer, etc.) + but uses a complex schema (with a Java or Avro backend), APEX + can help to create new instances. The ``executor`` provides a + field called ``subject``, which provides a schem helper with an + API for this. The complete API of the schema helper is + documented here: `API Doc: + SchemaHelper <https://ericsson.github.io/apex-docs/javadocs/index.html>`__. + + .. container:: paragraph + + If the backend is Avro, then an import of the Avro schema + library is required: + + .. container:: listingblock + + .. container:: title + + JS Import Avro + + .. container:: content + + .. code:: javascript + + importClass(org.apache.avro.generic.GenericData.Array); + importClass(org.apache.avro.generic.GenericRecord); + importClass(org.apache.avro.Schema); + + .. container:: paragraph + + If the backend is Java, then the Java class implementing the + schema needs to be imported. + + .. container:: paragraph + + The following example assumes an outfield ``situation``. The + ``subject`` method ``getOutFieldSchemaHelper()`` is used to + create a new instance. + + .. container:: listingblock + + .. container:: title + + JS Outfield Instance with Schema + + .. container:: content + + .. code:: javascript + + var situation = executor.subject.getOutFieldSchemaHelper("situation").createNewInstance(); + + .. container:: paragraph + + If the schema backend is Java, the new instance will be as + implemented in the Java class. If the schema backend is Avro, + the new instance will have all fields from the Avro schema + specification, but set to ``null``. So any entry here needs to + be done separately. For instance, the ``situation`` schema has + a field ``problemID`` which we set. + + .. container:: listingblock + + .. container:: title + + JS Outfield Instance with Schema, set + + .. container:: content + + .. code:: javascript + + situation.put("problemID", "my-problem"); + +Create a instance of an Context Album entry using Schemas +######################################################### + + .. container:: paragraph + + Context album instances can be created using very similar to + the outfields. Here, the schema helper comes from the context + album directly. The API of the schema helper is the same as for + outfields, see `API Doc: + SchemaHelper <https://ericsson.github.io/apex-docs/javadocs/index.html>`__. + + .. container:: paragraph + + If the backend is Avro, then an import of the Avro schema + library is required: + + .. container:: listingblock + + .. container:: title + + JS Import Avro + + .. container:: content + + .. code:: javascript + + importClass(org.apache.avro.generic.GenericData.Array); + importClass(org.apache.avro.generic.GenericRecord); + importClass(org.apache.avro.Schema); + + .. container:: paragraph + + If the backend is Java, then the Java class implementing the + schema needs to be imported. + + .. container:: paragraph + + The following example creates a new instance of a context album + instance named ``albumProblemMap``. + + .. container:: listingblock + + .. container:: title + + JS Outfield Instance with Schema + + .. container:: content + + .. code:: javascript + + var albumProblemMap = executor.getContextAlbum("albumProblemMap"); + var linkProblem = albumProblemMap.getSchemaHelper().createNewInstance(); + + .. container:: paragraph + + This can of course be also done in a single call without the + local variable for the context album. + + .. container:: listingblock + + .. container:: title + + JS Outfield Instance with Schema, one line + + .. container:: content + + .. code:: javascript + + var linkProblem = executor.getContextAlbum("albumProblemMap").getSchemaHelper().createNewInstance(); + + .. container:: paragraph + + If the schema backend is Java, the new instance will be as + implemented in the Java class. If the schema backend is Avro, + the new instance will have all fields from the Avro schema + specification, but set to ``null``. So any entry here needs to + be done separately (see above in outfields for an example). + +Enumerates +########## + + .. container:: paragraph + + When dealing with enumerates (Avro or Java defined), it is + sometimes and in some execution environments necessary to + convert them to a string. For example, assume an Avro enumerate + schema as: + + .. container:: listingblock + + .. container:: title + + Avro Enumerate Schema + + .. container:: content + + .. code:: javascript + + { + "type": "enum", + "name": "Status", + "symbols" : [ + "UP", + "DOWN" + ] + } + + .. container:: paragraph + + Using a switch over a field initialized with this enumerate in + Javascript will fail. Instead, use the ``toString`` method, for + example: + + .. container:: listingblock + + .. container:: title + + JS Outfield Instance with Schema, one line + + .. container:: content + + .. code:: javascript + + var switchTest = executor.inFields["status"]; + switch(switchTest.toString()){ + case "UP": ...; break; + case "DOWN": ...; break; + default: ...; + } + +MVEL Initialize Outfields First! +################################ + + .. container:: paragraph + + In MVEL, we observed a problem when accessing (setting) + outfields without a prior access to them. So in any MVEL task + logic, before setting any outfield, simply do a get (with any + string), to load the outfields into the MVEL cache. + + .. container:: listingblock + + .. container:: title + + MVEL Outfield Initialization + + .. container:: content + + .. code:: javascript + + outFields.get("initialize outfields"); + +Using Java in Scripting Logic +############################# + + .. container:: paragraph + + Since APEX executes the logic inside a JVM, most scripting + languages provide access to all standard Java classes. Simply + add an import for the required class and then use it as in + actual Java. + + .. container:: paragraph + + The following example imports ``java.util.arraylist`` into a + Javascript logic, and then creates a new list. + + .. container:: listingblock + + .. container:: title + + JS Import ArrayList + + .. container:: content + + .. code:: javascript + + importClass(java.util.ArrayList); + var myList = new ArrayList(); + +Policy Examples +^^^^^^^^^^^^^^^ + +My First Policy +--------------- + + .. container:: paragraph + + A good starting point is the ``My First Policy`` example. It + describes a sales problem, to which policy can be applied. + The example details the policy background, shows how to use + the REST Editor to create a policy, and provides details for + running the policies. The documentation can be found: + + .. container:: ulist + + - `My-First-Policy on the APEX + site <https://ericsson.github.io/apex-docs/modules/examples/examples-myfirstpolicy/MyFirstPolicyHowto.html>`__ + + - `Stand-alone + HTML <https://ericsson.github.io/apex-docs/docs-apex/html/HowTo-MyFirstPolicy.html>`__ + + - `Stand-alone + PDF <https://ericsson.github.io/apex-docs/docs-apex/pdf/HowTo-MyFirstPolicy.pdf>`__ + +VPN SLA +------- + + .. container:: paragraph + + The domain Policy-controlled Video Streaming (PCVS) contains + a policy for controlling video streams with different + strategies. It also provides details for installing an + actual testbed with off-the-shelve software (Mininet, + Floodlight, Kafka, Zookeeper). The policy model here + demonstrates virtually all APEX features: local context and + policies controlling it, task selection logic and multiple + tasks in a single state, AVRO schemas for context, AVOR + schemas for events (trigger and local), and a CLI editor + specification of the policy. The documentation can be found: + + .. container:: ulist + + - `VPN SLA Policy on the APEX + site <https://ericsson.github.io/apex-docs/modules/examples/examples-pcvs/vpnsla/policy.html>`__ + +Decision Maker +-------------- + + .. container:: paragraph + + The domain Decision Maker shows a very simple policy for + decisions. Interesting here is that the it creates a Docker + image to run the policy and that it uses the APEX REST + applications to update the policy on the-fly. It also has + local context to remember past decisions, and shows how to + use that to no make the same decision twice in a row. The + documentation can be found: + + .. container:: ulist + + - `Decision Maker on APEX + site <https://ericsson.github.io/apex-docs/modules/examples/examples-decisionmaker/index.html>`__ + +.. container:: + :name: footer + + .. container:: + :name: footer-text + + 2.0.0-SNAPSHOT + Last updated 2018-09-04 16:04:24 IST + +.. |APEX Policy Matrix| image:: images/apex-intro/ApexPolicyMatrix.png +.. |APEX Policy Model for Execution| image:: images/apex-policy-model/UmlPolicyModels.png +.. |Concepts and Keys| image:: images/apex-policy-model/ConceptsKeys.png + diff --git a/docs/apex/APEX-User-Manual.rst b/docs/apex/APEX-User-Manual.rst new file mode 100644 index 00000000..01f74fab --- /dev/null +++ b/docs/apex/APEX-User-Manual.rst @@ -0,0 +1,8071 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 + + +APEX User Manual +**************** + +.. contents:: + :depth: 3 + +Installation +^^^^^^^^^^^^ + +Requirements +------------ + + .. container:: paragraph + + APEX is 100% written in Java and runs on any platform + that supports a JVM, e.g. Windows, Unix, Cygwin. Some + APEX applications (such as the monitoring application) + come as web archives, they do require a war-capable web + server installed. + +Installation Requirements +######################### + + .. container:: ulist + + - Downloaded distribution: JAVA runtime environment + (JRE, Java 8 or later, APEX is tested with the + Oracle Java) + + - Building from source: JAVA development kit (JDK, + Java 8 or later, APEX is tested with the Oracle + Java) + + - A web archive capable webserver, for instance for + the monitoring application + + .. container:: ulist + + - for instance `Apache + Tomcat <https://tomcat.apache.org/>`__ + + - Sufficient rights to install APEX on the system + + - Installation tools depending on the installation + method used: + + .. container:: ulist + + - ZIP to extract from a ZIP distribution + + .. container:: ulist + + - Windows for instance + `7Zip <http://www.7-zip.org/>`__ + + - TAR and GZ to extract from that TAR.GZ + distribution + + .. container:: ulist + + - Windows for instance + `7Zip <http://www.7-zip.org/>`__ + + - RPM to install from the RPM distribution + + .. container:: ulist + + - Install: ``sudo apt-get install rpm`` + + - DPKG to install from the DEB distribution + + .. container:: ulist + + - Install: ``sudo apt-get install dpkg`` + +Feature Requirements +#################### + + .. container:: paragraph + + APEX supports a number of features that require extra + software being installed. + + .. container:: ulist + + - `Apache Kafka <https://kafka.apache.org/>`__ to + connect APEX to a Kafka message bus + + - `Hazelcast <https://hazelcast.com/>`__ to use + distributed hash maps for context + + - `Infinispan <http://infinispan.org/>`__ for + distributed context and persistence + + - `Docker <https://www.docker.com/>`__ to run APEX + inside a Docker container + +Build (Install from Source) Requirements +######################################## + + .. container:: paragraph + + Installation from source requires a few development + tools + + .. container:: ulist + + - GIT to retrieve the source code + + - Java SDK, Java version 8 or later + + - Apache Maven 3 (the APEX build environment) + +Get the APEX Source Code +------------------------ + + .. container:: paragraph + + The first APEX source code was hosted on Github in + January 2018. By the end of 2018, APEX was added as a + project in the ONAP Policy Framework, released later in + the ONAP Casablanca release. + + .. container:: paragraph + + The APEX source code is hosted in ONAP as project APEX. + The current stable version is in the master branch. + Simply clone the master branch from ONAP using HTTPS. + + .. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + git clone https://gerrit.onap.org/r/policy/apex-pdp + +Build APEX +---------- + + .. container:: paragraph + + The examples in this document assume that the APEX source + repositories are cloned to: + + .. container:: ulist + + - Unix, Cygwin: ``/usr/local/src/apex-pdp`` + + - Windows: ``C:\dev\apex-pdp`` + + - Cygwin: ``/cygdrive/c/dev/apex-pdp`` + + .. important:: + A Build requires ONAP Nexus + APEX has a dependency to ONAP parent projects. You might need to adjust your Maven M2 settings. The most current + settings can be found in the ONAP oparent repo: `Settings <https://git.onap.org/oparent/plain/settings.xml>`__. + + .. important:: + A Build needs Space + Building APEX requires approximately 2-3 GB of hard disc space, 1 GB for the actual build with full + distribution and 1-2 GB for the downloaded dependencies + + .. important:: + A Build requires Internet (for first build) + During the build, several (a lot) of Maven dependencies will be downloaded and stored in the configured local Maven + repository. The first standard build (and any first specific build) requires Internet access to download those + dependencies. + + .. important:: + Building RPM distributions + RPM images are only build if the ``rpm`` package is installed (Unix). To install ``rpm`` run ``sudo apt-get install rpm``, + then build APEX. + + .. container:: paragraph + + Use Maven to for a standard build without any tests. + + +-------------------------------------------------------+--------------------------------------------------------+ + | Unix, Cygwin | Windows | + +=======================================================+========================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: | .. code:: | + | :number-lines: | :number-lines: | + | | | + | # cd /usr/local/src/apex-pdp | >c: | + | # mvn clean install -DskipTest | >cd \dev\apex | + | | >mvn clean install -DskipTests | + +-------------------------------------------------------+--------------------------------------------------------+ + +.. container:: paragraph + + The build takes 2-3 minutes on a standard development laptop. It + should run through without errors, but with a lot of messages from + the build process. + +.. container:: paragraph + + When Maven is finished with the build, the final screen should look + similar to this (omitting some ``success`` lines): + +.. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + [INFO] tools .............................................. SUCCESS [ 0.248 s] + [INFO] tools-common ....................................... SUCCESS [ 0.784 s] + [INFO] simple-wsclient .................................... SUCCESS [ 3.303 s] + [INFO] model-generator .................................... SUCCESS [ 0.644 s] + [INFO] packages ........................................... SUCCESS [ 0.336 s] + [INFO] apex-pdp-package-full .............................. SUCCESS [01:10 min] + [INFO] Policy APEX PDP - Docker build 2.0.0-SNAPSHOT ...... SUCCESS [ 10.307 s] + [INFO] ------------------------------------------------------------------------ + [INFO] BUILD SUCCESS + [INFO] ------------------------------------------------------------------------ + [INFO] Total time: 03:43 min + [INFO] Finished at: 2018-09-03T11:56:01+01:00 + [INFO] ------------------------------------------------------------------------ + +.. container:: paragraph + + The build will have created all artifacts required for an APEX + installation. The following example show how to change to the target + directory and how it should look like. + ++----------------------------------------------------------------------------------------------------------------------------+ +| Unix, Cygwin | ++============================================================================================================================+ +| .. container:: | +| | +| .. container:: listingblock | +| | +| .. container:: content | +| | +| .. code:: | +| :number-lines: | +| | +| -rwxrwx---+ 1 esvevan Domain Users 772 Sep 3 11:55 apex-pdp-package-full_2.0.0~SNAPSHOT_all.changes* | +| -rwxrwx---+ 1 esvevan Domain Users 146328082 Sep 3 11:55 apex-pdp-package-full-2.0.0-SNAPSHOT.deb* | +| -rwxrwx---+ 1 esvevan Domain Users 15633 Sep 3 11:54 apex-pdp-package-full-2.0.0-SNAPSHOT.jar* | +| -rwxrwx---+ 1 esvevan Domain Users 146296819 Sep 3 11:55 apex-pdp-package-full-2.0.0-SNAPSHOT-tarball.tar.gz* | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 archive-tmp/ | +| -rwxrwx---+ 1 esvevan Domain Users 89 Sep 3 11:54 checkstyle-cachefile* | +| -rwxrwx---+ 1 esvevan Domain Users 10621 Sep 3 11:54 checkstyle-checker.xml* | +| -rwxrwx---+ 1 esvevan Domain Users 584 Sep 3 11:54 checkstyle-header.txt* | +| -rwxrwx---+ 1 esvevan Domain Users 86 Sep 3 11:54 checkstyle-result.xml* | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 classes/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 dependency-maven-plugin-markers/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 etc/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 examples/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:55 install_hierarchy/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 maven-archiver/ | ++----------------------------------------------------------------------------------------------------------------------------+ + ++--------------------------------------------------------------------------------------------------------+ +| Windows | ++========================================================================================================+ +| .. container:: | +| | +| .. container:: listingblock | +| | +| .. container:: content | +| | +| .. code:: | +| :number-lines: | +| | +| 03/09/2018 11:55 <DIR> . | +| 03/09/2018 11:55 <DIR> .. | +| 03/09/2018 11:55 146,296,819 apex-pdp-package-full-2.0.0-SNAPSHOT-tarball.tar.gz | +| 03/09/2018 11:55 146,328,082 apex-pdp-package-full-2.0.0-SNAPSHOT.deb | +| 03/09/2018 11:54 15,633 apex-pdp-package-full-2.0.0-SNAPSHOT.jar | +| 03/09/2018 11:55 772 apex-pdp-package-full_2.0.0~SNAPSHOT_all.changes | +| 03/09/2018 11:54 <DIR> archive-tmp | +| 03/09/2018 11:54 89 checkstyle-cachefile | +| 03/09/2018 11:54 10,621 checkstyle-checker.xml | +| 03/09/2018 11:54 584 checkstyle-header.txt | +| 03/09/2018 11:54 86 checkstyle-result.xml | +| 03/09/2018 11:54 <DIR> classes | +| 03/09/2018 11:54 <DIR> dependency-maven-plugin-markers | +| 03/09/2018 11:54 <DIR> etc | +| 03/09/2018 11:54 <DIR> examples | +| 03/09/2018 11:55 <DIR> install_hierarchy | +| 03/09/2018 11:54 <DIR> maven-archiver | +| 8 File(s) 292,652,686 bytes | +| 9 Dir(s) 14,138,720,256 bytes free | ++--------------------------------------------------------------------------------------------------------+ + +Install APEX +------------ + + .. container:: paragraph + + APEX can be installed in different ways: + + .. container:: ulist + + - Unix: automatically using ``rpm`` or ``dpkg`` from ``.rpm`` or + ``.deb`` archive + + - Windows, Unix, Cygwin: manually from a ``.tar.gz`` archive + + - Windows, Unix, Cygwin: build from source using Maven, then + install manually + +Install with RPM and DPKG +######################### + + .. container:: paragraph + + The install distributions of APEX automatically install the + system. The installation directory is + ``/opt/app/policy/apex-pdp``. Log files are located in + ``/var/log/onap/policy/apex-pdp``. The latest APEX version will + be available as ``/opt/app/policy/apex-pdp/apex-pdp``. + + .. container:: paragraph + + For the installation, a new user ``apexuser`` and a new group + ``apexuser`` will be created. This user owns the installation + directories and the log file location. The user is also used by + the standard APEX start scripts to run APEX with this user’s + permissions. + + +-----------------------------------------------------------------------+ + | RPM Installation | + +=======================================================================+ + | .. container:: | + | | + | .. container:: listingblock | + | | + | .. container:: content | + | | + | .. code:: | + | :number-lines: | + | | + | # sudo rpm -i apex-pdp-package-full-2.0.0-SNAPSHOT.rpm | + | ********************preinst******************* | + | arguments 1 | + | ********************************************** | + | creating group apexuser . . . | + | creating user apexuser . . . | + | ********************postinst**************** | + | arguments 1 | + | *********************************************** | + +-----------------------------------------------------------------------+ + ++--------------------------------------------------------------------------------------+ +| DPKG Installation | ++======================================================================================+ +| .. container:: | +| | +| .. container:: listingblock | +| | +| .. container:: content | +| | +| .. code:: | +| :number-lines: | +| | +| # sudo dpkg -i apex-pdp-package-full-2.0.0-SNAPSHOT.deb | +| Selecting previously unselected package apex-uservice. | +| (Reading database ... 288458 files and directories currently installed.) | +| Preparing to unpack apex-pdp-package-full-2.0.0-SNAPSHOT.deb ... | +| ********************preinst******************* | +| arguments install | +| ********************************************** | +| creating group apexuser . . . | +| creating user apexuser . . . | +| Unpacking apex-uservice (2.0.0-SNAPSHOT) ... | +| Setting up apex-uservice (2.0.0-SNAPSHOT) ... | +| ********************postinst**************** | +| arguments configure | +| *********************************************** | ++--------------------------------------------------------------------------------------+ + +.. container:: paragraph + + Once the installation is finished, APEX is fully installed and ready + to run. + +Install Manually from Archive (Unix, Cygwin) +############################################ + + .. container:: paragraph + + Download a ``tar.gz`` archive. Create a directory where APEX + should be installed. Extract the ``tar`` archive. The following + example shows how to install APEX in ``/opt/apex`` and create a + link to ``/opt/apex/apex`` for the most recent installation. + + .. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + # cd /opt + # mkdir apex + # cd apex + # mkdir apex-full-2.0.0-SNAPSHOT + # tar xvfz ~/Downloads/apex-pdp-package-full-2.0.0-SNAPSHOT.tar.gz -C apex-full-2.0.0-SNAPSHOT + # ln -s apex apex-pdp-package-full-2.0.0-SNAPSHOT + +Install Manually from Archive (Windows, 7Zip, GUI) +################################################## + + .. container:: paragraph + + Download a ``tar.gz`` archive and copy the file into the install + folder (in this example ``C:\apex``). Assuming you are using 7Zip, + right click on the file and extract the ``tar`` archive. Note: the + screenshots might show an older version than you have. + + .. container:: imageblock + + .. container:: content + + |Extract the TAR archive| + + .. container:: paragraph + + The right-click on the new created TAR file and extract the actual + APEX distribution. + + .. container:: imageblock + + .. container:: content + + |Extract the APEX distribution| + + .. container:: paragraph + + Inside the new APEX folder you see the main directories: ``bin``, + ``etc``, ``examples``, ``lib``, and ``war`` + + .. container:: paragraph + + Once extracted, please rename the created folder to + ``apex-full-2.0.0-SNAPSHOT``. This will keep the directory name in + line with the rest of this documentation. + +Install Manually from Archive (Windows, 7Zip, CMD) +################################################## + + .. container:: paragraph + + Download a ``tar.gz`` archive and copy the file into the install + folder (in this example ``C:\apex``). Start ``cmd``, for instance + typing ``Windows+R`` and then ``cmd`` in the dialog. Assuming + ``7Zip`` is installed in the standard folder, simply run the + following commands (for APEX version 2.0.0-SNAPSHOT full + distribution) + + .. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + >c: + >cd \apex + >"\Program Files\7-Zip\7z.exe" x apex-pdp-package-full-2.0.0-SNAPSHOT.tar.gz -so | "\Program Files\7-Zip\7z.exe" x -aoa -si -ttar -o"apex-full-2.0.0-SNAPSHOT" + +.. container:: paragraph + + APEX is now installed in the folder + ``C:\apex\apex-full-2.0.0-SNAPSHOT``. + +Build from Source +----------------- + +Build and Install Manually (Unix, Windows, Cygwin) +################################################## + + .. container:: paragraph + + Clone the APEX GIT repositories into a directory. Go to that + directory. Use Maven to build APEX (all details on building + APEX from source can be found in *APEX HowTo: Build*). Install + from the created artifacts (``rpm``, ``deb``, ``tar.gz``, or + copying manually). + + .. important:: + Building RPM distributions + RPM images are only build if the ``rpm`` package is installed (Unix). To install ``rpm`` run + ``sudo apt-get install rpm``, then build APEX. + + .. container:: paragraph + + The following example shows how to build the APEX system, + without tests (``-DskipTests``) to safe some time. It assumes + that the APX GIT repositories are cloned to: + + .. container:: ulist + + - Unix, Cygwin: ``/usr/local/src/apex`` + + - Windows: ``C:\dev\apex`` + + +-------------------------------------------------------+--------------------------------------------------------+ + | Unix, Cygwin | Windows | + +=======================================================+========================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: | .. code:: | + | :number-lines: | :number-lines: | + | | | + | # cd /usr/local/src/apex | >c: | + | # mvn clean install -DskipTests | >cd \dev\apex | + | | >mvn clean install -DskipTests | + +-------------------------------------------------------+--------------------------------------------------------+ + +.. container:: paragraph + + The build takes about 2 minutes without test and about 4-5 minutes + with tests on a standard development laptop. It should run through + without errors, but with a lot of messages from the build process. If + build with tests (i.e. without ``-DskipTests``), there will be error + messages and stack trace prints from some tests. This is normal, as + long as the build finishes successful. + +.. container:: paragraph + + When Maven is finished with the build, the final screen should look + similar to this (omitting some ``success`` lines): + +.. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + [INFO] tools .............................................. SUCCESS [ 0.248 s] + [INFO] tools-common ....................................... SUCCESS [ 0.784 s] + [INFO] simple-wsclient .................................... SUCCESS [ 3.303 s] + [INFO] model-generator .................................... SUCCESS [ 0.644 s] + [INFO] packages ........................................... SUCCESS [ 0.336 s] + [INFO] apex-pdp-package-full .............................. SUCCESS [01:10 min] + [INFO] Policy APEX PDP - Docker build 2.0.0-SNAPSHOT ...... SUCCESS [ 10.307 s] + [INFO] ------------------------------------------------------------------------ + [INFO] BUILD SUCCESS + [INFO] ------------------------------------------------------------------------ + [INFO] Total time: 03:43 min + [INFO] Finished at: 2018-09-03T11:56:01+01:00 + [INFO] ------------------------------------------------------------------------ + +.. container:: paragraph + + The build will have created all artifacts required for an APEX + installation. The following example show how to change to the target + directory and how it should look like. + ++-----------------------------------------------------------------------------------------------------------------------------+ +| Unix, Cygwin | ++=============================================================================================================================+ +| .. container:: | +| | +| .. container:: listingblock | +| | +| .. code:: | +| :number-lines: | +| | +| # cd packages/apex-pdp-package-full/target | +| # ls -l | +| -rwxrwx---+ 1 esvevan Domain Users 772 Sep 3 11:55 apex-pdp-package-full_2.0.0~SNAPSHOT_all.changes* | +| -rwxrwx---+ 1 esvevan Domain Users 146328082 Sep 3 11:55 apex-pdp-package-full-2.0.0-SNAPSHOT.deb* | +| -rwxrwx---+ 1 esvevan Domain Users 15633 Sep 3 11:54 apex-pdp-package-full-2.0.0-SNAPSHOT.jar* | +| -rwxrwx---+ 1 esvevan Domain Users 146296819 Sep 3 11:55 apex-pdp-package-full-2.0.0-SNAPSHOT-tarball.tar.gz* | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 archive-tmp/ | +| -rwxrwx---+ 1 esvevan Domain Users 89 Sep 3 11:54 checkstyle-cachefile* | +| -rwxrwx---+ 1 esvevan Domain Users 10621 Sep 3 11:54 checkstyle-checker.xml* | +| -rwxrwx---+ 1 esvevan Domain Users 584 Sep 3 11:54 checkstyle-header.txt* | +| -rwxrwx---+ 1 esvevan Domain Users 86 Sep 3 11:54 checkstyle-result.xml* | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 classes/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 dependency-maven-plugin-markers/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 etc/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 examples/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:55 install_hierarchy/ | +| drwxrwx---+ 1 esvevan Domain Users 0 Sep 3 11:54 maven-archiver/ | ++-----------------------------------------------------------------------------------------------------------------------------+ + ++-----------------------------------------------------------------------------------------------------------------------------+ +| Windows | ++=============================================================================================================================+ +| .. container:: | +| | +| .. container:: listingblock | +| | +| .. code:: | +| :number-lines: | +| | +| >cd packages\apex-pdp-package-full\target | +| >dir | +| 03/09/2018 11:55 <DIR> . | +| 03/09/2018 11:55 <DIR> .. | +| 03/09/2018 11:55 146,296,819 apex-pdp-package-full-2.0.0-SNAPSHOT-tarball.tar.gz | +| 03/09/2018 11:55 146,328,082 apex-pdp-package-full-2.0.0-SNAPSHOT.deb | +| 03/09/2018 11:54 15,633 apex-pdp-package-full-2.0.0-SNAPSHOT.jar | +| 03/09/2018 11:55 772 apex-pdp-package-full_2.0.0~SNAPSHOT_all.changes | +| 03/09/2018 11:54 <DIR> archive-tmp | +| 03/09/2018 11:54 89 checkstyle-cachefile | +| 03/09/2018 11:54 10,621 checkstyle-checker.xml | +| 03/09/2018 11:54 584 checkstyle-header.txt | +| 03/09/2018 11:54 86 checkstyle-result.xml | +| 03/09/2018 11:54 <DIR> classes | +| 03/09/2018 11:54 <DIR> dependency-maven-plugin-markers | +| 03/09/2018 11:54 <DIR> etc | +| 03/09/2018 11:54 <DIR> examples | +| 03/09/2018 11:55 <DIR> install_hierarchy | +| 03/09/2018 11:54 <DIR> maven-archiver | +| 8 File(s) 292,652,686 bytes | +| 9 Dir(s) 14,138,720,256 bytes free | ++-----------------------------------------------------------------------------------------------------------------------------+ + +.. container:: paragraph + + Now, take the ``.deb`` or the ``.tar.gz`` file and install APEX. + Alternatively, copy the content of the folder ``install_hierarchy`` + to your APEX directory. + +Installation Layout +------------------- + + .. container:: paragraph + + A full installation of APEX comes with the following layout. + + .. container:: listingblock + + .. container:: content + + :: + + $APEX_HOME + ├───bin (1) + ├───etc (2) + │ ├───editor + │ ├───hazelcast + │ ├───infinispan + │ └───META-INF + ├───examples (3) + │ ├───config (4) + │ ├───docker (5) + │ ├───events (6) + │ ├───html (7) + │ ├───models (8) + │ └───scripts (9) + ├───lib (10) + │ └───applications (11) + └───war (12) + + .. container:: colist arabic + + +-----------------------------------+-----------------------------------+ + | **1** | binaries, mainly scripts (bash | + | | and bat) to start the APEX engine | + | | and applications | + +-----------------------------------+-----------------------------------+ + | **2** | configuration files, such as | + | | logback (logging) and third party | + | | library configurations | + +-----------------------------------+-----------------------------------+ + | **3** | example policy models to get | + | | started | + +-----------------------------------+-----------------------------------+ + | **4** | configurations for the examples | + | | (with sub directories for | + | | individual examples) | + +-----------------------------------+-----------------------------------+ + | **5** | Docker files and additional | + | | Docker instructions for the | + | | exampples | + +-----------------------------------+-----------------------------------+ + | **6** | example events for the examples | + | | (with sub directories for | + | | individual examples) | + +-----------------------------------+-----------------------------------+ + | **7** | HTML files for some examples, | + | | e.g. the Decisionmaker example | + +-----------------------------------+-----------------------------------+ + | **8** | the policy models, generated for | + | | each example (with sub | + | | directories for individual | + | | examples) | + +-----------------------------------+-----------------------------------+ + | **9** | additional scripts for the | + | | examples (with sub directories | + | | for individual examples) | + +-----------------------------------+-----------------------------------+ + | **10** | the library folder with all Java | + | | JAR files | + +-----------------------------------+-----------------------------------+ + | **11** | applications, also known as jar | + | | with dependencies (or fat jars), | + | | individually deployable | + +-----------------------------------+-----------------------------------+ + | **12** | WAR files for web applications | + +-----------------------------------+-----------------------------------+ + +System Configuration +-------------------- + + .. container:: paragraph + + Once APEX is installed, a few configurations need to be done: + + .. container:: ulist + + - Create an APEX user and an APEX group (optional, if not + installed using RPM and DPKG) + + - Create environment settings for ``APEX_HOME`` and + ``APEX_USER``, required by the start scripts + + - Change settings of the logging framework (optional) + + - Create directories for logging, required (execution might fail + if directories do not exist or cannot be created) + +APEX User and Group +################### + + .. container:: paragraph + + On smaller installations and test systems, APEX can run as any + user or group. + + .. container:: paragraph + + However, if APEX is installed in production, we strongly + recommend you set up a dedicated user for running APEX. This + will isolate the execution of APEX to that user. We recommend + you use the userid ``apexuser`` but you may use any user you + choose. + + .. container:: paragraph + + The following example, for UNIX, creates a group called + ``apexuser``, an APEX user called ``apexuser``, adds the group + to the user, and changes ownership of the APEX installation to + the user. Substitute ``<apex-dir>`` with the directory where + APEX is installed. + + .. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + # sudo groupadd apexuser + # sudo useradd -g apexuser apexuser + # sudo chown -R apexuser:apexuser <apex-dir> + +.. container:: paragraph + + For other operating systems please consult your manual or system + administrator. + +Environment Settings: APEX_HOME and APEX_USER +############################################# + + .. container:: paragraph + + The provided start scripts for APEX require two environment + variables being set: + + .. container:: ulist + + - ``APEX_USER`` with the user under whos name and permission APEX + should be started (Unix only) + + - ``APEX_HOME`` with the directory where APEX is installed (Unix, + Windows, Cygwin) + + .. container:: paragraph + + The first row in the following table shows how to set these + environment variables temporary (assuming the user is + ``apexuser``). The second row shows how to verify the settings. + The last row explains how to set those variables permanently. + + +------------------------------------------------+---------------------------------------------------------+ + | Unix, Cygwin (bash/tcsh) | Windows | + +================================================+=========================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: | .. code:: | + | :number-lines: | :number-lines: | + | | | + | # export APEX_USER=apexuser | >set APEX_HOME=C:\apex\apex-full-2.0.0-SNAPSHOT | + | # cd /opt/app/policy/apex-pdp | | + | # export APEX_HOME=`pwd` | | + | | | + +------------------------------------------------+ | + | .. container:: | | + | | | + | .. container:: content | | + | | | + | .. code:: tcsh | | + | :number-lines: | | + | | | + | # setenv APEX_USER apexuser | | + | # cd /opt/app/policy/apex-pdp | | + | # setenv APEX_HOME `pwd` | | + | | | + +------------------------------------------------+---------------------------------------------------------+ + | .. container:: | .. container:: | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: | .. code:: | + | :number-lines: | :number-lines: | + | | | + | # env | grep APEX | >set APEX_HOME | + | # APEX_USER=apexuser | APEX_HOME=\apex\apex-full-2.0.0-SNAPSHOT | + | # APEX_HOME=/opt/app/policy/apex-pdp | | + | | | + +------------------------------------------------+---------------------------------------------------------+ + +Making Environment Settings Permanent (Unix, Cygwin) +==================================================== + + .. container:: paragraph + + For a per-user setting, edit the a user’s ``bash`` or ``tcsh`` + settings in ``~/.bashrc`` or ``~/.tcshrc``. For system-wide + settings, edit ``/etc/profiles`` (requires permissions). + +Making Environment Settings Permanent (Windows) +=============================================== + + .. container:: paragraph + + On Windows 7 do + + .. container:: ulist + + - Click on the **Start** Menu + + - Right click on **Computer** + + - Select **Properties** + + .. container:: paragraph + + On Windows 8/10 do + + .. container:: ulist + + - Click on the **Start** Menu + + - Select **System** + + .. container:: paragraph + + Then do the following + + .. container:: ulist + + - Select **Advanced System Settings** + + - On the **Advanced** tab, click the **Environment Variables** + button + + - Edit an existing variable, or create a new System variable: + 'Variable name'="APEX_HOME", 'Variable + value'="C:\apex\apex-full-2.0.0-SNAPSHOT" + + .. container:: paragraph + + For the settings to take effect, an application needs to be + restarted (e.g. any open ``cmd`` window). + +Edit the APEX Logging Settings +############################## + + .. container:: paragraph + + Configure the APEX logging settings to your requirements, for + instance: + + .. container:: ulist + + - change the directory where logs are written to, or + + - change the log levels + + .. container:: paragraph + + Edit the file ``$APEX_HOME/etc/logback.xml`` for any required + changes. To change the log directory change the line + + .. container:: paragraph + + ``<property name="VAR_LOG" value="/var/log/onap/policy/apex-pdp/" />`` + + .. container:: paragraph + + to + + .. container:: paragraph + + ``<property name="VAR_LOG" value="/PATH/TO/LOG/DIRECTORY/" />`` + + .. container:: paragraph + + On Windows, it is recommended to change the log directory to: + + .. container:: paragraph + + ``<property name="VAR_LOG" value="C:/apex/apex-full-2.0.0-SNAPSHOT/logs" />`` + + .. container:: paragraph + + Note: Be careful about when to use ``\`` vs. ``/`` as the path + separator! + +Create Directories for Logging +############################## + + .. container:: paragraph + + Make sure that the log directory exists. This is important when + APEX was installed manually or when the log directory was changed + in the settings (see above). + + +------------------------------------------------------------------+-------------------------------------------------------+ + | Unix, Cygwin | Windows | + +==================================================================+=======================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: | .. code:: | + | :number-lines: | :number-lines: | + | | | + | mkdir -p /var/log/onap/policy/apex-pdp | >mkdir C:\apex\apex-full-2.0.0-SNAPSHOT\logs | + | chown -R apexuser:apexuser /var/log/onap/policy/apex-pdp | | + +------------------------------------------------------------------+-------------------------------------------------------+ + +Verify the APEX Installation +---------------------------- + + .. container:: paragraph + + When APEX is installed and all settings are realized, the + installation can be verified. + +Verify Installation - run Engine +################################ + + .. container:: paragraph + + A simple verification of an APEX installation can be done by + simply starting the APEX engine without any configuration. On + Unix (or Cygwin) start the engine using + ``$APEX_HOME/bin/apexEngine.sh``. On Windows start the engine + using ``%APEX_HOME%\bin\apexEngine.bat``. The engine will fail + to fully start. However, if the output looks similar to the + following line, the APEX installation is realized. + + .. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + Starting Apex service with parameters [] . . . + start of Apex service failed: Apex configuration file was not specified as an argument + 2018-09-03 13:11:33,914 Apex [main] ERROR o.o.p.a.service.engine.main.ApexMain - start of Apex service failed + org.onap.policy.apex.model.basicmodel.concepts.ApexException: Apex configuration file was not specified as an argument + at org.onap.policy.apex.service.engine.main.ApexCommandLineArguments.validateReadableFile(ApexCommandLineArguments.java:267) + at org.onap.policy.apex.service.engine.main.ApexCommandLineArguments.validate(ApexCommandLineArguments.java:161) + at org.onap.policy.apex.service.engine.main.ApexMain.<init>(ApexMain.java:68) + at org.onap.policy.apex.service.engine.main.ApexMain.main(ApexMain.java:165) + usage: org.onap.policy.apex.service.engine.main.ApexMain [options...] + options + -c,--config-file <CONFIG_FILE>the full path to the configuration file to use, the configuration file must be a Json file + containing the Apex configuration parameters + -h,--help outputs the usage of this command + -m,--model-file <MODEL_FILE> the full path to the model file to use, if set it overrides the model file set in the + configuration file + -v,--version outputs the version of Apex + +Verify Installation - run an Example +#################################### + + .. container:: paragraph + + A full APEX installation comes with several examples. Here, we can + fully verify the installation by running one of the examples. + + .. container:: paragraph + + We use the example called *SampleDomain* and configure the engine + to use standard in and standard out for events. Run the engine + with the provided configuration. Note: Cygwin executes scripts as + Unix scripts but runs Java as a Windows application, thus the + configuration file must be given as a Windows path. + + .. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + # $APEX_HOME/bin/apexEngine.sh -c $APEX_HOME/examples/config/SampleDomain/Stdin2StdoutJsonEventJava.json (1) + # $APEX_HOME/bin/apexEngine.sh -c C:/apex/apex-full-2.0.0-SNAPSHOT/examples/config/SampleDomain/Stdin2StdoutJsonEventJava.json (2) + >%APEX_HOME%\bin\apexEngine.bat -c %APEX_HOME%\examples\config\SampleDomain\Stdin2StdoutJsonEventJava.json :: (3) + +.. container:: colist arabic + + +-------+---------+ + | **1** | UNIX | + +-------+---------+ + | **2** | Cygwin | + +-------+---------+ + | **3** | Windows | + +-------+---------+ + +.. container:: paragraph + + The engine should start successfully. Assuming the logging levels are + not change (default level is ``info``), the output should look + similar to this (last few lines) + +.. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + Starting Apex service with parameters [-c, v:/dev/ericsson/apex/onap/apex-pdp/packages/apex-pdp-package-full/target/install_hierarchy/examples/config/SampleDomain/Stdin2StdoutJsonEventJava.json] . . . + 2018-09-05 15:16:42,800 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Created apex engine MyApexEngine-0:0.0.1 . + 2018-09-05 15:16:42,804 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Created apex engine MyApexEngine-1:0.0.1 . + 2018-09-05 15:16:42,804 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Created apex engine MyApexEngine-2:0.0.1 . + 2018-09-05 15:16:42,805 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Created apex engine MyApexEngine-3:0.0.1 . + 2018-09-05 15:16:42,805 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - APEX service created. + 2018-09-05 15:16:43,962 Apex [main] INFO o.o.p.a.s.e.e.EngDepMessagingService - engine<-->deployment messaging starting . . . + 2018-09-05 15:16:43,963 Apex [main] INFO o.o.p.a.s.e.e.EngDepMessagingService - engine<-->deployment messaging started + 2018-09-05 15:16:44,987 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Registering apex model on engine MyApexEngine-0:0.0.1 + 2018-09-05 15:16:45,112 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Registering apex model on engine MyApexEngine-1:0.0.1 + 2018-09-05 15:16:45,113 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Registering apex model on engine MyApexEngine-2:0.0.1 + 2018-09-05 15:16:45,113 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Registering apex model on engine MyApexEngine-3:0.0.1 + 2018-09-05 15:16:45,120 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Added the action listener to the engine + Started Apex service + +.. container:: paragraph + + Important are the last two line, stating that APEX has added the + final action listener to the engine and that the engine is started. + +.. container:: paragraph + + The engine is configured to read events from standard input and write + produced events to standard output. The policy model is a very simple + policy. + +.. container:: paragraph + + The following table shows an input event in the left column and an + output event in the right column. Past the input event into the + console where APEX is running, and the output event should appear in + the console. Pasting the input event multiple times will produce + output events with different values. + ++-------------------------------------------------------------+-------------------------------------------------------------+ +| Input Event | Example Output Event | ++=============================================================+=============================================================+ +| .. container:: | .. container:: | +| | | +| .. container:: content | .. container:: content | +| | | +| .. code:: | .. code:: | +| :number-lines: | :number-lines: | +| | | +| { | { | +| "nameSpace": "org.onap.policy.apex.sample.events", | "name": "Event0004", | +| "name": "Event0000", | "version": "0.0.1", | +| "version": "0.0.1", | "nameSpace": "org.onap.policy.apex.sample.events", | +| "source": "test", | "source": "Act", | +| "target": "apex", | "target": "Outside", | +| "TestSlogan": "Test slogan for External Event0", | "TestActCaseSelected": 2, | +| "TestMatchCase": 0, | "TestActStateTime": 1536157104627, | +| "TestTimestamp": 1469781869269, | "TestDecideCaseSelected": 0, | +| "TestTemperature": 9080.866 | "TestDecideStateTime": 1536157104625, | +| } | "TestEstablishCaseSelected": 0, | +| | "TestEstablishStateTime": 1536157104623, | +| | "TestMatchCase": 0, | +| | "TestMatchCaseSelected": 1, | +| | "TestMatchStateTime": 1536157104620, | +| | "TestSlogan": "Test slogan for External Event0", | +| | "TestTemperature": 9080.866, | +| | "TestTimestamp": 1469781869269 | +| | } | ++-------------------------------------------------------------+-------------------------------------------------------------+ + +.. container:: paragraph + + Terminate APEX by simply using ``CTRL+C`` in the console. + +Verify a Full Installation - REST Editor +######################################## + + .. container:: paragraph + + APEX has a REST application for viewing policy models. The + application can also be used to create new policy models close to + the engine native policy language. Start the REST editor as + follows. + + .. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + # $APEX_HOME/bin/apexApps.sh rest-editor + +.. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + >%APEX_HOME%\bin\apexApps.bat rest-editor + +.. container:: paragraph + + The script will start a simple web server + (`Grizzly <https://javaee.github.io/grizzly/>`__) and deploy a + ``war`` web archive in it. Once the editor is started, it will be + available on ``localhost:18989``. The last few line of the messages + should be: + +.. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + Apex Editor REST endpoint (ApexEditorMain: Config=[ApexEditorParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=READY) starting at http://localhost:18989/apexservices/ . . . + Sep 05, 2018 10:35:57 PM org.glassfish.grizzly.http.server.NetworkListener start + INFO: Started listener bound to [localhost:18989] + Sep 05, 2018 10:35:57 PM org.glassfish.grizzly.http.server.HttpServer start + INFO: [HttpServer] Started. + Apex Editor REST endpoint (ApexEditorMain: Config=[ApexEditorParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=RUNNING) started at http://localhost:18989/apexservices/ + +.. container:: paragraph + + Now open a browser (Firefox, Chrome, Opera, Internet Explorer) and + use the URL ``http://localhost:18989/``. This will connect the + browser to the started REST editor. The start screen should be as + follows. + +.. container:: imageblock + + .. container:: content + + |REST Editor Start Screen| + + .. container:: title + + Figure 1. REST Editor Start Screen + +.. container:: paragraph + + Now load a policy model by clicking the menu ``File`` and then + ``Open``. In the opened dialog, go to the directory where APEX is + installed, then ``examples``, ``models``, ``SampleDomain``, and there + select the file ``SamplePolicyModelJAVA.json``. This will load the + policy model used to verify the policy engine (see above). Once + loaded, the screen should look as follows. + +.. container:: imageblock + + .. container:: content + + |REST Editor with loaded SampleDomain Policy Model| + + .. container:: title + + Figure 2. REST Editor with loaded SampleDomain Policy Model + +.. container:: paragraph + + Now you can use the REST editor. To finish this verification, simply + terminate your browser (or the tab), and then use ``CTRL+C`` in the + console where you started the REST editor. + +Installing WAR Applications +--------------------------- + + .. container:: paragraph + + APEX comes with a set of WAR files. These are complete + applications that can be installed and run in an application + server. All of these applications are realized as servlets. You + can find the WAR applications in ``$APEX_HOME/war`` (UNIX, Cygwin) + or ``%APEX_HOME%\war`` (Windows). + + .. container:: paragraph + + Installing and using the WAR applications requires a web server + that can execute ``war`` web archives. We recommend to use `Apache + Tomcat <https://tomcat.apache.org/>`__, however other web servers + can be used as well. + + .. container:: paragraph + + Install Apache Tomcat including the ``Manager App``, see `V9.0 + Docs <https://tomcat.apache.org/tomcat-9.0-doc/manager-howto.html#Configuring_Manager_Application_Access>`__ + for details. Start the Tomcat service, or make sure that Tomcat is + running. + + .. container:: paragraph + + There are multiple ways to install the APEX WAR applications: + + .. container:: ulist + + - copy the ``.war`` file into the Tomcat ``webapps`` folder + + - use the Tomcat ``Manager App`` to deploy via the web interface + + - deploy using a REST call to Tomcat + + .. container:: paragraph + + For details on how to install ``war`` files please consult the + `Tomcat + Documentation <https://tomcat.apache.org/tomcat-9.0-doc/index.html>`__ + or the `Manager App + HOW-TO <https://tomcat.apache.org/tomcat-9.0-doc/manager-howto.html>`__. + Once you installed an APEX WAR application (and wait for + sufficient time for Tomcat to finalize the installation), open the + ``Manager App`` in Tomcat. You should see the APEX WAR application + being installed and running. + + .. container:: paragraph + + In case of errors, examine the log files in the Tomcat log + directory. In a conventional install, those log files are in the + logs directory where Tomcat is installed. + + .. container:: paragraph + + The current APEX version provides the following WAR applications: + + .. container:: ulist + + - client-deployment-2.0.0-SNAPSHOT.war - a client to deploy new + policy models to a running engine + + - client-editor-2.0.0-SNAPSHOT.war - the standard policy REST + editor GUI + + - client-monitoring-2.0.0-SNAPSHOT.war - a client for monitoring + a running APEX engine + + - client-full-2.0.0-SNAPSHOT.war - a full client with a + one-stop-access to deployment, monitoring, and REST editor + + - examples-servlet-2.0.0-SNAPSHOT.war - an example APEX servlet + +Running APEX in Docker +---------------------- + + .. container:: paragraph + + Since APEX is in ONAP, we provide a full virtualization + environment for the engine. + +Run in ONAP +########### + + .. container:: paragraph + + Running APEX from the ONAP docker repository only requires 2 + commands: + + .. container:: olist arabic + + #. Log into the ONAP docker repo + + .. container:: listingblock + + .. container:: content + + :: + + docker login -u docker -p docker nexus3.onap.org:10003 + + .. container:: olist arabic + + #. Run the APEX docker image + + .. container:: listingblock + + .. container:: content + + :: + + docker run -it --rm nexus3.onap.org:10003/onap/policy-apex-pdp:latest + +Build a Docker Image +#################### + + .. container:: paragraph + + Alternatively, one can use the Dockerfile defined in the Docker + package to build an image. + + .. container:: listingblock + + .. container:: title + + APEX Dockerfile + + .. container:: content + + .. code:: + :number-lines: + + # + # Docker file to build an image that runs APEX on Java 8 in Ubuntu + # + FROM ubuntu:16.04 + + RUN apt-get update && \ + apt-get upgrade -y && \ + apt-get install -y software-properties-common && \ + add-apt-repository ppa:openjdk-r/ppa -y && \ + apt-get update && \ + apt-get install -y openjdk-8-jdk + + # Create apex user and group + RUN groupadd apexuser + RUN useradd --create-home -g apexuser apexuser + + # Add Apex-specific directories and set ownership as the Apex admin user + RUN mkdir -p /opt/app/policy/apex-pdp + RUN mkdir -p /var/log/onap/policy/apex-pdp + RUN chown -R apexuser:apexuser /var/log/onap/policy/apex-pdp + + # Unpack the tarball + RUN mkdir /packages + COPY apex-pdp-package-full.tar.gz /packages + RUN tar xvfz /packages/apex-pdp-package-full.tar.gz --directory /opt/app/policy/apex-pdp + RUN rm /packages/apex-pdp-package-full.tar.gz + + # Ensure everything has the correct permissions + RUN find /opt/app -type d -perm 755 + RUN find /opt/app -type f -perm 644 + RUN chmod a+x /opt/app/policy/apex-pdp/bin/* + + # Copy examples to Apex user area + RUN cp -pr /opt/app/policy/apex-pdp/examples /home/apexuser + + RUN apt-get clean + + RUN chown -R apexuser:apexuser /home/apexuser/* + + USER apexuser + ENV PATH /opt/app/policy/apex-pdp/bin:$PATH + WORKDIR /home/apexuser + +APEX Configurations Explained +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Introduction to APEX Configuration +---------------------------------- + + .. container:: paragraph + + An APEX engine can be configured to use various combinations + of event input handlers, event output handlers, event + protocols, context handlers, and logic executors. The system + is build using a plugin architecture. Each configuration + option is realized by a plugin, which can be loaded and + configured when the engine is started. New plugins can be + added to the system at any time, though to benefit from a + new plugin an engine will need to be restarted. + + .. container:: imageblock + + .. container:: content + + |APEX Configuration Matrix| + + .. container:: title + + Figure 3. APEX Configuration Matrix + + .. container:: paragraph + + The APEX distribution already comes with a number of + plugins. The figure above shows the provided plugins. Any + combination of input, output, event protocol, context + handlers, and executors is possible. + +General Configuration Format +---------------------------- + + .. container:: paragraph + + The APEX configuration file is a JSON file containing a few + main blocks for different parts of the configuration. Each + block then holds the configuration details. The following + code shows the main blocks: + + .. container:: listingblock + + .. container:: content + + .. code:: + + { + "engineServiceParameters":{ + ... (1) + "engineParameters":{ (2) + "engineParameters":{...}, (3) + "contextParameters":{...} (4) + } + }, + "eventInputParameters":{ (5) + "input1":{ (6) + "carrierTechnologyParameters":{...}, + "eventProtocolParameters":{...} + }, + "input2":{...}, (7) + "carrierTechnologyParameters":{...}, + "eventProtocolParameters":{...} + }, + ... (8) + }, + "eventOutputParameters":{ (9) + "output1":{ (10) + "carrierTechnologyParameters":{...}, + "eventProtocolParameters":{...} + }, + "output2":{ (11) + "carrierTechnologyParameters":{...}, + "eventProtocolParameters":{...} + }, + ... (12) + } + } + + .. container:: colist arabic + + +-----------------------------------+-----------------------------------+ + | **1** | main engine configuration | + +-----------------------------------+-----------------------------------+ + | **2** | engine parameters for plugin | + | | configurations (execution | + | | environments and context | + | | handling) | + +-----------------------------------+-----------------------------------+ + | **3** | engine specific parameters, | + | | mainly for executor plugins | + +-----------------------------------+-----------------------------------+ + | **4** | context specific parameters, e.g. | + | | for context schemas, persistence, | + | | etc. | + +-----------------------------------+-----------------------------------+ + | **5** | configuration of the input | + | | interface | + +-----------------------------------+-----------------------------------+ + | **6** | an example input called | + | | ``input1`` with carrier | + | | technology and event protocol | + +-----------------------------------+-----------------------------------+ + | **7** | an example input called | + | | ``input2`` with carrier | + | | technology and event protocol | + +-----------------------------------+-----------------------------------+ + | **8** | any further input configuration | + +-----------------------------------+-----------------------------------+ + | **9** | configuration of the output | + | | interface | + +-----------------------------------+-----------------------------------+ + | **10** | an example output called | + | | ``output1`` with carrier | + | | technology and event protocol | + +-----------------------------------+-----------------------------------+ + | **11** | an example output called | + | | ``output2`` with carrier | + | | technology and event protocol | + +-----------------------------------+-----------------------------------+ + | **12** | any further output configuration | + +-----------------------------------+-----------------------------------+ + +Engine Service Parameters +------------------------- + + .. container:: paragraph + + The configuration provides a number of parameters to + configure the engine. An example configuration with + explanations of all options is shown below. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "engineServiceParameters" : { + "name" : "AADMApexEngine", (1) + "version" : "0.0.1", (2) + "id" : 45, (3) + "instanceCount" : 4, (4) + "deploymentPort" : 12345, (5) + "policyModelFileName" : "examples/models/VPN/VPNPolicyModelJava.json", (6) + "periodicEventPeriod": 1000, (7) + "engineParameters":{ (8) + "engineParameters":{...}, (9) + "contextParameters":{...} (10) + } + } + + .. container:: colist arabic + + +-----------------------------------+-----------------------------------+ + | **1** | a name for the engine. The engine | + | | name is used to create a key in a | + | | runtime engine. An name matching | + | | the following regular expression | + | | can be used here: | + | | ``[A-Za-z0-9\\-_\\.]+`` | + +-----------------------------------+-----------------------------------+ + | **2** | a version of the engine, use | + | | semantic versioning as explained | + | | here: `Semantic | + | | Versioning <http://semver.org/>`_ | + | | _. | + | | This version is used in a runtime | + | | engine to create a version of the | + | | engine. For that reason, the | + | | version must match the following | + | | regular expression ``[A-Z0-9.]+`` | + +-----------------------------------+-----------------------------------+ + | **3** | a numeric identifier for the | + | | engine | + +-----------------------------------+-----------------------------------+ + | **4** | the number of threads (policy | + | | instances executed in parallel) | + | | the engine should use, use ``1`` | + | | for single threaded engines | + +-----------------------------------+-----------------------------------+ + | **5** | the port for the deployment | + | | Websocket connection to the | + | | engine | + +-----------------------------------+-----------------------------------+ + | **6** | the model file to load into the | + | | engine on startup (optional) | + +-----------------------------------+-----------------------------------+ + | **7** | an optional timer for periodic | + | | policies, in milliseconds (a | + | | defined periodic policy will be | + | | executed every ``X`` | + | | milliseconds), not used of not | + | | set or ``0`` | + +-----------------------------------+-----------------------------------+ + | **8** | engine parameters for plugin | + | | configurations (execution | + | | environments and context | + | | handling) | + +-----------------------------------+-----------------------------------+ + | **9** | engine specific parameters, | + | | mainly for executor plugins | + +-----------------------------------+-----------------------------------+ + | **10** | context specific parameters, e.g. | + | | for context schemas, persistence, | + | | etc. | + +-----------------------------------+-----------------------------------+ + + .. container:: paragraph + + The model file is optional, it can also be specified via + command line. In any case, make sure all execution and other + required plug-ins for the loaded model are loaded as + required. + +Input and Output Interfaces +--------------------------- + + .. container:: paragraph + + An APEX engine has two main interfaces: + + .. container:: ulist + + - An *input* interface to receive events: also known as + ingress interface or consumer, receiving (consuming) + events commonly named triggers, and + + - An *output* interface to publish produced events: also + known as egress interface or producer, sending + (publishing) events commonly named actions or action + events. + + .. container:: paragraph + + The input and output interface is configured in terms of + inputs and outputs, respectively. Each input and output is a + combination of a carrier technology and an event protocol. + Carrier technologies and event protocols are provided by + plugins, each with its own specific configuration. Most + carrier technologies can be configured for input as well as + output. Most event protocols can be used for all carrier + technologies. One exception is the JMS object event + protocol, which can only be used for the JMS carrier + technology. Some further restrictions apply (for instance + for carrier technologies using bi- or uni-directional + modes). + + .. container:: paragraph + + Input and output interface can be configured separately, in + isolation, with any number of carrier technologies. The + resulting general configuration options are: + + .. container:: ulist + + - Input interface with one or more inputs + + .. container:: ulist + + - each input with a carrier technology and an event + protocol + + - some inputs with optional synchronous mode + + - some event protocols with additional parameters + + - Output interface with one or more outputs + + .. container:: ulist + + - each output with a carrier technology and an event + encoding + + - some outputs with optional synchronous mode + + - some event protocols with additional parameters + + .. container:: paragraph + + The configuration for input and output is contained in + ``eventInputParameters`` and ``eventOutputParameters``, + respectively. Inside here, one can configure any number of + inputs and outputs. Each of them needs to have a unique + identifier (name), the content of the name is free form. The + example below shows a configuration for two inputs and two + outputs. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "eventInputParameters": { (1) + "FirstConsumer": { (2) + "carrierTechnologyParameters" : {...}, (3) + "eventProtocolParameters":{...}, (4) + ... (5) + }, + "SecondConsumer": { (6) + "carrierTechnologyParameters" : {...}, (7) + "eventProtocolParameters":{...}, (8) + ... (9) + }, + }, + "eventOutputParameters": { (10) + "FirstProducer": { (11) + "carrierTechnologyParameters":{...}, (12) + "eventProtocolParameters":{...}, (13) + ... (14) + }, + "SecondProducer": { (15) + "carrierTechnologyParameters":{...}, (16) + "eventProtocolParameters":{...}, (17) + ... (18) + } + } + + .. container:: colist arabic + + +--------+--------------------------------------------------------------------+ + | **1** | input interface configuration, APEX input plugins | + +--------+--------------------------------------------------------------------+ + | **2** | first input called ``FirstConsumer`` | + +--------+--------------------------------------------------------------------+ + | **3** | carrier technology for plugin | + +--------+--------------------------------------------------------------------+ + | **4** | event protocol for plugin | + +--------+--------------------------------------------------------------------+ + | **5** | any other input configuration (e.g. event name filter, see below) | + +--------+--------------------------------------------------------------------+ + | **6** | second input called ``SecondConsumer`` | + +--------+--------------------------------------------------------------------+ + | **7** | carrier technology for plugin | + +--------+--------------------------------------------------------------------+ + | **8** | event protocol for plugin | + +--------+--------------------------------------------------------------------+ + | **9** | any other plugin configuration | + +--------+--------------------------------------------------------------------+ + | **10** | output interface configuration, APEX output plugins | + +--------+--------------------------------------------------------------------+ + | **11** | first output called ``FirstProducer`` | + +--------+--------------------------------------------------------------------+ + | **12** | carrier technology for plugin | + +--------+--------------------------------------------------------------------+ + | **13** | event protocol for plugin | + +--------+--------------------------------------------------------------------+ + | **14** | any other plugin configuration | + +--------+--------------------------------------------------------------------+ + | **15** | second output called ``SecondProducer`` | + +--------+--------------------------------------------------------------------+ + | **16** | carrier technology for plugin | + +--------+--------------------------------------------------------------------+ + | **17** | event protocol for plugin | + +--------+--------------------------------------------------------------------+ + | **18** | any other output configuration (e.g. event name filter, see below) | + +--------+--------------------------------------------------------------------+ + +Event Filters +############# + + .. container:: paragraph + + APEX will always send an event after a policy execution + is finished. For a successful execution, the event sent + is the output event created by the policy. In case the + policy does not create an output event, APEX will create + a new event with all input event fields plus an + additional field ``exceptionMessage`` with an exception + message. + + .. container:: paragraph + + There are situations in which this auto-generated error + event might not be required or wanted: + + .. container:: ulist + + - when a policy failing should not result in an event + send out via an output interface + + - when the auto-generated event goes back in an APEX + engine (or the same APEX engine), this can create + endless loops + + - the auto-generated event should go to a special output + interface or channel + + .. container:: paragraph + + All of these situations are supported by a filter option + using a wildecard (regular expression) configuration on + APEX I/O interfaces. The parameter is called + ``eventNameFilter`` and the value are `Java regular + expressions <https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html>`__ + (a + `tutorial <http://www.vogella.com/tutorials/JavaRegularExpressions/article.html>`__). + The following code shows some examples: + + .. container:: listingblock + + .. container:: content + + .. code:: + + "eventInputParameters": { + "Input1": { + "carrierTechnologyParameters" : {...}, + "eventProtocolParameters":{...}, + "eventNameFilter" : "^E[Vv][Ee][Nn][Tt][0-9]004$" (1) + } + }, + "eventOutputParameters": { + "Output1": { + "carrierTechnologyParameters":{...}, + "eventProtocolParameters":{...}, + "eventNameFilter" : "^E[Vv][Ee][Nn][Tt][0-9]104$" (2) + } + } + +Executors +--------- + + .. container:: paragraph + + Executors are plugins that realize the execution of logic + contained in a policy model. Logic can be in a task + selector, a task, and a state finalizer. Using plugins for + execution environments makes APEX very flexible to support + virtually any executable logic expressions. + + .. container:: paragraph + + APEX 2.0.0-SNAPSHOT supports the following executors: + + .. container:: ulist + + - Java, for Java implemented logic + + .. container:: ulist + + - This executor requires logic implemented using the + APEX Java interfaces. + + - Generated JAR files must be in the classpath of the + APEX engine at start time. + + - Javascript + + - JRuby, + + - Jython, + + - MVEL + + .. container:: ulist + + - This executor uses the latest version of the MVEL + engine, which can be very hard to debug and can + produce unwanted side effects during execution + +Configure the Javascript Executor +################################# + + .. container:: paragraph + + The Javascript executor is added to the configuration as + follows: + + .. container:: listingblock + + .. container:: content + + .. code:: + + "engineServiceParameters":{ + "engineParameters":{ + "executorParameters":{ + "JAVASCRIPT":{ + "parameterClassName" : + "org.onap.policy.apex.plugins.executor.javascript.JavascriptExecutorParameters" + } + } + } + } + +Configure the Jython Executor +############################# + + .. container:: paragraph + + The Jython executor is added to the configuration as + follows: + + .. container:: listingblock + + .. container:: content + + .. code:: + + "engineServiceParameters":{ + "engineParameters":{ + "executorParameters":{ + "JYTHON":{ + "parameterClassName" : + "org.onap.policy.apex.plugins.executor.jython.JythonExecutorParameters" + } + } + } + } + +Configure the JRuby Executor +############################ + + .. container:: paragraph + + The JRuby executor is added to the configuration as + follows: + + .. container:: listingblock + + .. container:: content + + .. code:: + + "engineServiceParameters":{ + "engineParameters":{ + "executorParameters":{ + "JRUBY":{ + "parameterClassName" : + "org.onap.policy.apex.plugins.executor.jruby.JrubyExecutorParameters" + } + } + } + } + +Configure the Java Executor +########################### + + .. container:: paragraph + + The Java executor is added to the configuration as + follows: + + .. container:: listingblock + + .. container:: content + + .. code:: + + "engineServiceParameters":{ + "engineParameters":{ + "executorParameters":{ + "JAVA":{ + "parameterClassName" : + "org.onap.policy.apex.plugins.executor.java.JavaExecutorParameters" + } + } + } + } + +Configure the MVEL Executor +########################### + + .. container:: paragraph + + The MVEL executor is added to the configuration as + follows: + + .. container:: listingblock + + .. container:: content + + .. code:: + + "engineServiceParameters":{ + "engineParameters":{ + "executorParameters":{ + "MVEL":{ + "parameterClassName" : + "org.onap.policy.apex.plugins.executor.mvel.MVELExecutorParameters" + } + } + } + } + +Context Handlers +---------------- + + .. container:: paragraph + + Context handlers are responsible for all context processing. + There are the following main areas: + + .. container:: ulist + + - Context schema: use schema handlers other than Java class + (supported by default without configuration) + + - Context distribution: distribute context across multiple + APEX engines + + - Context locking: mechanisms to lock context elements for + read/write + + - Context persistence: mechanisms to persist context + + .. container:: paragraph + + APEX provides plugins for each of the main areas. + +Configure AVRO Schema Handler +############################# + + .. container:: paragraph + + The AVRO schema handler is added to the configuration as + follows: + + .. container:: listingblock + + .. container:: content + + .. code:: + + "engineServiceParameters":{ + "engineParameters":{ + "contextParameters":{ + "parameterClassName" : "org.onap.policy.apex.context.parameters.ContextParameters", + "schemaParameters":{ + "Avro":{ + "parameterClassName" : + "org.onap.policy.apex.plugins.context.schema.avro.AvroSchemaHelperParameters" + } + } + } + } + } + + .. container:: paragraph + + Using the AVRO schema handler has one limitation: AVRO + only supports field names that represent valid Java class + names. This means only letters and the character ``_`` + are supported. Characters commonly used in field names, + such as ``.`` and ``-``, are not supported by AVRO. for + more information see `Avro Spec: + Names <https://avro.apache.org/docs/1.8.1/spec.html#names>`__. + + .. container:: paragraph + + To work with this limitation, the APEX Avro plugin will + parse a given AVRO definition and replace *all* + occurrences of ``.`` and ``-`` with a ``_``. This means + that + + .. container:: ulist + + - In a policy model, if the AVRO schema defined a field + as ``my-name`` the policy logic should access it as + ``my_name`` + + - In a policy model, if the AVRO schema defined a field + as ``my.name`` the policy logic should access it as + ``my_name`` + + - There should be no field names that convert to the + same internal name + + .. container:: ulist + + - For instance the simultaneous use of + ``my_name``, ``my.name``, and ``my-name`` should + be avoided + + - If not avoided, the event processing might + create unwanted side effects + + - If field names use any other not-supported character, + the AVRO plugin will reject it + + .. container:: ulist + + - Since AVRO uses lazy initialization, this + rejection might only become visible at runtime + +Carrier Technologies +-------------------- + + .. container:: paragraph + + Carrier technologies define how APEX receives (input) and + sends (output) events. They can be used in any combination, + using asynchronous or synchronous mode. There can also be + any number of carrier technologies for the input (consume) + and the output (produce) interface. + + .. container:: paragraph + + Supported *input* technologies are: + + .. container:: ulist + + - Standard input, read events from the standard input + (console), not suitable for APEX background servers + + - File input, read events from a file + + - Kafka, read events from a Kafka system + + - Websockets, read events from a Websocket + + - JMS, + + - REST (synchronous and asynchronous), additionally as + client or server + + - Event Requestor, allows reading of events that have been + looped back into APEX + + .. container:: paragraph + + Supported *output* technologies are: + + .. container:: ulist + + - Standard output, write events to the standard output + (console), not suitable for APEX background servers + + - File output, write events to a file + + - Kafka, write events to a Kafka system + + - Websockets, write events to a Websocket + + - JMS + + - REST (synchronous and asynchronous), additionally as + client or server + + - Event Requestor, allows events to be looped back into + APEX + + .. container:: paragraph + + New carrier technologies can be added as plugins to APEX or + developed outside APEX and added to an APEX deployment. + +Standard IO +########### + + .. container:: paragraph + + Standard IO does not require a specific plugin, it is + supported be default. + +Standard Input +============== + .. container:: paragraph + + APEX will take events from its standard input. This + carrier is good for testing, but certainly not for a + use case where APEX runs as a server. The + configuration is as follows: + + .. container:: listingblock + + .. container:: content + + :: + + "carrierTechnologyParameters" : { + "carrierTechnology" : "FILE", (1) + "parameters" : { + "standardIO" : true (2) + } + } + + .. container:: colist arabic + + +-------+---------------------------------------+ + | **1** | standard input is considered a file | + +-------+---------------------------------------+ + | **2** | file descriptor set to standard input | + +-------+---------------------------------------+ + +Standard Output +=============== + + .. container:: paragraph + + APEX will send events to its standard output. This + carrier is good for testing, but certainly not for a + use case where APEX runs as a server. The + configuration is as follows: + + .. container:: listingblock + + .. container:: content + + .. code:: + + "carrierTechnologyParameters" : { + "carrierTechnology" : "FILE", (1) + "parameters" : { + "standardIO" : true (2) + } + } + + .. container:: colist arabic + + +-------+----------------------------------------+ + | **1** | standard output is considered a file | + +-------+----------------------------------------+ + | **2** | file descriptor set to standard output | + +-------+----------------------------------------+ + +2.7.2. File IO +############## + + .. container:: paragraph + + File IO does not require a specific plugin, it is + supported be default. + +File Input +========== + + .. container:: paragraph + + APEX will take events from a file. The same file + should not be used as an output. The configuration is + as follows: + + .. container:: listingblock + + .. container:: content + + .. code:: + + "carrierTechnologyParameters" : { + "carrierTechnology" : "FILE", (1) + "parameters" : { + "fileName" : "examples/events/SampleDomain/EventsIn.xmlfile" (2) + } + } + + .. container:: colist arabic + + +-------+------------------------------------------+ + | **1** | set file input | + +-------+------------------------------------------+ + | **2** | the name of the file to read events from | + +-------+------------------------------------------+ + +File Output +=========== + .. container:: paragraph + + APEX will write events to a file. The same file should + not be used as an input. The configuration is as + follows: + + .. container:: listingblock + + .. container:: content + + .. code:: + + "carrierTechnologyParameters" : { + "carrierTechnology" : "FILE", (1) + "parameters" : { + "fileName" : "examples/events/SampleDomain/EventsOut.xmlfile" (2) + } + } + + .. container:: colist arabic + + +-------+-----------------------------------------+ + | **1** | set file output | + +-------+-----------------------------------------+ + | **2** | the name of the file to write events to | + +-------+-----------------------------------------+ + +Event Requestor IO +################## + + .. container:: paragraph + + Event Requestor IO does not require a specific plugin, it + is supported be default. It should only be used with the + APEX event protocol. + +Event Requestor Input +===================== + + .. container:: paragraph + + APEX will take events from APEX. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "carrierTechnologyParameters" : { + "carrierTechnology": "EVENT_REQUESTOR" (1) + } + + .. container:: colist arabic + + +-------+---------------------------+ + | **1** | set event requestor input | + +-------+---------------------------+ + +Event Requestor Output +====================== + + .. container:: paragraph + + APEX will write events to APEX. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "carrierTechnologyParameters" : { + "carrierTechnology": "EVENT_REQUESTOR" (1) + } + +Peering Event Requestors +======================== + + .. container:: paragraph + + When using event requestors, they need to be peered. + This means an event requestor output needs to be + peered (associated) with an event requestor input. The + following example shows the use of an event requestor + with the APEX event protocol and the peering of output + and input. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "eventInputParameters": { + "EventRequestorConsumer": { + "carrierTechnologyParameters": { + "carrierTechnology": "EVENT_REQUESTOR" (1) + }, + "eventProtocolParameters": { + "eventProtocol": "APEX" (2) + }, + "eventNameFilter": "InputEvent", (3) + "requestorMode": true, (4) + "requestorPeer": "EventRequestorProducer", (5) + "requestorTimeout": 500 (6) + } + }, + "eventOutputParameters": { + "EventRequestorProducer": { + "carrierTechnologyParameters": { + "carrierTechnology": "EVENT_REQUESTOR" (7) + }, + "eventProtocolParameters": { + "eventProtocol": "APEX" (8) + }, + "eventNameFilter": "EventListEvent", (9) + "requestorMode": true, (10) + "requestorPeer": "EventRequestorConsumer", (11) + "requestorTimeout": 500 (12) + } + } + + .. container:: colist arabic + + +-----------------------------------+-----------------------------------+ + | **1** | event requestor on a consumer | + +-----------------------------------+-----------------------------------+ + | **2** | with APEX event protocol | + +-----------------------------------+-----------------------------------+ + | **3** | optional filter (best to use a | + | | filter to prevent unwanted events | + | | on the consumer side) | + +-----------------------------------+-----------------------------------+ + | **4** | activate requestor mode | + +-----------------------------------+-----------------------------------+ + | **5** | the peer to the output (must | + | | match the output carrier) | + +-----------------------------------+-----------------------------------+ + | **6** | an optional timeout in | + | | milliseconds | + +-----------------------------------+-----------------------------------+ + | **7** | event requestor on a producer | + +-----------------------------------+-----------------------------------+ + | **8** | with APEX event protocol | + +-----------------------------------+-----------------------------------+ + | **9** | optional filter (best to use a | + | | filter to prevent unwanted events | + | | on the consumer side) | + +-----------------------------------+-----------------------------------+ + | **10** | activate requestor mode | + +-----------------------------------+-----------------------------------+ + | **11** | the peer to the output (must | + | | match the input carrier) | + +-----------------------------------+-----------------------------------+ + | **12** | an optional timeout in | + | | milliseconds | + +-----------------------------------+-----------------------------------+ + +Kafka IO +######## + + .. container:: paragraph + + Kafka IO is supported by the APEX Kafka plugin. The + configurations below are examples. APEX will take any + configuration inside the parameter object and forward it + to Kafka. More information on Kafka specific + configuration parameters can be found in the Kafka + documentation: + + .. container:: ulist + + - `Kafka Consumer + Class <https://kafka.apache.org/090/javadoc/org/apache/kafka/clients/consumer/KafkaConsumer.html>`__ + + - `Kafka Producer + Class <https://kafka.apache.org/090/javadoc/org/apache/kafka/clients/producer/KafkaProducer.html>`__ + +Kafka Input +=========== + .. container:: paragraph + + APEX will receive events from the Apache Kafka + messaging system. The input is uni-directional, an + engine will only receive events from the input but not + send any event to the input. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "carrierTechnologyParameters" : { + "carrierTechnology" : "KAFKA", (1) + "parameterClassName" : + "org.onap.policy.apex.plugins.event.carrier.kafka.KAFKACarrierTechnologyParameters", + "parameters" : { + "bootstrapServers" : "localhost:49092", (2) + "groupId" : "apex-group-id", (3) + "enableAutoCommit" : true, (4) + "autoCommitTime" : 1000, (5) + "sessionTimeout" : 30000, (6) + "consumerPollTime" : 100, (7) + "consumerTopicList" : ["apex-in-0", "apex-in-1"], (8) + "keyDeserializer" : + "org.apache.kafka.common.serialization.StringDeserializer", (9) + "valueDeserializer" : + "org.apache.kafka.common.serialization.StringDeserializer" (10) + } + } + + .. container:: colist arabic + + +--------+-------------------------------------+ + | **1** | set Kafka as carrier technology | + +--------+-------------------------------------+ + | **2** | bootstrap server and port | + +--------+-------------------------------------+ + | **3** | a group identifier | + +--------+-------------------------------------+ + | **4** | flag for auto-commit | + +--------+-------------------------------------+ + | **5** | auto-commit timeout in milliseconds | + +--------+-------------------------------------+ + | **6** | session timeout in milliseconds | + +--------+-------------------------------------+ + | **7** | consumer poll time in milliseconds | + +--------+-------------------------------------+ + | **8** | consumer topic list | + +--------+-------------------------------------+ + | **9** | key for the Kafka de-serializer | + +--------+-------------------------------------+ + | **10** | value for the Kafka de-serializer | + +--------+-------------------------------------+ + +Kafka Output +============ + .. container:: paragraph + + APEX will send events to the Apache Kafka messaging + system. The output is uni-directional, an engine will + send events to the output but not receive any event + from the output. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "carrierTechnologyParameters" : { + "carrierTechnology" : "KAFKA", (1) + "parameterClassName" : + "org.onap.policy.apex.plugins.event.carrier.kafka.KAFKACarrierTechnologyParameters", + "parameters" : { + "bootstrapServers" : "localhost:49092", (2) + "acks" : "all", (3) + "retries" : 0, (4) + "batchSize" : 16384, (5) + "lingerTime" : 1, (6) + "bufferMemory" : 33554432, (7) + "producerTopic" : "apex-out", (8) + "keySerializer" : + "org.apache.kafka.common.serialization.StringSerializer", (9) + "valueSerializer" : + "org.apache.kafka.common.serialization.StringSerializer" (10) + } + } + + .. container:: colist arabic + + +--------+---------------------------------+ + | **1** | set Kafka as carrier technology | + +--------+---------------------------------+ + | **2** | bootstrap server and port | + +--------+---------------------------------+ + | **3** | acknowledgement strategy | + +--------+---------------------------------+ + | **4** | number of retries | + +--------+---------------------------------+ + | **5** | batch size | + +--------+---------------------------------+ + | **6** | time to linger in milliseconds | + +--------+---------------------------------+ + | **7** | buffer memory in byte | + +--------+---------------------------------+ + | **8** | producer topic | + +--------+---------------------------------+ + | **9** | key for the Kafka serializer | + +--------+---------------------------------+ + | **10** | value for the Kafka serializer | + +--------+---------------------------------+ + +JMS IO +####### + + .. container:: paragraph + + APEX supports the Java Messaging Service (JMS) as input + as well as output. JMS IO is supported by the APEX JMS + plugin. Input and output support an event encoding as + text (JSON string) or object (serialized object). The + input configuration is the same for both encodings, the + output configuration differs. + +JMS Input +========= + .. container:: paragraph + + APEX will receive events from a JMS messaging system. + The input is uni-directional, an engine will only + receive events from the input but not send any event + to the input. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "carrierTechnologyParameters" : { + "carrierTechnology" : "JMS", (1) + "parameterClassName" : + "org.onap.policy.apex.plugins.event.carrier.jms.JMSCarrierTechnologyParameters", + "parameters" : { (2) + "initialContextFactory" : + "org.jboss.naming.remote.client.InitialContextFactory", (3) + "connectionFactory" : "ConnectionFactory", (4) + "providerURL" : "remote://localhost:5445", (5) + "securityPrincipal" : "guest", (6) + "securityCredentials" : "IAmAGuest", (7) + "consumerTopic" : "jms/topic/apexIn" (8) + } + } + + .. container:: colist arabic + + +-----------------------------------+-----------------------------------+ + | **1** | set JMS as carrier technology | + +-----------------------------------+-----------------------------------+ + | **2** | set all JMS specific parameters | + +-----------------------------------+-----------------------------------+ + | **3** | the context factory, in this case | + | | from JBOSS (it requires the | + | | dependency | + | | org.jboss:jboss-remote-naming:2.0 | + | | .4.Final | + | | or a different version to be in | + | | the directory ``$APEX_HOME/lib`` | + | | or ``%APEX_HOME%\lib`` | + +-----------------------------------+-----------------------------------+ + | **4** | a connection factory for the JMS | + | | connection | + +-----------------------------------+-----------------------------------+ + | **5** | URL with host and port of the JMS | + | | provider | + +-----------------------------------+-----------------------------------+ + | **6** | access credentials, user name | + +-----------------------------------+-----------------------------------+ + | **7** | access credentials, user password | + +-----------------------------------+-----------------------------------+ + | **8** | the JMS topic to listen to | + +-----------------------------------+-----------------------------------+ + +JMS Output with Text +==================== + + .. container:: paragraph + + APEX engine send events to a JMS messaging system. The + output is uni-directional, an engine will send events + to the output but not receive any event from output. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "carrierTechnologyParameters" : { + "carrierTechnology" : "JMS", (1) + "parameterClassName" : + "org.onap.policy.apex.plugins.event.carrier.jms.JMSCarrierTechnologyParameters", + "parameters" : { (2) + "initialContextFactory" : + "org.jboss.naming.remote.client.InitialContextFactory", (3) + "connectionFactory" : "ConnectionFactory", (4) + "providerURL" : "remote://localhost:5445", (5) + "securityPrincipal" : "guest", (6) + "securityCredentials" : "IAmAGuest", (7) + "producerTopic" : "jms/topic/apexOut", (8) + "objectMessageSending": "false" (9) + } + } + + .. container:: colist arabic + + +-----------------------------------+-----------------------------------+ + | **1** | set JMS as carrier technology | + +-----------------------------------+-----------------------------------+ + | **2** | set all JMS specific parameters | + +-----------------------------------+-----------------------------------+ + | **3** | the context factory, in this case | + | | from JBOSS (it requires the | + | | dependency | + | | org.jboss:jboss-remote-naming:2.0 | + | | .4.Final | + | | or a different version to be in | + | | the directory ``$APEX_HOME/lib`` | + | | or ``%APEX_HOME%\lib`` | + +-----------------------------------+-----------------------------------+ + | **4** | a connection factory for the JMS | + | | connection | + +-----------------------------------+-----------------------------------+ + | **5** | URL with host and port of the JMS | + | | provider | + +-----------------------------------+-----------------------------------+ + | **6** | access credentials, user name | + +-----------------------------------+-----------------------------------+ + | **7** | access credentials, user password | + +-----------------------------------+-----------------------------------+ + | **8** | the JMS topic to write to | + +-----------------------------------+-----------------------------------+ + | **9** | set object messaging to ``false`` | + | | means it sends JSON text | + +-----------------------------------+-----------------------------------+ + +JMS Output with Object +====================== + + .. container:: paragraph + + To configure APEX for JMS objects on the output + interface use the same configuration as above (for + output). Simply change the ``objectMessageSending`` + parameter to ``true``. + +Websocket (WS) IO +######################## + + .. container:: paragraph + + APEX supports the Websockets as input as well as output. + WS IO is supported by the APEX Websocket plugin. This + carrier technology does only support uni-directional + communication. APEX will not send events to a Websocket + input and any event sent to a Websocket output will + result in an error log. + + .. container:: paragraph + + The input can be configured as client (APEX connects to + an existing Websocket server) or server (APEX starts a + Websocket server). The same applies to the output. Input + and output can both use a client or a server + configuration, or separate configurations (input as + client and output as server, input as server and output + as client). Each configuration should use its own + dedicated port to avoid any communication loops. The + configuration of a Websocket client is the same for input + and output. The configuration of a Websocket server is + the same for input and output. + +Websocket Client +================ + + .. container:: paragraph + + APEX will connect to a given Websocket server. As + input, it will receive events from the server but not + send any events. As output, it will send events to the + server and any event received from the server will + result in an error log. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "carrierTechnologyParameters" : { + "carrierTechnology" : "WEBSOCKET", (1) + "parameterClassName" : + "org.onap.policy.apex.plugins.event.carrier.websocket.WEBSOCKETCarrierTechnologyParameters", + "parameters" : { + "host" : "localhost", (2) + "port" : 42451 (3) + } + } + + .. container:: colist arabic + + +-------+------------------------------------------------------+ + | **1** | set Websocket as carrier technology | + +-------+------------------------------------------------------+ + | **2** | the host name on which a Websocket server is running | + +-------+------------------------------------------------------+ + | **3** | the port of that Websocket server | + +-------+------------------------------------------------------+ + +Websocket Server +================ + + .. container:: paragraph + + APEX will start a Websocket server, which will accept + any Websocket clients to connect. As input, it will + receive events from the server but not send any + events. As output, it will send events to the server + and any event received from the server will result in + an error log. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "carrierTechnologyParameters" : { + "carrierTechnology" : "WEBSOCKET", (1) + "parameterClassName" : + "org.onap.policy.apex.plugins.event.carrier.websocket.WEBSOCKETCarrierTechnologyParameters", + "parameters" : { + "wsClient" : false, (2) + "port" : 42450 (3) + } + } + + .. container:: colist arabic + + +-------+------------------------------------------------------------+ + | **1** | set Websocket as carrier technology | + +-------+------------------------------------------------------------+ + | **2** | disable client, so that APEX will start a Websocket server | + +-------+------------------------------------------------------------+ + | **3** | the port for the Websocket server APEX will start | + +-------+------------------------------------------------------------+ + +REST Client IO +############## + + .. container:: paragraph + + APEX can act as REST client on the input as well as on + the output interface. The media type is + ``application/json``, so this plugin does only work with + the JSON Event protocol. + +REST Client Input +================= + + .. container:: paragraph + + APEX will connect to a given URL to receive events, + but not send any events. The server is polled, i.e. + APEX will do an HTTP GET, take the result, and then do + the next GET. Any required timing needs to be handled + by the server configured via the URL. For instance, + the server could support a wait timeout via the URL as + ``?timeout=100ms``. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "carrierTechnologyParameters" : { + "carrierTechnology" : "RESTCLIENT", (1) + "parameterClassName" : + "org.onap.policy.apex.plugins.event.carrier.restclient.RESTClientCarrierTechnologyParameters", + "parameters" : { + "url" : "http://example.org:8080/triggers/events", (2) + } + } + + .. container:: colist arabic + + +-------+---------------------------------------+ + | **1** | set REST client as carrier technology | + +-------+---------------------------------------+ + | **2** | the URL of the HTTP server for events | + +-------+---------------------------------------+ + +REST Client Output +================== + + .. container:: paragraph + + APEX will connect to a given URL to send events, but + not receive any events. The default HTTP operation is + POST (no configuration required). To change it to PUT + simply add the configuration parameter (as shown in + the example below). + + .. container:: listingblock + + .. container:: content + + .. code:: + + "carrierTechnologyParameters" : { + "carrierTechnology" : "RESTCLIENT", (1) + "parameterClassName" : + "org.onap.policy.apex.plugins.event.carrier.restclient.RESTClientCarrierTechnologyParameters", + "parameters" : { + "url" : "http://example.com:8888/actions/events", (2) + "httpMethod" : "PUT" (3) + } + } + + .. container:: colist arabic + + +-------+--------------------------------------------------+ + | **1** | set REST client as carrier technology | + +-------+--------------------------------------------------+ + | **2** | the URL of the HTTP server for events | + +-------+--------------------------------------------------+ + | **3** | use HTTP PUT (remove this line to use HTTP POST) | + +-------+--------------------------------------------------+ + +REST Server IO +############## + + .. container:: paragraph + + APEX supports a REST server for input and output. + + .. container:: paragraph + + The REST server plugin always uses a synchronous mode. A + client does a HTTP GET on the APEX REST server with the + input event and receives the generated output event in + the server reply. This means that for the REST server + there has to always to be an input with an associated + output. Input or output only are not permitted. + + .. container:: paragraph + + The plugin will start a Grizzly server as REST server for + a normal APEX engine. If the APEX engine is executed as a + servlet, for instance inside Tomcat, then Tomcat will be + used as REST server (this case requires configuration on + Tomcat as well). + + .. container:: paragraph + + Some configuration restrictions apply for all scenarios: + + .. container:: ulist + + - Minimum port: 1024 + + - Maximum port: 65535 + + - The media type is ``application/json``, so this plugin + does only work with the JSON Event protocol. + + .. container:: paragraph + + The URL the client calls is created using + + .. container:: ulist + + - the configured host and port, e.g. + ``http://localhost:12345`` + + - the standard path, e.g. ``/apex/`` + + - the name of the input/output, e.g. ``FirstConsumer/`` + + - the input or output name, e.g. ``EventIn``. + + .. container:: paragraph + + The examples above lead to the URL + ``http://localhost:12345/apex/FirstConsumer/EventIn``. + + .. container:: paragraph + + A client can also get status information of the REST + server using ``/Status``, e.g. + ``http://localhost:12345/apex/FirstConsumer/Status``. + +REST Server Stand-alone +======================= + + .. container:: paragraph + + We need to configure a REST server input and a REST + server output. Input and output are associated with + each other via there name. + + .. container:: paragraph + + Timeouts for REST calls need to be set carefully. If + they are too short, the call might timeout before a + policy finished creating an event. + + .. container:: paragraph + + The following example configures the input named as + ``MyConsumer`` and associates an output named + ``MyProducer`` with it. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "eventInputParameters": { + "MyConsumer": { + "carrierTechnologyParameters" : { + "carrierTechnology" : "RESTSERVER", (1) + "parameterClassName" : + "org.onap.policy.apex.plugins.event.carrier.restserver.RESTServerCarrierTechnologyParameters", + "parameters" : { + "standalone" : true, (2) + "host" : "localhost", (3) + "port" : 12345 (4) + } + }, + "eventProtocolParameters":{ + "eventProtocol" : "JSON" (5) + }, + "synchronousMode" : true, (6) + "synchronousPeer" : "MyProducer", (7) + "synchronousTimeout" : 500 (8) + } + } + + .. container:: colist arabic + + +-------+---------------------------------------+ + | **1** | set REST server as carrier technology | + +-------+---------------------------------------+ + | **2** | set the server as stand-alone | + +-------+---------------------------------------+ + | **3** | set the server host | + +-------+---------------------------------------+ + | **4** | set the server listen port | + +-------+---------------------------------------+ + | **5** | use JSON event protocol | + +-------+---------------------------------------+ + | **6** | activate synchronous mode | + +-------+---------------------------------------+ + | **7** | associate an output ``MyProducer`` | + +-------+---------------------------------------+ + | **8** | set a timeout of 500 milliseconds | + +-------+---------------------------------------+ + + .. container:: paragraph + + The following example configures the output named as + ``MyProducer`` and associates the input ``MyConsumer`` + with it. Note that for the output there are no more + paramters (such as host or port), since they are + already configured in the associated input + + .. container:: listingblock + + .. container:: content + + .. code:: + + "eventOutputParameters": { + "MyProducer": { + "carrierTechnologyParameters":{ + "carrierTechnology" : "RESTSERVER", + "parameterClassName" : + "org.onap.policy.apex.plugins.event.carrier.restserver.RESTServerCarrierTechnologyParameters" + }, + "eventProtocolParameters":{ + "eventProtocol" : "JSON" + }, + "synchronousMode" : true, + "synchronousPeer" : "MyConsumer", + "synchronousTimeout" : 500 + } + } + +REST Server Stand-alone, multi input +==================================== + + .. container:: paragraph + + Any number of input/output pairs for REST servers can + be configured. For instance, we can configure an input + ``FirstConsumer`` with output ``FirstProducer`` and an + input ``SecondConsumer`` with output + ``SecondProducer``. Important is that there is always + one pair of input/output. + +REST Server Stand-alone in Servlet +================================== + + .. container:: paragraph + + If APEX is executed as a servlet, e.g. inside Tomcat, + the configuration becomes easier since the plugin can + now use Tomcat as the REST server. In this scenario, + there are not parameters (port, host, etc.) and the + key ``standalone`` must not be used (or set to false). + + .. container:: paragraph + + For the Tomcat configuration, we need to add the REST + server plugin, e.g. + + .. container:: listingblock + + .. container:: content + + .. code:: + + <servlet> + ... + <init-param> + ... + <param-value>org.onap.policy.apex.plugins.event.carrier.restserver</param-value> + </init-param> + ... + </servlet> + +REST Requestor IO +################## + + .. container:: paragraph + + APEX can act as REST requestor on the input as well as on + the output interface. The media type is + ``application/json``, so this plugin does only work with + the JSON Event protocol. + +REST Requestor Input +==================== + + .. container:: paragraph + + APEX will connect to a given URL to request an input. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "carrierTechnologyParameters": { + "carrierTechnology": "RESTREQUESTOR", (1) + "parameterClassName": "org.onap.policy.apex.plugins.event.carrier.restrequestor.RESTRequestorCarrierTechnologyParameters", + "parameters": { + "url": "http://localhost:54321/some/path/to/rest/resource", (2) + "httpMethod": "POST", (3) + "restRequestTimeout": 2000 (4) + } + }, + + .. container:: colist arabic + + +-------+--------------------------------------------------+ + | **1** | set REST requestor as carrier technology | + +-------+--------------------------------------------------+ + | **2** | the URL of the HTTP server for events | + +-------+--------------------------------------------------+ + | **3** | use HTTP PUT (remove this line to use HTTP POST) | + +-------+--------------------------------------------------+ + | **4** | request timeout in milliseconds | + +-------+--------------------------------------------------+ + + .. container:: paragraph + + Further settings are required on the consumer to + define the event that is requested, for example: + + .. container:: listingblock + + .. container:: content + + .. code:: + + "eventName": "GuardResponseEvent", (1) + "eventNameFilter": "GuardResponseEvent", (2) + "requestorMode": true, (3) + "requestorPeer": "GuardRequestorProducer", (4) + "requestorTimeout": 500 (5) + + .. container:: colist arabic + + +-------+---------------------------+ + | **1** | the event name | + +-------+---------------------------+ + | **2** | a filter on the event | + +-------+---------------------------+ + | **3** | the mode of the requestor | + +-------+---------------------------+ + | **4** | a peer for the requestor | + +-------+---------------------------+ + | **5** | a general request timeout | + +-------+---------------------------+ + +REST Requestor Output +===================== + + .. container:: paragraph + + APEX will connect to a given URL to send events, but + not receive any events. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "carrierTechnologyParameters": { + "carrierTechnology": "RESTREQUESTOR", (1) + "parameterClassName": "org.onap.policy.apex.plugins.event.carrier.restrequestor.RESTRequestorCarrierTechnologyParameters" + }, + + .. container:: colist arabic + + +-------+------------------------------------------+ + | **1** | set REST requestor as carrier technology | + +-------+------------------------------------------+ + + .. container:: paragraph + + Further settings are required on the consumer to + define the event that is requested, for example: + + .. container:: listingblock + + .. container:: content + + .. code:: + + "eventNameFilter": "GuardRequestEvent", (1) + "requestorMode": true, (2) + "requestorPeer": "GuardRequestorConsumer", (3) + "requestorTimeout": 500 (4) + + .. container:: colist arabic + + +-------+---------------------------+ + | **1** | a filter on the event | + +-------+---------------------------+ + | **2** | the mode of the requestor | + +-------+---------------------------+ + | **3** | a peer for the requestor | + +-------+---------------------------+ + | **4** | a general request timeout | + +-------+---------------------------+ + +Event Protocols, Format and Encoding +------------------------------------ + + .. container:: paragraph + + Event protocols define what event formats APEX can receive + (input) and should send (output). They can be used in any + combination for input and output, unless further restricted + by a carrier technology plugin (for instance for JMS + output). There can only be 1 event protocol per event + plugin. + + .. container:: paragraph + + Supported *input* event protocols are: + + .. container:: ulist + + - JSON, the event as a JSON string + + - APEX, an APEX event + + - JMS object, the event as a JMS object, + + - JMS text, the event as a JMS text, + + - XML, the event as an XML string, + + - YAML, the event as YAML text + + .. container:: paragraph + + Supported *output* event protocols are: + + .. container:: ulist + + - JSON, the event as a JSON string + + - APEX, an APEX event + + - JMS object, the event as a JMS object, + + - JMS text, the event as a JMS text, + + - XML, the event as an XML string, + + - YAML, the event as YAML text + + .. container:: paragraph + + New event protocols can be added as plugins to APEX or + developed outside APEX and added to an APEX deployment. + +JSON Event +########## + + .. container:: paragraph + + The event protocol for JSON encoding does not require a + specific plugin, it is supported by default. Furthermore, + there is no difference in the configuration for the input + and output interface. + + .. container:: paragraph + + For an input, APEX requires a well-formed JSON string. + Well-formed here means according to the definitions of a + policy. Any JSON string that is not defined as a trigger + event (consume) will not be consumed (errors will be + thrown). For output JSON events, APEX will always produce + valid JSON strings according to the definition in the + policy model. + + .. container:: paragraph + + The following JSON shows the configuration. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "eventProtocolParameters":{ + "eventProtocol" : "JSON" + } + + .. container:: paragraph + + For JSON events, there are a few more optional + parameters, which allow to define a mapping for standard + event fields. An APEX event must have the fields + ``name``, ``version``, ``source``, and ``target`` + defined. Sometimes it is not possible to configure a + trigger or actioning system to use those fields. However, + they might be in an event generated outside APEX (or used + outside APEX) just with different names. To configure + APEX to map between the different event names, simply add + the following parameters to a JSON event: + + .. container:: listingblock + + .. container:: content + + .. code:: + + "eventProtocolParameters":{ + "eventProtocol" : "JSON", + "nameAlias" : "policyName", (1) + "versionAlias" : "policyVersion", (2) + "sourceAlias" : "from", (3) + "targetAlias" : "to", (4) + "nameSpaceAlias": "my.name.space" (5) + } + + .. container:: colist arabic + + +-----------------------------------+-----------------------------------+ + | **1** | mapping for the ``name`` field, | + | | here from a field called | + | | ``policyName`` | + +-----------------------------------+-----------------------------------+ + | **2** | mapping for the ``version`` | + | | field, here from a field called | + | | ``policyVersion`` | + +-----------------------------------+-----------------------------------+ + | **3** | mapping for the ``source`` field, | + | | here from a field called ``from`` | + | | (only for an input event) | + +-----------------------------------+-----------------------------------+ + | **4** | mapping for the ``target`` field, | + | | here from a field called ``to`` | + | | (only for an output event) | + +-----------------------------------+-----------------------------------+ + | **5** | mapping for the ``nameSpace`` | + | | field, here from a field called | + | | ``my.name.space`` | + +-----------------------------------+-----------------------------------+ + +APEX Event +########## + .. container:: paragraph + + The event protocol for APEX events does not require a + specific plugin, it is supported by default. Furthermore, + there is no difference in the configuration for the input + and output interface. + + .. container:: paragraph + + For input and output APEX uses APEX events. + + .. container:: paragraph + + The following JSON shows the configuration. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "eventProtocolParameters":{ + "eventProtocol" : "APEX" + } + +JMS Event +######### + + .. container:: paragraph + + The event protocol for JMS is provided by the APEX JMS + plugin. The plugin supports encoding as JSON text or as + object. There is no difference in the configuration for + the input and output interface. + +JMS Text +======== + .. container:: paragraph + + If used as input, APEX will take a JMS message and + extract a JSON string, then proceed as if a JSON event + was received. If used as output, APEX will take the + event produced by a policy, create a JSON string, and + then wrap it into a JMS message. + + .. container:: paragraph + + The configuration for JMS text is as follows: + + .. container:: listingblock + + .. container:: content + + .. code:: + + "eventProtocolParameters":{ + "eventProtocol" : "JMSTEXT", + "parameterClassName" : + "org.onap.policy.apex.plugins.event.protocol.jms.JMSTextEventProtocolParameters" + } + +JMS Object +========== + .. container:: paragraph + + If used as input, APEX will will take a JMS message, + extract a Java Bean from the ``ObjectMessage`` + message, construct an APEX event and put the bean on + the APEX event as a parameter. If used as output, APEX + will take the event produced by a policy, create a + Java Bean and send it as a JMS message. + + .. container:: paragraph + + The configuration for JMS object is as follows: + + .. container:: listingblock + + .. container:: content + + .. code:: + + "eventProtocolParameters":{ + "eventProtocol" : "JMSOBJECT", + "parameterClassName" : + "org.onap.policy.apex.plugins.event.protocol.jms.JMSObjectEventProtocolParameters" + } + +YAML Event +########## + + .. container:: paragraph + + The event protocol for YAML is provided by the APEX YAML + plugin. There is no difference in the configuration for + the input and output interface. + + .. container:: paragraph + + If used as input, APEX will consume events as YAML and + map them to policy trigger events. Not well-formed YAML + and not understood trigger events will be rejected. If + used as output, APEX produce YAML encoded events from the + event a policy produces. Those events will always be + well-formed according to the definition in the policy + model. + + .. container:: paragraph + + The following code shows the configuration. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "eventProtocolParameters":{ + "eventProtocol" : "XML", + "parameterClassName" : + "org.onap.policy.apex.plugins.event.protocol.yaml.YamlEventProtocolParameters" + } + +XML Event +######### + .. container:: paragraph + + The event protocol for XML is provided by the APEX XML + plugin. There is no difference in the configuration for + the input and output interface. + + .. container:: paragraph + + If used as input, APEX will consume events as XML and map + them to policy trigger events. Not well-formed XML and + not understood trigger events will be rejected. If used + as output, APEX produce XML encoded events from the event + a policy produces. Those events will always be + well-formed according to the definition in the policy + model. + + .. container:: paragraph + + The following code shows the configuration. + + .. container:: listingblock + + .. container:: content + + .. code:: + + "eventProtocolParameters":{ + "eventProtocol" : "XML", + "parameterClassName" : + "org.onap.policy.apex.plugins.event.protocol.xml.XMLEventProtocolParameters" + } + +A configuration example +----------------------- + + .. container:: paragraph + + The following example loads all available plug-ins. + + .. container:: paragraph + + Events are consumed from a Websocket, APEX as client. + Consumed event format is JSON. + + .. container:: paragraph + + Events are produced to Kafka. Produced event format is XML. + + .. container:: listingblock + + .. container:: content + + .. code:: + + { + "engineServiceParameters" : { + "name" : "MyApexEngine", + "version" : "0.0.1", + "id" : 45, + "instanceCount" : 4, + "deploymentPort" : 12345, + "policyModelFileName" : "examples/models/some-model.json", + "engineParameters" : { + "executorParameters" : { + "JAVASCRIPT" : { + "parameterClassName" : + "org.onap.policy.apex.plugins.executor.javascript.JavascriptExecutorParameters" + }, + "JYTHON" : { + "parameterClassName" : + "org.onap.policy.apex.plugins.executor.jython.JythonExecutorParameters" + }, + "JRUBY" : { + "parameterClassName" : + "org.onap.policy.apex.plugins.executor.jruby.JrubyExecutorParameters" + }, + "JAVA" : { + "parameterClassName" : + "org.onap.policy.apex.plugins.executor.java.JavaExecutorParameters" + }, + "MVEL" : { + "parameterClassName" : + "org.onap.policy.apex.plugins.executor.mvel.MVELExecutorParameters" + } + }, + "contextParameters" : { + "parameterClassName" : + "org.onap.policy.apex.context.parameters.ContextParameters", + "schemaParameters" : { + "Avro":{ + "parameterClassName" : + "org.onap.policy.apex.plugins.context.schema.avro.AvroSchemaHelperParameters" + } + } + } + } + }, + "producerCarrierTechnologyParameters" : { + "carrierTechnology" : "KAFKA", + "parameterClassName" : + "org.onap.policy.apex.plugins.event.carrier.kafka.KAFKACarrierTechnologyParameters", + "parameters" : { + "bootstrapServers" : "localhost:49092", + "acks" : "all", + "retries" : 0, + "batchSize" : 16384, + "lingerTime" : 1, + "bufferMemory" : 33554432, + "producerTopic" : "apex-out", + "keySerializer" : "org.apache.kafka.common.serialization.StringSerializer", + "valueSerializer" : "org.apache.kafka.common.serialization.StringSerializer" + } + }, + "producerEventProtocolParameters" : { + "eventProtocol" : "XML", + "parameterClassName" : + "org.onap.policy.apex.plugins.event.protocol.xml.XMLEventProtocolParameters" + }, + "consumerCarrierTechnologyParameters" : { + "carrierTechnology" : "WEBSOCKET", + "parameterClassName" : + "org.onap.policy.apex.plugins.event.carrier.websocket.WEBSOCKETCarrierTechnologyParameters", + "parameters" : { + "host" : "localhost", + "port" : 88888 + } + }, + "consumerEventProtocolParameters" : { + "eventProtocol" : "JSON" + } + } + +Engine and Applications of the APEX System +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Introduction to APEX Engine and Applications +-------------------------------------------- + + .. container:: paragraph + + The core of APEX is the APEX Engine, also known as the APEX + Policy Engine or the APEX PDP (since it is in fact a Policy + Decision Point). Beside this engine, an APEX system comes + with a few applications intended to help with policy + authoring, deployment, and execution. + + .. container:: paragraph + + The engine itself and most applications are started from the + command line with command line arguments. This is called a + Command Line Interface (CLI). Some applications require an + installation on a webserver, as for instance the REST + Editor. Those applications can be accessed via a web + browser. + + .. container:: paragraph + + You can also use the available APEX APIs and applications to + develop other applications as required. This includes policy + languages (and associated parsers and compilers / + interpreters), GUIs to access APEX or to define policies, + clients to connect to APEX, etc. + + .. container:: paragraph + + For this documentation, we assume an installation of APEX as + a full system based on a current ONAP release. + +CLI on Unix, Windows, and Cygwin +-------------------------------- + + .. container:: paragraph + + A note on APEX CLI applications: all applications and the + engine itself have been deployed and tested on different + operating systems: Red Hat, Ubuntu, Debian, Mac OSX, + Windows, Cygwin. Each operating system comes with its own + way of configuring and executing Java. The main items here + are: + + .. container:: ulist + + - For UNIX systems (RHL, Ubuntu, Debian, Mac OSX), the + provided bash scripts work as expected with absolute + paths (e.g. + ``/opt/app/policy/apex-pdp/apex-pdp-2.0.0-SNAPSHOT/examples``), + indirect and linked paths (e.g. ``../apex/apex``), and + path substitutions using environment settings (e.g. + ``$APEX_HOME/bin/``) + + - For Windows systems, the provided batch files (``.bat``) + work as expected with with absolute paths (e.g. + ``C:\apex\apex-2.0.0-SNAPSHOT\examples``), and path + substitutions using environment settings (e.g. + ``%APEX_HOME%\bin\``) + + - For Cygwin system we assume a standard Cygwin + installation with standard tools (mainly bash) using a + Windows Java installation. This means that the bash + scripts can be used as in UNIX, however any argument + pointing to files and directories need to use either a + DOS path (e.g. + ``C:\apex\apex-2.0.0-SNAPSHOT\examples\config...``) or + the command ``cygpath`` with a mixed option. The reason + for that is: Cygwin executes Java using UNIX paths but + then runs Java as a DOS/WINDOWS process, which requires + DOS paths for file access. + +The APEX Engine +--------------- + + .. container:: paragraph + + The APEX engine can be started in different ways, depending + your requirements. All scripts are located in the APEX *bin* + directory + + .. container:: paragraph + + On UNIX and Cygwin systems use: + + .. container:: ulist + + - ``apexEngine.sh`` - this script will + + .. container:: ulist + + - Test if ``$APEX_USER`` is set and if the user + exists, terminate with an error otherwise + + - Test if ``$APEX_HOME`` is set. If not set, it will + use the default setting as + ``/opt/app/policy/apex-pdp/apex-pdp``. Then the set + directory is tested to exist, the script will + terminate if not. + + - When all tests are passed successfully, the script + will call ``apexApps.sh`` with arguments to start + the APEX engine. + + - ``apexApps.sh engine`` - this is the general APEX + application launcher, which will + + .. container:: ulist + + - Start the engine with the argument ``engine`` + + - Test if ``$APEX_HOME`` is set and points to an + existing directory. If not set or directory does + not exist, script terminates. + + - Not test for any settings of ``$APEX_USER``. + + .. container:: paragraph + + On Windows systems use ``apexEngine.bat`` and + ``apexApps.bat engine`` respectively. Note: none of the + windows batch files will test for ``%APEX_USER%``. + + .. container:: paragraph + + Summary of alternatives to start the APEX Engine: + + +--------------------------------------------------------+----------------------------------------------------------+ + | Unix, Cygwin | Windows | + +========================================================+==========================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: listingblock | .. container:: listingblock | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: | .. code:: | + | | | + | # $APEX_HOME/bin/apexEngine.sh [args] | > %APEX_HOME%\bin\apexEngine.bat [args] | + | # $APEX_HOME/bin/apexApps.sh engine [args] | > %APEX_HOME%\bin\apexApps.bat engine [args] | + +--------------------------------------------------------+----------------------------------------------------------+ + + .. container:: paragraph + + The APEX engine comes with a few CLI arguments for setting + configuration and policy model. The configuration file is + always required. The policy model file is only required if + no model file is specified in the configuration, or if the + specified model file should be over written. The option + ``-h`` prints a help screen. + + .. container:: listingblock + + .. container:: content + + .. code:: + + usage: org.onap.policy.apex.service.engine.main.ApexMain [options...] + options + -c,--config-file <CONFIG_FILE> the full path to the configuration file to use, the configuration file must be a Json file + containing the Apex configuration parameters + -h,--help outputs the usage of this command + -m,--model-file <MODEL_FILE> the full path to the model file to use, if set it overrides the model file set in the + configuration file + -v,--version outputs the version of Apex + +The APEX CLI Editor +------------------- + + .. container:: paragraph + + The CLI Editor allows to define policies from the command + line. The application uses a simple language and supports + all elements of an APEX policy. It can be used in to + different ways: + + .. container:: ulist + + - non-interactive, specifying a file with the commands to + create a policy + + - interactive, using the editors CLI to create a policy + + .. container:: paragraph + + When a policy is fully specified, the editor will generate + the APEX core policy specification in JSON. This core + specification is called the policy model in the APEX engine + and can be used directly with the APEX engine. + + .. container:: paragraph + + On UNIX and Cygwin systems use: + + .. container:: ulist + + - ``apexCLIEditor.sh`` - simply starts the CLI editor, + arguments to the script determine the mode of the editor + + - ``apexApps.sh cli-editor`` - simply starts the CLI + editor, arguments to the script determine the mode of the + editor + + .. container:: paragraph + + On Windows systems use: + + .. container:: ulist + + - ``apexCLIEditor.bat`` - simply starts the CLI editor, + arguments to the script determine the mode of the editor + + - ``apexApps.bat cli-editor`` - simply starts the CLI + editor, arguments to the script determine the mode of the + editor + + .. container:: paragraph + + Summary of alternatives to start the APEX CLI Editor: + + +------------------------------------------------------------+--------------------------------------------------------------+ + | Unix, Cygwin | Windows | + +============================================================+==============================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: listingblock | .. container:: listingblock | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: | .. code:: | + | | | + | # $APEX_HOME/bin/apexCLIEditor.sh.sh [args] | > %APEX_HOME%\bin\apexCLIEditor.bat [args] | + | # $APEX_HOME/bin/apexApps.sh cli-editor [args] | > %APEX_HOME%\bin\apexApps.bat cli-editor [args] | + +------------------------------------------------------------+--------------------------------------------------------------+ + + .. container:: paragraph + + The option ``-h`` provides a help screen with all command + line arguments. + + .. container:: listingblock + + .. container:: content + + .. code:: + + usage: org.onap.policy.apex.auth.clieditor.ApexCLIEditorMain [options...] + options + -a,--model-props-file <MODEL_PROPS_FILE> name of the apex model properties file to use + -c,--command-file <COMMAND_FILE> name of a file containing editor commands to run into the editor + -h,--help outputs the usage of this command + -i,--input-model-file <INPUT_MODEL_FILE> name of a file that contains an input model for the editor + -if,--ignore-failures <IGNORE_FAILURES_FLAG> true or false, ignore failures of commands in command files and continue + executing the command file + -l,--log-file <LOG_FILE> name of a file that will contain command logs from the editor, will log + to standard output if not specified or suppressed with "-nl" flag + -m,--metadata-file <CMD_METADATA_FILE> name of the command metadata file to use + -nl,--no-log if specified, no logging or output of commands to standard output or log + file is carried out + -nm,--no-model-output if specified, no output of a model to standard output or model output + file is carried out, the user can use the "save" command in a script to + save a model + -o,--output-model-file <OUTPUT_MODEL_FILE> name of a file that will contain the output model for the editor, will + output model to standard output if not specified or suppressed with + "-nm" flag + -wd,--working-directory <WORKING_DIRECTORY> the working directory that is the root for the CLI editor and is the + root from which to look for included macro files + +The APEX REST Editor +-------------------- + + .. container:: paragraph + + The standard way to use the APEX REST Editor is via an + installation of the *war* file on a webserver. However, the + REST editor can also be started via command line. This will + start a Grizzly webserver with the *war* deployed. Access to + the REST Editor is then via the provided URL + + .. container:: paragraph + + On UNIX and Cygwin systems use: + + .. container:: ulist + + - ``apexRESTEditor.sh`` - simply starts the webserver with + the REST editor + + - ``apexApps.sh rest-editor`` - simply starts the webserver + with the REST editor + + .. container:: paragraph + + On Windows systems use: + + .. container:: ulist + + - ``apexRESTEditor.bat`` - simply starts the webserver with + the REST editor + + - ``apexApps.bat rest-editor`` - simply starts the + webserver with the REST editor + + .. container:: paragraph + + Summary of alternatives to start the APEX REST Editor: + + +-------------------------------------------------------------+---------------------------------------------------------------+ + | Unix, Cygwin | Windows | + +=============================================================+===============================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: listingblock | .. container:: listingblock | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: | .. code:: | + | | | + | # $APEX_HOME/bin/apexRESTEditor.sh.sh [args] | > %APEX_HOME%\bin\apexRESTEditor.bat [args] | + | # $APEX_HOME/bin/apexApps.sh rest-editor [args] | > %APEX_HOME%\bin\apexApps.bat rest-editor [args] | + +-------------------------------------------------------------+---------------------------------------------------------------+ + + .. container:: paragraph + + The option ``-h`` provides a help screen with all command + line arguments. + + .. container:: listingblock + + .. container:: content + + .. code:: + + usage: org.onap.policy.apex.client.editor.rest.ApexEditorMain [options...] + -h,--help outputs the usage of this command + -l,--listen <ADDRESS> the IP address to listen on. Default value is localhost to restrict access to the + local machine only. + -p,--port <PORT> port to use for the Apex RESTful editor REST calls. + -t,--time-to-live <TIME_TO_LIVE> the amount of time in seconds that the server will run for before terminating. Default + value is -1 to run indefinitely. + + .. container:: paragraph + + If the REST Editor is started without any arguments the + final messages will look similar to this: + + .. container:: listingblock + + .. container:: content + + .. code:: + + Apex Editor REST endpoint (ApexEditorMain: Config=[ApexEditorParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=READY) starting at http://localhost:18989/apexservices/ . . . + Sep 05, 2018 11:24:30 PM org.glassfish.grizzly.http.server.NetworkListener start + INFO: Started listener bound to [localhost:18989] + Sep 05, 2018 11:24:30 PM org.glassfish.grizzly.http.server.HttpServer start + INFO: [HttpServer] Started. + Apex Editor REST endpoint (ApexEditorMain: Config=[ApexEditorParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=RUNNING) started at http://localhost:18989/apexservices/ + + .. container:: paragraph + + The last line states the URL on which the REST Editor can be + accessed. The example above stated + ``http://0.0.0.0:18989/apex/``. In a web browser use the URL + ``http://localhost:18989`` and the REST Editor will start. + +The APEX Monitoring Client +-------------------------- + + .. container:: paragraph + + The standard way to use the APEX Monitoring Client is via an + installation of the *war* file on a webserver. However, the + Monitoring Client can also be started via command line. This + will start a Grizzly webserver with the *war* deployed. + Access to the Monitoring Client is then via the provided URL + + .. container:: paragraph + + On UNIX and Cygwin systems use: + + .. container:: ulist + + - ``apexApps.sh eng-monitoring`` - simply starts the + webserver with the Monitoring Client + + .. container:: paragraph + + On Windows systems use: + + .. container:: ulist + + - ``apexApps.bat eng-monitoring`` - simply starts the + webserver with the Monitoring Client + + .. container:: paragraph + + The option ``-h`` provides a help screen with all command + line arguments. + + .. container:: listingblock + + .. container:: content + + .. code:: + + usage: org.onap.policy.apex.client.monitoring.rest.ApexMonitoringRestMain [options...] + -h,--help outputs the usage of this command + -p,--port <PORT> port to use for the Apex Services REST calls + -t,--time-to-live <TIME_TO_LIVE> the amount of time in seconds that the server will run for before terminating + + .. container:: paragraph + + If the Monitoring Client is started without any arguments + the final messages will look similar to this: + + .. container:: listingblock + + .. container:: content + + .. code:: + + Apex Services REST endpoint (ApexMonitoringRestMain: Config=[ApexMonitoringRestParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=READY) starting at http://localhost:18989/apexservices/ . . . + Sep 05, 2018 11:26:20 PM org.glassfish.grizzly.http.server.NetworkListener start + INFO: Started listener bound to [localhost:18989] + Sep 05, 2018 11:26:20 PM org.glassfish.grizzly.http.server.HttpServer start + INFO: [HttpServer] Started. + Apex Services REST endpoint (ApexMonitoringRestMain: Config=[ApexMonitoringRestParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=RUNNING) started at http://localhost:18989/apexservices/ + + .. container:: paragraph + + The last line states the URL on which the Monitoring Client + can be accessed. The example above stated + ``http://localhost:18989/apexservices``. In a web browser + use the URL ``http://localhost:18989``. + +The APEX Deployment Client +-------------------------- + + .. container:: paragraph + + The standard way to use the APEX Deployment Client is via an + installation of the *war* file on a webserver. However, the + Deployment Client can also be started via command line. This + will start a Grizzly webserver with the *war* deployed. + Access to the Deployment Client is then via the provided URL + + .. container:: paragraph + + On UNIX and Cygwin systems use: + + .. container:: ulist + + - ``apexApps.sh eng-deployment`` - simply starts the + webserver with the Deployment Client + + .. container:: paragraph + + On Windows systems use: + + .. container:: ulist + + - ``apexApps.bat eng-deployment`` - simply starts the + webserver with the Deployment Client + + .. container:: paragraph + + The option ``-h`` provides a help screen with all command + line arguments. + + .. container:: listingblock + + .. container:: content + + .. code:: + + usage: org.onap.policy.apex.client.deployment.rest.ApexDeploymentRestMain [options...] + -h,--help outputs the usage of this command + -p,--port <PORT> port to use for the Apex Services REST calls + -t,--time-to-live <TIME_TO_LIVE> the amount of time in seconds that the server will run for before terminating + + .. container:: paragraph + + If the Deployment Client is started without any arguments + the final messages will look similar to this: + + .. container:: listingblock + + .. container:: content + + .. code:: + + Apex Services REST endpoint (ApexDeploymentRestMain: Config=[ApexDeploymentRestParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=READY) starting at http://localhost:18989/apexservices/ . . . + Sep 05, 2018 11:27:09 PM org.glassfish.grizzly.http.server.NetworkListener start + INFO: Started listener bound to [localhost:18989] + Sep 05, 2018 11:27:09 PM org.glassfish.grizzly.http.server.HttpServer start + INFO: [HttpServer] Started. + Apex Services REST endpoint (ApexDeploymentRestMain: Config=[ApexDeploymentRestParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=RUNNING) started at http://localhost:18989/apexservices/ + + .. container:: paragraph + + The last line states the URL on which the Deployment Client + can be accessed. The example above stated + ``http://localhost:18989/apexservices``. In a web browser + use the URL ``http://localhost:18989``. + +The APEX Full Client +-------------------- + + .. container:: paragraph + + The APEX Full Client combines the REST Editor, the + Monitoring Client, and the Deployment Client into a single + application. The standard way to use the APEX Full Client is + via an installation of the *war* file on a webserver. + However, the Full Client can also be started via command + line. This will start a Grizzly webserver with the *war* + deployed. Access to the Full Client is then via the provided + URL + + .. container:: paragraph + + On UNIX and Cygwin systems use: + + .. container:: ulist + + - ``apexApps.sh full-client`` - simply starts the webserver + with the Full Client + + .. container:: paragraph + + On Windows systems use: + + .. container:: ulist + + - ``apexApps.bat full-client`` - simply starts the + webserver with the Full Client + + .. container:: paragraph + + The option ``-h`` provides a help screen with all command + line arguments. + + .. container:: listingblock + + .. container:: content + + .. code:: + + usage: org.onap.policy.apex.client.full.rest.ApexServicesRestMain [options...] + -h,--help outputs the usage of this command + -p,--port <PORT> port to use for the Apex Services REST calls + -t,--time-to-live <TIME_TO_LIVE> the amount of time in seconds that the server will run for before terminating + + .. container:: paragraph + + If the Full Client is started without any arguments the + final messages will look similar to this: + + .. container:: listingblock + + .. container:: content + + .. code:: + + Apex Editor REST endpoint (ApexServicesRestMain: Config=[ApexServicesRestParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=READY) starting at http://localhost:18989/apexservices/ . . . + Sep 05, 2018 11:28:28 PM org.glassfish.grizzly.http.server.NetworkListener start + INFO: Started listener bound to [localhost:18989] + Sep 05, 2018 11:28:28 PM org.glassfish.grizzly.http.server.HttpServer start + INFO: [HttpServer] Started. + Apex Editor REST endpoint (ApexServicesRestMain: Config=[ApexServicesRestParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=RUNNING) started at http://localhost:18989/apexservices/ + + .. container:: paragraph + + The last line states the URL on which the Monitoring Client + can be accessed. The example above stated + ``http://localhost:18989/apexservices``. In a web browser + use the URL ``http://localhost:18989``. + + The APEX Application Launcher +------------------------------ + + .. container:: paragraph + + The standard applications (Engine, CLI Editor, REST Editor) + come with dedicated start scripts. For all other APEX + applications, we provide an application launcher. + + .. container:: paragraph + + On UNIX and Cygwin systems use: + + .. container:: ulist + + - apexApps.sh\` - simply starts the application launcher + + .. container:: paragraph + + On Windows systems use: + + .. container:: ulist + + - ``apexApps.bat`` - simply starts the application launcher + + .. container:: paragraph + + Summary of alternatives to start the APEX application + launcher: + + +-------------------------------------------------+---------------------------------------------------+ + | Unix, Cygwin | Windows | + +=================================================+===================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: listingblock | .. container:: listingblock | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: | .. code:: | + | | | + | # $APEX_HOME/bin/apexApps.sh [args] | > %APEX_HOME%\bin\apexApps.bat [args] | + +-------------------------------------------------+---------------------------------------------------+ + + .. container:: paragraph + + The option ``-h`` provides a help screen with all launcher + command line arguments. + + .. container:: listingblock + + .. container:: content + + .. code:: + + apexApps.sh - runs APEX applications + + Usage: apexApps.sh [options] | [<application> [<application options>]] + + Options + -d <app> - describes an application + -l - lists all applications supported by this script + -h - this help screen + + .. container:: paragraph + + Using ``-l`` lists all known application the launcher can + start. + + .. container:: listingblock + + .. container:: content + + .. code:: + + apexApps.sh: supported applications: + --> ws-echo engine eng-monitoring full-client eng-deployment tpl-event-json model-2-cli rest-editor cli-editor ws-console + + .. container:: paragraph + + Using the ``-d <name>`` option describes the named + application, for instance for the ``ws-console``: + + .. container:: listingblock + + .. container:: content + + .. code:: + + apexApps.sh: application 'ws-console' + --> a simple console sending events to APEX, connect to APEX consumer port + + .. container:: paragraph + + Launching an application is done by calling the script with + only the application name and any CLI arguments for the + application. For instance, starting the ``ws-echo`` + application with port ``8888``: + + .. container:: listingblock + + .. container:: content + + .. code:: + + apexApps.sh ws-echo -p 8888 + +Application: Create Event Templates +----------------------------------- + + .. container:: paragraph + + **Status: Experimental** + + .. container:: paragraph + + This application takes a policy model (JSON or XML encoded) + and generates templates for events in JSON format. This can + help when a policy defines rather complex trigger or action + events or complex events between states. The application can + produce events for the types: stimuli (policy trigger + events), internal (events between policy states), and + response (action events). + + +----------------------------------------------------------------+------------------------------------------------------------------+ + | Unix, Cygwin | Windows | + +================================================================+==================================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: listingblock | .. container:: listingblock | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: | .. code:: | + | | | + | # $APEX_HOME/bin/apexApps.sh tpl-event-json [args] | > %APEX_HOME%\bin\apexApps.bat tpl-event-json [args] | + +----------------------------------------------------------------+------------------------------------------------------------------+ + + .. container:: paragraph + + The option ``-h`` provides a help screen. + + .. container:: listingblock + + .. container:: content + + .. code:: + + gen-model2event v{release-version} - generates JSON templates for events generated from a policy model + usage: gen-model2event + -h,--help prints this help and usage screen + -m,--model <MODEL-FILE> set the input policy model file + -t,--type <TYPE> set the event type for generation, one of: + stimuli (trigger events), response (action + events), internal (events between states) + -v,--version prints the application version + + .. container:: paragraph + + The created templates are not valid events, instead they use + some markup for values one will need to change to actual + values. For instance, running the tool with the *Sample + Domain* policy model as: + + .. container:: listingblock + + .. container:: content + + .. code:: + + apexApps.sh tpl-event-json -m $APEX_HOME/examples/models/SampleDomain/SamplePolicyModelJAVA.json -t stimuli + + .. container:: paragraph + + will produce the following status messages: + + .. container:: listingblock + + .. container:: content + + .. code:: + + gen-model2event: starting Event generator + --> model file: examples/models/SampleDomain/SamplePolicyModelJAVA.json + --> type: stimuli + + .. container:: paragraph + + and then run the generator application producing two event + templates. The first template is called ``Event0000``. + + .. container:: listingblock + + .. container:: content + + .. code:: + + { + "name" : "Event0000", + "nameSpace" : "org.onap.policy.apex.sample.events", + "version" : "0.0.1", + "source" : "Outside", + "target" : "Match", + "TestTemperature" : ###double: 0.0###, + "TestTimestamp" : ###long: 0###, + "TestMatchCase" : ###integer: 0###, + "TestSlogan" : "###string###" + } + + .. container:: paragraph + + The values for the keys are marked with ``#`` and the + expected type of the value. To create an actual stimuli + event, all these markers need to be change to actual values, + for instance: + + .. container:: listingblock + + .. container:: content + + .. code:: + + { + "name" : "Event0000", + "nameSpace" : "org.onap.policy.apex.sample.events", + "version" : "0.0.1", + "source" : "Outside", + "target" : "Match", + "TestTemperature" : 25, + "TestTimestamp" : 123456789123456789, + "TestMatchCase" : 1, + "TestSlogan" : "Testing the Match Case with Temperature 25" + } + +Application: Convert a Policy Model to CLI Editor Commands +---------------------------------------------------------- + + .. container:: paragraph + + **Status: Experimental** + + .. container:: paragraph + + This application takes a policy model (JSON or XML encoded) + and generates commands for the APEX CLI Editor. This + effectively reverses a policy specification realized with + the CLI Editor. + + +-------------------------------------------------------------+---------------------------------------------------------------+ + | Unix, Cygwin | Windows | + +=============================================================+===============================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: listingblock | .. container:: listingblock | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: | .. code:: | + | | | + | # $APEX_HOME/bin/apexApps.sh model-2-cli [args] | > %APEX_HOME%\bin\apexApps.bat model-2-cli [args] | + +-------------------------------------------------------------+---------------------------------------------------------------+ + + .. container:: paragraph + + The option ``-h`` provides a help screen. + + .. container:: listingblock + + .. container:: content + + .. code:: + + usage: gen-model2cli + -h,--help prints this help and usage screen + -m,--model <MODEL-FILE> set the input policy model file + -sv,--skip-validation switch of validation of the input file + -v,--version prints the application version + + .. container:: paragraph + + For instance, running the tool with the *Sample Domain* + policy model as: + + .. container:: listingblock + + .. container:: content + + .. code:: + + apexApps.sh model-2-cli -m $APEX_HOME/examples/models/SampleDomain/SamplePolicyModelJAVA.json + + .. container:: paragraph + + will produce the following status messages: + + .. container:: listingblock + + .. container:: content + + .. code:: + + gen-model2cli: starting CLI generator + --> model file: examples/models/SampleDomain/SamplePolicyModelJAVA.json + + .. container:: paragraph + + and then run the generator application producing all CLI + Editor commands and printing them to standard out. + +Application: Websocket Clients (Echo and Console) +------------------------------------------------- + + .. container:: paragraph + + **Status: Production** + + .. container:: paragraph + + The application launcher also provides a Websocket echo + client and a Websocket console client. The echo client + connects to APEX and prints all events it receives from + APEX. The console client connects to APEX, reads input from + the command line, and sends this input as events to APEX. + + +------------------------------------------------------------+--------------------------------------------------------------+ + | Unix, Cygwin | Windows | + +============================================================+==============================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: listingblock | .. container:: listingblock | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: | .. code:: | + | | | + | # $APEX_HOME/bin/apexApps.sh ws-echo [args] | > %APEX_HOME%\bin\apexApps.bat ws-echo [args] | + | # $APEX_HOME/bin/apexApps.sh ws-console [args] | > %APEX_HOME%\bin\apexApps.bat ws-console [args] | + +------------------------------------------------------------+--------------------------------------------------------------+ + + .. container:: paragraph + + The arguments are the same for both applications: + + .. container:: ulist + + - ``-p`` defines the Websocket port to connect to (defaults + to ``8887``) + + - ``-s`` defines the host on which a Websocket server is + running (defaults to ``localhost``) + + .. container:: paragraph + + A discussion on how to use these two applications to build + an APEX system is detailed HowTo-Websockets. + +My First Policy +^^^^^^^^^^^^^^^ + +Introduction +------------ + .. container:: paragraph + + Consider a scenario where a supermarket chain called + *HyperM* controls how it sells items in a policy-based + manner. Each time an item is processed by *HyperM*'s + point-of-sale (PoS) system an event is generated and + published about that item of stock being sold. This event + can then be used to update stock levels, etc.. + + .. container:: paragraph + + *HyperM* want to extend this approach to allow some checks + to be performed before the sale can be completed. This can + be achieved by requesting a policy-controlled decision as + each item is processed by for sale by each PoS system. The + decision process is integrated with *HyperM*'s other IT + systems that manage stock control, sourcing and purchasing, + personnel systems, etc. + + .. container:: paragraph + + In this document we will show how APEX and APEX Policies can + be used to achieve this, starting with a simple policy, + building up to more complicated policy that demonstrates the + features of APEX. + +Data Models +----------- + +Sales Input Event +################# + + .. container:: paragraph + + Each time a PoS system processes a sales item an event + with the following format is emitted: + + .. table:: Table 1. Sale Input Event + + +----------------------+----------------------+-----------------------+ + | Event | Fields | Description | + +======================+======================+=======================+ + | SALE_INPUT | time, sale_ID, | Event indicating a | + | | amount, item_ID, | sale of an item is | + | | quantity, | occurring | + | | assistant_ID, | | + | | branch_ID, notes, … | | + +----------------------+----------------------+-----------------------+ + + .. container:: paragraph + + In each ``SALE_INPUT`` event the ``sale_ID`` field is a + unique ID generated by the PoS system. A timestamp for + the event is stored in the ``time`` field. The ``amount`` + field refers to the value of the item(s) to be sold (in + cents). The ``item_ID`` field is a unique identifier for + each item type, and can be used to retrieve more + information about the item from *HyperM*'s stock control + system. The ``quantity`` field refers to the quantity of + the item to be sold. The ``assistant_ID`` field is a + unique identifier for the PoS operator, and can be used + to retrieve more information about the operator from the + *HyperM*'s personnel system. Since *HyperM* has many + branches the ``branch_ID`` identifies the shop. The + ``notes`` field contains arbitrary notes about the sale. + +Sales Decision Event +#################### + + .. container:: paragraph + + After a ``SALE_INPUT`` event is emitted by the PoS system + *HyperM*'s policy-based controlled sales checking system + emits a Sale Authorization Event indicating whether the + sale is authorized or denied. The PoS system can then + listen for this event before continuing with the sale. + + .. table:: Table 2. Sale Authorisation Event + + +----------------------+----------------------+-----------------------+ + | Event | Fields | Description | + +======================+======================+=======================+ + | SALE_AUTH | sale_ID, time, | Event indicating a | + | | authorized, amount, | sale of an item is | + | | item_ID, quantity, | authorized or denied | + | | assistant_ID, | | + | | branch_ID, notes, | | + | | message… | | + +----------------------+----------------------+-----------------------+ + + .. container:: paragraph + + In each ``SALE_AUTH`` event the ``sale_ID`` field is + copied from the ``SALE_INPUT`` event that trigger the + decision request. The ``SALE_AUTH`` event is also + timestamped using the ``time`` field, and a field called + ``authorised`` is set to ``true`` or ``false`` depending + on whether the sale is authorized or denied. The + ``message`` field carries an optional message about why a + sale was not authorized. The other fields from the + ``SALE_INPUT`` event are also included for completeness. + +Stock Control: Items +#################### + + .. container:: paragraph + + *HyperM* maintains information about each item for sale + in a database table called ``ITEMS``. + + .. table:: Table 3. Items Database + + +----------------------+----------------------+-----------------------+ + | Table | Fields | Description | + +======================+======================+=======================+ + | ITEMS | item_ID, | Database table | + | | description, | describing each item | + | | cost_price, barcode, | for sale | + | | supplier_ID, | | + | | category, … | | + +----------------------+----------------------+-----------------------+ + + .. container:: paragraph + + The database table ``ITEMS`` has a row for each items + that *HyperM* sells. Each item is identified by an + ``item_ID`` value. The ``description`` field stores a + description of the item. The cost price of the item is + given in ``cost_price``. The barcode of the item is + encoded in ``barcode``, while the item supplier is + identified by ``supplier_ID``. Items may also be + classified into categories using the ``category`` field. + Useful categories might include: ``soft drinks``, + ``alcoholic drinks``, ``cigarettes``, ``knives``, + ``confectionery``, ``bakery``, ``fruit&vegetables``, + ``meat``, etc.. + +Personnel System: Assistants +############################ + + .. table:: Table 4. Assistants Database + + +----------------------+----------------------+-----------------------+ + | Table | Fields | Description | + +======================+======================+=======================+ + | ASSISTANTS | assistant_ID, | Database table | + | | surname, firstname, | describing each | + | | middlename, age, | *HyperM* sales | + | | grade, phone_number, | assistant | + | | … | | + +----------------------+----------------------+-----------------------+ + + .. container:: paragraph + + The database table ``ASSISTANTS`` has a row for each + sales assistant employed by *HyperM*. Each assistant is + identified by an ``assistant_ID`` value, with their name + given in the ``firstname``, ``middlename`` and + ``surname`` fields. The assistant’s age in years is given + in ``age``, while their phone number is contained in the + ``phone_number`` field. The assistant’s grade is encoded + in ``grade``. Useful values for ``grade`` might include: + ``trainee``, ``operator``, ``supervisor``, etc.. + +Locations: Branches +#################### + + .. table:: Table 5. Branches Database + + +----------------------+----------------------+-----------------------+ + | Table | Fields | Description | + +======================+======================+=======================+ + | BRANCHES | branch_ID, | Database table | + | | branch_Name, | describing each | + | | category, street, | *HyperM* branch | + | | city, country, | | + | | postcode, … | | + +----------------------+----------------------+-----------------------+ + + .. container:: paragraph + + *HyperM* operates a number of branches. Each branch is + described in the ``BRANCHES`` database table. Each branch + is identified by a ``branch_ID``, with a branch name + given in ``branch_Name``. The address for the branch is + encoded in ``street``, ``city``, ``country`` and + ``postcode``. The branch category is given in the + ``category`` field. Useful values for ``category`` might + include: ``Small``, ``Large``, ``Super``, ``Hyper``, + etc.. + +Policy Step 1 +------------- + +Scenario +######### + .. container:: paragraph + + For the first version of our policy, let’s start with + something simple. Let us assume that there exists some + restriction that alcohol products cannot be sold before + 11:30am. In this section we will go through the necessary + steps to define a policy that can enforce this for + *HyperM*. + + .. container:: ulist + + - Alcohol cannot be sold before 11:30am. + +Create the an new empty Policy Model ``MyFirstPolicyModel`` +########################################################### + + .. container:: paragraph + + Since an organisation like *HyperM* may have many + policies covering many different domains, policies should + be grouped into policy sets. In order to edit or deploy a + policy, or policy set, the definition of the policy(ies) + and all required events, tasks, states, etc., are grouped + together into a 'Policy Model'. An organization might + define many Policy Models, each containing a different + set of policies. + + .. container:: paragraph + + So the first step is to create a new empty Policy Model + called ``MyFirstPolicyModel``. Using the APEX Policy + Editor, click on the 'File' menus and select 'New'. Then + define our new policy model called + ``MyFirstPolicyModel``. Use the 'Generate UUID' button to + create a new unique ID for the policy model, and fill in + a description for the policy model. Press the ``Submit`` + button to save your changes. + + .. container:: imageblock + + .. container:: content + + |File > New to create a new Policy Model| + + .. container:: title + + Figure 4. Create a new Policy Model 1/2 + + .. container:: imageblock + + .. container:: content + + |Create a new Policy Model| + + .. container:: title + + Figure 5. Create a new Policy Model 2/2 + +Create the input event ``SALE_INPUT`` and the output event ``SALE_AUTH`` +######################################################################## + + .. container:: paragraph + + Using the APEX Policy Editor, click on the 'Events' tab. + In the 'Events' pane, right click and select 'New': + + .. container:: imageblock + + .. container:: content + + |Right click to create a new event| + + .. container:: title + + Figure 6. Create a new Event type + + .. container:: paragraph + + Create a new event type called ``SALE_INPUT``. Use the + 'Generate UUID' button to create a new unique ID for the + event type, and fill in a description for the event. Add + a namespace, e.g. ``com.hyperm``. We can add hard-coded + strings for the ``Source`` and ``Target``, e.g. ``POS`` + and ``APEX``. At this stage we will not add any parameter + fields, we will leave this until later. Use the + ``Submit`` button to create the event. + + .. container:: imageblock + + .. container:: content + + |Fill in the necessary information for the + 'SALE_INPUT' event and click 'Submit'| + + .. container:: title + + Figure 7. Populate the ``SALE_INPUT`` event + + .. container:: paragraph + + Repeat the same steps for a new event type called + ``SALE_AUTH``. Just use ``APEX`` as source and ``POS`` as + target, since this is the output event coming from APEX + going to the sales point. + + .. container:: paragraph + + Before we can add parameter fields to an event we must + first define APEX Context Item Schemas that can be used + by those fields. + + .. container:: paragraph + + To create new item schemas, click on the 'Context Item + Schemas' tab. In that 'Context Item Schemas' pane, right + click and select 'Create new ContextSchema'. + + .. container:: imageblock + + .. container:: content + + |Right click to create a new Item Schema| + + .. container:: title + + Figure 8. Create new Data Types + + .. container:: paragraph + + Create item schemas with the following characteristics, + each with its own unique UUID: + + .. table:: Table 6. Item Schemas + + +-------------------+-----------------+-----------------+----------------------+ + | Name | Schema Flavour | Schema | Description | + | | | Definition | | + +===================+=================+=================+======================+ + | timestamp_type | Java | java.lang.Long | A type for | + | | | | ``time`` values | + +-------------------+-----------------+-----------------+----------------------+ + | sale_ID_type | Java | java.lang.Long | A type for | + | | | | ``sale_ID`` | + | | | | values | + +-------------------+-----------------+-----------------+----------------------+ + | price_type | Java | java.lang.Long | A type for | + | | | | ``amount``/``price`` | + | | | | values | + +-------------------+-----------------+-----------------+----------------------+ + | item_ID_type | Java | java.lang.Long | A type for | + | | | | ``item_ID`` | + | | | | values | + +-------------------+-----------------+-----------------+----------------------+ + | assistant_ID_type | Java | java.lang.Long | A type for | + | | | | ``assistant_ID`` | + | | | | values | + +-------------------+-----------------+-----------------+----------------------+ + | quantity_type | Java | java.lang.Integ | A type for | + | | | er | ``quantity`` | + | | | | values | + +-------------------+-----------------+-----------------+----------------------+ + | branch_ID_type | Java | java.lang.Long | A type for | + | | | | ``branch_ID`` | + | | | | values | + +-------------------+-----------------+-----------------+----------------------+ + | notes_type | Java | java.lang.Strin | A type for | + | | | g | ``notes`` | + | | | | values | + +-------------------+-----------------+-----------------+----------------------+ + | authorised_type | Java | java.lang.Boole | A type for | + | | | an | ``authorised`` | + | | | | values | + +-------------------+-----------------+-----------------+----------------------+ + | message_type | Java | java.lang.Strin | A type for | + | | | g | ``message`` | + | | | | values | + +-------------------+-----------------+-----------------+----------------------+ + + .. container:: imageblock + + .. container:: content + + |Create a new Item Schema| + + .. container:: title + + Figure 9. Create new Item Schemas + + .. container:: paragraph + + The item schemas can now be seen on the 'Context Item + Schemas' tab, and can be updated at any time by + right-clicking on the item schemas on the 'Context Item + Schemas' tab. Now we can go back to the event definitions + for ``SALE_INPUT`` and ``SALE_AUTH`` and add some + parameter fields. + + .. tip + + .. container:: title + + Field Schema types + + .. container:: paragraph + + APEX natively supports schema definitions in ``Java`` and ``Avro``. + + .. container:: paragraph + + ``Java`` schema definitions are simply the name of a Java Class. There are some restrictions: + + .. container:: ulist + + - the class must be instantiatable, i.e. not an Java interface or abstract class + + - primitive types are not supported, i.e. use ``java.lang.Integer`` instead of ``int``, etc. + + - it must be possible to find the class, i.e. the class must be contained in the Java classpath. + + .. container:: paragraph + + ``Avro`` schema definitions can be any valid `Avro <https://avro.apache.org/docs/current/spec.html>`__ + schema. For events using fields defined with ``Avro`` schemas, any incoming event containing that field must + contain a value that conforms to the Avro schema. + + .. container:: paragraph + + Click on the 'Events' tab, then right click the + ``SALE_INPUT`` row and select 'Edit Event + :literal:`SALE_INPUT’. To add a new event parameter use the 'Add Event Parameter' button at the bottom of the screen. For the `SALE_INPUT` + event add the following event parameters: + + .. table:: Table 7. Event Parameter Fields for the ``SALE_INPUT`` Event + + +----------------------+----------------------+-----------------------+ + | Parameter Name | Parameter Type | Optional | + +======================+======================+=======================+ + | time | timestamp_type | no | + +----------------------+----------------------+-----------------------+ + | sale_ID | sale_ID_type | no | + +----------------------+----------------------+-----------------------+ + | amount | price_type | no | + +----------------------+----------------------+-----------------------+ + | item_ID | item_ID_type | no | + +----------------------+----------------------+-----------------------+ + | quantity | quantity_type | no | + +----------------------+----------------------+-----------------------+ + | assistant_ID | assistant_ID_type | no | + +----------------------+----------------------+-----------------------+ + | branch_ID | branch_ID_type | no | + +----------------------+----------------------+-----------------------+ + | notes | notes_type | *yes* | + +----------------------+----------------------+-----------------------+ + + .. container:: paragraph + + Remember to click the 'Submit' button at the bottom of + the event definition pane. + + .. tip:: + Optional Fields in APEX Events + Parameter fields can be *optional* in events. If a parameter is not marked as *optional* then by default it + is *mandatory*, so it must appear in any input event passed to APEX. If an *optional* field is not set + for an output event then value will be set to ``null``. + + .. container:: imageblock + + .. container:: content + + |Add new event parameters to an event| + + .. container:: title + + Figure 10. Add typed parameter fields to an event + + .. container:: paragraph + + Select the ``SALE_AUTH`` event and add the following + event parameters: + + .. table:: Table 8. Event Parameter Fields for the ``SALE_AUTH`` Event + + +----------------------+----------------------+-----------------------+ + | Parameter Name | Parameter Type | no | + +======================+======================+=======================+ + | sale_ID | sale_ID_type | no | + +----------------------+----------------------+-----------------------+ + | time | timestamp_type | no | + +----------------------+----------------------+-----------------------+ + | authorised | authorised_type | no | + +----------------------+----------------------+-----------------------+ + | message | message_type | *yes* | + +----------------------+----------------------+-----------------------+ + | amount | price_type | no | + +----------------------+----------------------+-----------------------+ + | item_ID | item_ID_type | no | + +----------------------+----------------------+-----------------------+ + | assistant_ID | assistant_ID_type | no | + +----------------------+----------------------+-----------------------+ + | quantity | quantity_type | no | + +----------------------+----------------------+-----------------------+ + | branch_ID | branch_ID_type | no | + +----------------------+----------------------+-----------------------+ + | notes | notes_type | *yes* | + +----------------------+----------------------+-----------------------+ + + .. container:: paragraph + + Remember to click the 'Submit' button at the bottom of + the event definition pane. + + .. container:: paragraph + + The events for our policy are now defined. + +Create a new Policy and add the *"No Booze before 11:30"* check +############################################################### + + .. container:: paragraph + + APEX policies are defined using a state-machine model. + Each policy comprises one or more *states* that can be + individually executed. Where there is more than one + *state* the states are chained together to form a + `Directed Acyclic Graph + (DAG) <https://en.wikipedia.org/wiki/Directed_acyclic_graph>`__ + of states. A *state* is triggered by passing it a single + input (or 'trigger') event and once executed each state + then emits an output event. For each *state* the logic + for the *state* is embedded in one or more *tasks*. Each + *task* contains specific *task logic* that is executed by + the APEX execution environment each time the *task* is + invoked. Where there is more than one *task* in a *state* + then the *state* also defines some *task selection logic* + to select an appropriate task each time the *state* is + executed. + + .. container:: paragraph + + Therefore, to create a new policy we must first define + one or more tasks. + + .. container:: paragraph + + To create a new Task click on the 'Tasks' tab. In the + 'Tasks' pane, right click and select 'Create new Task'. + Create a new Task called ``MorningBoozeCheck``. Use the + 'Generate UUID' button to create a new unique ID for the + task, and fill in a description for the task. + + .. container:: imageblock + + .. container:: content + + |Right click to create a new task| + + .. container:: title + + Figure 11. Create a new Task + + .. container:: paragraph + + Tasks are configured with a set of *input fields* and a + set of *output fields*. To add new input/output fields + for a task use the 'Add Task Input Field' and 'Add Task + Output Field' button. The list of input and out fields to + add for the ``MorningBoozeCheck`` task are given below. + The input fields are drawn from the parameters in the + state’s input event, and the task’s output fields are + used to populate the state’s output event. The task’s + input and output fields must be a subset of the event + parameters defined for the input and output events for + any state that uses that task. (You may have noticed that + the input and output fields for the ``MorningBoozeCheck`` + task have the exact same names and reuse the item schemas + that we used for the parameters in the ``SALE_INPUT`` and + ``SALE_AUTH`` events respectively). + + .. table:: Table 9. Input fields for ``MorningBoozeCheck`` task + + +-----------------------------------+-----------------------------------+ + | Parameter Name | Parameter Type | + +===================================+===================================+ + | time | timestamp_type | + +-----------------------------------+-----------------------------------+ + | sale_ID | sale_ID_type | + +-----------------------------------+-----------------------------------+ + | amount | price_type | + +-----------------------------------+-----------------------------------+ + | item_ID | item_ID_type | + +-----------------------------------+-----------------------------------+ + | quantity | quantity_type | + +-----------------------------------+-----------------------------------+ + | assistant_ID | assistant_ID_type | + +-----------------------------------+-----------------------------------+ + | branch_ID | branch_ID_type | + +-----------------------------------+-----------------------------------+ + | notes | notes_type | + +-----------------------------------+-----------------------------------+ + + .. table:: Table 10. Output fields for ``MorningBoozeCheck`` task + + +-----------------------------------+-----------------------------------+ + | Parameter Name | Parameter Type | + +===================================+===================================+ + | sale_ID | sale_ID_type | + +-----------------------------------+-----------------------------------+ + | time | timestamp_type | + +-----------------------------------+-----------------------------------+ + | authorised | authorised_type | + +-----------------------------------+-----------------------------------+ + | message | message_type | + +-----------------------------------+-----------------------------------+ + | amount | price_type | + +-----------------------------------+-----------------------------------+ + | item_ID | item_ID_type | + +-----------------------------------+-----------------------------------+ + | assistant_ID | assistant_ID_type | + +-----------------------------------+-----------------------------------+ + | quantity | quantity_type | + +-----------------------------------+-----------------------------------+ + | branch_ID | branch_ID_type | + +-----------------------------------+-----------------------------------+ + | notes | notes_type | + +-----------------------------------+-----------------------------------+ + + .. container:: imageblock + + .. container:: content + + |Add input and out fields for the task| + + .. container:: title + + Figure 12. Add input and out fields for the Task + + .. container:: paragraph + + Each task must include some 'Task Logic' that implements + the behaviour for the task. Task logic can be defined in + a number of different ways using a choice of languages. + For this task we will author the logic using the + Java-like scripting language called + ```MVEL`` <https://en.wikipedia.org/wiki/MVEL>`__. + + .. container:: paragraph + + For simplicity use the following code for the task logic. + Paste the script text into the 'Task Logic' box, and use + "MVEL" as the 'Task Logic Type / Flavour'. + + .. container:: paragraph + + This logic assumes that all items with ``item_ID`` + between 1000 and 2000 contain alcohol, which is not very + realistic, but we will see a better approach for this + later. It also uses the standard ``Java`` time utilities + to check if the current time is between ``00:00:00 GMT`` + and ``11:30:00 GMT``. For a detailed guide to how to + write your own logic in + ```JavaScript`` <https://en.wikipedia.org/wiki/JavaScript>`__, + ```MVEL`` <https://en.wikipedia.org/wiki/MVEL>`__ or one + of the other supported languages please refer to APEX + Programmers Guide. + + .. container:: listingblock + + .. container:: title + + MVEL code for the ``MorningBoozeCheck`` task + + .. container:: content + + .. code:: + + /* + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + import java.util.Date; + import java.util.Calendar; + import java.util.TimeZone; + import java.text.SimpleDateFormat; + + logger.info("Task Execution: '"+subject.id+"'. Input Fields: '"+inFields+"'"); + + outFields.put("amount" , inFields.get("amount")); + outFields.put("assistant_ID", inFields.get("assistant_ID")); + outFields.put("notes" , inFields.get("notes")); + outFields.put("quantity" , inFields.get("quantity")); + outFields.put("branch_ID" , inFields.get("branch_ID")); + outFields.put("item_ID" , inFields.get("item_ID")); + outFields.put("time" , inFields.get("time")); + outFields.put("sale_ID" , inFields.get("sale_ID")); + + item_id = inFields.get("item_ID"); + + //The events used later to test this task use GMT timezone! + gmt = TimeZone.getTimeZone("GMT"); + timenow = Calendar.getInstance(gmt); + df = new SimpleDateFormat("HH:mm:ss z"); + df.setTimeZone(gmt); + timenow.setTimeInMillis(inFields.get("time")); + + midnight = timenow.clone(); + midnight.set( + timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH), + timenow.get(Calendar.DATE),0,0,0); + eleven30 = timenow.clone(); + eleven30.set( + timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH), + timenow.get(Calendar.DATE),11,30,0); + + itemisalcohol = false; + if(item_id != null && item_id >=1000 && item_id < 2000) + itemisalcohol = true; + + if( itemisalcohol + && timenow.after(midnight) && timenow.before(eleven30)){ + outFields.put("authorised", false); + outFields.put("message", "Sale not authorised by policy task "+subject.taskName+ + " for time "+df.format(timenow.getTime())+ + ". Alcohol can not be sold between "+df.format(midnight.getTime())+ + " and "+df.format(eleven30.getTime())); + return true; + } + else{ + outFields.put("authorised", true); + outFields.put("message", "Sale authorised by policy task "+subject.taskName+ + " for time "+df.format(timenow.getTime())); + return true; + } + + /* + This task checks if a sale request is for an item that is an alcoholic drink. + If the local time is between 00:00:00 GMT and 11:30:00 GMT then the sale is not + authorised. Otherwise the sale is authorised. + In this implementation we assume that items with item_ID value between 1000 and + 2000 are all alcoholic drinks :-) + */ + + .. container:: imageblock + + .. container:: content + + |Add task logic the task| + + .. container:: title + + Figure 13. Add Task Logic the Task + + .. container:: paragraph + + An alternative version of the same logic is available in + JavaScript. Just use "JAVASCRIPT" as the 'Task Logic Type + / Flavour' instead. + + .. container:: listingblock + + .. container:: title + + Javascript alternative for the ``MorningBoozeCheck`` + task + + .. container:: content + + .. code:: + + /* + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + + var returnValueType = Java.type("java.lang.Boolean"); + var returnValue = new returnValueType(true); + + // Load compatibility script for imports etc + load("nashorn:mozilla_compat.js"); + importPackage(java.text); + importClass(java.text.SimpleDateFormat); + + executor.logger.info("Task Execution: '"+executor.subject.id+"'. Input Fields: '"+executor.inFields+"'"); + + executor.outFields.put("amount" , executor.inFields.get("amount")); + executor.outFields.put("assistant_ID", executor.inFields.get("assistant_ID")); + executor.outFields.put("notes" , executor.inFields.get("notes")); + executor.outFields.put("quantity" , executor.inFields.get("quantity")); + executor.outFields.put("branch_ID" , executor.inFields.get("branch_ID")); + executor.outFields.put("item_ID" , executor.inFields.get("item_ID")); + executor.outFields.put("time" , executor.inFields.get("time")); + executor.outFields.put("sale_ID" , executor.inFields.get("sale_ID")); + + item_id = executor.inFields.get("item_ID"); + + //All times in this script are in GMT/UTC since the policy and events assume time is in GMT. + var timenow_gmt = new Date(Number(executor.inFields.get("time"))); + + var midnight_gmt = new Date(Number(executor.inFields.get("time"))); + midnight_gmt.setUTCHours(0,0,0,0); + + var eleven30_gmt = new Date(Number(executor.inFields.get("time"))); + eleven30_gmt.setUTCHours(11,30,0,0); + + var timeformatter = new java.text.SimpleDateFormat("HH:mm:ss z"); + + var itemisalcohol = false; + if(item_id != null && item_id >=1000 && item_id < 2000) + itemisalcohol = true; + + if( itemisalcohol + && timenow_gmt.getTime() >= midnight_gmt.getTime() + && timenow_gmt.getTime() < eleven30_gmt.getTime()) { + + executor.outFields.put("authorised", false); + executor.outFields.put("message", "Sale not authorised by policy task " + + executor.subject.taskName+ " for time " + timeformatter.format(timenow_gmt.getTime()) + + ". Alcohol can not be sold between " + timeformatter.format(midnight_gmt.getTime()) + + " and " + timeformatter.format(eleven30_gmt.getTime())); + } + else{ + executor.outFields.put("authorised", true); + executor.outFields.put("message", "Sale authorised by policy task " + + executor.subject.taskName + " for time "+timeformatter.format(timenow_gmt.getTime())); + } + + /* + This task checks if a sale request is for an item that is an alcoholic drink. + If the local time is between 00:00:00 GMT and 11:30:00 GMT then the sale is not + authorised. Otherwise the sale is authorised. + In this implementation we assume that items with item_ID value between 1000 and + 2000 are all alcoholic drinks :-) + */ + + .. container:: paragraph + + The task definition is now complete so click the 'Submit' + button to save the task. The task can now be seen on the + 'Tasks' tab, and can be updated at any time by + right-clicking on the task on the 'Task' tab. Now that we + have created our task, we can can create a policy that + uses that task. + + .. container:: paragraph + + To create a new Policy click on the 'Policies' tab. In + the 'Policies' pane, right click and select 'Create new + Policy': + + .. container:: paragraph + + Create a new Policy called ``MyFirstPolicy``. Use the + 'Generate UUID' button to create a new unique ID for the + policy, and fill in a description for the policy. Use + 'FREEFORM' as the 'Policy Flavour'. + + .. container:: paragraph + + Each policy must have at least one state. Since this is + 'freeform' policy we can add as many states as we wish. + Let’s start with one state. Add a new state called + ``BoozeAuthDecide`` to this ``MyFirstPolicy`` policy + using the 'Add new State' button after filling in the + name of our new state. + + .. container:: imageblock + + .. container:: content + + |Create a new policy| + + .. container:: title + + Figure 14. Create a new Policy + + .. container:: paragraph + + Each state must uses one input event type. For this new + state select the ``SALE_INPUT`` event as the input event. + + .. container:: paragraph + + Each policy must define a 'First State' and a 'Policy + Trigger Event'. The 'Policy Trigger Event' is the input + event for the policy as a whole. This event is then + passed to the first state in the chain of states in the + policy, therefore the 'Policy Trigger Event' will be the + input event for the first state. Each policy can only + have one 'First State'. For our ``MyFirstPolicy`` policy, + select ``BoozeAuthDecide`` as the 'First State'. This + will automatically select ``SALE_INPUT`` as the 'Policy + Trigger Event' for our policy. + + .. container:: imageblock + + .. container:: content + + |Create a state| + + .. container:: title + + Figure 15. Create a new State + + .. container:: paragraph + + In this case we will create a reference the pre-existing + ``MorningBoozeCheck`` task that we defined above using + the 'Add New Task' button. Select the + ``MorningBoozeCheck`` task, and use the name of the task + as the 'Local Name' for the task. + + .. container:: paragraph + + in the case where a state references more than one task, + a 'Default Task' must be selected for the state and some + logic ('Task Selection Logic') must be specified to + select the appropriate task at execution time. Since our + new state ``BoozeAuthDecide`` only has one task the + default task is automatically selected and no 'Task + Selection Logic' is required. + + .. note:: + .. container:: title + + State Output Mappings + + .. container:: paragraph + + In a 'Policy' 'State' a 'State Output Mapping' has 3 roles: + 1) Select which 'State' should be executed next, 2) Select + the type of the state’s 'Outgoing Event', and 3) + Populate the state’s 'Outgoing Event'. This is how states are + chained together to form a (`Directed Acyclic Graph + (DAG) <https://en.wikipedia.org/wiki/Directed_acyclic_graph>`__ ) + of states. The final state(s) of a policy are those that do + not select any 'next' state. Since a 'State' can only + accept a single type of event, the type of the event emitted + by a previous 'State' must be match the incoming event type + of the next 'State'. This is also how the last state(s) in + a policy can emit events of different types. The 'State + Output Mapping' is also responsible for taking the + fields that are output by the task executed in the state and + populating the state’s output event before it is emitted. + + .. container:: paragraph + + Each 'Task' referenced in 'State' must have a defined + 'Output Mapping' to take the output of the task, select an + 'Outgoing Event' type for the state, populate the state’s + outgoing event, and then select the next state to be + executed (if any). + + .. container:: paragraph + + There are 2 basic types of output mappings: + + .. container:: olist arabic + + #. **Direct Output Mappings** have a single value for + 'Next State' and a single value for 'State Output + Event'. The outgoing event for the state is + automatically created, any outgoing event parameters + that were present in the incoming event are copied + into the outgoing event, then any task output fields + that have the same name and type as parameters in the + outgoing event are automatically copied into + the outgoing event. + + #. **Logic-based State Output Mappings / Finalizers** + have some logic defined that dynamically selects + and creates the 'State Outgoing Event', manages + the population of the outgoing event parameters + (perhaps changing or adding to the outputs from the + task), and then dynamically selects the next state to + be executed (if any). + + .. container:: paragraph + + Each task reference must also have an associated 'Output + State Mapping' so we need an 'Output State Mapping' for + the ``BoozeAuthDecide`` state to use when the + ``MorningBoozeCheck`` task is executed. The simplest type + of output mapping is a 'Direct Output Mapping'. + + .. container:: paragraph + + Create a new 'Direct Output Mapping' for the state called + ``MorningBoozeCheck_Output_Direct`` using the 'Add New + Direct State Output Mapping' button. Select ``SALE_AUTH`` + as the output event and select ``None`` for the next + state value. We can then select this output mapping for + use when the the ``MorningBoozeCheck`` task is executed. + Since there is only state, and only one task for that + state, this output mapping ensures that the + ``BoozeAuthDecide`` state is the only state executed and + the state (and the policy) can only emit events of type + ``SALE_AUTH``. (You may remember that the output fields + for the ``MorningBoozeCheck`` task have the exact same + names and reuse the item schemas that we used for the + parameters in ``SALE_AUTH`` event. The + ``MorningBoozeCheck_Output_Direct`` direct output mapping + can now automatically copy the values from the + ``MorningBoozeCheck`` task directly into outgoing + ``SALE_AUTH`` events.) + + .. container:: imageblock + + .. container:: content + + |Add a Task and Output Mapping| + + .. container:: title + + Figure 16. Add a Task and Output Mapping + + .. container:: paragraph + + Click the 'Submit' button to complete the definition of + our ``MyFirstPolicy`` policy. The policy + ``MyFirstPolicy`` can now be seen in the list of policies + on the 'Policies' tab, and can be updated at any time by + right-clicking on the policy on the 'Policies' tab. + + .. container:: paragraph + + The ``MyFirstPolicyModel``, including our + ``MyFirstPolicy`` policy can now be checked for errors. + Click on the 'Model' menu and select 'Validate'. The + model should validate without any 'Warning' or 'Error' + messages. If you see any 'Error' or 'Warning' messages, + carefully read the message as a hint to find where you + might have made a mistake when defining some aspect of + your policy model. + + .. container:: imageblock + + .. container:: content + + |Validate the policy model for error using the 'Model' + > 'Validate' menu item| + + .. container:: title + + Figure 17. Validate a Policy Model + + .. container:: paragraph + + Congratulations, you have now completed your first APEX + policy. The policy model containing our new policy can + now be exported from the editor and saved. Click on the + 'File' menu and select 'Download' to save the policy + model in JSON format. The exported policy model is then + available in the directory you selected, for instance + ``$APEX_HOME/examples/models/MyFirstPolicy/1/MyFirstPolicyModel_0.0.1.json``. + The exported policy can now be loaded into the APEX + Policy Engine, or can be re-loaded and edited by the APEX + Policy Editor. + + .. container:: imageblock + + .. container:: content + + |Download the completed policy model using the 'File' + > 'Download' menu item| + + .. container:: title + + Figure 18. Export a Policy Model + +Test Policy Step 1 +################## + + .. container:: paragraph + + To start a new APEX Engine you can use the following + configuration. In a full APEX installation you can find + this configuration in + ``$APEX_HOME/examples/config/MyFirstPolicy/1/MyFirstPolicyConfigStdin2StdoutJsonEvent.json``. + This configuration expects incoming events to be in + ``JSON`` format and to be passed into the APEX Engine + from ``stdin``, and result events will be printed in + ``JSON`` format to ``stdout``. This configuration loads + the policy model stored in the file + 'MyFirstPolicyModel_0.0.1.json' as exported from the APEX + Editor. Note, you may need to edit this file to provide + the full path to wherever you stored the exported policy + model file. + + .. container:: listingblock + + .. container:: title + + JSON to load and execute *My First Policy*, read input + JSON events from ``stdin``, and emit output events to + ``stdout`` + + .. container:: content + + .. code:: + + { + "engineServiceParameters" : { + "name" : "MyFirstPolicyApexEngine", + "version" : "0.0.1", + "id" : 101, + "instanceCount" : 4, + "deploymentPort" : 12345, + "policyModelFileName" : "examples/models/MyFirstPolicy/1/MyFirstPolicyModel_0.0.1.json", + "engineParameters" : { + "executorParameters" : { + "MVEL" : { + "parameterClassName" : "org.onap.policy.apex.plugins.executor.mvel.MVELExecutorParameters" + }, + "JAVASCRIPT" : { + "parameterClassName" : "org.onap.policy.apex.plugins.executor.javascript.JavascriptExecutorParameters" + } + } + } + }, + "eventOutputParameters": { + "FirstProducer": { + "carrierTechnologyParameters" : { + "carrierTechnology" : "FILE", + "parameters" : { + "standardIO" : true + } + }, + "eventProtocolParameters" : { + "eventProtocol" : "JSON" + } + } + }, + "eventInputParameters": { + "FirstConsumer": { + "carrierTechnologyParameters" : { + "carrierTechnology" : "FILE", + "parameters" : { + "standardIO" : true + } + }, + "eventProtocolParameters" : { + "eventProtocol" : "JSON" + } + } + } + } + + .. container:: paragraph + + To test the policy try paste the following events into + the console as the APEX engine executes: + + .. table:: Table 11. Inputs and Outputs when testing *My First Policy* + + +------------------------------------------+-------------------------------------------+-----------+ + | Input Event (JSON) | Output Event (JSON) | comment | + +==========================================+===========================================+===========+ + | .. container:: | .. container:: | Request | + | | | to buy a | + | .. container:: listingblock | .. container:: listingblock | non-alcoh | + | | | olic | + | | .. container:: content | item | + | .. container:: content | | (``item_I | + | | .. code:: | D=5123``) | + | | | at | + | .. code:: | { | *10:13:09 | + | | "name": "SALE_AUTH", | * | + | | | on | + | { | "version": "0.0.1", | *Tuesday, | + | "nameSpace": "com.hyperm", | "nameSpace": "com.hyperm", | 10 | + | "name" : "SALE_INPUT", | "source": "", | January | + | "version": "0.0.1", | "target": "", | 2017*. | + | "time" : 1483351989000, | "amount": 299, | Sale is | + | "sale_ID": 99999991, | "assistant_ID": 23, | authorize | + | "amount": 299, | "authorised": true, | d. | + | "item_ID": 5123, | "branch_ID": 1, | | + | "quantity": 1, | "item_ID": 5123, | | + | "assistant_ID": 23, | "message": "Sale authorised | | + | "branch_ID": 1, | by policy task MorningBo | | + | "notes": "Special Offer!!" | ozeCheck for time 10:13:09 | | + | } | GMT", | | + | | "notes": "Special Offer!!", | | + | | "quantity": 1, | | + | | "sale_ID": 99999991, | | + | | "time": 1483351989000 | | + | | } | | + | | | | + | | | | + | | | | + +------------------------------------------+-------------------------------------------+-----------+ + | .. container:: | .. container:: | Request | + | | | to buy | + | .. container:: listingblock | .. container:: listingblock | alcohol | + | | | item | + | .. container:: content | .. container:: content | (``item_I | + | | | D=1249``) | + | .. code:: | .. code:: | at | + | | | *08:41:06 | + | { | { | * | + | "nameSpace": "com.hyperm", | "nameSpace": "com.hyperm", | on | + | "name": "SALE_INPUT", | "name": "SALE_AUTH", | *Monday, | + | "version": "0.0.1", | "source": "", | 02 | + | "time": 1483346466000, | "target": "", | January | + | "sale_ID": 99999992, | "amount": 1249, | 2017*. | + | "version": "0.0.1", | "assistant_ID": 12, | | + | "amount": 1249, | "authorised": false, | Sale is | + | "item_ID": 1012, | "branch_ID": 2, | not | + | "quantity": 1, | "item_ID": 1012, | authorize | + | "assistant_ID": 12, | "message": "Sale not | d. | + | "branch_ID": 2 | authorised by policy task | | + | } | MorningBoozeCheck for time | | + | | 08:41:06 GMT. Alcohol can | | + | | not be sold between | | + | | 00:00:00 GMT and 11:30:00 | | + | | GMT", | | + | | "notes": null, | | + | | "quantity": 1, | | + | | "sale_ID": 99999992, | | + | | "time": 1483346466000 | | + | | } | | + +------------------------------------------+-------------------------------------------+-----------+ + | .. container:: | .. container:: | Request | + | | | to buy | + | .. container:: listingblock | .. container:: listingblock | alcohol | + | | | (``item_I | + | | .. container:: content | D=1943``) | + | .. container:: content | | at | + | | .. code:: | *20:17:13 | + | | | * | + | .. code:: | { | on | + | | "name": "SALE_AUTH", | *Tuesday, | + | { | "version": "0.0.1", | 20 | + | "nameSpace": "com.hyperm", | "nameSpace": "com.hyperm", | December | + | "name" : "SALE_INPUT", | "source": "", | 2016*. | + | "version": "0.0.1", | "target": "", | | + | "time" : 1482265033000, | "amount": 4799, | Sale is | + | "sale_ID": 99999993, | "assistant_ID": 9, | authorize | + | "amount": 4799, | "authorised": true, | d. | + | "item_ID": 1943, | "branch_ID": 3, | | + | "quantity": 2, | "item_ID": 1943, | | + | "assistant_ID": 9, | "message": "Sale authorised | | + | "branch_ID": 3 | by policy task MorningBo | | + | } | ozeCheck for time 20:17:13 | | + | | GMT", | | + | | "notes": null, | | + | | "quantity": 2, | | + | | "sale_ID": 99999993, | | + | | "time": 1482265033000 | | + | | } | | + +------------------------------------------+-------------------------------------------+-----------+ + +4.3.6. Policy 1 in CLI Editor +############################# + + .. container:: paragraph + + An equivalent version of the ``MyFirstPolicyModel`` + policy model can again be generated using the APEX CLI + editor. A sample APEX CLI script is shown below: + + .. container:: listingblock + + .. container:: title + + APEX CLI Editor code for Policy 1 + + .. container:: content + + .. code:: + + #------------------------------------------------------------------------------- + # ============LICENSE_START======================================================= + # Copyright (C) 2016-2018 Ericsson. All rights reserved. + # ================================================================================ + # Licensed under the Apache License, Version 2.0 (the "License"); + # you may not use this file except in compliance with the License. + # You may obtain a copy of the License at + # + # http://www.apache.org/licenses/LICENSE-2.0 + # + # Unless required by applicable law or agreed to in writing, software + # distributed under the License is distributed on an "AS IS" BASIS, + # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + # See the License for the specific language governing permissions and + # limitations under the License. + # + # SPDX-License-Identifier: Apache-2.0 + # ============LICENSE_END========================================================= + #------------------------------------------------------------------------------- + + model create name=MyFirstPolicyModel version=0.0.1 uuid=540226fb-55ee-4f0e-a444-983a0494818e description="This is my first Apex Policy Model." + + schema create name=assistant_ID_type version=0.0.1 uuid=36df4c71-9616-4206-8b53-976a5cd4bd87 description="A type for 'assistant_ID' values" flavour=Java schema=java.lang.Long + + schema create name=authorised_type version=0.0.1 uuid=d48b619e-d00d-4008-b884-02d76ea4350b description="A type for 'authorised' values" flavour=Java schema=java.lang.Boolean + + schema create name=branch_ID_type version=0.0.1 uuid=6468845f-4122-4128-8e49-0f52c26078b5 description="A type for 'branch_ID' values" flavour=Java schema=java.lang.Long + + schema create name=item_ID_type version=0.0.1 uuid=4f227ff1-aee0-453a-b6b6-9a4b2e0da932 description="A type for 'item_ID' values" flavour=Java schema=java.lang.Long + + schema create name=message_type version=0.0.1 uuid=ad1431bb-3155-4e73-b5a3-b89bee498749 description="A type for 'message' values" flavour=Java schema=java.lang.String + + schema create name=notes_type version=0.0.1 uuid=eecfde90-896c-4343-8f9c-2603ced94e2d description="A type for 'notes' values" flavour=Java schema=java.lang.String + + schema create name=price_type version=0.0.1 uuid=52c2fc45-fd8c-463c-bd6f-d91b0554aea7 description="A type for 'amount'/'price' values" flavour=Java schema=java.lang.Long + + schema create name=quantity_type version=0.0.1 uuid=ac3d9842-80af-4a98-951c-bd79a431c613 description="A type for 'quantity' values" flavour=Java schema=java.lang.Integer + + schema create name=sale_ID_type version=0.0.1 uuid=cca47d74-7754-4a61-b163-ca31f66b157b description="A type for 'sale_ID' values" flavour=Java schema=java.lang.Long + + schema create name=timestamp_type version=0.0.1 uuid=fd594e88-411d-4a94-b2be-697b3a0d7adf description="A type for 'time' values" flavour=Java schema=java.lang.Long + + task create name=MorningBoozeCheck version=0.0.1 uuid=3351b0f4-cf06-4fa2-8823-edf67bd30223 description=LS + This task checks if the sales request is for an item that contains alcohol. + If the local time is between 00:00:00 and 11:30:00 then the sale is not authorised. Otherwise the sale is authorised. + In this implementation we assume that all items with item_ID values between 1000 and 2000 contain alcohol :-) + LE + task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=amount schemaName=price_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true + task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=quantity schemaName=quantity_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=item_ID schemaName=item_ID_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=time schemaName=timestamp_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=amount schemaName=price_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=quantity schemaName=quantity_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=item_ID schemaName=item_ID_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=authorised schemaName=authorised_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=time schemaName=timestamp_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=message schemaName=message_type schemaVersion=0.0.1 optional=true + task logic create name=MorningBoozeCheck version=0.0.1 logicFlavour=MVEL logic=LS + /* + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + import java.util.Date; + import java.util.Calendar; + import java.util.TimeZone; + import java.text.SimpleDateFormat; + + logger.info("Task Execution: '"+subject.id+"'. Input Fields: '"+inFields+"'"); + + outFields.put("amount" , inFields.get("amount")); + outFields.put("assistant_ID", inFields.get("assistant_ID")); + outFields.put("notes" , inFields.get("notes")); + outFields.put("quantity" , inFields.get("quantity")); + outFields.put("branch_ID" , inFields.get("branch_ID")); + outFields.put("item_ID" , inFields.get("item_ID")); + outFields.put("time" , inFields.get("time")); + outFields.put("sale_ID" , inFields.get("sale_ID")); + + item_id = inFields.get("item_ID"); + + //The events used later to test this task use GMT timezone! + gmt = TimeZone.getTimeZone("GMT"); + timenow = Calendar.getInstance(gmt); + df = new SimpleDateFormat("HH:mm:ss z"); + df.setTimeZone(gmt); + timenow.setTimeInMillis(inFields.get("time")); + + midnight = timenow.clone(); + midnight.set( + timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH), + timenow.get(Calendar.DATE),0,0,0); + eleven30 = timenow.clone(); + eleven30.set( + timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH), + timenow.get(Calendar.DATE),11,30,0); + + itemisalcohol = false; + if(item_id != null && item_id >=1000 && item_id < 2000) + itemisalcohol = true; + + if( itemisalcohol + && timenow.after(midnight) && timenow.before(eleven30)){ + outFields.put("authorised", false); + outFields.put("message", "Sale not authorised by policy task "+subject.taskName+ + " for time "+df.format(timenow.getTime())+ + ". Alcohol can not be sold between "+df.format(midnight.getTime())+ + " and "+df.format(eleven30.getTime())); + return true; + } + else{ + outFields.put("authorised", true); + outFields.put("message", "Sale authorised by policy task "+subject.taskName+ + " for time "+df.format(timenow.getTime())); + return true; + } + + /* + This task checks if a sale request is for an item that is an alcoholic drink. + If the local time is between 00:00:00 GMT and 11:30:00 GMT then the sale is not + authorised. Otherwise the sale is authorised. + In this implementation we assume that items with item_ID value between 1000 and + 2000 are all alcoholic drinks :-) + */ + LE + + event create name=SALE_AUTH version=0.0.1 uuid=c4500941-3f98-4080-a9cc-5b9753ed050b description="An event emitted by the Policy to indicate whether the sale of an item has been authorised" nameSpace=com.hyperm source="APEX" target="POS" + event parameter create name=SALE_AUTH version=0.0.1 parName=amount schemaName=price_type schemaVersion=0.0.1 + event parameter create name=SALE_AUTH version=0.0.1 parName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1 + event parameter create name=SALE_AUTH version=0.0.1 parName=authorised schemaName=authorised_type schemaVersion=0.0.1 + event parameter create name=SALE_AUTH version=0.0.1 parName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1 + event parameter create name=SALE_AUTH version=0.0.1 parName=item_ID schemaName=item_ID_type schemaVersion=0.0.1 + event parameter create name=SALE_AUTH version=0.0.1 parName=message schemaName=message_type schemaVersion=0.0.1 optional=true + event parameter create name=SALE_AUTH version=0.0.1 parName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true + event parameter create name=SALE_AUTH version=0.0.1 parName=quantity schemaName=quantity_type schemaVersion=0.0.1 + event parameter create name=SALE_AUTH version=0.0.1 parName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1 + event parameter create name=SALE_AUTH version=0.0.1 parName=time schemaName=timestamp_type schemaVersion=0.0.1 + + event create name=SALE_INPUT version=0.0.1 uuid=4f04aa98-e917-4f4a-882a-c75ba5a99374 description="An event raised by the PoS system each time an item is scanned for purchase" nameSpace=com.hyperm source="POS" target="APEX" + event parameter create name=SALE_INPUT version=0.0.1 parName=amount schemaName=price_type schemaVersion=0.0.1 + event parameter create name=SALE_INPUT version=0.0.1 parName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1 + event parameter create name=SALE_INPUT version=0.0.1 parName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1 + event parameter create name=SALE_INPUT version=0.0.1 parName=item_ID schemaName=item_ID_type schemaVersion=0.0.1 + event parameter create name=SALE_INPUT version=0.0.1 parName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true + event parameter create name=SALE_INPUT version=0.0.1 parName=quantity schemaName=quantity_type schemaVersion=0.0.1 + event parameter create name=SALE_INPUT version=0.0.1 parName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1 + event parameter create name=SALE_INPUT version=0.0.1 parName=time schemaName=timestamp_type schemaVersion=0.0.1 + + + policy create name=MyFirstPolicy version=0.0.1 uuid=6c5e410f-489a-46ff-964e-982ce6e8b6d0 description="This is my first Apex policy. It checks if a sale should be authorised or not." template=FREEFORM firstState=BoozeAuthDecide + policy state create name=MyFirstPolicy version=0.0.1 stateName=BoozeAuthDecide triggerName=SALE_INPUT triggerVersion=0.0.1 defaultTaskName=MorningBoozeCheck defaultTaskVersion=0.0.1 + policy state output create name=MyFirstPolicy version=0.0.1 stateName=BoozeAuthDecide outputName=MorningBoozeCheck_Output_Direct eventName=SALE_AUTH eventVersion=0.0.1 nextState=NULL + policy state taskref create name=MyFirstPolicy version=0.0.1 stateName=BoozeAuthDecide taskLocalName=MorningBoozeCheck taskName=MorningBoozeCheck taskVersion=0.0.1 outputType=DIRECT outputName=MorningBoozeCheck_Output_Direct + +Policy Step 2 +------------- + +Scenario +######### + .. container:: paragraph + + *HyperM* have just opened a new branch in a different + country, but that country has different rules about when + alcohol can be sold! In this section we will go through + the necessary steps to extend our policy to enforce this + for *HyperM*. + + .. container:: ulist + + - In some branches alcohol cannot be sold before 1pm, + and not at all on Sundays. + + .. container:: paragraph + + Although there are a number of ways to accomplish this + the easiest approach for us is to define another task and + then select which task is appropriate at runtime + depending on the branch identifier in the incoming event. + +Extend the Policy with the new Scenario +####################################### + + .. container:: paragraph + + To create a new Task click on the 'Tasks' tab. In the + 'Tasks' pane, right click and select 'Create new Task': + + .. container:: paragraph + + Create a new Task called ``MorningBoozeCheckAlt1``. Use + the 'Generate UUID' button to create a new unique ID for + the task, and fill in a description for the task. Select + the same input and output fields that we used earlier + when we defined the ``MorningBoozeCheck`` task earlier. + + .. table:: Table 12. Input fields for ``MorningBoozeCheckAlt1`` task + + +-----------------------------------+-----------------------------------+ + | Parameter Name | Parameter Type | + +===================================+===================================+ + | time | timestamp_type | + +-----------------------------------+-----------------------------------+ + | sale_ID | sale_ID_type | + +-----------------------------------+-----------------------------------+ + | amount | price_type | + +-----------------------------------+-----------------------------------+ + | item_ID | item_ID_type | + +-----------------------------------+-----------------------------------+ + | quantity | quantity_type | + +-----------------------------------+-----------------------------------+ + | assistant_ID | assistant_ID_type | + +-----------------------------------+-----------------------------------+ + | branch_ID | branch_ID_type | + +-----------------------------------+-----------------------------------+ + | notes | notes_type | + +-----------------------------------+-----------------------------------+ + + .. table:: Table 13. Output fields for ``MorningBoozeCheckAlt1`` task + + +-----------------------------------+-----------------------------------+ + | Parameter Name | Parameter Type | + +===================================+===================================+ + | sale_ID | sale_ID_type | + +-----------------------------------+-----------------------------------+ + | time | timestamp_type | + +-----------------------------------+-----------------------------------+ + | authorised | authorised_type | + +-----------------------------------+-----------------------------------+ + | message | message_type | + +-----------------------------------+-----------------------------------+ + | amount | price_type | + +-----------------------------------+-----------------------------------+ + | item_ID | item_ID_type | + +-----------------------------------+-----------------------------------+ + | assistant_ID | assistant_ID_type | + +-----------------------------------+-----------------------------------+ + | quantity | quantity_type | + +-----------------------------------+-----------------------------------+ + | branch_ID | branch_ID_type | + +-----------------------------------+-----------------------------------+ + | notes | notes_type | + +-----------------------------------+-----------------------------------+ + + .. container:: paragraph + + This task also requires some 'Task Logic' to implement + the new behaviour for this task. + + .. container:: paragraph + + For simplicity use the following code for the task logic. + It again assumes that all items with ``item_ID`` between + 1000 and 2000 contain alcohol. We again use the standard + ``Java`` time utilities to check if the current time is + between ``00:00:00 CET`` and ``13:00:00 CET`` or if it is + ``Sunday``. + + .. container:: paragraph + + For this task we will again author the logic using the + ```MVEL`` <https://en.wikipedia.org/wiki/MVEL>`__ + scripting language. Sample task logic code (specified in + ```MVEL`` <https://en.wikipedia.org/wiki/MVEL>`__) is + given below. For a detailed guide to how to write your + own logic in + ```JavaScript`` <https://en.wikipedia.org/wiki/JavaScript>`__, + ```MVEL`` <https://en.wikipedia.org/wiki/MVEL>`__ or one + of the other supported languages please refer to APEX + Programmers Guide. + + .. container:: listingblock + + .. container:: title + + MVEL code for the ``MorningBoozeCheckAlt1`` task + + .. container:: content + + .. code:: + + /* + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + import java.util.Date; + import java.util.Calendar; + import java.util.TimeZone; + import java.text.SimpleDateFormat; + + logger.info("Task Execution: '"+subject.id+"'. Input Event: '"+inFields+"'"); + + outFields.put("amount" , inFields.get("amount")); + outFields.put("assistant_ID", inFields.get("assistant_ID")); + outFields.put("notes" , inFields.get("notes")); + outFields.put("quantity" , inFields.get("quantity")); + outFields.put("branch_ID" , inFields.get("branch_ID")); + outFields.put("item_ID" , inFields.get("item_ID")); + outFields.put("time" , inFields.get("time")); + outFields.put("sale_ID" , inFields.get("sale_ID")); + + item_id = inFields.get("item_ID"); + + //The events used later to test this task use CET timezone! + cet = TimeZone.getTimeZone("CET"); + timenow = Calendar.getInstance(cet); + df = new SimpleDateFormat("HH:mm:ss z"); + df.setTimeZone(cet); + timenow.setTimeInMillis(inFields.get("time")); + + midnight = timenow.clone(); + midnight.set( + timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH), + timenow.get(Calendar.DATE),0,0,0); + onepm = timenow.clone(); + onepm.set( + timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH), + timenow.get(Calendar.DATE),13,0,0); + + itemisalcohol = false; + if(item_id != null && item_id >=1000 && item_id < 2000) + itemisalcohol = true; + + if( itemisalcohol && + ( (timenow.after(midnight) && timenow.before(onepm)) + || + (timenow.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) + )){ + outFields.put("authorised", false); + outFields.put("message", "Sale not authorised by policy task "+subject.taskName+ + " for time "+df.format(timenow.getTime())+ + ". Alcohol can not be sold between "+df.format(midnight.getTime())+ + " and "+df.format(onepm.getTime()) +" or on Sunday"); + return true; + } + else{ + outFields.put("authorised", true); + outFields.put("message", "Sale authorised by policy task "+subject.taskName+ + " for time "+df.format(timenow.getTime())); + return true; + } + + /* + This task checks if a sale request is for an item that is an alcoholic drink. + If the local time is between 00:00:00 CET and 13:00:00 CET then the sale is not authorised. + Also alcohol sales are not allowed on Sundays. Otherwise the sale is authorised. + In this implementation we assume that items with item_ID between 1000 and 2000 are all alcoholic drinks :-) + */ + + .. container:: imageblock + + .. container:: content + + |Create a new alternative task MorningBoozeCheckAlt1| + + .. container:: title + + Figure 19. Create a new Task + + .. container:: paragraph + + The task definition is now complete so click the 'Submit' + button to save the task. Now that we have created our + task, we can can add this task to the single pre-existing + state (``BoozeAuthDecide``) in our policy. + + .. container:: paragraph + + To edit the ``BoozeAuthDecide`` state in our policy click + on the 'Policies' tab. In the 'Policies' pane, right + click on our ``MyFirstPolicy`` policy and select 'Edit'. + Navigate to the ``BoozeAuthDecide`` state in the 'states' + section at the bottom of the policy definition pane. + + .. container:: imageblock + + .. container:: content + + |Right click to edit a policy| + + .. container:: title + + Figure 20. Edit a Policy + + .. container:: paragraph + + To add our new task ``MorningBoozeCheckAlt1``, scroll + down to the ``BoozeAuthDecide`` state in the 'States' + section. In the 'State Tasks' section for + ``BoozeAuthDecide`` use the 'Add new task' button. Select + our new ``MorningBoozeCheckAlt1`` task, and use the name + of the task as the 'Local Name' for the task. The + ``MorningBoozeCheckAlt1`` task can reuse the same + ``MorningBoozeCheck_Output_Direct`` 'Direct State Output + Mapping' that we used for the ``MorningBoozeCheck`` task. + (Recall that the role of the 'State Output Mapping' is to + select the output event for the state, and select the + next state to be executed. These both remain the same as + before.) + + .. container:: paragraph + + Since our state has more than one task we must define + some logic to determine which task should be used each + time the state is executed. This *task selection logic* + is defined in the state definition. For our + ``BoozeAuthDecide`` state we want the choice of which + task to use to be based on the ``branch_ID`` from which + the ``SALE_INPUT`` event originated. For simplicity sake + let us assume that branches with ``branch_ID`` between + ``0`` and ``999`` should use the ``MorningBoozeCheck`` + task, and the branches with with ``branch_ID`` between + ``1000`` and ``1999`` should use the + ``MorningBoozeCheckAlt1`` task. + + .. container:: paragraph + + This time, for variety, we will author the task selection + logic using the + ```JavaScript`` <https://en.wikipedia.org/wiki/JavaScript>`__ + scripting language. Sample task selection logic code + (specified in + ```JavaScript`` <https://en.wikipedia.org/wiki/JavaScript>`__) + is given below. Paste the script text into the 'Task + Selection Logic' box, and use "JAVASCRIPT" as the 'Task + Selection Logic Type / Flavour'. It is necessary to mark + one of the tasks as the 'Default Task' so that the task + selection logic always has a fallback default option in + cases where a particular task cannot be selected. In this + case the ``MorningBoozeCheck`` task can be the default + task. + + .. container:: listingblock + + .. container:: title + + JavaScript code for the ``BoozeAuthDecide`` task + selection logic + + .. container:: content + + .. code:: + + /* + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + + + var returnValueType = Java.type("java.lang.Boolean"); + var returnValue = new returnValueType(true); + + executor.logger.info("Task Selection Execution: '"+executor.subject.id+ + "'. Input Event: '"+executor.inFields+"'"); + + branchid = executor.inFields.get("branch_ID"); + taskorig = executor.subject.getTaskKey("MorningBoozeCheck"); + taskalt = executor.subject.getTaskKey("MorningBoozeCheckAlt1"); + taskdef = executor.subject.getDefaultTaskKey(); + + if(branchid >=0 && branchid <1000){ + taskorig.copyTo(executor.selectedTask); + } + else if (branchid >=1000 && branchid <2000){ + taskalt.copyTo(executor.selectedTask); + } + else{ + taskdef.copyTo(executor.selectedTask); + } + + /* + This task selection logic selects task "MorningBoozeCheck" for branches with + 0<=branch_ID<1000 and selects task "MorningBoozeCheckAlt1" for branches with + 1000<=branch_ID<2000. Otherwise the default task is selected. + In this case the default task is also "MorningBoozeCheck" + */ + + .. container:: imageblock + + .. container:: content + + |State definition with 2 Tasks and Task Selection + Logic| + + .. container:: title + + Figure 21. State definition with 2 Tasks and Task + Selection Logic + + .. container:: paragraph + + When complete don’t forget to click the 'Submit' button + at the bottom of 'Policies' pane for our + ``MyFirstPolicy`` policy after updating the + ``BoozeAuthDecide`` state. + + .. container:: paragraph + + Congratulations, you have now completed the second step + towards your first APEX policy. The policy model + containing our new policy can again be validated and + exported from the editor and saved as shown in Step 1. + + .. container:: paragraph + + The exported policy model is then available in the + directory you selected, as + `MyFirstPolicyModel_0.0.1.json <files/mfp-files/2/MyFirstPolicyModel_0.0.1.json>`__. + The exported policy can now be loaded into the APEX + Policy Engine, or can be re-loaded and edited by the APEX + Policy Editor. + +Test Policy Step 2 +################## + + .. container:: paragraph + + To start a new APEX Engine you can use the following + configuration. In a full APEX installation you can find + this configuration in + ``$APEX_HOME/examples/config/MyFirstPolicy/2/MyFirstPolicyConfigStdin2StdoutJsonEvent.json``. + Note, this has changed from the configuration file in + Step 1 to enable the ``JAVASCRIPT`` executor for our new + 'Task Selection Logic'. + + .. container:: listingblock + + .. container:: title + + JSON to load and execute *My First Policy*, read input + JSON events from ``stdin``, and emit output events to + ``stdout`` + + .. container:: content + + .. code:: + + { + "engineServiceParameters" : { + "name" : "MyFirstPolicyApexEngine", + "version" : "0.0.1", + "id" : 102, + "instanceCount" : 4, + "deploymentPort" : 12345, + "policyModelFileName" : "examples/models/MyFirstPolicy/2/MyFirstPolicyModel_0.0.1.json", + "engineParameters" : { + "executorParameters" : { + "MVEL" : { + "parameterClassName" : "org.onap.policy.apex.plugins.executor.mvel.MVELExecutorParameters" + }, + "JAVASCRIPT" : { + "parameterClassName" : "org.onap.policy.apex.plugins.executor.javascript.JavascriptExecutorParameters" + } + } + } + }, + "eventOutputParameters": { + "FirstProducer": { + "carrierTechnologyParameters" : { + "carrierTechnology" : "FILE", + "parameters" : { + "standardIO" : true + } + }, + "eventProtocolParameters" : { + "eventProtocol" : "JSON" + } + } + }, + "eventInputParameters": { + "FirstConsumer": { + "carrierTechnologyParameters" : { + "carrierTechnology" : "FILE", + "parameters" : { + "standardIO" : true + } + }, + "eventProtocolParameters" : { + "eventProtocol" : "JSON" + } + } + } + } + + .. container:: paragraph + + To test the policy try paste the following events into + the console as the APEX engine executes. Note, all tests + from Step 1 will still work perfectly since none of those + events originate from a branch with ``branch_ID`` between + ``1000`` and ``2000``. The 'Task Selection Logic' will + therefore pick the ``MorningBoozeCheck`` task as + expected, and will therefore give the same results. + + .. table:: Table 14. Inputs and Outputs when testing *My First Policy* + + +----------------------------------------------+------------------------------------------------------------+---------------------------+ + | Input Event (JSON) | Output Event (JSON) | comment | + +==============================================+============================================================+===========================+ + | .. container:: | .. container:: | Request to buy | + | | | alcohol item | + | .. container:: listingblock | .. container:: listingblock | (``item_ID=1249``) | + | | | | + | | | at *08:41:06 | + | | .. container:: content | GMT* on *Monday, | + | .. container:: content | | 02 January | + | | .. code:: | 2017*. | + | | | | + | | { | Sale is not | + | .. code:: | "nameSpace": "com.hyperm", | authorized. Uses | + | | "name": "SALE_AUTH", | the | + | | "version": "0.0.1", | ``MorningBoozeCheck`` | + | { | "source": "", | | + | "nameSpace": "com.hyperm", | "target": "", | task. | + | "name": "SALE_INPUT", | "amount": 1249, | | + | "version": "0.0.1", | "assistant_ID":12, | Note this test | + | "time": 1483346466000, | "authorised": false, | is copied from | + | "sale_ID": 99999992, | "branch_ID": 2, | Step 1 above, | + | "amount": 1249, | "item_ID": 1012, | and demonstrates | + | "item_ID": 1012, | "message": "Sale not authorised by policy ta | that the | + | "quantity": 1, | sk MorningBoozeCheck for time 08:41:06 GMT.| original | + | "assistant_ID": 12, | Alcohol can not be sold between 00:00:00 | ``MorningBoozeCheck`` | + | "branch_ID": 2 | GMT and 11:30:00 GMT", | | + | } | "notes": null, | task is | + | | "quantity": 1, | executed. | + | | "sale_ID": 99999992, | | + | | "time": 1483346466000 | | + | | } | | + +----------------------------------------------+------------------------------------------------------------+---------------------------+ + | .. container:: | .. container:: | Request to buy | + | | | alcohol | + | .. container:: listingblock | .. container:: listingblock | (``item_ID=1047``) | + | | | | + | | | at *10:14:33* on | + | | .. container:: content | *Thursday, 22 | + | .. container:: content | | December 2016*. | + | | .. code:: | | + | | | Sale is not | + | | { | authorized. Uses | + | .. code:: | "nameSpace" : "com.hyperm", | the | + | | "name" : "SALE_AUTH", | ``MorningBoozeCheckAlt1`` | + | | "version" : "0.0.1", | task. | + | { | "source" : "", | | + | | "target" : "", | | + | "nameSpace": "com.hyperm", | "sale_ID" : 99999981, | | + | "name": "SALE_INPUT", | "amount" : 299, | | + | "version": "0.0.1", | "assistant_ID": 1212, | | + | "time": 1482398073000, | "notes" : null, | | + | "sale_ID": 99999981, | "quantity" : 1, | | + | "amount": 299, | "branch_ID" : 1002, | | + | "item_ID": 1047, | "item_ID" : 1047, | | + | "quantity": 1, | "authorised" : false, | | + | "assistant_ID": 1212, | "time" : 1482398073000, | | + | "branch_ID": 1002 | "message" : "Sale not authorised by policy t | | + | } | ask MorningBoozeCheckAlt1 fortime | | + | | 10:14:33 CET. Alcohol can not be sold | | + | | between 00:00:00 CET and 13:00:00 CET or on | | + | | Sunday" | | + | | } | | + +----------------------------------------------+------------------------------------------------------------+---------------------------+ + | .. container:: | .. container:: | Request to buy | + | | | alcohol | + | .. container:: listingblock | .. container:: listingblock | (``item_ID=1443``) | + | | | | + | | | at *17:19:37* on | + | | .. container:: content | *Sunday, 18 | + | .. container:: content | | December 2016*. | + | | .. code:: | | + | | | Sale is not | + | | { | authorized. Uses | + | .. code:: | "nameSpace" : "com.hyperm", | the | + | | | ``MorningBoozeCheckAlt1`` | + | | "name" : "SALE_AUTH", | task. | + | { | | | + | "nameSpace": "com.hyperm", | "version" : "0.0.1", | | + | "name": "SALE_INPUT", | "source" : "", | | + | "version": "0.0.1", | "target" : "", | | + | "time": 1482077977000, | "sale_ID" : 99999982, | | + | "sale_ID": 99999982, | "amount" : 2199, | | + | "amount": 2199, | "assistant_ID" : 94, | | + | "item_ID": 1443, | "notes" : "Buy 3, get 1 free!!", | | + | "quantity": 12, | "quantity" : 12, | | + | "assistant_ID": 94, | "branch_ID" : 1003, | | + | "branch_ID": 1003, | "item_ID" : 1443, | | + | "notes": "Buy 3, get 1 free!!" | "authorised" : false, | | + | } | "time" : 1482077977000, | | + | | "message" : "Sale not authorised by policy t | | + | | ask MorningBoozeCheckAlt1 for | | + | | time 17:19:37 CET. Alcohol c | | + | | an not be sold between 00:00: | | + | | 00 CET and 13:00:00 CET or on | | + | | Sunday" | | + +----------------------------------------------+------------------------------------------------------------+---------------------------+ + | .. container:: | .. container:: | Request to buy | + | | | non-alcoholic | + | .. container:: listingblock | .. container:: listingblock | item | + | | | (``item_ID=5321``) | + | | | | + | | .. container:: content | at *11:13:09* on | + | .. container:: content | | *Monday, 2 | + | | .. code:: | January 2017*. | + | | | | + | | { | Sale is | + | .. code:: | "nameSpace" : "com.hyperm", | authorized. Uses | + | | "name" : "SALE_AUTH", | the | + | { | "version" : "0.0.1", | ``MorningBoozeCheckAlt1`` | + | "nameSpace": "com.hyperm", | "source" : "", | task. | + | "name": "SALE_INPUT", | "target" : "", | | + | "version": "0.0.1", | "sale_ID" : 99999983, | | + | "time": 1483351989000, | "amount" : 699, | | + | "sale_ID": 99999983, | "assistant_ID" : 2323, | | + | "amount": 699, | "notes" : "", | | + | "item_ID": 5321, | "quantity" : 1, | | + | "quantity": 1, | "branch_ID" : 1001, | | + | "assistant_ID": 2323, | "item_ID" : 5321, | | + | "branch_ID": 1001, | "authorised" : true, | | + | "notes": "" | "time" : 1483351989000, | | + | } | "message" : "Sale authorised by policy task | | + | | MorningBoozeCheckAlt1 for time 11:13:09 CET"| | + | | } | | + +----------------------------------------------+------------------------------------------------------------+---------------------------+ + +Policy 2 in CLI Editor +###################### + + .. container:: paragraph + + An equivalent version of the ``MyFirstPolicyModel`` + policy model can again be generated using the APEX CLI + editor. A sample APEX CLI script is shown below: + + .. container:: listingblock + + .. container:: title + + APEX CLI Editor code for Policy 2 + + .. container:: content + + .. code:: + + #------------------------------------------------------------------------------- + # ============LICENSE_START======================================================= + # Copyright (C) 2016-2018 Ericsson. All rights reserved. + # ================================================================================ + # Licensed under the Apache License, Version 2.0 (the "License"); + # you may not use this file except in compliance with the License. + # You may obtain a copy of the License at + # + # http://www.apache.org/licenses/LICENSE-2.0 + # + # Unless required by applicable law or agreed to in writing, software + # distributed under the License is distributed on an "AS IS" BASIS, + # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + # See the License for the specific language governing permissions and + # limitations under the License. + # + # SPDX-License-Identifier: Apache-2.0 + # ============LICENSE_END========================================================= + #------------------------------------------------------------------------------- + + model create name=MyFirstPolicyModel version=0.0.1 uuid=540226fb-55ee-4f0e-a444-983a0494818e description="This is my first Apex Policy Model." + + schema create name=assistant_ID_type version=0.0.1 uuid=36df4c71-9616-4206-8b53-976a5cd4bd87 description="A type for 'assistant_ID' values" flavour=Java schema=java.lang.Long + + schema create name=authorised_type version=0.0.1 uuid=d48b619e-d00d-4008-b884-02d76ea4350b description="A type for 'authorised' values" flavour=Java schema=java.lang.Boolean + + schema create name=branch_ID_type version=0.0.1 uuid=6468845f-4122-4128-8e49-0f52c26078b5 description="A type for 'branch_ID' values" flavour=Java schema=java.lang.Long + + schema create name=item_ID_type version=0.0.1 uuid=4f227ff1-aee0-453a-b6b6-9a4b2e0da932 description="A type for 'item_ID' values" flavour=Java schema=java.lang.Long + + schema create name=message_type version=0.0.1 uuid=ad1431bb-3155-4e73-b5a3-b89bee498749 description="A type for 'message' values" flavour=Java schema=java.lang.String + + schema create name=notes_type version=0.0.1 uuid=eecfde90-896c-4343-8f9c-2603ced94e2d description="A type for 'notes' values" flavour=Java schema=java.lang.String + + schema create name=price_type version=0.0.1 uuid=52c2fc45-fd8c-463c-bd6f-d91b0554aea7 description="A type for 'amount'/'price' values" flavour=Java schema=java.lang.Long + + schema create name=quantity_type version=0.0.1 uuid=ac3d9842-80af-4a98-951c-bd79a431c613 description="A type for 'quantity' values" flavour=Java schema=java.lang.Integer + + schema create name=sale_ID_type version=0.0.1 uuid=cca47d74-7754-4a61-b163-ca31f66b157b description="A type for 'sale_ID' values" flavour=Java schema=java.lang.Long + + schema create name=timestamp_type version=0.0.1 uuid=fd594e88-411d-4a94-b2be-697b3a0d7adf description="A type for 'time' values" flavour=Java schema=java.lang.Long + + task create name=MorningBoozeCheck version=0.0.1 uuid=3351b0f4-cf06-4fa2-8823-edf67bd30223 description=LS + This task checks if the sales request is for an item that contains alcohol. + If the local time is between 00:00:00 and 11:30:00 then the sale is not authorised. Otherwise the sale is authorised. + In this implementation we assume that all items with item_ID values between 1000 and 2000 contain alcohol :-) + LE + task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=amount schemaName=price_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true + task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=quantity schemaName=quantity_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=item_ID schemaName=item_ID_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=time schemaName=timestamp_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=amount schemaName=price_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=quantity schemaName=quantity_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=item_ID schemaName=item_ID_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=authorised schemaName=authorised_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=time schemaName=timestamp_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=message schemaName=message_type schemaVersion=0.0.1 optional=true + task logic create name=MorningBoozeCheck version=0.0.1 logicFlavour=MVEL logic=LS + /* + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + import java.util.Date; + import java.util.Calendar; + import java.util.TimeZone; + import java.text.SimpleDateFormat; + + logger.info("Task Execution: '"+subject.id+"'. Input Fields: '"+inFields+"'"); + + outFields.put("amount" , inFields.get("amount")); + outFields.put("assistant_ID", inFields.get("assistant_ID")); + outFields.put("notes" , inFields.get("notes")); + outFields.put("quantity" , inFields.get("quantity")); + outFields.put("branch_ID" , inFields.get("branch_ID")); + outFields.put("item_ID" , inFields.get("item_ID")); + outFields.put("time" , inFields.get("time")); + outFields.put("sale_ID" , inFields.get("sale_ID")); + + item_id = inFields.get("item_ID"); + + //The events used later to test this task use GMT timezone! + gmt = TimeZone.getTimeZone("GMT"); + timenow = Calendar.getInstance(gmt); + df = new SimpleDateFormat("HH:mm:ss z"); + df.setTimeZone(gmt); + timenow.setTimeInMillis(inFields.get("time")); + + midnight = timenow.clone(); + midnight.set( + timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH), + timenow.get(Calendar.DATE),0,0,0); + eleven30 = timenow.clone(); + eleven30.set( + timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH), + timenow.get(Calendar.DATE),11,30,0); + + itemisalcohol = false; + if(item_id != null && item_id >=1000 && item_id < 2000) + itemisalcohol = true; + + if( itemisalcohol + && timenow.after(midnight) && timenow.before(eleven30)){ + outFields.put("authorised", false); + outFields.put("message", "Sale not authorised by policy task "+subject.taskName+ + " for time "+df.format(timenow.getTime())+ + ". Alcohol can not be sold between "+df.format(midnight.getTime())+ + " and "+df.format(eleven30.getTime())); + return true; + } + else{ + outFields.put("authorised", true); + outFields.put("message", "Sale authorised by policy task "+subject.taskName+ + " for time "+df.format(timenow.getTime())); + return true; + } + + /* + This task checks if a sale request is for an item that is an alcoholic drink. + If the local time is between 00:00:00 GMT and 11:30:00 GMT then the sale is not + authorised. Otherwise the sale is authorised. + In this implementation we assume that items with item_ID value between 1000 and + 2000 are all alcoholic drinks :-) + */ + LE + + task create name=MorningBoozeCheckAlt1 version=0.0.1 uuid=bc6d90c9-c902-4686-afd3-925b30e39990 description=LS + This task checks if a sale request is for an item that is an alcoholic drink. + If the local time is between 00:00:00 CET and 13:00:00 CET then the sale is not authorised. + Also alcohol sales are not allowed on Sundays. Otherwise the sale is authorised. + In this implementation we assume that items with item_ID between 1000 and 2000 are all alcoholic drinks + LE + task inputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=amount schemaName=price_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true + task inputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=quantity schemaName=quantity_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=item_ID schemaName=item_ID_type schemaVersion=0.0.1 + task inputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=time schemaName=timestamp_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=amount schemaName=price_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true + task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=quantity schemaName=quantity_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=item_ID schemaName=item_ID_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=authorised schemaName=authorised_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=time schemaName=timestamp_type schemaVersion=0.0.1 + task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=message schemaName=message_type schemaVersion=0.0.1 optional=true + task logic create name=MorningBoozeCheckAlt1 version=0.0.1 logicFlavour=MVEL logic=LS + /* + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + import java.util.Date; + import java.util.Calendar; + import java.util.TimeZone; + import java.text.SimpleDateFormat; + + logger.info("Task Execution: '"+subject.id+"'. Input Event: '"+inFields+"'"); + + outFields.put("amount" , inFields.get("amount")); + outFields.put("assistant_ID", inFields.get("assistant_ID")); + outFields.put("notes" , inFields.get("notes")); + outFields.put("quantity" , inFields.get("quantity")); + outFields.put("branch_ID" , inFields.get("branch_ID")); + outFields.put("item_ID" , inFields.get("item_ID")); + outFields.put("time" , inFields.get("time")); + outFields.put("sale_ID" , inFields.get("sale_ID")); + + item_id = inFields.get("item_ID"); + + //The events used later to test this task use CET timezone! + cet = TimeZone.getTimeZone("CET"); + timenow = Calendar.getInstance(cet); + df = new SimpleDateFormat("HH:mm:ss z"); + df.setTimeZone(cet); + timenow.setTimeInMillis(inFields.get("time")); + + midnight = timenow.clone(); + midnight.set( + timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH), + timenow.get(Calendar.DATE),0,0,0); + onepm = timenow.clone(); + onepm.set( + timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH), + timenow.get(Calendar.DATE),13,0,0); + + itemisalcohol = false; + if(item_id != null && item_id >=1000 && item_id < 2000) + itemisalcohol = true; + + if( itemisalcohol && + ( (timenow.after(midnight) && timenow.before(onepm)) + || + (timenow.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) + )){ + outFields.put("authorised", false); + outFields.put("message", "Sale not authorised by policy task "+subject.taskName+ + " for time "+df.format(timenow.getTime())+ + ". Alcohol can not be sold between "+df.format(midnight.getTime())+ + " and "+df.format(onepm.getTime()) +" or on Sunday"); + return true; + } + else{ + outFields.put("authorised", true); + outFields.put("message", "Sale authorised by policy task "+subject.taskName+ + " for time "+df.format(timenow.getTime())); + return true; + } + + /* + This task checks if a sale request is for an item that is an alcoholic drink. + If the local time is between 00:00:00 CET and 13:00:00 CET then the sale is not authorised. + Also alcohol sales are not allowed on Sundays. Otherwise the sale is authorised. + In this implementation we assume that items with item_ID between 1000 and 2000 are all alcoholic drinks :-) + */ + LE + + event create name=SALE_AUTH version=0.0.1 uuid=c4500941-3f98-4080-a9cc-5b9753ed050b description="An event emitted by the Policy to indicate whether the sale of an item has been authorised" nameSpace=com.hyperm source="APEX" target="POS" + event parameter create name=SALE_AUTH version=0.0.1 parName=amount schemaName=price_type schemaVersion=0.0.1 + event parameter create name=SALE_AUTH version=0.0.1 parName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1 + event parameter create name=SALE_AUTH version=0.0.1 parName=authorised schemaName=authorised_type schemaVersion=0.0.1 + event parameter create name=SALE_AUTH version=0.0.1 parName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1 + event parameter create name=SALE_AUTH version=0.0.1 parName=item_ID schemaName=item_ID_type schemaVersion=0.0.1 + event parameter create name=SALE_AUTH version=0.0.1 parName=message schemaName=message_type schemaVersion=0.0.1 optional=true + event parameter create name=SALE_AUTH version=0.0.1 parName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true + event parameter create name=SALE_AUTH version=0.0.1 parName=quantity schemaName=quantity_type schemaVersion=0.0.1 + event parameter create name=SALE_AUTH version=0.0.1 parName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1 + event parameter create name=SALE_AUTH version=0.0.1 parName=time schemaName=timestamp_type schemaVersion=0.0.1 + + event create name=SALE_INPUT version=0.0.1 uuid=4f04aa98-e917-4f4a-882a-c75ba5a99374 description="An event raised by the PoS system each time an item is scanned for purchase" nameSpace=com.hyperm source="POS" target="APEX" + event parameter create name=SALE_INPUT version=0.0.1 parName=amount schemaName=price_type schemaVersion=0.0.1 + event parameter create name=SALE_INPUT version=0.0.1 parName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1 + event parameter create name=SALE_INPUT version=0.0.1 parName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1 + event parameter create name=SALE_INPUT version=0.0.1 parName=item_ID schemaName=item_ID_type schemaVersion=0.0.1 + event parameter create name=SALE_INPUT version=0.0.1 parName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true + event parameter create name=SALE_INPUT version=0.0.1 parName=quantity schemaName=quantity_type schemaVersion=0.0.1 + event parameter create name=SALE_INPUT version=0.0.1 parName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1 + event parameter create name=SALE_INPUT version=0.0.1 parName=time schemaName=timestamp_type schemaVersion=0.0.1 + + + policy create name=MyFirstPolicy version=0.0.1 uuid=6c5e410f-489a-46ff-964e-982ce6e8b6d0 description="This is my first Apex policy. It checks if a sale should be authorised or not." template=FREEFORM firstState=BoozeAuthDecide + policy state create name=MyFirstPolicy version=0.0.1 stateName=BoozeAuthDecide triggerName=SALE_INPUT triggerVersion=0.0.1 defaultTaskName=MorningBoozeCheck defaultTaskVersion=0.0.1 + policy state output create name=MyFirstPolicy version=0.0.1 stateName=BoozeAuthDecide outputName=MorningBoozeCheck_Output_Direct eventName=SALE_AUTH eventVersion=0.0.1 nextState=NULL + policy state taskref create name=MyFirstPolicy version=0.0.1 stateName=BoozeAuthDecide taskLocalName=MorningBoozeCheckAlt1 taskName=MorningBoozeCheckAlt1 taskVersion=0.0.1 outputType=DIRECT outputName=MorningBoozeCheck_Output_Direct + policy state taskref create name=MyFirstPolicy version=0.0.1 stateName=BoozeAuthDecide taskLocalName=MorningBoozeCheck taskName=MorningBoozeCheck taskVersion=0.0.1 outputType=DIRECT outputName=MorningBoozeCheck_Output_Direct + policy state selecttasklogic create name=MyFirstPolicy version=0.0.1 stateName=BoozeAuthDecide logicFlavour=JAVASCRIPT logic=LS + /* + * ============LICENSE_START======================================================= + * Copyright (C) 2016-2018 Ericsson. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * SPDX-License-Identifier: Apache-2.0 + * ============LICENSE_END========================================================= + */ + + var returnValueType = Java.type("java.lang.Boolean"); + var returnValue = new returnValueType(true); + + executor.logger.info("Task Selection Execution: '"+executor.subject.id+"'. Input Event: '"+executor.inFields+"'"); + + branchid = executor.inFields.get("branch_ID"); + taskorig = executor.subject.getTaskKey("MorningBoozeCheck"); + taskalt = executor.subject.getTaskKey("MorningBoozeCheckAlt1"); + taskdef = executor.subject.getDefaultTaskKey(); + + if(branchid >=0 && branchid <1000){ + taskorig.copyTo(executor.selectedTask); + } + else if (branchid >=1000 && branchid <2000){ + taskalt.copyTo(executor.selectedTask); + } + else{ + taskdef.copyTo(executor.selectedTask); + } + + /* + This task selection logic selects task "MorningBoozeCheck" for branches with 0<=branch_ID<1000 and selects task "MorningBoozeCheckAlt1" for branches with 1000<=branch_ID<2000. Otherwise the default task is selected. In this case the default task is also "MorningBoozeCheck" + */ + LE + +APEX Logging +^^^^^^^^^^^^ + +Introduction to APEX Logging +---------------------------- + + .. container:: paragraph + + All APEX components make extensive use of logging using the + logging façade `SLF4J <https://www.slf4j.org/>`__ with the + backend `Logback <https://logback.qos.ch/>`__. Both are used + off-the-shelve, so the standard documentation and + configuration apply to APEX logging. For details on how to + work with logback please see the `logback + manual <https://logback.qos.ch/manual/index.html>`__. + + .. container:: paragraph + + The APEX applications is the logback configuration file + ``$APEX_HOME/etc/logback.xml`` (Windows: + ``%APEX_HOME%\etc\logback.xml``). The logging backend is set + to no debug, i.e. logs from the logging framework should be + hidden at runtime. + + .. container:: paragraph + + The configurable log levels work as expected: + + .. container:: ulist + + - *error* (or *ERROR*) is used for serious errors in the + APEX runtime engine + + - *warn* (or *WARN*) is used for warnings, which in general + can be ignored but might indicate some deeper problems + + - *info* (or *INFO*) is used to provide generally + interesting messages for startup and policy execution + + - *debug* (or *DEBUG*) provides more details on startup and + policy execution + + - *trace* (or *TRACE*) gives full details on every aspect + of the APEX engine from start to end + + .. container:: paragraph + + The loggers can also be configured as expected. The standard + configuration (after installing APEX) uses log level *info* + on all APEX classes (components). + + .. container:: paragraph + + The applications and scripts in ``$APEX_HOME/bin`` (Windows: + ``%APEX_HOME\bin``) are configured to use the logback + configuration ``$APEX_HOME/etc/logback.xml`` (Windows: + ``%APEX_HOME\etc\logback.xml``). There are multiple ways to + use different logback configurations, for instance: + + .. container:: ulist + + - Maintain multiple configurations in ``etc``, for instance + a ``logback-debug.xml`` for deep debugging and a + ``logback-production.xml`` for APEX in production mode, + then copy the required configuration file to the used + ``logback.xml`` prior starting APEX + + - Edit the scripts in ``bin`` to use a different logback + configuration file (only recommended if you are familiar + with editing bash scripts or windows batch files) + +Standard Logging Configuration +------------------------------ + + .. container:: paragraph + + The standard logging configuration defines a context *APEX*, + which is used in the standard output pattern. The location + for log files is defined in the property ``VAR_LOG`` and set + to ``/var/log/onap/policy/apex-pdp``. The standard status + listener is set to *NOP* and the overall logback + configuration is set to no debug. + + .. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + <configuration debug="false"> + <statusListener class="ch.qos.logback.core.status.NopStatusListener" /> + + <contextName>Apex</contextName> + <property name="VAR_LOG" value="/var/log/onap/policy/apex-pdp/" /> + + ...appenders + ...loggers + </configuration> + +.. container:: paragraph + + The first appender defined is called ``STDOUT`` for logs to standard + out. + +.. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> + <encoder> + <Pattern>%d %contextName [%t] %level %logger{36} - %msg%n</Pattern> + </encoder> + </appender> + +.. container:: paragraph + + The root level logger then is set to the level *info* using the + standard out appender. + +.. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + <root level="info"> + <appender-ref ref="STDOUT" /> + </root> + +.. container:: paragraph + + The second appender is called ``FILE``. It writes logs to a file + ``apex.log``. + +.. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + <appender name="FILE" class="ch.qos.logback.core.FileAppender"> + <file>${VAR_LOG}/apex.log</file> + <encoder> + <pattern>%d %-5relative [procId=${processId}] [%thread] %-5level %logger{26} - %msg %n %ex{full}</pattern> + </encoder> + </appender> + +.. container:: paragraph + + The third appender is called ``CTXT_FILE``. It writes logs to a file + ``apex_ctxt.log``. + +.. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + <appender name="CTXT_FILE" class="ch.qos.logback.core.FileAppender"> + <file>${VAR_LOG}/apex_ctxt.log</file> + <encoder> + <pattern>%d %-5relative [procId=${processId}] [%thread] %-5level %logger{26} - %msg %n %ex{full}</pattern> + </encoder> + </appender> + +.. container:: paragraph + + The last definitions are for specific loggers. The first logger + captures all standard APEX classes. It is configured for log level + *info* and uses the standard output and file appenders. The second + logger captures APEX context classes responsible for context + monitoring. It is configured for log level *trace* and uses the + context file appender. + +.. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + + <logger name="org.onap.policy.apex" level="info" additivity="false"> + <appender-ref ref="STDOUT" /> + <appender-ref ref="FILE" /> + </logger> + + <logger name="org.onap.policy.apex.core.context.monitoring" level="TRACE" additivity="false"> + <appender-ref ref="CTXT_FILE" /> + </logger> + +Adding Logback Status and Debug +------------------------------- + + .. container:: paragraph + + To activate logback status messages change the status listener + from 'NOP' to for instance console. + + .. container:: listingblock + + .. container:: content + + .. code:: + + <statusListener class="ch.qos.logback.core.status.OnConsoleStatusListener" /> + + .. container:: paragraph + + To activate all logback debugging, for instance to debug a new + logback configuration, activate the debug attribute in the + configuration. + + .. container:: listingblock + + .. container:: content + + .. code:: + + <configuration debug="true"> + ... + </configuration> + +Logging External Components +--------------------------- + + .. container:: paragraph + + Logback can also be configured to log any other, external + components APEX is using, if they are using the common logging + framework. + + .. container:: paragraph + + For instance, the context component of APEX is using *Infinispan* + and one can add a logger for this external component. The + following example adds a logger for *Infinispan* using the + standard output appender. + + .. container:: listingblock + + .. container:: content + + .. code:: + + <logger name="org.infinispan" level="INFO" additivity="false"> + <appender-ref ref="STDOUT" /> + </logger> + + .. container:: paragraph + + Another example is Apache Zookeeper. The following example adds a + logger for Zookeeper using the standard outout appender. + + .. container:: listingblock + + .. container:: content + + .. code:: + + <logger name="org.apache.zookeeper.ClientCnxn" level="INFO" additivity="false"> + <appender-ref ref="STDOUT" /> + </logger> + +Configuring loggers for Policy Logic +------------------------------------ + + .. container:: paragraph + + The logging for the logic inside a policy (task logic, task + selection logic, state finalizer logic) can be configured separate + from standard logging. The logger for policy logic is + ``org.onap.policy.apex.executionlogging``. The following example + defines + + .. container:: ulist + + - a new appender for standard out using a very simple pattern + (simply the actual message) + + - a logger for policy logic to standard out using the new + appender and the already described file appender. + + .. container:: listingblock + + .. container:: content + + .. code:: + + <appender name="POLICY_APPENDER_STDOUT" class="ch.qos.logback.core.ConsoleAppender"> + <encoder> + <pattern>policy: %msg\n</pattern> + </encoder> + </appender> + + <logger name="org.onap.policy.apex.executionlogging" level="info" additivity="false"> + <appender-ref ref="POLICY_APPENDER_STDOUT" /> + <appender-ref ref="FILE" /> + </logger> + + .. container:: paragraph + + It is also possible to use specific logging for parts of policy + logic. The following example defines a logger for task logic. + + .. container:: listingblock + + .. container:: content + + .. code:: + + <logger name="org.onap.policy.apex.executionlogging.TaskExecutionLogging" level="TRACE" additivity="false"> + <appender-ref ref="POLICY_APPENDER_STDOUT" /> + </logger> + +Rolling File Appenders +---------------------- + + .. container:: paragraph + + Rolling file appenders are a good option for more complex logging + of a production or complex testing APEX installation. The standard + logback configuration can be used for these use cases. This + section gives two examples for the standard logging and for + context logging. + + .. container:: paragraph + + First the standard logging. The following example defines a + rolling file appender. The appender rolls over on a daily basis. + It allows for a file size of 100 MB. + + .. container:: listingblock + + .. container:: content + + .. code:: + + <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> + <file>${VAR_LOG}/apex.log</file> + <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> + <!-- rollover daily --> + <!-- <fileNamePattern>xstream-%d{yyyy-MM-dd}.%i.txt</fileNamePattern> --> + <fileNamePattern>${VAR_LOG}/apex_%d{yyyy-MM-dd}.%i.log.gz + </fileNamePattern> + <maxHistory>4</maxHistory> + <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"> + <!-- or whenever the file size reaches 100MB --> + <maxFileSize>100MB</maxFileSize> + </timeBasedFileNamingAndTriggeringPolicy> + </rollingPolicy> + <encoder> + <pattern> + %d %-5relative [procId=${processId}] [%thread] %-5level %logger{26} - %msg %ex{full} %n + </pattern> + </encoder> + </appender> + + .. container:: paragraph + + A very similar configuration can be used for a rolling file + appender logging APEX context. + + .. container:: listingblock + + .. container:: content + + .. code:: + + <appender name="CTXT-FILE" + class="ch.qos.logback.core.rolling.RollingFileAppender"> + <file>${VAR_LOG}/apex_ctxt.log</file> + <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> + <fileNamePattern>${VAR_LOG}/apex_ctxt_%d{yyyy-MM-dd}.%i.log.gz + </fileNamePattern> + <maxHistory>4</maxHistory> + <timeBasedFileNamingAndTriggeringPolicy + class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"> + <maxFileSize>100MB</maxFileSize> + </timeBasedFileNamingAndTriggeringPolicy> + </rollingPolicy> + <encoder> + <pattern> + %d %-5relative [procId=${processId}] [%thread] %-5level %logger{26} - %msg %ex{full} %n + </pattern> + </encoder> + </appender> + +Example Configuration for Logging Logic +--------------------------------------- + + .. container:: paragraph + + The following example shows a configuration that logs policy logic + to standard out and a file (*info*). All other APEX components are + logging to a file (*debug*).. This configuration an be used in a + pre-production phase with the APEX engine still running in a + separate terminal to monitor policy execution. This logback + configuration is in the APEX installation as + ``etc/logback-logic.xml``. + + .. container:: listingblock + + .. container:: content + + .. code:: + + <configuration debug="false"> + <statusListener class="ch.qos.logback.core.status.NopStatusListener" /> + + <contextName>Apex</contextName> + <property name="VAR_LOG" value="/var/log/onap/policy/apex-pdp/" /> + + <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> + <encoder> + <Pattern>%d %contextName [%t] %level %logger{36} - %msg%n</Pattern> + </encoder> + </appender> + + <appender name="FILE" class="ch.qos.logback.core.FileAppender"> + <file>${VAR_LOG}/apex.log</file> + <encoder> + <pattern> + %d %-5relative [procId=${processId}] [%thread] %-5level%logger{26} - %msg %n %ex{full} + </pattern> + </encoder> + </appender> + + <appender name="POLICY_APPENDER_STDOUT" class="ch.qos.logback.core.ConsoleAppender"> + <encoder> + <pattern>policy: %msg\n</pattern> + </encoder> + </appender> + + <root level="error"> + <appender-ref ref="STDOUT" /> + </root> + + <logger name="org.onap.policy.apex" level="debug" additivity="false"> + <appender-ref ref="FILE" /> + </logger> + + <logger name="org.onap.policy.apex.executionlogging" level="info" additivity="false"> + <appender-ref ref="POLICY_APPENDER_STDOUT" /> + <appender-ref ref="FILE" /> + </logger> + </configuration> + +Example Configuration for a Production Server +--------------------------------------------- + + .. container:: paragraph + + The following example shows a configuration that logs all APEX + components, including policy logic, to a file (*debug*). This + configuration an be used in a production phase with the APEX + engine being executed as a service on a system without console + output. This logback configuration is in the APEX installation as + ``logback-server.xml`` + + .. container:: listingblock + + .. container:: content + + .. code:: + + <configuration debug="false"> + <statusListener class="ch.qos.logback.core.status.NopStatusListener" /> + + <contextName>Apex</contextName> + <property name="VAR_LOG" value="/var/log/onap/policy/apex-pdp/" /> + + <appender name="FILE" class="ch.qos.logback.core.FileAppender"> + <file>${VAR_LOG}/apex.log</file> + <encoder> + <pattern> + %d %-5relative [procId=${processId}] [%thread] %-5level%logger{26} - %msg %n %ex{full} + </pattern> + </encoder> + </appender> + + <root level="debug"> + <appender-ref ref="FILE" /> + </root> + + <logger name="org.onap.policy.apex.executionlogging" level="debug" additivity="false"> + <appender-ref ref="FILE" /> + </logger> + </configuration> + +Building a System with Websocket Backend +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Websockets +---------- + + .. container:: paragraph + + Websocket is a protocol to run sockets of HTTP. Since it in + essence a socket, the connection is realized between a + server (waiting for connections) and a client (connecting to + a server). Server/client separation is only important for + connection establishment, once connected, everyone can + send/receive on the same socket (as any standard socket + would allow). + + .. container:: paragraph + + Standard Websocket implementations are simple, no + publish/subscribe and no special event handling. Most + servers simply send all incoming messages to all + connections. There is a PubSub definition on top of + Websocket called `WAMP <http://wamp-proto.org/>`__. APEX + does not support WAMP at the moment. + +Websocket in Java +----------------- + + .. container:: paragraph + + In Java, `JSR + 356 <http://www.oracle.com/technetwork/articles/java/jsr356-1937161.html>`__ + defines the standard Websocket API. This JSR is part of Jave + EE 7 standard. For Java SE, several implementations exist in + open source. Since Websockets are a stable standard and + simple, most implementations are stable and ready to use. A + lot of products support Websockets, like Spring, JBoss, + Netty, … there are also Kafka extensions for Websockets. + +Websocket Example Code for Websocket clients (FOSS) +--------------------------------------------------- + + .. container:: paragraph + + There are a lot of implementations and examples available on + Github for Websocket clients. If one is using Java EE 7, + then one can also use the native Websocket implementation. + Good examples for clients using simply Java SE are here: + + .. container:: ulist + + - `Websocket + implementation <https://github.com/TooTallNate/Java-WebSocket>`__ + + - `Websocket sending client example, using + AWT <https://github.com/TooTallNate/Java-WebSocket/blob/master/src/main/example/ChatClient.java>`__ + + - `Websocket receiving client example (simple echo + client) <https://github.com/TooTallNate/Java-WebSocket/blob/master/src/main/example/ExampleClient.java>`__ + + .. container:: paragraph + + For Java EE, the native Websocket API is explained here: + + .. container:: ulist + + - `Oracle + docs <http://www.oracle.com/technetwork/articles/java/jsr356-1937161.html>`__ + + - link: `An + example <http://www.programmingforliving.com/2013/08/jsr-356-java-api-for-websocket-client-api.html>`__ + +BCP: Websocket Configuration +---------------------------- + + .. container:: paragraph + + The probably best is to configure APEX for Websocket servers + for input (ingress, consume) and output (egress, produce) + interfaces. This means that APEX will start Websocket + servers on named ports and wait for clients to connect. + Advantage: once APEX is running all connectivity + infrastructure is running as well. Consequence: if APEX is + not running, everyone else is in the dark, too. + + .. container:: paragraph + + The best protocol to be used is JSON string. Each event on + any interface is then a string with a JSON encoding. JSON + string is a little bit slower than byte code, but we doubt + that this will be noticeable. A further advantage of JSON + strings over Websockets with APEX starting the servers: it + is very easy to connect web browsers to such a system. + Simple connect the web browser to the APEX sockets and + send/read JSON strings. + + .. container:: paragraph + + Once APEX is started you simply connect Websocket clients to + it, and send/receive event. When APEX is terminated, the + Websocket servers go down, and the clients will be + disconnected. APEX does not (yet) support auto-client + reconnect nor WAMP, so clients might need to be restarted or + reconnected manually after an APEX boot. + +Demo with VPN Policy Model +-------------------------- + + .. container:: paragraph + + We assume that you have an APEX installation using the full + package, i.e. APEX with all examples, of version ``0.5.6`` + or higher. We will use the VPN policy from the APEX examples + here. + + .. container:: paragraph + + Now, have the following ready to start the demo: + + .. container:: ulist + + - 3 terminals on the host where APEX is running (we need 1 + for APEX and 1 for each client) + + - the events in the file + ``$APEX_HOME/examples/events/VPN/SetupEvents.json`` open + in an editor (we need to send those events to APEX) + + - the events in the file + ``$APEX_HOME/examples/events/VPN/Link09Events.json`` open + in an editor (we need to send those events to APEX) + +A Websocket Configuration for the VPN Domain +############################################ + + .. container:: paragraph + + Create a new APEX configuration using the VPN policy + model and configuring APEX as discussed above for + Websockets. Copy the following configuration into + ``$APEX_HOME/examples/config/VPN/Ws2WsServerAvroContextJsonEvent.json`` + (for Windows use + ``%APEX_HOME%\examples\config\VPN\Ws2WsServerAvroContextJsonEvent.json``): + + .. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + { + "engineServiceParameters" : { + "name" : "VPNApexEngine", + "version" : "0.0.1", + "id" : 45, + "instanceCount" : 1, + "deploymentPort" : 12345, + "policyModelFileName" : "examples/models/VPN/VPNPolicyModelAvro.json", + "engineParameters" : { + "executorParameters" : { + "MVEL" : { + "parameterClassName" : "org.onap.policy.apex.plugins.executor.mvel.MVELExecutorParameters" + } + }, + "contextParameters" : { + "parameterClassName" : "org.onap.policy.apex.context.parameters.ContextParameters", + "schemaParameters":{ + "Avro":{ + "parameterClassName" : "org.onap.policy.apex.plugins.context.schema.avro.AvroSchemaHelperParameters" + } + } + } + } + }, + "producerCarrierTechnologyParameters" : { + "carrierTechnology" : "WEBSOCKET", + "parameterClassName" : "org.onap.policy.apex.plugins.event.carrier.websocket.WEBSOCKETCarrierTechnologyParameters", + "parameters" : { + "wsClient" : false, + "port" : 42452 + } + }, + "producerEventProtocolParameters" : { + "eventProtocol" : "JSON" + }, + "consumerCarrierTechnologyParameters" : { + "carrierTechnology" : "WEBSOCKET", + "parameterClassName" : "org.onap.policy.apex.plugins.event.carrier.websocket.WEBSOCKETCarrierTechnologyParameters", + "parameters" : { + "wsClient" : false, + "port" : 42450 + } + }, + "consumerEventProtocolParameters" : { + "eventProtocol" : "JSON" + } + } + +Start APEX Engine +################# + + .. container:: paragraph + + In a new terminal, start APEX with the new configuration for + Websocket-Server ingress/egress: + + .. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + #: $APEX_HOME/bin/apexEngine.sh -c $APEX_HOME/examples/config/VPN/Ws2WsServerAvroContextJsonEvent.json + +.. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + #: %APEX_HOME%\bin\apexEngine.bat -c %APEX_HOME%\examples\config\VPN\Ws2WsServerAvroContextJsonEvent.json + +.. container:: paragraph + + Wait for APEX to start, it takes a while to create all Websocket + servers (about 8 seconds on a standard laptop without cached + binaries). depending on your log messages, you will see no (some, a + lot) log messages. If APEX starts correctly, the last few messages + you should see are: + +.. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + 2017-07-28 13:17:20,834 Apex [main] INFO c.e.a.s.engine.runtime.EngineService - engine model VPNPolicyModelAvro:0.0.1 added to the engine-AxArtifactKey:(name=VPNApexEngine-0,version=0.0.1) + 2017-07-28 13:17:21,057 Apex [Apex-apex-engine-service-0:0] INFO c.e.a.s.engine.runtime.EngineService - Engine AxArtifactKey:(name=VPNApexEngine-0,version=0.0.1) processing ... + 2017-07-28 13:17:21,296 Apex [main] INFO c.e.a.s.e.r.impl.EngineServiceImpl - Added the action listener to the engine + Started Apex service + +.. container:: paragraph + + APEX is running in the new terminal and will produce output when the + policy is triggered/executed. + +Run the Websocket Echo Client +############################# + + .. container:: paragraph + + The echo client is included in an APEX full installation. To run + the client, open a new shell (Unix, Cygwin) or command prompt + (``cmd`` on Windows). Then use the APEX application launcher to + start the client. + + .. important:: + APEX engine needs to run first + The example assumes that an APEX engine configured for *produce* carrier technology Websocket and *JSON* event protocol is executed first. + + +---------------------------------------------------------+-----------------------------------------------------------+ + | Unix, Cygwin | Windows | + +=========================================================+===========================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: listingblock | .. container:: listingblock | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: | .. code:: | + | | | + | # $APEX_HOME/bin/apexApps.sh ws-echo [args] | > %APEX_HOME%\bin\apexApps.bat ws-echo [args] | + +---------------------------------------------------------+-----------------------------------------------------------+ + + .. container:: paragraph + + Use the following command line arguments for server and port of + the Websocket server. The port should be the same as configured in + the APEX engine. The server host should be the host on which the + APEX engine is running + + .. container:: ulist + + - ``-p`` defines the Websocket port to connect to (defaults to + ``8887``) + + - ``-s`` defines the host on which a Websocket server is running + (defaults to ``localhost``) + + .. container:: paragraph + + Let’s assume that there is an APEX engine running, configured for + produce Websocket carrier technology, as server, for port 42452, + with produce event protocol JSON,. If we start the console client + on the same host, we can omit the ``-s`` options. We start the + console client as: + + .. container:: listingblock + + .. container:: content + + .. code:: + + # $APEX_HOME/bin/apexApps.sh ws-echo -p 42452 (1) + > %APEX_HOME%\bin\apexApps.bat ws-echo -p 42452 (2) + + .. container:: colist arabic + + +-------+--------------------------------+ + | **1** | Start client on Unix or Cygwin | + +-------+--------------------------------+ + | **2** | Start client on Windows | + +-------+--------------------------------+ + + .. container:: paragraph + + Once started successfully, the client will produce the following + messages (assuming we used ``-p 42452`` and an APEX engine is + running on ``localhost`` with the same port: + + .. container:: listingblock + + .. container:: content + + .. code:: + + ws-simple-echo: starting simple event echo + --> server: localhost + --> port: 42452 + + Once started, the application will simply print out all received events to standard out. + Each received event will be prefixed by '---' and suffixed by '====' + + + ws-simple-echo: opened connection to APEX (Web Socket Protocol Handshake) + +Run the Websocket Console Client +################################ + + .. container:: paragraph + + The console client is included in an APEX full installation. To + run the client, open a new shell (Unix, Cygwin) or command prompt + (``cmd`` on Windows). Then use the APEX application launcher to + start the client. + + .. important:: + APEX engine needs to run first + The example assumes that an APEX engine configured for *consume* carrier technology Websocket and *JSON* event + protocol is executed first. + + +------------------------------------------------------------+--------------------------------------------------------------+ + | Unix, Cygwin | Windows | + +============================================================+==============================================================+ + | .. container:: | .. container:: | + | | | + | .. container:: listingblock | .. container:: listingblock | + | | | + | .. container:: content | .. container:: content | + | | | + | .. code:: | .. code:: | + | | | + | # $APEX_HOME/bin/apexApps.sh ws-console [args] | > %APEX_HOME%\bin\apexApps.bat ws-console [args] | + +------------------------------------------------------------+--------------------------------------------------------------+ + + .. container:: paragraph + + Use the following command line arguments for server and port of + the Websocket server. The port should be the same as configured in + the APEX engine. The server host should be the host on which the + APEX engine is running + + .. container:: ulist + + - ``-p`` defines the Websocket port to connect to (defaults to + ``8887``) + + - ``-s`` defines the host on which a Websocket server is running + (defaults to ``localhost``) + + .. container:: paragraph + + Let’s assume that there is an APEX engine running, configured for + consume Websocket carrier technology, as server, for port 42450, + with consume event protocol JSON,. If we start the console client + on the same host, we can omit the ``-s`` options. We start the + console client as: + + .. container:: listingblock + + .. container:: content + + .. code:: + + # $APEX_HOME/bin/apexApps.sh ws-console -p 42450 (1) + > %APEX_HOME%\bin\apexApps.sh ws-console -p 42450 (2) + + .. container:: colist arabic + + +-------+--------------------------------+ + | **1** | Start client on Unix or Cygwin | + +-------+--------------------------------+ + | **2** | Start client on Windows | + +-------+--------------------------------+ + + .. container:: paragraph + + Once started successfully, the client will produce the following + messages (assuming we used ``-p 42450`` and an APEX engine is + running on ``localhost`` with the same port: + + .. container:: listingblock + + .. container:: content + + .. code:: + + ws-simple-console: starting simple event console + --> server: localhost + --> port: 42450 + + - terminate the application typing 'exit<enter>' or using 'CTRL+C' + - events are created by a non-blank starting line and terminated by a blank line + + + ws-simple-console: opened connection to APEX (Web Socket Protocol Handshake) + +Send Events +########### + + .. container:: paragraph + + Now you have the full system up and running: + + .. container:: ulist + + - Terminal 1: APEX ready and loaded + + - Terminal 2: an echo client, printing received messages produced + by the VPN policy + + - Terminal 2: a console client, waiting for input on the console + (standard in) and sending text to APEX + + .. container:: paragraph + + We started the engine with the VPN policy example. So all the + events we are using now are located in files in the following + example directory: + + .. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + #: $APEX_HOME/examples/events/VPN + > %APEX_HOME%\examples\events\VPN + +.. container:: paragraph + + To sends events, simply copy the content of the event files into + Terminal 3 (the console client). It will read multi-line JSON text + and send the events. So copy the content of ``SetupEvents.json`` into + the client. APEX will trigger a policy and produce some output, the + echo client will also print some events created in the policy. In + Terminal 1 (APEX) you’ll see some status messages from the policy as: + +.. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + {Link=L09, LinkUp=true} + L09 true + outFields: {Link=L09, LinkUp=true} + {Link=L10, LinkUp=true} + L09 true + L10 true + outFields: {Link=L10, LinkUp=true} + {CustomerName=C, LinkList=L09 L10, SlaDT=300, YtdDT=300} + *** Customers *** + C 300 300 [L09, L10] + outFields: {CustomerName=C, LinkList=L09 L10, SlaDT=300, YtdDT=300} + {CustomerName=A, LinkList=L09 L10, SlaDT=300, YtdDT=50} + *** Customers *** + A 300 50 [L09, L10] + C 300 300 [L09, L10] + outFields: {CustomerName=A, LinkList=L09 L10, SlaDT=300, YtdDT=50} + {CustomerName=D, LinkList=L09 L10, SlaDT=300, YtdDT=400} + *** Customers *** + A 300 50 [L09, L10] + C 300 300 [L09, L10] + D 300 400 [L09, L10] + outFields: {CustomerName=D, LinkList=L09 L10, SlaDT=300, YtdDT=400} + {CustomerName=B, LinkList=L09 L10, SlaDT=300, YtdDT=299} + *** Customers *** + A 300 50 [L09, L10] + B 300 299 [L09, L10] + C 300 300 [L09, L10] + D 300 400 [L09, L10] + outFields: {CustomerName=B, LinkList=L09 L10, SlaDT=300, YtdDT=299} + +.. container:: paragraph + + In Terminal 2 (echo-client) you see the received events, the last two + should look like: + +.. container:: listingblock + + .. container:: content + + .. code:: + :number-lines: + + ws-simple-echo: received + --------------------------------- + { + "name": "VPNCustomerCtxtActEvent", + "version": "0.0.1", + "nameSpace": "org.onap.policy.apex.domains.vpn.events", + "source": "Source", + "target": "Target", + "CustomerName": "C", + "LinkList": "L09 L10", + "SlaDT": 300, + "YtdDT": 300 + } + ================================= + + ws-simple-echo: received + --------------------------------- + { + "name": "VPNCustomerCtxtActEvent", + "version": "0.0.1", + "nameSpace": "org.onap.policy.apex.domains.vpn.events", + "source": "Source", + "target": "Target", + "CustomerName": "D", + "LinkList": "L09 L10", + "SlaDT": 300, + "YtdDT": 400 + } + ================================= + +.. container:: paragraph + + Congratulations, you have triggered a policy in APEX using + Websockets, the policy did run through, created events, picked up by + the echo-client. + +.. container:: paragraph + + Now you can send the Link 09 and Link 10 events, they will trigger + the actual VPN policy and some calculations are made. Let’s take the + Link 09 events from ``Link09Events.json``, copy them all into + Terminal 3 (the console). APEX will run the policy (with some status + output), and the echo client will receive and print events. + +.. container:: paragraph + + To terminate the applications, simply press ``CTRL+C`` in Terminal 1 + (APEX). This will also terminate the echo-client in Terminal 2. Then + type ``exit<enter>`` in Terminal 3 (or ``CTRL+C``) to terminate the + console-client. + +.. container:: + :name: footer + + .. container:: + :name: footer-text + + 2.0.0-SNAPSHOT + Last updated 2018-09-10 15:38:16 IST + +.. |Extract the TAR archive| image:: images/install-guide/win-extract-tar-gz.png +.. |Extract the APEX distribution| image:: images/install-guide/win-extract-tar.png +.. |REST Editor Start Screen| image:: images/install-guide/rest-start.png +.. |REST Editor with loaded SampleDomain Policy Model| image:: images/install-guide/rest-loaded.png +.. |APEX Configuration Matrix| image:: images/apex-intro/ApexEngineConfig.png +.. |File > New to create a new Policy Model| image:: images/mfp/MyFirstPolicy_P1_newPolicyModel1.png +.. |Create a new Policy Model| image:: images/mfp/MyFirstPolicy_P1_newPolicyModel2.png +.. |Right click to create a new event| image:: images/mfp/MyFirstPolicy_P1_newEvent1.png +.. |Fill in the necessary information for the 'SALE_INPUT' event and click 'Submit'| image:: images/mfp/MyFirstPolicy_P1_newEvent2.png +.. |Right click to create a new Item Schema| image:: images/mfp/MyFirstPolicy_P1_newItemSchema1.png +.. |Create a new Item Schema| image:: images/mfp/MyFirstPolicy_P1_newItemSchema2.png +.. |Add new event parameters to an event| image:: images/mfp/MyFirstPolicy_P1_newEvent3.png +.. |Right click to create a new task| image:: images/mfp/MyFirstPolicy_P1_newTask1.png +.. |Add input and out fields for the task| image:: images/mfp/MyFirstPolicy_P1_newTask2.png +.. |Add task logic the task| image:: images/mfp/MyFirstPolicy_P1_newTask3.png +.. |Create a new policy| image:: images/mfp/MyFirstPolicy_P1_newPolicy1.png +.. |Create a state| image:: images/mfp/MyFirstPolicy_P1_newState1.png +.. |Add a Task and Output Mapping| image:: images/mfp/MyFirstPolicy_P1_newState2.png +.. |Validate the policy model for error using the 'Model' > 'Validate' menu item| image:: images/mfp/MyFirstPolicy_P1_validatePolicyModel.png +.. |Download the completed policy model using the 'File' > 'Download' menu item| image:: images/mfp/MyFirstPolicy_P1_exportPolicyModel1.png +.. |Create a new alternative task MorningBoozeCheckAlt1| image:: images/mfp/MyFirstPolicy_P2_newTask1.png +.. |Right click to edit a policy| image:: images/mfp/MyFirstPolicy_P2_editPolicy1.png +.. |State definition with 2 Tasks and Task Selection Logic| image:: images/mfp/MyFirstPolicy_P2_editState1.png + diff --git a/docs/apex/apex.rst b/docs/apex/apex.rst new file mode 100644 index 00000000..23517eff --- /dev/null +++ b/docs/apex/apex.rst @@ -0,0 +1,15 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. + +.. _apex-doc: + +APEX PDP +------------------------------------------------ +.. toctree:: + :maxdepth: 1 + + APEX-Introduction.rst + APEX-User-Manual.rst + APEX-Policy-Guide.rst + APEX-Developer-Guide.rst + APEX-Install-Guide.rst + APEX-OnapPf-Guide.rst diff --git a/docs/apex/images/apex-intro/ApexEcosystem.png b/docs/apex/images/apex-intro/ApexEcosystem.png Binary files differnew file mode 100644 index 00000000..dec2b4a8 --- /dev/null +++ b/docs/apex/images/apex-intro/ApexEcosystem.png diff --git a/docs/apex/images/apex-intro/ApexEngineConfig.png b/docs/apex/images/apex-intro/ApexEngineConfig.png Binary files differnew file mode 100644 index 00000000..93ebf631 --- /dev/null +++ b/docs/apex/images/apex-intro/ApexEngineConfig.png diff --git a/docs/apex/images/apex-intro/ApexPolicyMatrix.png b/docs/apex/images/apex-intro/ApexPolicyMatrix.png Binary files differnew file mode 100644 index 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