.. 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 11 or later, APEX is tested with the OpenJDK Java) - Building from source: JAVA development kit (JDK, Java 11 or later, APEX is tested with the OpenJDK Java) - A web archive capable webserver, for instance for the monitoring application .. container:: ulist - for instance `Apache Tomcat `__ - 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 `__ - TAR and GZ to extract from that TAR.GZ distribution .. container:: ulist - Windows for instance `7Zip `__ - 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 `__ to connect APEX to a Kafka message bus - `Hazelcast `__ to use distributed hash maps for context - `Infinispan `__ for distributed context and persistence - `Docker `__ 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 `__. .. 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. .. 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 -Pdocker -DskipTests | >cd \dev\apex | | | >mvn clean install -Pdocker -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 . | | 03/09/2018 11:55 .. | | 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 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 classes | | 03/09/2018 11:54 dependency-maven-plugin-markers | | 03/09/2018 11:54 etc | | 03/09/2018 11:54 examples | | 03/09/2018 11:55 install_hierarchy | | 03/09/2018 11:54 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 ``dpkg`` from ``.deb`` archive - Windows, Unix, Cygwin: manually from a ``.tar.gz`` archive - Windows, Unix, Cygwin: build from source using Maven, then install manually Install with DPKG ################# .. container:: paragraph You can get the APEX debian package from the `ONAP Nexus Repository `__. 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. +--------------------------------------------------------------------------+ | 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 You can download a ``tar.gz`` archive from the `ONAP Nexus Repository `__. 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 You can download a ``tar.gz`` archive from the `ONAP Nexus Repository `__. Copy the ``tar.gz`` 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 You can download a ``tar.gz`` archive from the `ONAP Nexus Repository `__. Copy the ``tar.gz`` 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). .. 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 -Pdocker -DskipTests | >cd \dev\apex | | | >mvn clean install -Pdocker -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 . | | 03/09/2018 11:55 .. | | 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 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 classes | | 03/09/2018 11:54 dependency-maven-plugin-markers | | 03/09/2018 11:54 etc | | 03/09/2018 11:54 examples | | 03/09/2018 11:55 install_hierarchy | | 03/09/2018 11:54 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 ```` 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 .. 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 ```` .. container:: paragraph to .. container:: paragraph ```` .. container:: paragraph On Windows, it is recommended to change the log directory to: .. container:: paragraph ```` .. 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: | | | | | sudo mkdir -p /var/log/onap/policy/apex-pdp | >mkdir C:\apex\apex-full-2.0.0-SNAPSHOT\logs | | sudo 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/apexApps.sh engine``. On Windows start the engine using ``%APEX_HOME%\bin\apexApps.bat engine``. 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.(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 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 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:: paragraph On Unix/Linux flavoured platforms, give the commands below: .. container:: listingblock .. container:: content .. code:: :number-lines: sudo su - apexuser export APEX_HOME export APEX_USER apexuser .. container:: paragraph You can now try to run apex. .. container:: listingblock .. container:: content .. code:: :number-lines: # $APEX_HOME/bin/apexApps.sh engine -c $APEX_HOME/examples/config/SampleDomain/Stdin2StdoutJsonEventJava.json -m $APEX_HOME/examples/models/SampleDomain/SamplePolicyModelJAVA.json (1) >%APEX_HOME%\bin\apexApps.bat engine -c %APEX_HOME%\examples\config\SampleDomain\Stdin2StdoutJsonEventJava.json -m %APEX_HOME%\examples\models\SampleDomain\SamplePolicyModelJAVA.json :: (2) .. container:: colist arabic +-------+---------+ | **1** | UNIX | +-------+---------+ | **2** | Windows | +-------+---------+ .. container:: paragraph The engine should start successfully. Assuming the logging levels are set to ``info`` in the built system, 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 Client ######################################## .. container:: paragraph APEX has a REST application for deploying, monitoring, and viewing policy models. The application can also be used to create new policy models close to the engine native policy language. Start the REST client as follows. .. container:: listingblock .. container:: content .. code:: :number-lines: # $APEX_HOME/bin/apexApps.sh full-client .. container:: listingblock .. container:: content .. code:: :number-lines: >%APEX_HOME%\bin\apexApps.bat full-client .. container:: paragraph The script will start a simple web server (`Grizzly `__) and deploy a ``war`` web archive in it. Once the client 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 (ApexServicesRestMain: Config=[ApexServicesRestParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=READY) starting at http://localhost:18989/apexservices/ . . . Jul 02, 2020 2:57:39 PM org.glassfish.grizzly.http.server.NetworkListener start INFO: Started listener bound to [localhost:18989] Jul 02, 2020 2:57:39 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 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 client. Click on the "Policy Editor" button and the Policy Editor start screen should be as follows. .. container:: imageblock .. container:: content |Policy Editor Start Screen| .. container:: title Figure 1. Policy 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 |Policy Editor with loaded SampleDomain Policy Model| .. container:: title Figure 2. Policy Editor with loaded SampleDomain Policy Model .. container:: paragraph Now you can use the Policy editor. To finish this verification, simply terminate your browser (or the tab), and then use ``CTRL+C`` in the console where you started the Policy editor. Installing the WAR Application ------------------------------ .. container:: paragraph The three APEX clients are packaged in a WAR file. This is a complete application that can be installed and run in an application server. The application is realized as a servlet. You can find the WAR application in the `ONAP Nexus Repository `__. .. container:: paragraph Installing and using the WAR application requires a web server that can execute ``war`` web archives. We recommend to use `Apache Tomcat `__, however other web servers can be used as well. .. container:: paragraph Install Apache Tomcat including the ``Manager App``, see `V9.0 Docs `__ for details. Start the Tomcat service, or make sure that Tomcat is running. .. container:: paragraph There are multiple ways to install the APEX WAR application: .. 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 `__ or the `Manager App HOW-TO `__. 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 WAR application file has a name similar to *apex-client-full-.war*. 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) "executorParameters":{...}, (3) "contextParameters":{...} (4) "taskParameters":[...] (5) } }, "eventInputParameters":{ (6) "input1":{ (7) "carrierTechnologyParameters":{...}, "eventProtocolParameters":{...} }, "input2":{...}, (8) "carrierTechnologyParameters":{...}, "eventProtocolParameters":{...} }, ... (9) }, "eventOutputParameters":{ (10) "output1":{ (11) "carrierTechnologyParameters":{...}, "eventProtocolParameters":{...} }, "output2":{ (12) "carrierTechnologyParameters":{...}, "eventProtocolParameters":{...} }, ... (13) } } .. 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** | list of task parameters that | | | should be made available in task | | | logic (optional). | +-----------------------------------+-----------------------------------+ | **6** | configuration of the input | | | interface | +-----------------------------------+-----------------------------------+ | **7** | an example input called | | | ``input1`` with carrier | | | technology and event protocol | +-----------------------------------+-----------------------------------+ | **8** | an example input called | | | ``input2`` with carrier | | | technology and event protocol | +-----------------------------------+-----------------------------------+ | **9** | any further input configuration | +-----------------------------------+-----------------------------------+ | **10** | configuration of the output | | | interface | +-----------------------------------+-----------------------------------+ | **11** | an example output called | | | ``output1`` with carrier | | | technology and event protocol | +-----------------------------------+-----------------------------------+ | **12** | an example output called | | | ``output2`` with carrier | | | technology and event protocol | +-----------------------------------+-----------------------------------+ | **13** | 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", (6a) "policy_type_impl" : {...}, (6b) "periodicEventPeriod": 1000, (7) "engineParameters":{ (8) "executorParameters":{...}, (9) "contextParameters":{...}, (10) "taskParameters":[...] (11) } } .. 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 `_ | | | _. | | | 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 | +-----------------------------------+-----------------------------------+ | **6a** | the APEX policy model file to | | | load into the engine on startup | | | when APEX is running native | | | policies in standalone mode | | | (optional) | +-----------------------------------+-----------------------------------+ | **6b** | the APEX policy model as a JSON | | | or YAML block to load into the | | | engine on startup when | | | APEX is running a policy that has | | | its logic and parameters | | | specified in TOSCA | | | (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. | +-----------------------------------+-----------------------------------+ | **11** | list of task parameters that | | | should be made available in task | | | logic (optional). | +-----------------------------------+-----------------------------------+ .. 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 `__ (a `tutorial `__). 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 `__. .. 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 Configure Task Parameters ######################### .. container:: paragraph The Task Parameters are added to the configuration as follows: .. container:: listingblock .. container:: content .. code:: "engineServiceParameters": { "engineParameters": { "taskParameters": [ { "key": "ParameterKey1", "value": "ParameterValue1" }, { "taskId": "Task_Act0", "key": "ParameterKey2", "value": "ParameterValue2" } ] } } .. container:: paragraph TaskParameters can be used to pass parameters from ApexConfig to the policy logic. In the config, these are optional. The list of task parameters provided in the config may be added to the tasks or existing task parameters in the task will be overriden. .. container:: paragraph If taskId is provided in ApexConfig for an entry, then that parameter is updated only for that particular task. Otherwise, the task parameter is added to all tasks. 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 `__ - `Kafka Producer Class `__ 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 only works 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``. The httpCodeFilter is used for filtering the status code, and it can be configured as a regular expression string. The default httpCodeFilter is "[2][0-9][0-9]" - for successful response codes. The response with HTTP status code that matches the given regular expression is forwarded to the task, otherwise it is logged as a failure. .. 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) "httpMethod": "GET", (3) "httpCodeFilter" : "[2][0-9][0-9]", (4) "httpHeaders" : [ (5) ["Keep-Alive", "300"], ["Cache-Control", "no-cache"] ] } } .. container:: colist arabic +-------+--------------------------------------------------+ | **1** | set REST client as carrier technology | +-------+--------------------------------------------------+ | **2** | the URL of the HTTP server for events | +-------+--------------------------------------------------+ | **3** | the HTTP method to use (GET/PUT/POST/DELETE), | | | optional, defaults to GET | +-------+--------------------------------------------------+ | **4** | use HTTP CODE FILTER for filtering status code, | | | optional, defaults to [2][0-9][0-9] | +-------+--------------------------------------------------+ | **5** | HTTP headers to use on the REST request, | | | optional | +-------+--------------------------------------------------+ 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). The URL can be configured statically or tagged as ``?example.{site}.org:8080/{trig}/events``, all tags such as ``site`` and ``trig`` in the URL need to be set in the properties object available to the tasks. In addition, the keys should exactly match with the tags defined in url. The scope of the properties object is per HTTP call. Hence, key/value pairs set in the properties object by task are only available for that specific HTTP call. .. 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) "url" : "http://example.{site}.com:8888/{trig}/events", (2') "httpMethod" : "PUT". (3) "httpHeaders" : [ (4) ["Keep-Alive", "300"], ["Cache-Control", "no-cache"] ] } } .. container:: colist arabic +-------+--------------------------------------------------+ | **1** | set REST client as carrier technology | +-------+--------------------------------------------------+ | **2** | the static URL of the HTTP server for events | +-------+--------------------------------------------------+ | **2'**| the tagged URL of the HTTP server for events | +-------+--------------------------------------------------+ | **3** | the HTTP method to use (GET/PUT/POST/DELETE), | | | optional, defaults to POST | +-------+--------------------------------------------------+ | **4** | HTTP headers to use on the REST request, | | | optional | +-------+--------------------------------------------------+ 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 only works 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:: ... ... org.onap.policy.apex.plugins.event.carrier.restserver ... 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 only works with the JSON Event protocol. This plugin allows APEX to send REST requests and to receive the reply of that request without tying up APEX resources while the request is being processed. The REST Requestor pairs a REST requestor producer and consumer together to handle the REST request and response. The REST request is created from an APEX output event and the REST response is input into APEX as a new input event. REST Requestor Output (REST Request Producer) ============================================= .. container:: paragraph APEX sends a REST request when events are output by APEX, the REST request configuration is specified on the REST Request Consumer (see below). .. 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 The settings below are required on the producer to define the event that triggers the REST request and to specify the peered consumer configuration for the REST request, 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** | requestor mode must be set to *true* | +-------+-------------------------------------------+ | **3** | the peered consumer for REST requests, | | | that consumer specifies the full | | | configuration for REST requests | +-------+-------------------------------------------+ | **4** | the request timeout in milliseconds, | | | overridden by timeout on consumer if that | | | is set, optional defaults to 500 | | | millisconds | +-------+-------------------------------------------+ REST Requestor Input (REST Request Consumer) ============================================ .. container:: paragraph APEX will connect to a given URL to issue a REST request and wait for a REST response. The URL can be configured statically or tagged as ``?example.{site}.org:8080/{trig}/events``, all tags such as ``site`` and ``trig`` in the URL need to be set in the properties object available to the tasks. In addition, the keys should exactly match with the tags defined in url. The scope of the properties object is per HTTP call. Hence, key/value pairs set in the properties object by task are only available for that specific HTTP call. The httpCodeFilter is used for filtering the status code, and it can be configured as a regular expression string. The default httpCodeFilter is "[2][0-9][0-9]" - for successful response codes. The response with HTTP status code that matches the given regular expression is forwarded to the task, otherwise it is logged as a failure. .. 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) "url": "http://localhost:54321/{site}/path/to/rest/{resValue}", (2') "httpMethod": "POST", (3) "requestorMode": true, (4) "requestorPeer": "GuardRequestorProducer", (5) "restRequestTimeout": 2000, (6) "httpCodeFilter" : "[2][0-9][0-9]" (7) "httpHeaders" : [ (8) ["Keep-Alive", "300"], ["Cache-Control", "no-cache"] ] } }, .. container:: colist arabic +-------+--------------------------------------------------+ | **1** | set REST requestor as carrier technology | +-------+--------------------------------------------------+ | **2** | the static URL of the HTTP server for events | +-------+--------------------------------------------------+ | **2'**| the tagged URL of the HTTP server for events | +-------+--------------------------------------------------+ | **3** | the HTTP method to use (GET/PUT/POST/DELETE), | | | optional, defaults to GET | +-------+--------------------------------------------------+ | **4** | requestor mode must be set to *true* | +-------+--------------------------------------------------+ | **5** | the peered producer for REST requests, that | | | producer specifies the APEX output event that | | | triggers the REST request | +-------+--------------------------------------------------+ | **6** | request timeout in milliseconds, overrides any | | | value set in the REST Requestor Producer, | | | optional, defaults to 500 millisconds | +-------+--------------------------------------------------+ | **7** | use HTTP CODE FILTER for filtering status code | | | optional, defaults to [2][0-9][0-9] | +-------+--------------------------------------------------+ | **8** | HTTP headers to use on the REST request, | | | optional | +-------+--------------------------------------------------+ .. container:: paragraph Further settings may be required on the consumer to define the input event that is produced and forwarded into APEX, for example: .. container:: listingblock .. container:: content .. code:: "eventName": "GuardResponseEvent", (1) "eventNameFilter": "GuardResponseEvent" (2) .. container:: colist arabic +-------+---------------------------+ | **1** | the event name | +-------+---------------------------+ | **2** | a filter on the event | +-------+---------------------------+ gRPC IO ####### .. container:: paragraph APEX can send requests over gRPC at the output side, and get back response at the input side. This can be used to send requests to CDS over gRPC. The media type is ``application/json``, so this plugin only works with the JSON Event protocol. gRPC Output =========== .. container:: paragraph APEX will connect to a given host to send a request over gRPC. .. container:: listingblock .. container:: content .. code:: "carrierTechnologyParameters": { "carrierTechnology": "GRPC", (1) "parameterClassName": "org.onap.policy.apex.plugins.event.carrier.grpc.GrpcCarrierTechnologyParameters", "parameters": { "host": "cds-blueprints-processor-grpc", (2) "port": 9111, (2') "username": "ccsdkapps", (3) "password": ccsdkapps, (4) "timeout" : 10 (5) } }, .. container:: colist arabic +-------+--------------------------------------------------+ | **1** | set GRPC as carrier technology | +-------+--------------------------------------------------+ | **2** | the host to which request is sent | +-------+--------------------------------------------------+ | **2'**| the value for port | +-------+--------------------------------------------------+ | **3** | username required to initiate connection | +-------+--------------------------------------------------+ | **4** | password required to initiate connection | +-------+--------------------------------------------------+ | **5** | the timeout value for completing the request | +-------+--------------------------------------------------+ .. container:: paragraph Further settings are required on the producer to define the event that is requested, for example: .. container:: listingblock .. container:: content .. code:: "eventName": "GRPCRequestEvent", (1) "eventNameFilter": "GRPCRequestEvent", (2) "requestorMode": true, (3) "requestorPeer": "GRPCRequestConsumer", (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 | +-------+---------------------------+ gRPC Input ========== .. container:: paragraph APEX will connect to the host specified in the producer side, anad take in response back at the consumer side. .. container:: listingblock .. container:: content .. code:: "carrierTechnologyParameters": { "carrierTechnology": "GRPC", (1) "parameterClassName": "org.onap.policy.apex.plugins.event.carrier.grpc.GrpcCarrierTechnologyParameters" }, .. container:: colist arabic +-------+------------------------------------------+ | **1** | set GRPC 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": "GRPCResponseEvent", (1) "requestorMode": true, (2) "requestorPeer": "GRPCRequestProducer", (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 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 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 name of the apex model properties file to use -c,--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 name of a file that contains an input model for the editor -if,--ignore-failures true or false, ignore failures of commands in command files and continue executing the command file -l,--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 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 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 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 CLI Tosca Editor ------------------------- .. container:: paragraph As per the new Policy LifeCycle API, the policies are expected to be defined as ToscaServiceTemplate. The CLI Tosca Editor is an extended version of the APEX CLI Editor which can generate the policies in ToscaServiceTemplate way. .. container:: paragraph The APEX config file(.json), command file(.apex) and the tosca template skeleton(.json) file paths need to be passed as input arguments to the CLI Tosca Editor. Policy in ToscaServiceTemplate format is generated as the output. This can be used as the input to Policy API for creating policies. .. container:: paragraph On UNIX and Cygwin systems use: .. container:: ulist - ``apexCLIToscaEditor.sh`` - starts the CLI Tosca editor, all the arguments supported by the basic CLI Editor are supported in addition to the mandatory arguments needed to generate ToscaServiceTemplate. - ``apexApps.sh cli-tosca-editor`` - starts the CLI Tosca editor, all the arguments supported by the basic CLI Editor are supported in addition to the mandatory arguments needed to generate ToscaServiceTemplate. .. container:: paragraph On Windows systems use: .. container:: ulist - ``apexCLIToscaEditor.bat`` - starts the CLI Tosca editor, all the arguments supported by the basic CLI Editor are supported in addition to the mandatory arguments needed to generate ToscaServiceTemplate. - ``apexApps.bat cli-tosca-editor`` - starts the CLI Tosca editor, all the arguments supported by the basic CLI Editor are supported in addition to the mandatory arguments needed to generate ToscaServiceTemplate. .. container:: paragraph Summary of alternatives to start the APEX CLI Tosca Editor: +-----------------------------------------------------------------+--------------------------------------------------------------------+ | Unix, Cygwin | Windows | +=================================================================+====================================================================+ | .. container:: | .. container:: | | | | | .. container:: listingblock | .. container:: listingblock | | | | | .. container:: content | .. container:: content | | | | | .. code:: | .. code:: | | | | | # $APEX_HOME/bin/apexCLIToscaEditor.sh.sh [args] | > %APEX_HOME%\bin\apexCLIToscaEditor.bat [args] | | # $APEX_HOME/bin/apexApps.sh cli-tosca-editor [args]| > %APEX_HOME%\bin\apexApps.bat cli-tosca-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.tosca.ApexCliToscaEditorMain [options...] options -a,--model-props-file name of the apex model properties file to use -ac,--apex-config-file name of the file containing apex configuration details -c,--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 name of a file that contains an input model for the editor -if,--ignore-failures true or false, ignore failures of commands in command files and continue executing the command file -l,--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 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 -ot,--output-tosca-file name of a file that will contain the output ToscaServiceTemplate -t,--tosca-template-file name of the input file containing tosca template which needs to be updated with policy -wd,--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 .. container:: paragraph An example command to run the APEX CLI Tosca editor on windows machine is given below. .. container:: listingblock .. container:: content .. code:: %APEX_HOME%/\bin/\apexCLIToscaEditor.bat -c %APEX_HOME%\examples\PolicyModel.apex -ot %APEX_HOME%\examples\test.json -l %APEX_HOME%\examples\test.log -ac %APEX_HOME%\examples\RESTServerStandaloneJsonEvent.json -t %APEX_HOME%\examples\ToscaTemplate.json The APEX Client --------------- .. container:: paragraph The APEX Client combines the Policy 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 to use for the Apex Services REST calls -t,--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 and CLI 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] | [ []] Options -d - 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 `` 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 set the input policy model file -t,--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 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] | | # $APEX_HOME/bin/apexApps.sh ws-console [args] | > %APEX_HOME%\bin\apexApps.bat ws-console [args] | +------------------------------------------------------------+--------------------------------------------------------------+ .. container:: paragraph The arguments are the same for both applications: .. container:: ulist - ``-p`` defines the Websocket port to connect to (defaults to ``8887``) - ``-s`` defines the host on which a Websocket server is running (defaults to ``localhost``) .. container:: paragraph A discussion on how to use these two applications to build an APEX system is detailed HowTo-Websockets. APEX Logging ^^^^^^^^^^^^ Introduction to APEX Logging ---------------------------- .. container:: paragraph All APEX components make extensive use of logging using the logging façade `SLF4J `__ with the backend `Logback `__. Both are used off-the-shelve, so the standard documentation and configuration apply to APEX logging. For details on how to work with logback please see the `logback manual `__. .. container:: paragraph The APEX applications is the logback configuration file ``$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 ``logDir`` 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: Apex ...appenders ...loggers .. container:: paragraph The first appender defined is called ``STDOUT`` for logs to standard out. .. container:: listingblock .. container:: content .. code:: :number-lines: %d %contextName [%t] %level %logger{36} - %msg%n .. 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: .. container:: paragraph The second appender is called ``FILE``. It writes logs to a file ``apex.log``. .. container:: listingblock .. container:: content .. code:: :number-lines: ${logDir}/apex.log %d %-5relative [procId=${processId}] [%thread] %-5level %logger{26} - %msg %n %ex{full} .. 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: ${logDir}/apex_ctxt.log %d %-5relative [procId=${processId}] [%thread] %-5level %logger{26} - %msg %n %ex{full} .. 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: 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:: .. 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:: ... 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:: .. 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:: 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:: policy: %msg\n .. 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:: 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:: ${logDir}/apex.log ${logDir}/apex_%d{yyyy-MM-dd}.%i.log.gz 4 100MB %d %-5relative [procId=${processId}] [%thread] %-5level %logger{26} - %msg %ex{full} %n .. container:: paragraph A very similar configuration can be used for a rolling file appender logging APEX context. .. container:: listingblock .. container:: content .. code:: ${logDir}/apex_ctxt.log ${logDir}/apex_ctxt_%d{yyyy-MM-dd}.%i.log.gz 4 100MB %d %-5relative [procId=${processId}] [%thread] %-5level %logger{26} - %msg %ex{full} %n 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:: Apex %d %contextName [%t] %level %logger{36} - %msg%n ${logDir}/apex.log %d %-5relative [procId=${processId}] [%thread] %-5level%logger{26} - %msg %n %ex{full} policy: %msg\n 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:: Apex ${logDir}/apex.log %d %-5relative [procId=${processId}] [%thread] %-5level%logger{26} - %msg %n %ex{full} 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 `__. APEX does not support WAMP at the moment. Websocket in Java ----------------- .. container:: paragraph In Java, `JSR 356 `__ 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 `__ - `Websocket sending client example, using AWT `__ - `Websocket receiving client example (simple echo client) `__ .. container:: paragraph For Java EE, the native Websocket API is explained here: .. container:: ulist - `Oracle docs `__ - link: `An example `__ 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/apexApps.sh engine -c $APEX_HOME/examples/config/VPN/Ws2WsServerAvroContextJsonEvent.json .. container:: listingblock .. container:: content .. code:: :number-lines: #: %APEX_HOME%\bin\apexApps.bat engine -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' 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`` in Terminal 3 (or ``CTRL+C``) to terminate the console-client. .. container:: :name: footer .. container:: :name: footer-text