path: root/docs/apex/APEX-User-Manual.rst

.. This work is licensed under a Creative Commons Attribution 4.0 International License.
.. http://creativecommons.org/licenses/by/4.0


APEX User Manual
****************

.. contents::
    :depth: 3

Installation
^^^^^^^^^^^^

Requirements
------------

            .. container:: paragraph

               APEX is 100% written in Java and runs on any platform
               that supports a JVM, e.g. Windows, Unix, Cygwin. Some
               APEX applications (such as the monitoring application)
               come as web archives, they do require a war-capable web
               server installed.

Installation Requirements
#########################

               .. container:: ulist

                  -  Downloaded distribution: JAVA runtime environment
                     (JRE, Java 8 or later, APEX is tested with the
                     Oracle Java)

                  -  Building from source: JAVA development kit (JDK,
                     Java 8 or later, APEX is tested with the Oracle
                     Java)

                  -  A web archive capable webserver, for instance for
                     the monitoring application

                     .. container:: ulist

                        -  for instance `Apache
                           Tomcat <https://tomcat.apache.org/>`__

                  -  Sufficient rights to install APEX on the system

                  -  Installation tools depending on the installation
                     method used:

                     .. container:: ulist

                        -  ZIP to extract from a ZIP distribution

                           .. container:: ulist

                              -  Windows for instance
                                 `7Zip <http://www.7-zip.org/>`__

                        -  TAR and GZ to extract from that TAR.GZ
                           distribution

                           .. container:: ulist

                              -  Windows for instance
                                 `7Zip <http://www.7-zip.org/>`__

                        -  RPM to install from the RPM distribution

                           .. container:: ulist

                              -  Install: ``sudo apt-get install rpm``

                        -  DPKG to install from the DEB distribution

                           .. container:: ulist

                              -  Install: ``sudo apt-get install dpkg``

Feature Requirements
####################

               .. container:: paragraph

                  APEX supports a number of features that require extra
                  software being installed.

               .. container:: ulist

                  -  `Apache Kafka <https://kafka.apache.org/>`__ to
                     connect APEX to a Kafka message bus

                  -  `Hazelcast <https://hazelcast.com/>`__ to use
                     distributed hash maps for context

                  -  `Infinispan <http://infinispan.org/>`__ for
                     distributed context and persistence

                  -  `Docker <https://www.docker.com/>`__ to run APEX
                     inside a Docker container

Build (Install from Source) Requirements
########################################

               .. container:: paragraph

                  Installation from source requires a few development
                  tools

               .. container:: ulist

                  -  GIT to retrieve the source code

                  -  Java SDK, Java version 8 or later

                  -  Apache Maven 3 (the APEX build environment)

Get the APEX Source Code
------------------------

            .. container:: paragraph

               The first APEX source code was hosted on Github in
               January 2018. By the end of 2018, APEX was added as a
               project in the ONAP Policy Framework, released later in
               the ONAP Casablanca release.

            .. container:: paragraph

               The APEX source code is hosted in ONAP as project APEX.
               The current stable version is in the master branch.
               Simply clone the master branch from ONAP using HTTPS.

            .. container:: listingblock

               .. container:: content

                  .. code::
                     :number-lines:

                     git clone https://gerrit.onap.org/r/policy/apex-pdp

Build APEX
----------

   .. container:: paragraph

      The examples in this document assume that the APEX source
      repositories are cloned to:

   .. container:: ulist

      -  Unix, Cygwin: ``/usr/local/src/apex-pdp``

      -  Windows: ``C:\dev\apex-pdp``

      -  Cygwin: ``/cygdrive/c/dev/apex-pdp``

   .. important::
      A Build requires ONAP Nexus
      APEX has a dependency to ONAP parent projects. You might need to adjust your Maven M2 settings. The most current
      settings can be found in the ONAP oparent repo: `Settings <https://git.onap.org/oparent/plain/settings.xml>`__.

   .. important::
      A Build needs Space
      Building APEX requires approximately 2-3 GB of hard disc space, 1 GB for the actual build with full
      distribution and 1-2 GB for the downloaded dependencies

   .. important::
      A Build requires Internet (for first build)
      During the build, several (a lot) of Maven dependencies will be downloaded and stored in the configured local Maven
      repository. The first standard build (and any first specific build) requires Internet access to download those
      dependencies.

   .. important::
      Building RPM distributions
      RPM images are only build if the ``rpm`` package is installed (Unix). To install  ``rpm`` run ``sudo apt-get install rpm``,
      then build APEX.

   .. container:: paragraph

      Use Maven to for a standard build without any tests.

      +-------------------------------------------------------+--------------------------------------------------------+
      | Unix, Cygwin                                          | Windows                                                |
      +=======================================================+========================================================+
      | .. container::                                        | .. container::                                         |
      |                                                       |                                                        |
      |    .. container:: content                             |    .. container:: content                              |
      |                                                       |                                                        |
      |       .. code::                                       |       .. code::                                        |
      |         :number-lines:                                |         :number-lines:                                 |
      |                                                       |                                                        |
      |         # cd /usr/local/src/apex-pdp                  |          >c:                                           |
      |         # mvn clean install -DskipTest                |          >cd \dev\apex                                 |
      |                                                       |          >mvn clean install -DskipTests                |
      +-------------------------------------------------------+--------------------------------------------------------+

.. container:: paragraph

   The build takes 2-3 minutes on a standard development laptop. It
   should run through without errors, but with a lot of messages from
   the build process.

.. container:: paragraph

   When Maven is finished with the build, the final screen should look
   similar to this (omitting some ``success`` lines):

.. container:: listingblock

   .. container:: content

      .. code::
        :number-lines:

        [INFO] tools .............................................. SUCCESS [  0.248 s]
        [INFO] tools-common ....................................... SUCCESS [  0.784 s]
        [INFO] simple-wsclient .................................... SUCCESS [  3.303 s]
        [INFO] model-generator .................................... SUCCESS [  0.644 s]
        [INFO] packages ........................................... SUCCESS [  0.336 s]
        [INFO] apex-pdp-package-full .............................. SUCCESS [01:10 min]
        [INFO] Policy APEX PDP - Docker build 2.0.0-SNAPSHOT ...... SUCCESS [ 10.307 s]
        [INFO] ------------------------------------------------------------------------
        [INFO] BUILD SUCCESS
        [INFO] ------------------------------------------------------------------------
        [INFO] Total time: 03:43 min
        [INFO] Finished at: 2018-09-03T11:56:01+01:00
        [INFO] ------------------------------------------------------------------------

.. container:: paragraph

   The build will have created all artifacts required for an APEX
   installation. The following example show how to change to the target
   directory and how it should look like.

+----------------------------------------------------------------------------------------------------------------------------+
| Unix, Cygwin                                                                                                               |
+============================================================================================================================+
| .. container::                                                                                                             |
|                                                                                                                            |
|    .. container:: listingblock                                                                                             |
|                                                                                                                            |
|       .. container:: content                                                                                               |
|                                                                                                                            |
|          .. code::                                                                                                         |
|             :number-lines:                                                                                                 |
|                                                                                                                            |
|             -rwxrwx---+ 1 esvevan Domain Users       772 Sep  3 11:55 apex-pdp-package-full_2.0.0~SNAPSHOT_all.changes*    |
|             -rwxrwx---+ 1 esvevan Domain Users 146328082 Sep  3 11:55 apex-pdp-package-full-2.0.0-SNAPSHOT.deb*            |
|             -rwxrwx---+ 1 esvevan Domain Users     15633 Sep  3 11:54 apex-pdp-package-full-2.0.0-SNAPSHOT.jar*            |
|             -rwxrwx---+ 1 esvevan Domain Users 146296819 Sep  3 11:55 apex-pdp-package-full-2.0.0-SNAPSHOT-tarball.tar.gz* |
|             drwxrwx---+ 1 esvevan Domain Users         0 Sep  3 11:54 archive-tmp/                                         |
|             -rwxrwx---+ 1 esvevan Domain Users        89 Sep  3 11:54 checkstyle-cachefile*                                |
|             -rwxrwx---+ 1 esvevan Domain Users     10621 Sep  3 11:54 checkstyle-checker.xml*                              |
|             -rwxrwx---+ 1 esvevan Domain Users       584 Sep  3 11:54 checkstyle-header.txt*                               |
|             -rwxrwx---+ 1 esvevan Domain Users        86 Sep  3 11:54 checkstyle-result.xml*                               |
|             drwxrwx---+ 1 esvevan Domain Users         0 Sep  3 11:54 classes/                                             |
|             drwxrwx---+ 1 esvevan Domain Users         0 Sep  3 11:54 dependency-maven-plugin-markers/                     |
|             drwxrwx---+ 1 esvevan Domain Users         0 Sep  3 11:54 etc/                                                 |
|             drwxrwx---+ 1 esvevan Domain Users         0 Sep  3 11:54 examples/                                            |
|             drwxrwx---+ 1 esvevan Domain Users         0 Sep  3 11:55 install_hierarchy/                                   |
|             drwxrwx---+ 1 esvevan Domain Users         0 Sep  3 11:54 maven-archiver/                                      |
+----------------------------------------------------------------------------------------------------------------------------+

+--------------------------------------------------------------------------------------------------------+
| Windows                                                                                                |
+========================================================================================================+
| .. container::                                                                                         |
|                                                                                                        |
|    .. container:: listingblock                                                                         |
|                                                                                                        |
|       .. container:: content                                                                           |
|                                                                                                        |
|          .. code::                                                                                     |
|             :number-lines:                                                                             |
|                                                                                                        |
|                03/09/2018  11:55    <DIR>          .                                                   |
|                03/09/2018  11:55    <DIR>          ..                                                  |
|                03/09/2018  11:55       146,296,819 apex-pdp-package-full-2.0.0-SNAPSHOT-tarball.tar.gz |
|                03/09/2018  11:55       146,328,082 apex-pdp-package-full-2.0.0-SNAPSHOT.deb            |
|                03/09/2018  11:54            15,633 apex-pdp-package-full-2.0.0-SNAPSHOT.jar            |
|                03/09/2018  11:55               772 apex-pdp-package-full_2.0.0~SNAPSHOT_all.changes    |
|                03/09/2018  11:54    <DIR>          archive-tmp                                         |
|                03/09/2018  11:54                89 checkstyle-cachefile                                |
|                03/09/2018  11:54            10,621 checkstyle-checker.xml                              |
|                03/09/2018  11:54               584 checkstyle-header.txt                               |
|                03/09/2018  11:54                86 checkstyle-result.xml                               |
|                03/09/2018  11:54    <DIR>          classes                                             |
|                03/09/2018  11:54    <DIR>          dependency-maven-plugin-markers                     |
|                03/09/2018  11:54    <DIR>          etc                                                 |
|                03/09/2018  11:54    <DIR>          examples                                            |
|                03/09/2018  11:55    <DIR>          install_hierarchy                                   |
|                03/09/2018  11:54    <DIR>          maven-archiver                                      |
|                               8 File(s)    292,652,686 bytes                                           |
|                               9 Dir(s)  14,138,720,256 bytes free                                      |
+--------------------------------------------------------------------------------------------------------+

Install APEX
------------

   .. container:: paragraph

      APEX can be installed in different ways:

   .. container:: ulist

      -  Unix: automatically using ``rpm`` or ``dpkg`` from ``.rpm`` or
         ``.deb`` archive

      -  Windows, Unix, Cygwin: manually from a ``.tar.gz`` archive

      -  Windows, Unix, Cygwin: build from source using Maven, then
         install manually

Install with RPM and DPKG
#########################

      .. container:: paragraph

         The install distributions of APEX automatically install the
         system. The installation directory is
         ``/opt/app/policy/apex-pdp``. Log files are located in
         ``/var/log/onap/policy/apex-pdp``. The latest APEX version will
         be available as ``/opt/app/policy/apex-pdp/apex-pdp``.

      .. container:: paragraph

         For the installation, a new user ``apexuser`` and a new group
         ``apexuser`` will be created. This user owns the installation
         directories and the log file location. The user is also used by
         the standard APEX start scripts to run APEX with this user’s
         permissions.

         +-----------------------------------------------------------------------+
         | RPM Installation                                                      |
         +=======================================================================+
         | .. container::                                                        |
         |                                                                       |
         |    .. container:: listingblock                                        |
         |                                                                       |
         |       .. container:: content                                          |
         |                                                                       |
         |          .. code::                                                    |
         |             :number-lines:                                            |
         |                                                                       |
         |             # sudo rpm -i apex-pdp-package-full-2.0.0-SNAPSHOT.rpm    |
         |             ********************preinst*******************            |
         |             arguments 1                                               |
         |             **********************************************            |
         |             creating group apexuser . . .                             |
         |             creating user apexuser . . .                              |
         |             ********************postinst****************              |
         |             arguments 1                                               |
         |             ***********************************************           |
         +-----------------------------------------------------------------------+

+--------------------------------------------------------------------------------------+
| DPKG Installation                                                                    |
+======================================================================================+
| .. container::                                                                       |
|                                                                                      |
|    .. container:: listingblock                                                       |
|                                                                                      |
|       .. container:: content                                                         |
|                                                                                      |
|          .. code::                                                                   |
|             :number-lines:                                                           |
|                                                                                      |
|             # sudo dpkg -i apex-pdp-package-full-2.0.0-SNAPSHOT.deb                  |       
|             Selecting previously unselected package apex-uservice.                   |
|             (Reading database ... 288458 files and directories currently installed.) |
|             Preparing to unpack apex-pdp-package-full-2.0.0-SNAPSHOT.deb ...         |
|             ********************preinst*******************                           |
|             arguments install                                                        |
|             **********************************************                           |
|             creating group apexuser . . .                                            |
|             creating user apexuser . . .                                             |
|             Unpacking apex-uservice (2.0.0-SNAPSHOT) ...                             |
|             Setting up apex-uservice (2.0.0-SNAPSHOT) ...                            |
|             ********************postinst****************                             |
|             arguments configure                                                      |
|             ***********************************************                          |
+--------------------------------------------------------------------------------------+

.. container:: paragraph

   Once the installation is finished, APEX is fully installed and ready
   to run.

Install Manually from Archive (Unix, Cygwin)
############################################

   .. container:: paragraph

      Download a ``tar.gz`` archive. Create a directory where APEX
      should be installed. Extract the ``tar`` archive. The following
      example shows how to install APEX in ``/opt/apex`` and create a
      link to ``/opt/apex/apex`` for the most recent installation.

   .. container:: listingblock

      .. container:: content

         .. code::
            :number-lines:

            # cd /opt
            # mkdir apex
            # cd apex
            # mkdir apex-full-2.0.0-SNAPSHOT
            # tar xvfz ~/Downloads/apex-pdp-package-full-2.0.0-SNAPSHOT.tar.gz -C apex-full-2.0.0-SNAPSHOT
            # ln -s apex apex-pdp-package-full-2.0.0-SNAPSHOT

Install Manually from Archive (Windows, 7Zip, GUI)
##################################################

   .. container:: paragraph

      Download a ``tar.gz`` archive and copy the file into the install
      folder (in this example ``C:\apex``). Assuming you are using 7Zip,
      right click on the file and extract the ``tar`` archive. Note: the
      screenshots might show an older version than you have.

   .. container:: imageblock

      .. container:: content

         |Extract the TAR archive|

   .. container:: paragraph

      The right-click on the new created TAR file and extract the actual
      APEX distribution.

   .. container:: imageblock

      .. container:: content

         |Extract the APEX distribution|

   .. container:: paragraph

      Inside the new APEX folder you see the main directories: ``bin``,
      ``etc``, ``examples``, ``lib``, and ``war``

   .. container:: paragraph

      Once extracted, please rename the created folder to
      ``apex-full-2.0.0-SNAPSHOT``. This will keep the directory name in
      line with the rest of this documentation.

Install Manually from Archive (Windows, 7Zip, CMD)
##################################################

   .. container:: paragraph

      Download a ``tar.gz`` archive and copy the file into the install
      folder (in this example ``C:\apex``). Start ``cmd``, for instance
      typing ``Windows+R`` and then ``cmd`` in the dialog. Assuming
      ``7Zip`` is installed in the standard folder, simply run the
      following commands (for APEX version 2.0.0-SNAPSHOT full
      distribution)

   .. container:: listingblock

      .. container:: content

         .. code::
           :number-lines:

            >c:
            >cd \apex
            >"\Program Files\7-Zip\7z.exe" x apex-pdp-package-full-2.0.0-SNAPSHOT.tar.gz -so | "\Program Files\7-Zip\7z.exe" x -aoa -si -ttar -o"apex-full-2.0.0-SNAPSHOT"

.. container:: paragraph

   APEX is now installed in the folder
   ``C:\apex\apex-full-2.0.0-SNAPSHOT``.

Build from Source
-----------------

Build and Install Manually (Unix, Windows, Cygwin)
##################################################

      .. container:: paragraph

         Clone the APEX GIT repositories into a directory. Go to that
         directory. Use Maven to build APEX (all details on building
         APEX from source can be found in *APEX HowTo: Build*). Install
         from the created artifacts (``rpm``, ``deb``, ``tar.gz``, or
         copying manually).

      .. important::
         Building RPM distributions
         RPM images are only build if the ``rpm`` package is installed (Unix). To install ``rpm`` run
         ``sudo apt-get install rpm``, then build APEX.

      .. container:: paragraph

         The following example shows how to build the APEX system,
         without tests (``-DskipTests``) to safe some time. It assumes
         that the APX GIT repositories are cloned to:

      .. container:: ulist

         -  Unix, Cygwin: ``/usr/local/src/apex``

         -  Windows: ``C:\dev\apex``

         +-------------------------------------------------------+--------------------------------------------------------+
         | Unix, Cygwin                                          | Windows                                                |
         +=======================================================+========================================================+
         | .. container::                                        | .. container::                                         |
         |                                                       |                                                        |
         |    .. container:: content                             |    .. container:: content                              |
         |                                                       |                                                        |
         |       .. code::                                       |       .. code::                                        |
         |         :number-lines:                                |         :number-lines:                                 |
         |                                                       |                                                        |
         |         # cd /usr/local/src/apex                      |         >c:                                            |
         |         # mvn clean install -DskipTests               |         >cd \dev\apex                                  |
         |                                                       |         >mvn clean install -DskipTests                 |
         +-------------------------------------------------------+--------------------------------------------------------+

.. container:: paragraph

   The build takes about 2 minutes without test and about 4-5 minutes
   with tests on a standard development laptop. It should run through
   without errors, but with a lot of messages from the build process. If
   build with tests (i.e. without ``-DskipTests``), there will be error
   messages and stack trace prints from some tests. This is normal, as
   long as the build finishes successful.

.. container:: paragraph

   When Maven is finished with the build, the final screen should look
   similar to this (omitting some ``success`` lines):

.. container:: listingblock

   .. container:: content

      .. code::
         :number-lines:

         [INFO] tools .............................................. SUCCESS [  0.248 s]
         [INFO] tools-common ....................................... SUCCESS [  0.784 s]
         [INFO] simple-wsclient .................................... SUCCESS [  3.303 s]
         [INFO] model-generator .................................... SUCCESS [  0.644 s]
         [INFO] packages ........................................... SUCCESS [  0.336 s]
         [INFO] apex-pdp-package-full .............................. SUCCESS [01:10 min]
         [INFO] Policy APEX PDP - Docker build 2.0.0-SNAPSHOT ...... SUCCESS [ 10.307 s]
         [INFO] ------------------------------------------------------------------------
         [INFO] BUILD SUCCESS
         [INFO] ------------------------------------------------------------------------
         [INFO] Total time: 03:43 min
         [INFO] Finished at: 2018-09-03T11:56:01+01:00
         [INFO] ------------------------------------------------------------------------

.. container:: paragraph

   The build will have created all artifacts required for an APEX
   installation. The following example show how to change to the target
   directory and how it should look like.

+-----------------------------------------------------------------------------------------------------------------------------+
| Unix, Cygwin                                                                                                                |
+=============================================================================================================================+
| .. container::                                                                                                              |
|                                                                                                                             |
|    .. container:: listingblock                                                                                              |
|                                                                                                                             |
|          .. code::                                                                                                          |
|            :number-lines:                                                                                                   |
|                                                                                                                             |
|            # cd packages/apex-pdp-package-full/target                                                                       |
|            # ls -l                                                                                                          |
|            -rwxrwx---+ 1 esvevan Domain Users       772 Sep  3 11:55 apex-pdp-package-full_2.0.0~SNAPSHOT_all.changes*      |
|            -rwxrwx---+ 1 esvevan Domain Users 146328082 Sep  3 11:55 apex-pdp-package-full-2.0.0-SNAPSHOT.deb*              |
|            -rwxrwx---+ 1 esvevan Domain Users     15633 Sep  3 11:54 apex-pdp-package-full-2.0.0-SNAPSHOT.jar*              |
|            -rwxrwx---+ 1 esvevan Domain Users 146296819 Sep  3 11:55 apex-pdp-package-full-2.0.0-SNAPSHOT-tarball.tar.gz*   |
|            drwxrwx---+ 1 esvevan Domain Users         0 Sep  3 11:54 archive-tmp/                                           |
|            -rwxrwx---+ 1 esvevan Domain Users        89 Sep  3 11:54 checkstyle-cachefile*                                  |
|            -rwxrwx---+ 1 esvevan Domain Users     10621 Sep  3 11:54 checkstyle-checker.xml*                                |
|            -rwxrwx---+ 1 esvevan Domain Users       584 Sep  3 11:54 checkstyle-header.txt*                                 |
|            -rwxrwx---+ 1 esvevan Domain Users        86 Sep  3 11:54 checkstyle-result.xml*                                 |
|            drwxrwx---+ 1 esvevan Domain Users         0 Sep  3 11:54 classes/                                               |
|            drwxrwx---+ 1 esvevan Domain Users         0 Sep  3 11:54 dependency-maven-plugin-markers/                       |
|            drwxrwx---+ 1 esvevan Domain Users         0 Sep  3 11:54 etc/                                                   |
|            drwxrwx---+ 1 esvevan Domain Users         0 Sep  3 11:54 examples/                                              |
|            drwxrwx---+ 1 esvevan Domain Users         0 Sep  3 11:55 install_hierarchy/                                     |
|            drwxrwx---+ 1 esvevan Domain Users         0 Sep  3 11:54 maven-archiver/                                        |
+-----------------------------------------------------------------------------------------------------------------------------+

+-----------------------------------------------------------------------------------------------------------------------------+
| Windows                                                                                                                     |
+=============================================================================================================================+
| .. container::                                                                                                              |
|                                                                                                                             |
|    .. container:: listingblock                                                                                              |
|                                                                                                                             |
|          .. code::                                                                                                          |
|            :number-lines:                                                                                                   |
|                                                                                                                             |
|            >cd packages\apex-pdp-package-full\target                                                                        |
|            >dir                                                                                                             |
|            03/09/2018  11:55    <DIR>          .                                                                            |
|            03/09/2018  11:55    <DIR>          ..                                                                           |
|            03/09/2018  11:55       146,296,819 apex-pdp-package-full-2.0.0-SNAPSHOT-tarball.tar.gz                          |
|            03/09/2018  11:55       146,328,082 apex-pdp-package-full-2.0.0-SNAPSHOT.deb                                     |
|            03/09/2018  11:54            15,633 apex-pdp-package-full-2.0.0-SNAPSHOT.jar                                     |
|            03/09/2018  11:55               772 apex-pdp-package-full_2.0.0~SNAPSHOT_all.changes                             |
|            03/09/2018  11:54    <DIR>          archive-tmp                                                                  |
|            03/09/2018  11:54                89 checkstyle-cachefile                                                         |
|            03/09/2018  11:54            10,621 checkstyle-checker.xml                                                       |
|            03/09/2018  11:54               584 checkstyle-header.txt                                                        |
|            03/09/2018  11:54                86 checkstyle-result.xml                                                        |
|            03/09/2018  11:54    <DIR>          classes                                                                      |
|            03/09/2018  11:54    <DIR>          dependency-maven-plugin-markers                                              |
|            03/09/2018  11:54    <DIR>          etc                                                                          |
|            03/09/2018  11:54    <DIR>          examples                                                                     |
|            03/09/2018  11:55    <DIR>          install_hierarchy                                                            |
|            03/09/2018  11:54    <DIR>          maven-archiver                                                               |
|                           8 File(s)    292,652,686 bytes                                                                    |
|                           9 Dir(s)  14,138,720,256 bytes free                                                               |
+-----------------------------------------------------------------------------------------------------------------------------+

.. container:: paragraph

   Now, take the ``.deb`` or the ``.tar.gz`` file and install APEX.
   Alternatively, copy the content of the folder ``install_hierarchy``
   to your APEX directory.

Installation Layout
-------------------

   .. container:: paragraph

      A full installation of APEX comes with the following layout.

   .. container:: listingblock

      .. container:: content

         ::

            $APEX_HOME
                ├───bin             (1)
                ├───etc             (2)
                │   ├───editor
                │   ├───hazelcast
                │   ├───infinispan
                │   └───META-INF
                ├───examples            (3)
                │   ├───config          (4)
                │   ├───docker          (5)
                │   ├───events          (6)
                │   ├───html            (7)
                │   ├───models          (8)
                │   └───scripts         (9)
                ├───lib             (10)
                │   └───applications        (11)
                └───war             (12)

   .. container:: colist arabic

      +-----------------------------------+-----------------------------------+
      | **1**                             | binaries, mainly scripts (bash    |
      |                                   | and bat) to start the APEX engine |
      |                                   | and applications                  |
      +-----------------------------------+-----------------------------------+
      | **2**                             | configuration files, such as      |
      |                                   | logback (logging) and third party |
      |                                   | library configurations            |
      +-----------------------------------+-----------------------------------+
      | **3**                             | example policy models to get      |
      |                                   | started                           |
      +-----------------------------------+-----------------------------------+
      | **4**                             | configurations for the examples   |
      |                                   | (with sub directories for         |
      |                                   | individual examples)              |
      +-----------------------------------+-----------------------------------+
      | **5**                             | Docker files and additional       |
      |                                   | Docker instructions for the       |
      |                                   | exampples                         |
      +-----------------------------------+-----------------------------------+
      | **6**                             | example events for the examples   |
      |                                   | (with sub directories for         |
      |                                   | individual examples)              |
      +-----------------------------------+-----------------------------------+
      | **7**                             | HTML files for some examples,     |
      |                                   | e.g. the Decisionmaker example    |
      +-----------------------------------+-----------------------------------+
      | **8**                             | the policy models, generated for  |
      |                                   | each example (with sub            |
      |                                   | directories for individual        |
      |                                   | examples)                         |
      +-----------------------------------+-----------------------------------+
      | **9**                             | additional scripts for the        |
      |                                   | examples (with sub directories    |
      |                                   | for individual examples)          |
      +-----------------------------------+-----------------------------------+
      | **10**                            | the library folder with all Java  |
      |                                   | JAR files                         |
      +-----------------------------------+-----------------------------------+
      | **11**                            | applications, also known as jar   |
      |                                   | with dependencies (or fat jars),  |
      |                                   | individually deployable           |
      +-----------------------------------+-----------------------------------+
      | **12**                            | WAR files for web applications    |
      +-----------------------------------+-----------------------------------+

System Configuration
--------------------

   .. container:: paragraph

      Once APEX is installed, a few configurations need to be done:

   .. container:: ulist

      -  Create an APEX user and an APEX group (optional, if not
         installed using RPM and DPKG)

      -  Create environment settings for ``APEX_HOME`` and
         ``APEX_USER``, required by the start scripts

      -  Change settings of the logging framework (optional)

      -  Create directories for logging, required (execution might fail
         if directories do not exist or cannot be created)

APEX User and Group
###################

      .. container:: paragraph

         On smaller installations and test systems, APEX can run as any
         user or group.

      .. container:: paragraph

         However, if APEX is installed in production, we strongly
         recommend you set up a dedicated user for running APEX. This
         will isolate the execution of APEX to that user. We recommend
         you use the userid ``apexuser`` but you may use any user you
         choose.

      .. container:: paragraph

         The following example, for UNIX, creates a group called
         ``apexuser``, an APEX user called ``apexuser``, adds the group
         to the user, and changes ownership of the APEX installation to
         the user. Substitute ``<apex-dir>`` with the directory where
         APEX is installed.

         .. container:: listingblock

            .. container:: content

               .. code::
                  :number-lines:

                  # sudo groupadd apexuser
                  # sudo useradd -g apexuser apexuser
                  # sudo chown -R apexuser:apexuser <apex-dir>

.. container:: paragraph

   For other operating systems please consult your manual or system
   administrator.

Environment Settings: APEX_HOME and APEX_USER
#############################################

   .. container:: paragraph

      The provided start scripts for APEX require two environment
      variables being set:

   .. container:: ulist

      -  ``APEX_USER`` with the user under whos name and permission APEX
         should be started (Unix only)

      -  ``APEX_HOME`` with the directory where APEX is installed (Unix,
         Windows, Cygwin)

   .. container:: paragraph

      The first row in the following table shows how to set these
      environment variables temporary (assuming the user is
      ``apexuser``). The second row shows how to verify the settings.
      The last row explains how to set those variables permanently.

   +------------------------------------------------+---------------------------------------------------------+
   | Unix, Cygwin (bash/tcsh)                       | Windows                                                 |
   +================================================+=========================================================+
   | .. container::                                 | .. container::                                          |
   |                                                |                                                         |
   |    .. container:: content                      |    .. container:: content                               |
   |                                                |                                                         |
   |       .. code::                                |       .. code::                                         |
   |          :number-lines:                        |         :number-lines:                                  |
   |                                                |                                                         |
   |          # export APEX_USER=apexuser           |         >set APEX_HOME=C:\apex\apex-full-2.0.0-SNAPSHOT |
   |          # cd /opt/app/policy/apex-pdp         |                                                         |
   |          # export APEX_HOME=`pwd`              |                                                         |
   |                                                |                                                         |
   +------------------------------------------------+                                                         |
   | .. container::                                 |                                                         |
   |                                                |                                                         |
   |    .. container:: content                      |                                                         |
   |                                                |                                                         |
   |       .. code::tcsh                            |                                                         |
   |          :number-lines:                        |                                                         |
   |                                                |                                                         |
   |          # setenv APEX_USER apexuser           |                                                         |
   |          # cd /opt/app/policy/apex-pdp         |                                                         |
   |          # setenv APEX_HOME `pwd`              |                                                         |
   |                                                |                                                         |
   +------------------------------------------------+---------------------------------------------------------+
   | .. container::                                 | .. container::                                          |
   |                                                |                                                         |
   |    .. container:: content                      |    .. container:: content                               |
   |                                                |                                                         |
   |       .. code::                                |       .. code::                                         |
   |          :number-lines:                        |          :number-lines:                                 |
   |                                                |                                                         |
   |          # env | grep APEX                     |          >set APEX_HOME                                 |
   |          # APEX_USER=apexuser                  |          APEX_HOME=\apex\apex-full-2.0.0-SNAPSHOT       |
   |          # APEX_HOME=/opt/app/policy/apex-pdp  |                                                         |
   |                                                |                                                         |
   +------------------------------------------------+---------------------------------------------------------+

Making Environment Settings Permanent (Unix, Cygwin)
====================================================

   .. container:: paragraph

      For a per-user setting, edit the a user’s ``bash`` or ``tcsh``
      settings in ``~/.bashrc`` or ``~/.tcshrc``. For system-wide
      settings, edit ``/etc/profiles`` (requires permissions).

Making Environment Settings Permanent (Windows)
===============================================

   .. container:: paragraph

      On Windows 7 do

   .. container:: ulist

      -  Click on the **Start** Menu

      -  Right click on **Computer**

      -  Select **Properties**

   .. container:: paragraph

      On Windows 8/10 do

   .. container:: ulist

      -  Click on the **Start** Menu

      -  Select **System**

   .. container:: paragraph

      Then do the following

   .. container:: ulist

      -  Select **Advanced System Settings**

      -  On the **Advanced** tab, click the **Environment Variables**
         button

      -  Edit an existing variable, or create a new System variable:
         'Variable name'="APEX_HOME", 'Variable
         value'="C:\apex\apex-full-2.0.0-SNAPSHOT"

   .. container:: paragraph

      For the settings to take effect, an application needs to be
      restarted (e.g. any open ``cmd`` window).

Edit the APEX Logging Settings
##############################

   .. container:: paragraph

      Configure the APEX logging settings to your requirements, for
      instance:

   .. container:: ulist

      -  change the directory where logs are written to, or

      -  change the log levels

   .. container:: paragraph

      Edit the file ``$APEX_HOME/etc/logback.xml`` for any required
      changes. To change the log directory change the line

   .. container:: paragraph

      ``<property name="VAR_LOG" value="/var/log/onap/policy/apex-pdp/" />``

   .. container:: paragraph

      to

   .. container:: paragraph

      ``<property name="VAR_LOG" value="/PATH/TO/LOG/DIRECTORY/" />``

   .. container:: paragraph

      On Windows, it is recommended to change the log directory to:

   .. container:: paragraph

      ``<property name="VAR_LOG" value="C:/apex/apex-full-2.0.0-SNAPSHOT/logs" />``

   .. container:: paragraph

      Note: Be careful about when to use ``\`` vs. ``/`` as the path
      separator!

Create Directories for Logging
##############################

   .. container:: paragraph

      Make sure that the log directory exists. This is important when
      APEX was installed manually or when the log directory was changed
      in the settings (see above).

   +------------------------------------------------------------------+-------------------------------------------------------+
   | Unix, Cygwin                                                     | Windows                                               |
   +==================================================================+=======================================================+
   | .. container::                                                   | .. container::                                        |
   |                                                                  |                                                       |
   |    .. container:: content                                        |    .. container:: content                             |
   |                                                                  |                                                       |
   |       .. code::                                                  |       .. code::                                       |
   |         :number-lines:                                           |         :number-lines:                                |
   |                                                                  |                                                       |
   |         mkdir -p /var/log/onap/policy/apex-pdp                   |         >mkdir C:\apex\apex-full-2.0.0-SNAPSHOT\logs  |
   |         chown -R apexuser:apexuser /var/log/onap/policy/apex-pdp |                                                       |
   +------------------------------------------------------------------+-------------------------------------------------------+

Verify the APEX Installation
----------------------------

   .. container:: paragraph

      When APEX is installed and all settings are realized, the
      installation can be verified.

Verify Installation - run Engine
################################

      .. container:: paragraph

         A simple verification of an APEX installation can be done by
         simply starting the APEX engine without any configuration. On
         Unix (or Cygwin) start the engine using
         ``$APEX_HOME/bin/apexEngine.sh``. On Windows start the engine
         using ``%APEX_HOME%\bin\apexEngine.bat``. The engine will fail
         to fully start. However, if the output looks similar to the
         following line, the APEX installation is realized.

      .. container:: listingblock

         .. container:: content

            .. code::
               :number-lines:

               Starting Apex service with parameters [] . . .
               start of Apex service failed: Apex configuration file was not specified as an argument
               2018-09-03 13:11:33,914 Apex [main] ERROR o.o.p.a.service.engine.main.ApexMain - start of Apex service failed
               org.onap.policy.apex.model.basicmodel.concepts.ApexException: Apex configuration file was not specified as an argument
                       at org.onap.policy.apex.service.engine.main.ApexCommandLineArguments.validateReadableFile(ApexCommandLineArguments.java:267)
                       at org.onap.policy.apex.service.engine.main.ApexCommandLineArguments.validate(ApexCommandLineArguments.java:161)
                       at org.onap.policy.apex.service.engine.main.ApexMain.<init>(ApexMain.java:68)
                       at org.onap.policy.apex.service.engine.main.ApexMain.main(ApexMain.java:165)
               usage: org.onap.policy.apex.service.engine.main.ApexMain [options...]
               options
               -c,--config-file <CONFIG_FILE>the full path to the configuration file to use, the configuration file must be a Json file
                                             containing the Apex configuration parameters
               -h,--help                     outputs the usage of this command
               -m,--model-file <MODEL_FILE>  the full path to the model file to use, if set it overrides the model file set in the
                                             configuration file
               -v,--version                  outputs the version of Apex

Verify Installation - run an Example
####################################

   .. container:: paragraph

      A full APEX installation comes with several examples. Here, we can
      fully verify the installation by running one of the examples.

   .. container:: paragraph

      We use the example called *SampleDomain* and configure the engine
      to use standard in and standard out for events. Run the engine
      with the provided configuration. Note: Cygwin executes scripts as
      Unix scripts but runs Java as a Windows application, thus the
      configuration file must be given as a Windows path.

   .. container:: listingblock

      .. container:: content

         .. code::
                :number-lines:

             # $APEX_HOME/bin/apexEngine.sh -c $APEX_HOME/examples/config/SampleDomain/Stdin2StdoutJsonEventJava.json (1)
             # $APEX_HOME/bin/apexEngine.sh -c C:/apex/apex-full-2.0.0-SNAPSHOT/examples/config/SampleDomain/Stdin2StdoutJsonEventJava.json (2)
             >%APEX_HOME%\bin\apexEngine.bat -c %APEX_HOME%\examples\config\SampleDomain\Stdin2StdoutJsonEventJava.json :: (3)

.. container:: colist arabic

   +-------+---------+
   | **1** | UNIX    |
   +-------+---------+
   | **2** | Cygwin  |
   +-------+---------+
   | **3** | Windows |
   +-------+---------+

.. container:: paragraph

   The engine should start successfully. Assuming the logging levels are
   not change (default level is ``info``), the output should look
   similar to this (last few lines)

.. container:: listingblock

   .. container:: content

      .. code::
         :number-lines:

         Starting Apex service with parameters [-c, v:/dev/ericsson/apex/onap/apex-pdp/packages/apex-pdp-package-full/target/install_hierarchy/examples/config/SampleDomain/Stdin2StdoutJsonEventJava.json] . . .
         2018-09-05 15:16:42,800 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Created apex engine MyApexEngine-0:0.0.1 .
         2018-09-05 15:16:42,804 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Created apex engine MyApexEngine-1:0.0.1 .
         2018-09-05 15:16:42,804 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Created apex engine MyApexEngine-2:0.0.1 .
         2018-09-05 15:16:42,805 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Created apex engine MyApexEngine-3:0.0.1 .
         2018-09-05 15:16:42,805 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - APEX service created.
         2018-09-05 15:16:43,962 Apex [main] INFO o.o.p.a.s.e.e.EngDepMessagingService - engine<-->deployment messaging starting . . .
         2018-09-05 15:16:43,963 Apex [main] INFO o.o.p.a.s.e.e.EngDepMessagingService - engine<-->deployment messaging started
         2018-09-05 15:16:44,987 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Registering apex model on engine MyApexEngine-0:0.0.1
         2018-09-05 15:16:45,112 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Registering apex model on engine MyApexEngine-1:0.0.1
         2018-09-05 15:16:45,113 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Registering apex model on engine MyApexEngine-2:0.0.1
         2018-09-05 15:16:45,113 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Registering apex model on engine MyApexEngine-3:0.0.1
         2018-09-05 15:16:45,120 Apex [main] INFO o.o.p.a.s.e.r.impl.EngineServiceImpl - Added the action listener to the engine
         Started Apex service

.. container:: paragraph

   Important are the last two line, stating that APEX has added the
   final action listener to the engine and that the engine is started.

.. container:: paragraph

   The engine is configured to read events from standard input and write
   produced events to standard output. The policy model is a very simple
   policy.

.. container:: paragraph

   The following table shows an input event in the left column and an
   output event in the right column. Past the input event into the
   console where APEX is running, and the output event should appear in
   the console. Pasting the input event multiple times will produce
   output events with different values.

+-------------------------------------------------------------+-------------------------------------------------------------+
| Input Event                                                 | Example Output Event                                        |
+=============================================================+=============================================================+
| .. container::                                              | .. container::                                              |
|                                                             |                                                             |
|    .. container:: content                                   |    .. container:: content                                   |
|                                                             |                                                             |
|       .. code::                                             |       .. code::                                             |
|         :number-lines:                                      |         :number-lines:                                      |
|                                                             |                                                             |
|         {                                                   |         {                                                   |
|          "nameSpace": "org.onap.policy.apex.sample.events", |          "name": "Event0004",                               |
|          "name": "Event0000",                               |          "version": "0.0.1",                                |
|          "version": "0.0.1",                                |          "nameSpace": "org.onap.policy.apex.sample.events", |
|          "source": "test",                                  |          "source": "Act",                                   |
|          "target": "apex",                                  |          "target": "Outside",                               |
|          "TestSlogan": "Test slogan for External Event0",   |          "TestActCaseSelected": 2,                          |
|          "TestMatchCase": 0,                                |          "TestActStateTime": 1536157104627,                 |
|          "TestTimestamp": 1469781869269,                    |          "TestDecideCaseSelected": 0,                       |
|          "TestTemperature": 9080.866                        |          "TestDecideStateTime": 1536157104625,              |
|         }                                                   |          "TestEstablishCaseSelected": 0,                    |
|                                                             |          "TestEstablishStateTime": 1536157104623,           |
|                                                             |          "TestMatchCase": 0,                                |
|                                                             |          "TestMatchCaseSelected": 1,                        |
|                                                             |          "TestMatchStateTime": 1536157104620,               |
|                                                             |          "TestSlogan": "Test slogan for External Event0",   |
|                                                             |          "TestTemperature": 9080.866,                       |
|                                                             |          "TestTimestamp": 1469781869269                     |
|                                                             |          }                                                  |
+-------------------------------------------------------------+-------------------------------------------------------------+

.. container:: paragraph

   Terminate APEX by simply using ``CTRL+C`` in the console.

Verify a Full Installation - REST Editor
########################################

   .. container:: paragraph

      APEX has a REST application for viewing policy models. The
      application can also be used to create new policy models close to
      the engine native policy language. Start the REST editor as
      follows.

   .. container:: listingblock

      .. container:: content

         .. code::
            :number-lines:

            # $APEX_HOME/bin/apexApps.sh rest-editor

.. container:: listingblock

   .. container:: content

      .. code::
            :number-lines:

            >%APEX_HOME%\bin\apexApps.bat rest-editor

.. container:: paragraph

   The script will start a simple web server
   (`Grizzly <https://javaee.github.io/grizzly/>`__) and deploy a
   ``war`` web archive in it. Once the editor is started, it will be
   available on ``localhost:18989``. The last few line of the messages
   should be:

.. container:: listingblock

   .. container:: content

      .. code::
         :number-lines:

         Apex Editor REST endpoint (ApexEditorMain: Config=[ApexEditorParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=READY) starting at http://localhost:18989/apexservices/ . . .
         Sep 05, 2018 10:35:57 PM org.glassfish.grizzly.http.server.NetworkListener start
         INFO: Started listener bound to [localhost:18989]
         Sep 05, 2018 10:35:57 PM org.glassfish.grizzly.http.server.HttpServer start
         INFO: [HttpServer] Started.
         Apex Editor REST endpoint (ApexEditorMain: Config=[ApexEditorParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=RUNNING) started at http://localhost:18989/apexservices/

.. container:: paragraph

   Now open a browser (Firefox, Chrome, Opera, Internet Explorer) and
   use the URL ``http://localhost:18989/``. This will connect the
   browser to the started REST editor. The start screen should be as
   follows.

.. container:: imageblock

   .. container:: content

      |REST Editor Start Screen|

   .. container:: title

      Figure 1. REST Editor Start Screen

.. container:: paragraph

   Now load a policy model by clicking the menu ``File`` and then
   ``Open``. In the opened dialog, go to the directory where APEX is
   installed, then ``examples``, ``models``, ``SampleDomain``, and there
   select the file ``SamplePolicyModelJAVA.json``. This will load the
   policy model used to verify the policy engine (see above). Once
   loaded, the screen should look as follows.

.. container:: imageblock

   .. container:: content

      |REST Editor with loaded SampleDomain Policy Model|

   .. container:: title

      Figure 2. REST Editor with loaded SampleDomain Policy Model

.. container:: paragraph

   Now you can use the REST editor. To finish this verification, simply
   terminate your browser (or the tab), and then use ``CTRL+C`` in the
   console where you started the REST editor.

Installing WAR Applications
---------------------------

   .. container:: paragraph

      APEX comes with a set of WAR files. These are complete
      applications that can be installed and run in an application
      server. All of these applications are realized as servlets. You
      can find the WAR applications in ``$APEX_HOME/war`` (UNIX, Cygwin)
      or ``%APEX_HOME%\war`` (Windows).

   .. container:: paragraph

      Installing and using the WAR applications requires a web server
      that can execute ``war`` web archives. We recommend to use `Apache
      Tomcat <https://tomcat.apache.org/>`__, however other web servers
      can be used as well.

   .. container:: paragraph

      Install Apache Tomcat including the ``Manager App``, see `V9.0
      Docs <https://tomcat.apache.org/tomcat-9.0-doc/manager-howto.html#Configuring_Manager_Application_Access>`__
      for details. Start the Tomcat service, or make sure that Tomcat is
      running.

   .. container:: paragraph

      There are multiple ways to install the APEX WAR applications:

   .. container:: ulist

      -  copy the ``.war`` file into the Tomcat ``webapps`` folder

      -  use the Tomcat ``Manager App`` to deploy via the web interface

      -  deploy using a REST call to Tomcat

   .. container:: paragraph

      For details on how to install ``war`` files please consult the
      `Tomcat
      Documentation <https://tomcat.apache.org/tomcat-9.0-doc/index.html>`__
      or the `Manager App
      HOW-TO <https://tomcat.apache.org/tomcat-9.0-doc/manager-howto.html>`__.
      Once you installed an APEX WAR application (and wait for
      sufficient time for Tomcat to finalize the installation), open the
      ``Manager App`` in Tomcat. You should see the APEX WAR application
      being installed and running.

   .. container:: paragraph

      In case of errors, examine the log files in the Tomcat log
      directory. In a conventional install, those log files are in the
      logs directory where Tomcat is installed.

   .. container:: paragraph

      The current APEX version provides the following WAR applications:

   .. container:: ulist

      -  client-deployment-2.0.0-SNAPSHOT.war - a client to deploy new
         policy models to a running engine

      -  client-editor-2.0.0-SNAPSHOT.war - the standard policy REST
         editor GUI

      -  client-monitoring-2.0.0-SNAPSHOT.war - a client for monitoring
         a running APEX engine

      -  client-full-2.0.0-SNAPSHOT.war - a full client with a
         one-stop-access to deployment, monitoring, and REST editor

      -  examples-servlet-2.0.0-SNAPSHOT.war - an example APEX servlet

Running APEX in Docker
----------------------

   .. container:: paragraph

      Since APEX is in ONAP, we provide a full virtualization
      environment for the engine.

Run in ONAP
###########

      .. container:: paragraph

         Running APEX from the ONAP docker repository only requires 2
         commands:

      .. container:: olist arabic

         #. Log into the ONAP docker repo

      .. container:: listingblock

         .. container:: content

            ::

               docker login -u docker -p docker nexus3.onap.org:10003

      .. container:: olist arabic

         #. Run the APEX docker image

      .. container:: listingblock

         .. container:: content

            ::

               docker run -it --rm  nexus3.onap.org:10003/onap/policy-apex-pdp:latest

Build a Docker Image
####################

      .. container:: paragraph

         Alternatively, one can use the Dockerfile defined in the Docker
         package to build an image.

      .. container:: listingblock

         .. container:: title

            APEX Dockerfile

         .. container:: content

            .. code::
               :number-lines:

               #
               # Docker file to build an image that runs APEX on Java 8 in Ubuntu
               #
               FROM ubuntu:16.04

               RUN apt-get update && \
                       apt-get upgrade -y && \
                       apt-get install -y software-properties-common && \
                       add-apt-repository ppa:openjdk-r/ppa -y && \
                       apt-get update && \
                       apt-get install -y openjdk-8-jdk

               # Create apex user and group
               RUN groupadd apexuser
               RUN useradd --create-home -g apexuser apexuser

               # Add Apex-specific directories and set ownership as the Apex admin user
               RUN mkdir -p /opt/app/policy/apex-pdp
               RUN mkdir -p /var/log/onap/policy/apex-pdp
               RUN chown -R apexuser:apexuser /var/log/onap/policy/apex-pdp

               # Unpack the tarball
               RUN mkdir /packages
               COPY apex-pdp-package-full.tar.gz /packages
               RUN tar xvfz /packages/apex-pdp-package-full.tar.gz --directory /opt/app/policy/apex-pdp
               RUN rm /packages/apex-pdp-package-full.tar.gz

               # Ensure everything has the correct permissions
               RUN find /opt/app -type d -perm 755
               RUN find /opt/app -type f -perm 644
               RUN chmod a+x /opt/app/policy/apex-pdp/bin/*

               # Copy examples to Apex user area
               RUN cp -pr /opt/app/policy/apex-pdp/examples /home/apexuser

               RUN apt-get clean

               RUN chown -R apexuser:apexuser /home/apexuser/*

               USER apexuser
               ENV PATH /opt/app/policy/apex-pdp/bin:$PATH
               WORKDIR /home/apexuser

APEX Configurations Explained
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Introduction to APEX Configuration
----------------------------------

         .. container:: paragraph

            An APEX engine can be configured to use various combinations
            of event input handlers, event output handlers, event
            protocols, context handlers, and logic executors. The system
            is build using a plugin architecture. Each configuration
            option is realized by a plugin, which can be loaded and
            configured when the engine is started. New plugins can be
            added to the system at any time, though to benefit from a
            new plugin an engine will need to be restarted.

         .. container:: imageblock

            .. container:: content

               |APEX Configuration Matrix|

            .. container:: title

               Figure 3. APEX Configuration Matrix

         .. container:: paragraph

            The APEX distribution already comes with a number of
            plugins. The figure above shows the provided plugins. Any
            combination of input, output, event protocol, context
            handlers, and executors is possible.

General Configuration Format
----------------------------

         .. container:: paragraph

            The APEX configuration file is a JSON file containing a few
            main blocks for different parts of the configuration. Each
            block then holds the configuration details. The following
            code shows the main blocks:

         .. container:: listingblock

            .. container:: content

               .. code::

                  {
                    "engineServiceParameters":{
                      ... (1)
                      "engineParameters":{ (2)
                        "engineParameters":{...}, (3)
                        "contextParameters":{...} (4)
                      }
                    },
                    "eventInputParameters":{ (5)
                      "input1":{ (6)
                        "carrierTechnologyParameters":{...},
                        "eventProtocolParameters":{...}
                      },
                      "input2":{...}, (7)
                        "carrierTechnologyParameters":{...},
                        "eventProtocolParameters":{...}
                      },
                      ... (8)
                    },
                    "eventOutputParameters":{ (9)
                      "output1":{ (10)
                        "carrierTechnologyParameters":{...},
                        "eventProtocolParameters":{...}
                      },
                      "output2":{ (11)
                        "carrierTechnologyParameters":{...},
                        "eventProtocolParameters":{...}
                      },
                      ... (12)
                    }
                  }

         .. container:: colist arabic

            +-----------------------------------+-----------------------------------+
            | **1**                             | main engine configuration         |
            +-----------------------------------+-----------------------------------+
            | **2**                             | engine parameters for plugin      |
            |                                   | configurations (execution         |
            |                                   | environments and context          |
            |                                   | handling)                         |
            +-----------------------------------+-----------------------------------+
            | **3**                             | engine specific parameters,       |
            |                                   | mainly for executor plugins       |
            +-----------------------------------+-----------------------------------+
            | **4**                             | context specific parameters, e.g. |
            |                                   | for context schemas, persistence, |
            |                                   | etc.                              |
            +-----------------------------------+-----------------------------------+
            | **5**                             | configuration of the input        |
            |                                   | interface                         |
            +-----------------------------------+-----------------------------------+
            | **6**                             | an example input called           |
            |                                   | ``input1`` with carrier           |
            |                                   | technology and event protocol     |
            +-----------------------------------+-----------------------------------+
            | **7**                             | an example input called           |
            |                                   | ``input2`` with carrier           |
            |                                   | technology and event protocol     |
            +-----------------------------------+-----------------------------------+
            | **8**                             | any further input configuration   |
            +-----------------------------------+-----------------------------------+
            | **9**                             | configuration of the output       |
            |                                   | interface                         |
            +-----------------------------------+-----------------------------------+
            | **10**                            | an example output called          |
            |                                   | ``output1`` with carrier          |
            |                                   | technology and event protocol     |
            +-----------------------------------+-----------------------------------+
            | **11**                            | an example output called          |
            |                                   | ``output2`` with carrier          |
            |                                   | technology and event protocol     |
            +-----------------------------------+-----------------------------------+
            | **12**                            | any further output configuration  |
            +-----------------------------------+-----------------------------------+

Engine Service Parameters
-------------------------

         .. container:: paragraph

            The configuration provides a number of parameters to
            configure the engine. An example configuration with
            explanations of all options is shown below.

         .. container:: listingblock

            .. container:: content

               .. code::

                  "engineServiceParameters" : {
                    "name"          : "AADMApexEngine", (1)
                    "version"        : "0.0.1",  (2)
                    "id"             :  45,  (3)
                    "instanceCount"  : 4,  (4)
                    "deploymentPort" : 12345,  (5)
                    "policyModelFileName" : "examples/models/VPN/VPNPolicyModelJava.json", (6)
                    "periodicEventPeriod": 1000, (7)
                    "engineParameters":{ (8)
                      "engineParameters":{...}, (9)
                      "contextParameters":{...} (10)
                    }
                  }

         .. container:: colist arabic

            +-----------------------------------+-----------------------------------+
            | **1**                             | a name for the engine. The engine |
            |                                   | name is used to create a key in a |
            |                                   | runtime engine. An name matching  |
            |                                   | the following regular expression  |
            |                                   | can be used here:                 |
            |                                   | ``[A-Za-z0-9\\-_\\.]+``           |
            +-----------------------------------+-----------------------------------+
            | **2**                             | a version of the engine, use      |
            |                                   | semantic versioning as explained  |
            |                                   | here: `Semantic                   |
            |                                   | Versioning <http://semver.org/>`_ |
            |                                   | _.                                |
            |                                   | This version is used in a runtime |
            |                                   | engine to create a version of the |
            |                                   | engine. For that reason, the      |
            |                                   | version must match the following  |
            |                                   | regular expression ``[A-Z0-9.]+`` |
            +-----------------------------------+-----------------------------------+
            | **3**                             | a numeric identifier for the      |
            |                                   | engine                            |
            +-----------------------------------+-----------------------------------+
            | **4**                             | the number of threads (policy     |
            |                                   | instances executed in parallel)   |
            |                                   | the engine should use, use ``1``  |
            |                                   | for single threaded engines       |
            +-----------------------------------+-----------------------------------+
            | **5**                             | the port for the deployment       |
            |                                   | Websocket connection to the       |
            |                                   | engine                            |
            +-----------------------------------+-----------------------------------+
            | **6**                             | the model file to load into the   |
            |                                   | engine on startup (optional)      |
            +-----------------------------------+-----------------------------------+
            | **7**                             | an optional timer for periodic    |
            |                                   | policies, in milliseconds (a      |
            |                                   | defined periodic policy will be   |
            |                                   | executed every ``X``              |
            |                                   | milliseconds), not used of not    |
            |                                   | set or ``0``                      |
            +-----------------------------------+-----------------------------------+
            | **8**                             | engine parameters for plugin      |
            |                                   | configurations (execution         |
            |                                   | environments and context          |
            |                                   | handling)                         |
            +-----------------------------------+-----------------------------------+
            | **9**                             | engine specific parameters,       |
            |                                   | mainly for executor plugins       |
            +-----------------------------------+-----------------------------------+
            | **10**                            | context specific parameters, e.g. |
            |                                   | for context schemas, persistence, |
            |                                   | etc.                              |
            +-----------------------------------+-----------------------------------+

         .. container:: paragraph

            The model file is optional, it can also be specified via
            command line. In any case, make sure all execution and other
            required plug-ins for the loaded model are loaded as
            required.

Input and Output Interfaces
---------------------------

         .. container:: paragraph

            An APEX engine has two main interfaces:

         .. container:: ulist

            -  An *input* interface to receive events: also known as
               ingress interface or consumer, receiving (consuming)
               events commonly named triggers, and

            -  An *output* interface to publish produced events: also
               known as egress interface or producer, sending
               (publishing) events commonly named actions or action
               events.

         .. container:: paragraph

            The input and output interface is configured in terms of
            inputs and outputs, respectively. Each input and output is a
            combination of a carrier technology and an event protocol.
            Carrier technologies and event protocols are provided by
            plugins, each with its own specific configuration. Most
            carrier technologies can be configured for input as well as
            output. Most event protocols can be used for all carrier
            technologies. One exception is the JMS object event
            protocol, which can only be used for the JMS carrier
            technology. Some further restrictions apply (for instance
            for carrier technologies using bi- or uni-directional
            modes).

         .. container:: paragraph

            Input and output interface can be configured separately, in
            isolation, with any number of carrier technologies. The
            resulting general configuration options are:

         .. container:: ulist

            -  Input interface with one or more inputs

               .. container:: ulist

                  -  each input with a carrier technology and an event
                     protocol

                  -  some inputs with optional synchronous mode

                  -  some event protocols with additional parameters

            -  Output interface with one or more outputs

               .. container:: ulist

                  -  each output with a carrier technology and an event
                     encoding

                  -  some outputs with optional synchronous mode

                  -  some event protocols with additional parameters

         .. container:: paragraph

            The configuration for input and output is contained in
            ``eventInputParameters`` and ``eventOutputParameters``,
            respectively. Inside here, one can configure any number of
            inputs and outputs. Each of them needs to have a unique
            identifier (name), the content of the name is free form. The
            example below shows a configuration for two inputs and two
            outputs.

         .. container:: listingblock

            .. container:: content

               .. code::

                  "eventInputParameters": { (1)
                    "FirstConsumer": { (2)
                      "carrierTechnologyParameters" : {...}, (3)
                      "eventProtocolParameters":{...}, (4)
                      ... (5)
                    },
                    "SecondConsumer": { (6)
                      "carrierTechnologyParameters" : {...}, (7)
                      "eventProtocolParameters":{...}, (8)
                      ... (9)
                    },
                  },
                  "eventOutputParameters": { (10)
                    "FirstProducer": { (11)
                      "carrierTechnologyParameters":{...}, (12)
                      "eventProtocolParameters":{...}, (13)
                      ... (14)
                    },
                    "SecondProducer": { (15)
                      "carrierTechnologyParameters":{...}, (16)
                      "eventProtocolParameters":{...}, (17)
                      ... (18)
                    }
                  }

         .. container:: colist arabic

            +--------+--------------------------------------------------------------------+
            | **1**  | input interface configuration, APEX input plugins                  |
            +--------+--------------------------------------------------------------------+
            | **2**  | first input called ``FirstConsumer``                               |
            +--------+--------------------------------------------------------------------+
            | **3**  | carrier technology for plugin                                      |
            +--------+--------------------------------------------------------------------+
            | **4**  | event protocol for plugin                                          |
            +--------+--------------------------------------------------------------------+
            | **5**  | any other input configuration (e.g. event name filter, see below)  |
            +--------+--------------------------------------------------------------------+
            | **6**  | second input called ``SecondConsumer``                             |
            +--------+--------------------------------------------------------------------+
            | **7**  | carrier technology for plugin                                      |
            +--------+--------------------------------------------------------------------+
            | **8**  | event protocol for plugin                                          |
            +--------+--------------------------------------------------------------------+
            | **9**  | any other plugin configuration                                     |
            +--------+--------------------------------------------------------------------+
            | **10** | output interface configuration, APEX output plugins                |
            +--------+--------------------------------------------------------------------+
            | **11** | first output called ``FirstProducer``                              |
            +--------+--------------------------------------------------------------------+
            | **12** | carrier technology for plugin                                      |
            +--------+--------------------------------------------------------------------+
            | **13** | event protocol for plugin                                          |
            +--------+--------------------------------------------------------------------+
            | **14** | any other plugin configuration                                     |
            +--------+--------------------------------------------------------------------+
            | **15** | second output called ``SecondProducer``                            |
            +--------+--------------------------------------------------------------------+
            | **16** | carrier technology for plugin                                      |
            +--------+--------------------------------------------------------------------+
            | **17** | event protocol for plugin                                          |
            +--------+--------------------------------------------------------------------+
            | **18** | any other output configuration (e.g. event name filter, see below) |
            +--------+--------------------------------------------------------------------+

Event Filters
#############

            .. container:: paragraph

               APEX will always send an event after a policy execution
               is finished. For a successful execution, the event sent
               is the output event created by the policy. In case the
               policy does not create an output event, APEX will create
               a new event with all input event fields plus an
               additional field ``exceptionMessage`` with an exception
               message.

            .. container:: paragraph

               There are situations in which this auto-generated error
               event might not be required or wanted:

            .. container:: ulist

               -  when a policy failing should not result in an event
                  send out via an output interface

               -  when the auto-generated event goes back in an APEX
                  engine (or the same APEX engine), this can create
                  endless loops

               -  the auto-generated event should go to a special output
                  interface or channel

            .. container:: paragraph

               All of these situations are supported by a filter option
               using a wildecard (regular expression) configuration on
               APEX I/O interfaces. The parameter is called
               ``eventNameFilter`` and the value are `Java regular
               expressions <https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html>`__
               (a
               `tutorial <http://www.vogella.com/tutorials/JavaRegularExpressions/article.html>`__).
               The following code shows some examples:

            .. container:: listingblock

               .. container:: content

                  .. code::

                     "eventInputParameters": {
                       "Input1": {
                         "carrierTechnologyParameters" : {...},
                         "eventProtocolParameters":{...},
                         "eventNameFilter" : "^E[Vv][Ee][Nn][Tt][0-9]004$" (1)
                       }
                     },
                     "eventOutputParameters": {
                       "Output1": {
                         "carrierTechnologyParameters":{...},
                         "eventProtocolParameters":{...},
                         "eventNameFilter" : "^E[Vv][Ee][Nn][Tt][0-9]104$" (2)
                       }
                     }

Executors
---------

         .. container:: paragraph

            Executors are plugins that realize the execution of logic
            contained in a policy model. Logic can be in a task
            selector, a task, and a state finalizer. Using plugins for
            execution environments makes APEX very flexible to support
            virtually any executable logic expressions.

         .. container:: paragraph

            APEX 2.0.0-SNAPSHOT supports the following executors:

         .. container:: ulist

            -  Java, for Java implemented logic

               .. container:: ulist

                  -  This executor requires logic implemented using the
                     APEX Java interfaces.

                  -  Generated JAR files must be in the classpath of the
                     APEX engine at start time.

            -  Javascript

            -  JRuby,

            -  Jython,

            -  MVEL

               .. container:: ulist

                  -  This executor uses the latest version of the MVEL
                     engine, which can be very hard to debug and can
                     produce unwanted side effects during execution

Configure the Javascript Executor
#################################

            .. container:: paragraph

               The Javascript executor is added to the configuration as
               follows:

            .. container:: listingblock

               .. container:: content

                  .. code::

                     "engineServiceParameters":{
                       "engineParameters":{
                         "executorParameters":{
                           "JAVASCRIPT":{
                             "parameterClassName" :
                             "org.onap.policy.apex.plugins.executor.javascript.JavascriptExecutorParameters"
                           }
                         }
                       }
                     }

Configure the Jython Executor
#############################

            .. container:: paragraph

               The Jython executor is added to the configuration as
               follows:

            .. container:: listingblock

               .. container:: content

                  .. code::

                     "engineServiceParameters":{
                       "engineParameters":{
                         "executorParameters":{
                           "JYTHON":{
                             "parameterClassName" :
                             "org.onap.policy.apex.plugins.executor.jython.JythonExecutorParameters"
                           }
                         }
                       }
                     }

Configure the JRuby Executor
############################

            .. container:: paragraph

               The JRuby executor is added to the configuration as
               follows:

            .. container:: listingblock

               .. container:: content

                  .. code::

                     "engineServiceParameters":{
                       "engineParameters":{
                         "executorParameters":{
                           "JRUBY":{
                             "parameterClassName" :
                             "org.onap.policy.apex.plugins.executor.jruby.JrubyExecutorParameters"
                           }
                         }
                       }
                     }

Configure the Java Executor
###########################

            .. container:: paragraph

               The Java executor is added to the configuration as
               follows:

            .. container:: listingblock

               .. container:: content

                  .. code::

                     "engineServiceParameters":{
                       "engineParameters":{
                         "executorParameters":{
                           "JAVA":{
                             "parameterClassName" :
                             "org.onap.policy.apex.plugins.executor.java.JavaExecutorParameters"
                           }
                         }
                       }
                     }

Configure the MVEL Executor
###########################

            .. container:: paragraph

               The MVEL executor is added to the configuration as
               follows:

            .. container:: listingblock

               .. container:: content

                  .. code::

                     "engineServiceParameters":{
                       "engineParameters":{
                         "executorParameters":{
                           "MVEL":{
                             "parameterClassName" :
                             "org.onap.policy.apex.plugins.executor.mvel.MVELExecutorParameters"
                           }
                         }
                       }
                     }

Context Handlers
----------------

         .. container:: paragraph

            Context handlers are responsible for all context processing.
            There are the following main areas:

         .. container:: ulist

            -  Context schema: use schema handlers other than Java class
               (supported by default without configuration)

            -  Context distribution: distribute context across multiple
               APEX engines

            -  Context locking: mechanisms to lock context elements for
               read/write

            -  Context persistence: mechanisms to persist context

         .. container:: paragraph

            APEX provides plugins for each of the main areas.

Configure AVRO Schema Handler
#############################

            .. container:: paragraph

               The AVRO schema handler is added to the configuration as
               follows:

            .. container:: listingblock

               .. container:: content

                  .. code::

                     "engineServiceParameters":{
                       "engineParameters":{
                         "contextParameters":{
                           "parameterClassName" : "org.onap.policy.apex.context.parameters.ContextParameters",
                           "schemaParameters":{
                             "Avro":{
                               "parameterClassName" :
                                 "org.onap.policy.apex.plugins.context.schema.avro.AvroSchemaHelperParameters"
                             }
                           }
                         }
                       }
                     }

            .. container:: paragraph

               Using the AVRO schema handler has one limitation: AVRO
               only supports field names that represent valid Java class
               names. This means only letters and the character ``_``
               are supported. Characters commonly used in field names,
               such as ``.`` and ``-``, are not supported by AVRO. for
               more information see `Avro Spec:
               Names <https://avro.apache.org/docs/1.8.1/spec.html#names>`__.

            .. container:: paragraph

               To work with this limitation, the APEX Avro plugin will
               parse a given AVRO definition and replace *all*
               occurrences of ``.`` and ``-`` with a ``_``. This means
               that

            .. container:: ulist

               -  In a policy model, if the AVRO schema defined a field
                  as ``my-name`` the policy logic should access it as
                  ``my_name``

               -  In a policy model, if the AVRO schema defined a field
                  as ``my.name`` the policy logic should access it as
                  ``my_name``

               -  There should be no field names that convert to the
                  same internal name

                  .. container:: ulist

                     -  For instance the simultaneous use of
                        ``my_name``, ``my.name``, and ``my-name`` should
                        be avoided

                     -  If not avoided, the event processing might
                        create unwanted side effects

               -  If field names use any other not-supported character,
                  the AVRO plugin will reject it

                  .. container:: ulist

                     -  Since AVRO uses lazy initialization, this
                        rejection might only become visible at runtime

Carrier Technologies
--------------------

         .. container:: paragraph

            Carrier technologies define how APEX receives (input) and
            sends (output) events. They can be used in any combination,
            using asynchronous or synchronous mode. There can also be
            any number of carrier technologies for the input (consume)
            and the output (produce) interface.

         .. container:: paragraph

            Supported *input* technologies are:

         .. container:: ulist

            -  Standard input, read events from the standard input
               (console), not suitable for APEX background servers

            -  File input, read events from a file

            -  Kafka, read events from a Kafka system

            -  Websockets, read events from a Websocket

            -  JMS,

            -  REST (synchronous and asynchronous), additionally as
               client or server

            -  Event Requestor, allows reading of events that have been
               looped back into APEX

         .. container:: paragraph

            Supported *output* technologies are:

         .. container:: ulist

            -  Standard output, write events to the standard output
               (console), not suitable for APEX background servers

            -  File output, write events to a file

            -  Kafka, write events to a Kafka system

            -  Websockets, write events to a Websocket

            -  JMS

            -  REST (synchronous and asynchronous), additionally as
               client or server

            -  Event Requestor, allows events to be looped back into
               APEX

         .. container:: paragraph

            New carrier technologies can be added as plugins to APEX or
            developed outside APEX and added to an APEX deployment.

Standard IO
###########

            .. container:: paragraph

               Standard IO does not require a specific plugin, it is
               supported be default.

Standard Input
==============
               .. container:: paragraph

                  APEX will take events from its standard input. This
                  carrier is good for testing, but certainly not for a
                  use case where APEX runs as a server. The
                  configuration is as follows:

               .. container:: listingblock

                  .. container:: content

                     ::

                        "carrierTechnologyParameters" : {
                          "carrierTechnology" : "FILE", (1)
                          "parameters" : {
                            "standardIO" : true (2)
                          }
                        }

               .. container:: colist arabic

                  +-------+---------------------------------------+
                  | **1** | standard input is considered a file   |
                  +-------+---------------------------------------+
                  | **2** | file descriptor set to standard input |
                  +-------+---------------------------------------+

Standard Output
===============

               .. container:: paragraph

                  APEX will send events to its standard output. This
                  carrier is good for testing, but certainly not for a
                  use case where APEX runs as a server. The
                  configuration is as follows:

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "carrierTechnologyParameters" : {
                          "carrierTechnology" : "FILE", (1)
                          "parameters" : {
                            "standardIO" : true  (2)
                          }
                        }

               .. container:: colist arabic

                  +-------+----------------------------------------+
                  | **1** | standard output is considered a file   |
                  +-------+----------------------------------------+
                  | **2** | file descriptor set to standard output |
                  +-------+----------------------------------------+

2.7.2. File IO
##############

            .. container:: paragraph

               File IO does not require a specific plugin, it is
               supported be default.

File Input
==========

               .. container:: paragraph

                  APEX will take events from a file. The same file
                  should not be used as an output. The configuration is
                  as follows:

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "carrierTechnologyParameters" : {
                          "carrierTechnology" : "FILE", (1)
                          "parameters" : {
                            "fileName" : "examples/events/SampleDomain/EventsIn.xmlfile" (2)
                          }
                        }

               .. container:: colist arabic

                  +-------+------------------------------------------+
                  | **1** | set file input                           |
                  +-------+------------------------------------------+
                  | **2** | the name of the file to read events from |
                  +-------+------------------------------------------+

File Output
===========
               .. container:: paragraph

                  APEX will write events to a file. The same file should
                  not be used as an input. The configuration is as
                  follows:

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "carrierTechnologyParameters" : {
                          "carrierTechnology" : "FILE", (1)
                          "parameters" : {
                            "fileName"  : "examples/events/SampleDomain/EventsOut.xmlfile" (2)
                          }
                        }

               .. container:: colist arabic

                  +-------+-----------------------------------------+
                  | **1** | set file output                         |
                  +-------+-----------------------------------------+
                  | **2** | the name of the file to write events to |
                  +-------+-----------------------------------------+

Event Requestor IO
##################

            .. container:: paragraph

               Event Requestor IO does not require a specific plugin, it
               is supported be default. It should only be used with the
               APEX event protocol.

Event Requestor Input
=====================

               .. container:: paragraph

                  APEX will take events from APEX.

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "carrierTechnologyParameters" : {
                          "carrierTechnology": "EVENT_REQUESTOR" (1)
                        }

               .. container:: colist arabic

                  +-------+---------------------------+
                  | **1** | set event requestor input |
                  +-------+---------------------------+

Event Requestor Output
======================

               .. container:: paragraph

                  APEX will write events to APEX.

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "carrierTechnologyParameters" : {
                          "carrierTechnology": "EVENT_REQUESTOR" (1)
                        }

Peering Event Requestors
========================

               .. container:: paragraph

                  When using event requestors, they need to be peered.
                  This means an event requestor output needs to be
                  peered (associated) with an event requestor input. The
                  following example shows the use of an event requestor
                  with the APEX event protocol and the peering of output
                  and input.

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "eventInputParameters": {
                          "EventRequestorConsumer": {
                            "carrierTechnologyParameters": {
                              "carrierTechnology": "EVENT_REQUESTOR" (1)
                            },
                            "eventProtocolParameters": {
                              "eventProtocol": "APEX" (2)
                            },
                            "eventNameFilter": "InputEvent", (3)
                            "requestorMode": true, (4)
                            "requestorPeer": "EventRequestorProducer", (5)
                            "requestorTimeout": 500 (6)
                          }
                        },
                        "eventOutputParameters": {
                          "EventRequestorProducer": {
                            "carrierTechnologyParameters": {
                              "carrierTechnology": "EVENT_REQUESTOR" (7)
                            },
                            "eventProtocolParameters": {
                              "eventProtocol": "APEX" (8)
                            },
                            "eventNameFilter": "EventListEvent", (9)
                            "requestorMode": true, (10)
                            "requestorPeer": "EventRequestorConsumer", (11)
                            "requestorTimeout": 500 (12)
                          }
                        }

               .. container:: colist arabic

                  +-----------------------------------+-----------------------------------+
                  | **1**                             | event requestor on a consumer     |
                  +-----------------------------------+-----------------------------------+
                  | **2**                             | with APEX event protocol          |
                  +-----------------------------------+-----------------------------------+
                  | **3**                             | optional filter (best to use a    |
                  |                                   | filter to prevent unwanted events |
                  |                                   | on the consumer side)             |
                  +-----------------------------------+-----------------------------------+
                  | **4**                             | activate requestor mode           |
                  +-----------------------------------+-----------------------------------+
                  | **5**                             | the peer to the output (must      |
                  |                                   | match the output carrier)         |
                  +-----------------------------------+-----------------------------------+
                  | **6**                             | an optional timeout in            |
                  |                                   | milliseconds                      |
                  +-----------------------------------+-----------------------------------+
                  | **7**                             | event requestor on a producer     |
                  +-----------------------------------+-----------------------------------+
                  | **8**                             | with APEX event protocol          |
                  +-----------------------------------+-----------------------------------+
                  | **9**                             | optional filter (best to use a    |
                  |                                   | filter to prevent unwanted events |
                  |                                   | on the consumer side)             |
                  +-----------------------------------+-----------------------------------+
                  | **10**                            | activate requestor mode           |
                  +-----------------------------------+-----------------------------------+
                  | **11**                            | the peer to the output (must      |
                  |                                   | match the input carrier)          |
                  +-----------------------------------+-----------------------------------+
                  | **12**                            | an optional timeout in            |
                  |                                   | milliseconds                      |
                  +-----------------------------------+-----------------------------------+

Kafka IO
########

            .. container:: paragraph

               Kafka IO is supported by the APEX Kafka plugin. The
               configurations below are examples. APEX will take any
               configuration inside the parameter object and forward it
               to Kafka. More information on Kafka specific
               configuration parameters can be found in the Kafka
               documentation:

            .. container:: ulist

               -  `Kafka Consumer
                  Class <https://kafka.apache.org/090/javadoc/org/apache/kafka/clients/consumer/KafkaConsumer.html>`__

               -  `Kafka Producer
                  Class <https://kafka.apache.org/090/javadoc/org/apache/kafka/clients/producer/KafkaProducer.html>`__

Kafka Input
===========
               .. container:: paragraph

                  APEX will receive events from the Apache Kafka
                  messaging system. The input is uni-directional, an
                  engine will only receive events from the input but not
                  send any event to the input.

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "carrierTechnologyParameters" : {
                          "carrierTechnology" : "KAFKA", (1)
                          "parameterClassName" :
                            "org.onap.policy.apex.plugins.event.carrier.kafka.KAFKACarrierTechnologyParameters",
                          "parameters" : {
                            "bootstrapServers"  : "localhost:49092", (2)
                            "groupId"           : "apex-group-id", (3)
                            "enableAutoCommit"  : true, (4)
                            "autoCommitTime"    : 1000, (5)
                            "sessionTimeout"    : 30000, (6)
                            "consumerPollTime"  : 100, (7)
                            "consumerTopicList" : ["apex-in-0", "apex-in-1"], (8)
                            "keyDeserializer"   :
                                "org.apache.kafka.common.serialization.StringDeserializer", (9)
                            "valueDeserializer" :
                                "org.apache.kafka.common.serialization.StringDeserializer" (10)
                          }
                        }

               .. container:: colist arabic

                  +--------+-------------------------------------+
                  | **1**  | set Kafka as carrier technology     |
                  +--------+-------------------------------------+
                  | **2**  | bootstrap server and port           |
                  +--------+-------------------------------------+
                  | **3**  | a group identifier                  |
                  +--------+-------------------------------------+
                  | **4**  | flag for auto-commit                |
                  +--------+-------------------------------------+
                  | **5**  | auto-commit timeout in milliseconds |
                  +--------+-------------------------------------+
                  | **6**  | session timeout in milliseconds     |
                  +--------+-------------------------------------+
                  | **7**  | consumer poll time in milliseconds  |
                  +--------+-------------------------------------+
                  | **8**  | consumer topic list                 |
                  +--------+-------------------------------------+
                  | **9**  | key for the Kafka de-serializer     |
                  +--------+-------------------------------------+
                  | **10** | value for the Kafka de-serializer   |
                  +--------+-------------------------------------+

Kafka Output
============
               .. container:: paragraph

                  APEX will send events to the Apache Kafka messaging
                  system. The output is uni-directional, an engine will
                  send events to the output but not receive any event
                  from the output.

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "carrierTechnologyParameters" : {
                          "carrierTechnology" : "KAFKA", (1)
                          "parameterClassName" :
                            "org.onap.policy.apex.plugins.event.carrier.kafka.KAFKACarrierTechnologyParameters",
                          "parameters" : {
                            "bootstrapServers"  : "localhost:49092", (2)
                            "acks"              : "all", (3)
                            "retries"           : 0, (4)
                            "batchSize"         : 16384, (5)
                            "lingerTime"        : 1, (6)
                            "bufferMemory"      : 33554432, (7)
                            "producerTopic"     : "apex-out", (8)
                            "keySerializer"     :
                                "org.apache.kafka.common.serialization.StringSerializer", (9)
                            "valueSerializer"   :
                                "org.apache.kafka.common.serialization.StringSerializer" (10)
                          }
                        }

               .. container:: colist arabic

                  +--------+---------------------------------+
                  | **1**  | set Kafka as carrier technology |
                  +--------+---------------------------------+
                  | **2**  | bootstrap server and port       |
                  +--------+---------------------------------+
                  | **3**  | acknowledgement strategy        |
                  +--------+---------------------------------+
                  | **4**  | number of retries               |
                  +--------+---------------------------------+
                  | **5**  | batch size                      |
                  +--------+---------------------------------+
                  | **6**  | time to linger in milliseconds  |
                  +--------+---------------------------------+
                  | **7**  | buffer memory in byte           |
                  +--------+---------------------------------+
                  | **8**  | producer topic                  |
                  +--------+---------------------------------+
                  | **9**  | key for the Kafka serializer    |
                  +--------+---------------------------------+
                  | **10** | value for the Kafka serializer  |
                  +--------+---------------------------------+

JMS IO
#######

            .. container:: paragraph

               APEX supports the Java Messaging Service (JMS) as input
               as well as output. JMS IO is supported by the APEX JMS
               plugin. Input and output support an event encoding as
               text (JSON string) or object (serialized object). The
               input configuration is the same for both encodings, the
               output configuration differs.

JMS Input
=========
               .. container:: paragraph

                  APEX will receive events from a JMS messaging system.
                  The input is uni-directional, an engine will only
                  receive events from the input but not send any event
                  to the input.

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "carrierTechnologyParameters" : {
                          "carrierTechnology" : "JMS", (1)
                          "parameterClassName" :
                              "org.onap.policy.apex.plugins.event.carrier.jms.JMSCarrierTechnologyParameters",
                          "parameters" : { (2)
                            "initialContextFactory" :
                                "org.jboss.naming.remote.client.InitialContextFactory", (3)
                            "connectionFactory" : "ConnectionFactory", (4)
                            "providerURL" : "remote://localhost:5445", (5)
                            "securityPrincipal" : "guest", (6)
                            "securityCredentials" : "IAmAGuest", (7)
                            "consumerTopic" : "jms/topic/apexIn" (8)
                          }
                        }

               .. container:: colist arabic

                  +-----------------------------------+-----------------------------------+
                  | **1**                             | set JMS as carrier technology     |
                  +-----------------------------------+-----------------------------------+
                  | **2**                             | set all JMS specific parameters   |
                  +-----------------------------------+-----------------------------------+
                  | **3**                             | the context factory, in this case |
                  |                                   | from JBOSS (it requires the       |
                  |                                   | dependency                        |
                  |                                   | org.jboss:jboss-remote-naming:2.0 |
                  |                                   | .4.Final                          |
                  |                                   | or a different version to be in   |
                  |                                   | the directory ``$APEX_HOME/lib``  |
                  |                                   | or ``%APEX_HOME%\lib``            |
                  +-----------------------------------+-----------------------------------+
                  | **4**                             | a connection factory for the JMS  |
                  |                                   | connection                        |
                  +-----------------------------------+-----------------------------------+
                  | **5**                             | URL with host and port of the JMS |
                  |                                   | provider                          |
                  +-----------------------------------+-----------------------------------+
                  | **6**                             | access credentials, user name     |
                  +-----------------------------------+-----------------------------------+
                  | **7**                             | access credentials, user password |
                  +-----------------------------------+-----------------------------------+
                  | **8**                             | the JMS topic to listen to        |
                  +-----------------------------------+-----------------------------------+

JMS Output with Text
====================

               .. container:: paragraph

                  APEX engine send events to a JMS messaging system. The
                  output is uni-directional, an engine will send events
                  to the output but not receive any event from output.

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "carrierTechnologyParameters" : {
                          "carrierTechnology" : "JMS", (1)
                          "parameterClassName" :
                              "org.onap.policy.apex.plugins.event.carrier.jms.JMSCarrierTechnologyParameters",
                          "parameters" : { (2)
                            "initialContextFactory" :
                                "org.jboss.naming.remote.client.InitialContextFactory", (3)
                            "connectionFactory" : "ConnectionFactory", (4)
                            "providerURL" : "remote://localhost:5445", (5)
                            "securityPrincipal" : "guest", (6)
                            "securityCredentials" : "IAmAGuest", (7)
                            "producerTopic" : "jms/topic/apexOut", (8)
                            "objectMessageSending": "false" (9)
                          }
                        }

               .. container:: colist arabic

                  +-----------------------------------+-----------------------------------+
                  | **1**                             | set JMS as carrier technology     |
                  +-----------------------------------+-----------------------------------+
                  | **2**                             | set all JMS specific parameters   |
                  +-----------------------------------+-----------------------------------+
                  | **3**                             | the context factory, in this case |
                  |                                   | from JBOSS (it requires the       |
                  |                                   | dependency                        |
                  |                                   | org.jboss:jboss-remote-naming:2.0 |
                  |                                   | .4.Final                          |
                  |                                   | or a different version to be in   |
                  |                                   | the directory ``$APEX_HOME/lib``  |
                  |                                   | or ``%APEX_HOME%\lib``            |
                  +-----------------------------------+-----------------------------------+
                  | **4**                             | a connection factory for the JMS  |
                  |                                   | connection                        |
                  +-----------------------------------+-----------------------------------+
                  | **5**                             | URL with host and port of the JMS |
                  |                                   | provider                          |
                  +-----------------------------------+-----------------------------------+
                  | **6**                             | access credentials, user name     |
                  +-----------------------------------+-----------------------------------+
                  | **7**                             | access credentials, user password |
                  +-----------------------------------+-----------------------------------+
                  | **8**                             | the JMS topic to write to         |
                  +-----------------------------------+-----------------------------------+
                  | **9**                             | set object messaging to ``false`` |
                  |                                   | means it sends JSON text          |
                  +-----------------------------------+-----------------------------------+

JMS Output with Object
======================

               .. container:: paragraph

                  To configure APEX for JMS objects on the output
                  interface use the same configuration as above (for
                  output). Simply change the ``objectMessageSending``
                  parameter to ``true``.

Websocket (WS) IO
########################

            .. container:: paragraph

               APEX supports the Websockets as input as well as output.
               WS IO is supported by the APEX Websocket plugin. This
               carrier technology does only support uni-directional
               communication. APEX will not send events to a Websocket
               input and any event sent to a Websocket output will
               result in an error log.

            .. container:: paragraph

               The input can be configured as client (APEX connects to
               an existing Websocket server) or server (APEX starts a
               Websocket server). The same applies to the output. Input
               and output can both use a client or a server
               configuration, or separate configurations (input as
               client and output as server, input as server and output
               as client). Each configuration should use its own
               dedicated port to avoid any communication loops. The
               configuration of a Websocket client is the same for input
               and output. The configuration of a Websocket server is
               the same for input and output.

Websocket Client
================

               .. container:: paragraph

                  APEX will connect to a given Websocket server. As
                  input, it will receive events from the server but not
                  send any events. As output, it will send events to the
                  server and any event received from the server will
                  result in an error log.

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "carrierTechnologyParameters" : {
                          "carrierTechnology" : "WEBSOCKET", (1)
                          "parameterClassName" :
                          "org.onap.policy.apex.plugins.event.carrier.websocket.WEBSOCKETCarrierTechnologyParameters",
                          "parameters" : {
                            "host" : "localhost", (2)
                            "port" : 42451 (3)
                          }
                        }

               .. container:: colist arabic

                  +-------+------------------------------------------------------+
                  | **1** | set Websocket as carrier technology                  |
                  +-------+------------------------------------------------------+
                  | **2** | the host name on which a Websocket server is running |
                  +-------+------------------------------------------------------+
                  | **3** | the port of that Websocket server                    |
                  +-------+------------------------------------------------------+

Websocket Server
================

               .. container:: paragraph

                  APEX will start a Websocket server, which will accept
                  any Websocket clients to connect. As input, it will
                  receive events from the server but not send any
                  events. As output, it will send events to the server
                  and any event received from the server will result in
                  an error log.

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "carrierTechnologyParameters" : {
                          "carrierTechnology" : "WEBSOCKET", (1)
                          "parameterClassName" :
                          "org.onap.policy.apex.plugins.event.carrier.websocket.WEBSOCKETCarrierTechnologyParameters",
                          "parameters" : {
                            "wsClient" : false, (2)
                            "port"     : 42450 (3)
                          }
                        }

               .. container:: colist arabic

                  +-------+------------------------------------------------------------+
                  | **1** | set Websocket as carrier technology                        |
                  +-------+------------------------------------------------------------+
                  | **2** | disable client, so that APEX will start a Websocket server |
                  +-------+------------------------------------------------------------+
                  | **3** | the port for the Websocket server APEX will start          |
                  +-------+------------------------------------------------------------+

REST Client IO
##############

            .. container:: paragraph

               APEX can act as REST client on the input as well as on
               the output interface. The media type is
               ``application/json``, so this plugin does only work with
               the JSON Event protocol.

REST Client Input
=================

               .. container:: paragraph

                  APEX will connect to a given URL to receive events,
                  but not send any events. The server is polled, i.e.
                  APEX will do an HTTP GET, take the result, and then do
                  the next GET. Any required timing needs to be handled
                  by the server configured via the URL. For instance,
                  the server could support a wait timeout via the URL as
                  ``?timeout=100ms``.

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "carrierTechnologyParameters" : {
                          "carrierTechnology" : "RESTCLIENT", (1)
                          "parameterClassName" :
                            "org.onap.policy.apex.plugins.event.carrier.restclient.RESTClientCarrierTechnologyParameters",
                          "parameters" : {
                            "url" : "http://example.org:8080/triggers/events", (2)
                          }
                        }

               .. container:: colist arabic

                  +-------+---------------------------------------+
                  | **1** | set REST client as carrier technology |
                  +-------+---------------------------------------+
                  | **2** | the URL of the HTTP server for events |
                  +-------+---------------------------------------+

REST Client Output
==================

               .. container:: paragraph

                  APEX will connect to a given URL to send events, but
                  not receive any events. The default HTTP operation is
                  POST (no configuration required). To change it to PUT
                  simply add the configuration parameter (as shown in
                  the example below).

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "carrierTechnologyParameters" : {
                          "carrierTechnology" : "RESTCLIENT", (1)
                          "parameterClassName" :
                            "org.onap.policy.apex.plugins.event.carrier.restclient.RESTClientCarrierTechnologyParameters",
                          "parameters" : {
                            "url" : "http://example.com:8888/actions/events", (2)
                            "httpMethod" : "PUT" (3)
                          }
                        }

               .. container:: colist arabic

                  +-------+--------------------------------------------------+
                  | **1** | set REST client as carrier technology            |
                  +-------+--------------------------------------------------+
                  | **2** | the URL of the HTTP server for events            |
                  +-------+--------------------------------------------------+
                  | **3** | use HTTP PUT (remove this line to use HTTP POST) |
                  +-------+--------------------------------------------------+

REST Server IO
##############

            .. container:: paragraph

               APEX supports a REST server for input and output.

            .. container:: paragraph

               The REST server plugin always uses a synchronous mode. A
               client does a HTTP GET on the APEX REST server with the
               input event and receives the generated output event in
               the server reply. This means that for the REST server
               there has to always to be an input with an associated
               output. Input or output only are not permitted.

            .. container:: paragraph

               The plugin will start a Grizzly server as REST server for
               a normal APEX engine. If the APEX engine is executed as a
               servlet, for instance inside Tomcat, then Tomcat will be
               used as REST server (this case requires configuration on
               Tomcat as well).

            .. container:: paragraph

               Some configuration restrictions apply for all scenarios:

            .. container:: ulist

               -  Minimum port: 1024

               -  Maximum port: 65535

               -  The media type is ``application/json``, so this plugin
                  does only work with the JSON Event protocol.

            .. container:: paragraph

               The URL the client calls is created using

            .. container:: ulist

               -  the configured host and port, e.g.
                  ``http://localhost:12345``

               -  the standard path, e.g. ``/apex/``

               -  the name of the input/output, e.g. ``FirstConsumer/``

               -  the input or output name, e.g. ``EventIn``.

            .. container:: paragraph

               The examples above lead to the URL
               ``http://localhost:12345/apex/FirstConsumer/EventIn``.

            .. container:: paragraph

               A client can also get status information of the REST
               server using ``/Status``, e.g.
               ``http://localhost:12345/apex/FirstConsumer/Status``.

REST Server Stand-alone
=======================

               .. container:: paragraph

                  We need to configure a REST server input and a REST
                  server output. Input and output are associated with
                  each other via there name.

               .. container:: paragraph

                  Timeouts for REST calls need to be set carefully. If
                  they are too short, the call might timeout before a
                  policy finished creating an event.

               .. container:: paragraph

                  The following example configures the input named as
                  ``MyConsumer`` and associates an output named
                  ``MyProducer`` with it.

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "eventInputParameters": {
                          "MyConsumer": {
                            "carrierTechnologyParameters" : {
                              "carrierTechnology" : "RESTSERVER", (1)
                              "parameterClassName" :
                                "org.onap.policy.apex.plugins.event.carrier.restserver.RESTServerCarrierTechnologyParameters",
                              "parameters" : {
                                "standalone" : true, (2)
                                "host" : "localhost", (3)
                                "port" : 12345 (4)
                              }
                            },
                            "eventProtocolParameters":{
                              "eventProtocol" : "JSON" (5)
                            },
                            "synchronousMode"    : true, (6)
                            "synchronousPeer"    : "MyProducer", (7)
                            "synchronousTimeout" : 500 (8)
                          }
                        }

               .. container:: colist arabic

                  +-------+---------------------------------------+
                  | **1** | set REST server as carrier technology |
                  +-------+---------------------------------------+
                  | **2** | set the server as stand-alone         |
                  +-------+---------------------------------------+
                  | **3** | set the server host                   |
                  +-------+---------------------------------------+
                  | **4** | set the server listen port            |
                  +-------+---------------------------------------+
                  | **5** | use JSON event protocol               |
                  +-------+---------------------------------------+
                  | **6** | activate synchronous mode             |
                  +-------+---------------------------------------+
                  | **7** | associate an output ``MyProducer``    |
                  +-------+---------------------------------------+
                  | **8** | set a timeout of 500 milliseconds     |
                  +-------+---------------------------------------+

               .. container:: paragraph

                  The following example configures the output named as
                  ``MyProducer`` and associates the input ``MyConsumer``
                  with it. Note that for the output there are no more
                  paramters (such as host or port), since they are
                  already configured in the associated input

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "eventOutputParameters": {
                          "MyProducer": {
                            "carrierTechnologyParameters":{
                              "carrierTechnology" : "RESTSERVER",
                              "parameterClassName" :
                                "org.onap.policy.apex.plugins.event.carrier.restserver.RESTServerCarrierTechnologyParameters"
                            },
                            "eventProtocolParameters":{
                              "eventProtocol" : "JSON"
                            },
                            "synchronousMode"    : true,
                            "synchronousPeer"    : "MyConsumer",
                            "synchronousTimeout" : 500
                          }
                        }

REST Server Stand-alone, multi input
====================================

               .. container:: paragraph

                  Any number of input/output pairs for REST servers can
                  be configured. For instance, we can configure an input
                  ``FirstConsumer`` with output ``FirstProducer`` and an
                  input ``SecondConsumer`` with output
                  ``SecondProducer``. Important is that there is always
                  one pair of input/output.

REST Server Stand-alone in Servlet
==================================

               .. container:: paragraph

                  If APEX is executed as a servlet, e.g. inside Tomcat,
                  the configuration becomes easier since the plugin can
                  now use Tomcat as the REST server. In this scenario,
                  there are not parameters (port, host, etc.) and the
                  key ``standalone`` must not be used (or set to false).

               .. container:: paragraph

                  For the Tomcat configuration, we need to add the REST
                  server plugin, e.g.

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        <servlet>
                          ...
                          <init-param>
                            ...
                            <param-value>org.onap.policy.apex.plugins.event.carrier.restserver</param-value>
                          </init-param>
                          ...
                        </servlet>

REST Requestor IO
##################

            .. container:: paragraph

               APEX can act as REST requestor on the input as well as on
               the output interface. The media type is
               ``application/json``, so this plugin does only work with
               the JSON Event protocol.

REST Requestor Input
====================

               .. container:: paragraph

                  APEX will connect to a given URL to request an input.

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "carrierTechnologyParameters": {
                          "carrierTechnology": "RESTREQUESTOR", (1)
                          "parameterClassName": "org.onap.policy.apex.plugins.event.carrier.restrequestor.RESTRequestorCarrierTechnologyParameters",
                          "parameters": {
                            "url": "http://localhost:54321/some/path/to/rest/resource", (2)
                            "httpMethod": "POST", (3)
                            "restRequestTimeout": 2000 (4)
                          }
                        },

               .. container:: colist arabic

                  +-------+--------------------------------------------------+
                  | **1** | set REST requestor as carrier technology         |
                  +-------+--------------------------------------------------+
                  | **2** | the URL of the HTTP server for events            |
                  +-------+--------------------------------------------------+
                  | **3** | use HTTP PUT (remove this line to use HTTP POST) |
                  +-------+--------------------------------------------------+
                  | **4** | request timeout in milliseconds                  |
                  +-------+--------------------------------------------------+

               .. container:: paragraph

                  Further settings are required on the consumer to
                  define the event that is requested, for example:

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "eventName": "GuardResponseEvent", (1)
                        "eventNameFilter": "GuardResponseEvent", (2)
                        "requestorMode": true, (3)
                        "requestorPeer": "GuardRequestorProducer", (4)
                        "requestorTimeout": 500 (5)

               .. container:: colist arabic

                  +-------+---------------------------+
                  | **1** | the event name            |
                  +-------+---------------------------+
                  | **2** | a filter on the event     |
                  +-------+---------------------------+
                  | **3** | the mode of the requestor |
                  +-------+---------------------------+
                  | **4** | a peer for the requestor  |
                  +-------+---------------------------+
                  | **5** | a general request timeout |
                  +-------+---------------------------+

REST Requestor Output
=====================

               .. container:: paragraph

                  APEX will connect to a given URL to send events, but
                  not receive any events.

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "carrierTechnologyParameters": {
                          "carrierTechnology": "RESTREQUESTOR", (1)
                          "parameterClassName": "org.onap.policy.apex.plugins.event.carrier.restrequestor.RESTRequestorCarrierTechnologyParameters"
                        },

               .. container:: colist arabic

                  +-------+------------------------------------------+
                  | **1** | set REST requestor as carrier technology |
                  +-------+------------------------------------------+

               .. container:: paragraph

                  Further settings are required on the consumer to
                  define the event that is requested, for example:

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "eventNameFilter": "GuardRequestEvent", (1)
                        "requestorMode": true, (2)
                        "requestorPeer": "GuardRequestorConsumer", (3)
                        "requestorTimeout": 500 (4)

               .. container:: colist arabic

                  +-------+---------------------------+
                  | **1** | a filter on the event     |
                  +-------+---------------------------+
                  | **2** | the mode of the requestor |
                  +-------+---------------------------+
                  | **3** | a peer for the requestor  |
                  +-------+---------------------------+
                  | **4** | a general request timeout |
                  +-------+---------------------------+

Event Protocols, Format and Encoding
------------------------------------

         .. container:: paragraph

            Event protocols define what event formats APEX can receive
            (input) and should send (output). They can be used in any
            combination for input and output, unless further restricted
            by a carrier technology plugin (for instance for JMS
            output). There can only be 1 event protocol per event
            plugin.

         .. container:: paragraph

            Supported *input* event protocols are:

         .. container:: ulist

            -  JSON, the event as a JSON string

            -  APEX, an APEX event

            -  JMS object, the event as a JMS object,

            -  JMS text, the event as a JMS text,

            -  XML, the event as an XML string,

            -  YAML, the event as YAML text

         .. container:: paragraph

            Supported *output* event protocols are:

         .. container:: ulist

            -  JSON, the event as a JSON string

            -  APEX, an APEX event

            -  JMS object, the event as a JMS object,

            -  JMS text, the event as a JMS text,

            -  XML, the event as an XML string,

            -  YAML, the event as YAML text

         .. container:: paragraph

            New event protocols can be added as plugins to APEX or
            developed outside APEX and added to an APEX deployment.

JSON Event
##########

            .. container:: paragraph

               The event protocol for JSON encoding does not require a
               specific plugin, it is supported by default. Furthermore,
               there is no difference in the configuration for the input
               and output interface.

            .. container:: paragraph

               For an input, APEX requires a well-formed JSON string.
               Well-formed here means according to the definitions of a
               policy. Any JSON string that is not defined as a trigger
               event (consume) will not be consumed (errors will be
               thrown). For output JSON events, APEX will always produce
               valid JSON strings according to the definition in the
               policy model.

            .. container:: paragraph

               The following JSON shows the configuration.

            .. container:: listingblock

               .. container:: content

                  .. code::

                     "eventProtocolParameters":{
                       "eventProtocol" : "JSON"
                     }

            .. container:: paragraph

               For JSON events, there are a few more optional
               parameters, which allow to define a mapping for standard
               event fields. An APEX event must have the fields
               ``name``, ``version``, ``source``, and ``target``
               defined. Sometimes it is not possible to configure a
               trigger or actioning system to use those fields. However,
               they might be in an event generated outside APEX (or used
               outside APEX) just with different names. To configure
               APEX to map between the different event names, simply add
               the following parameters to a JSON event:

            .. container:: listingblock

               .. container:: content

                  .. code::

                     "eventProtocolParameters":{
                       "eventProtocol" : "JSON",
                       "nameAlias"     : "policyName", (1)
                       "versionAlias"  : "policyVersion", (2)
                       "sourceAlias"   : "from", (3)
                       "targetAlias"   : "to", (4)
                       "nameSpaceAlias": "my.name.space" (5)
                     }

            .. container:: colist arabic

               +-----------------------------------+-----------------------------------+
               | **1**                             | mapping for the ``name`` field,   |
               |                                   | here from a field called          |
               |                                   | ``policyName``                    |
               +-----------------------------------+-----------------------------------+
               | **2**                             | mapping for the ``version``       |
               |                                   | field, here from a field called   |
               |                                   | ``policyVersion``                 |
               +-----------------------------------+-----------------------------------+
               | **3**                             | mapping for the ``source`` field, |
               |                                   | here from a field called ``from`` |
               |                                   | (only for an input event)         |
               +-----------------------------------+-----------------------------------+
               | **4**                             | mapping for the ``target`` field, |
               |                                   | here from a field called ``to``   |
               |                                   | (only for an output event)        |
               +-----------------------------------+-----------------------------------+
               | **5**                             | mapping for the ``nameSpace``     |
               |                                   | field, here from a field called   |
               |                                   | ``my.name.space``                 |
               +-----------------------------------+-----------------------------------+

APEX Event
##########
            .. container:: paragraph

               The event protocol for APEX events does not require a
               specific plugin, it is supported by default. Furthermore,
               there is no difference in the configuration for the input
               and output interface.

            .. container:: paragraph

               For input and output APEX uses APEX events.

            .. container:: paragraph

               The following JSON shows the configuration.

            .. container:: listingblock

               .. container:: content

                  .. code::

                     "eventProtocolParameters":{
                       "eventProtocol" : "APEX"
                     }

JMS Event
#########

            .. container:: paragraph

               The event protocol for JMS is provided by the APEX JMS
               plugin. The plugin supports encoding as JSON text or as
               object. There is no difference in the configuration for
               the input and output interface.

JMS Text
========
               .. container:: paragraph

                  If used as input, APEX will take a JMS message and
                  extract a JSON string, then proceed as if a JSON event
                  was received. If used as output, APEX will take the
                  event produced by a policy, create a JSON string, and
                  then wrap it into a JMS message.

               .. container:: paragraph

                  The configuration for JMS text is as follows:

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "eventProtocolParameters":{
                          "eventProtocol" : "JMSTEXT",
                          "parameterClassName" :
                            "org.onap.policy.apex.plugins.event.protocol.jms.JMSTextEventProtocolParameters"
                        }

JMS Object
==========
               .. container:: paragraph

                  If used as input, APEX will will take a JMS message,
                  extract a Java Bean from the ``ObjectMessage``
                  message, construct an APEX event and put the bean on
                  the APEX event as a parameter. If used as output, APEX
                  will take the event produced by a policy, create a
                  Java Bean and send it as a JMS message.

               .. container:: paragraph

                  The configuration for JMS object is as follows:

               .. container:: listingblock

                  .. container:: content

                     .. code::

                        "eventProtocolParameters":{
                          "eventProtocol" : "JMSOBJECT",
                          "parameterClassName" :
                            "org.onap.policy.apex.plugins.event.protocol.jms.JMSObjectEventProtocolParameters"
                        }

YAML Event
##########

            .. container:: paragraph

               The event protocol for YAML is provided by the APEX YAML
               plugin. There is no difference in the configuration for
               the input and output interface.

            .. container:: paragraph

               If used as input, APEX will consume events as YAML and
               map them to policy trigger events. Not well-formed YAML
               and not understood trigger events will be rejected. If
               used as output, APEX produce YAML encoded events from the
               event a policy produces. Those events will always be
               well-formed according to the definition in the policy
               model.

            .. container:: paragraph

               The following code shows the configuration.

            .. container:: listingblock

               .. container:: content

                  .. code::

                     "eventProtocolParameters":{
                       "eventProtocol" : "XML",
                       "parameterClassName" :
                           "org.onap.policy.apex.plugins.event.protocol.yaml.YamlEventProtocolParameters"
                     }

XML Event
#########
            .. container:: paragraph

               The event protocol for XML is provided by the APEX XML
               plugin. There is no difference in the configuration for
               the input and output interface.

            .. container:: paragraph

               If used as input, APEX will consume events as XML and map
               them to policy trigger events. Not well-formed XML and
               not understood trigger events will be rejected. If used
               as output, APEX produce XML encoded events from the event
               a policy produces. Those events will always be
               well-formed according to the definition in the policy
               model.

            .. container:: paragraph

               The following code shows the configuration.

            .. container:: listingblock

               .. container:: content

                  .. code::

                     "eventProtocolParameters":{
                       "eventProtocol" : "XML",
                       "parameterClassName" :
                           "org.onap.policy.apex.plugins.event.protocol.xml.XMLEventProtocolParameters"
                     }

A configuration example
-----------------------

         .. container:: paragraph

            The following example loads all available plug-ins.

         .. container:: paragraph

            Events are consumed from a Websocket, APEX as client.
            Consumed event format is JSON.

         .. container:: paragraph

            Events are produced to Kafka. Produced event format is XML.

         .. container:: listingblock

            .. container:: content

               .. code::

                  {
                    "engineServiceParameters" : {
                      "name"          : "MyApexEngine",
                      "version"        : "0.0.1",
                      "id"             :  45,
                      "instanceCount"  : 4,
                      "deploymentPort" : 12345,
                      "policyModelFileName" : "examples/models/some-model.json",
                      "engineParameters"    : {
                        "executorParameters" : {
                          "JAVASCRIPT" : {
                            "parameterClassName" :
                                "org.onap.policy.apex.plugins.executor.javascript.JavascriptExecutorParameters"
                          },
                          "JYTHON" : {
                            "parameterClassName" :
                                "org.onap.policy.apex.plugins.executor.jython.JythonExecutorParameters"
                          },
                          "JRUBY" : {
                            "parameterClassName" :
                                "org.onap.policy.apex.plugins.executor.jruby.JrubyExecutorParameters"
                          },
                          "JAVA" : {
                            "parameterClassName" :
                                "org.onap.policy.apex.plugins.executor.java.JavaExecutorParameters"
                          },
                          "MVEL" : {
                            "parameterClassName" :
                                "org.onap.policy.apex.plugins.executor.mvel.MVELExecutorParameters"
                          }
                        },
                        "contextParameters" : {
                          "parameterClassName" :
                              "org.onap.policy.apex.context.parameters.ContextParameters",
                          "schemaParameters" : {
                            "Avro":{
                               "parameterClassName" :
                                   "org.onap.policy.apex.plugins.context.schema.avro.AvroSchemaHelperParameters"
                            }
                          }
                        }
                      }
                    },
                    "producerCarrierTechnologyParameters" : {
                      "carrierTechnology" : "KAFKA",
                      "parameterClassName" :
                          "org.onap.policy.apex.plugins.event.carrier.kafka.KAFKACarrierTechnologyParameters",
                      "parameters" : {
                        "bootstrapServers"  : "localhost:49092",
                        "acks"              : "all",
                        "retries"           : 0,
                        "batchSize"         : 16384,
                        "lingerTime"        : 1,
                        "bufferMemory"      : 33554432,
                        "producerTopic"     : "apex-out",
                        "keySerializer"     : "org.apache.kafka.common.serialization.StringSerializer",
                        "valueSerializer"   : "org.apache.kafka.common.serialization.StringSerializer"
                      }
                    },
                    "producerEventProtocolParameters" : {
                      "eventProtocol" : "XML",
                           "parameterClassName" :
                               "org.onap.policy.apex.plugins.event.protocol.xml.XMLEventProtocolParameters"
                    },
                    "consumerCarrierTechnologyParameters" : {
                      "carrierTechnology" : "WEBSOCKET",
                      "parameterClassName" :
                          "org.onap.policy.apex.plugins.event.carrier.websocket.WEBSOCKETCarrierTechnologyParameters",
                      "parameters" : {
                        "host" : "localhost",
                        "port" : 88888
                      }
                    },
                    "consumerEventProtocolParameters" : {
                      "eventProtocol" : "JSON"
                    }
                  }

Engine and Applications of the APEX System
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Introduction to APEX Engine and Applications
--------------------------------------------

         .. container:: paragraph

            The core of APEX is the APEX Engine, also known as the APEX
            Policy Engine or the APEX PDP (since it is in fact a Policy
            Decision Point). Beside this engine, an APEX system comes
            with a few applications intended to help with policy
            authoring, deployment, and execution.

         .. container:: paragraph

            The engine itself and most applications are started from the
            command line with command line arguments. This is called a
            Command Line Interface (CLI). Some applications require an
            installation on a webserver, as for instance the REST
            Editor. Those applications can be accessed via a web
            browser.

         .. container:: paragraph

            You can also use the available APEX APIs and applications to
            develop other applications as required. This includes policy
            languages (and associated parsers and compilers /
            interpreters), GUIs to access APEX or to define policies,
            clients to connect to APEX, etc.

         .. container:: paragraph

            For this documentation, we assume an installation of APEX as
            a full system based on a current ONAP release.

CLI on Unix, Windows, and Cygwin
--------------------------------

         .. container:: paragraph

            A note on APEX CLI applications: all applications and the
            engine itself have been deployed and tested on different
            operating systems: Red Hat, Ubuntu, Debian, Mac OSX,
            Windows, Cygwin. Each operating system comes with its own
            way of configuring and executing Java. The main items here
            are:

         .. container:: ulist

            -  For UNIX systems (RHL, Ubuntu, Debian, Mac OSX), the
               provided bash scripts work as expected with absolute
               paths (e.g.
               ``/opt/app/policy/apex-pdp/apex-pdp-2.0.0-SNAPSHOT/examples``),
               indirect and linked paths (e.g. ``../apex/apex``), and
               path substitutions using environment settings (e.g.
               ``$APEX_HOME/bin/``)

            -  For Windows systems, the provided batch files (``.bat``)
               work as expected with with absolute paths (e.g.
               ``C:\apex\apex-2.0.0-SNAPSHOT\examples``), and path
               substitutions using environment settings (e.g.
               ``%APEX_HOME%\bin\``)

            -  For Cygwin system we assume a standard Cygwin
               installation with standard tools (mainly bash) using a
               Windows Java installation. This means that the bash
               scripts can be used as in UNIX, however any argument
               pointing to files and directories need to use either a
               DOS path (e.g.
               ``C:\apex\apex-2.0.0-SNAPSHOT\examples\config...``) or
               the command ``cygpath`` with a mixed option. The reason
               for that is: Cygwin executes Java using UNIX paths but
               then runs Java as a DOS/WINDOWS process, which requires
               DOS paths for file access.

The APEX Engine
---------------

         .. container:: paragraph

            The APEX engine can be started in different ways, depending
            your requirements. All scripts are located in the APEX *bin*
            directory

         .. container:: paragraph

            On UNIX and Cygwin systems use:

         .. container:: ulist

            -  ``apexEngine.sh`` - this script will

               .. container:: ulist

                  -  Test if ``$APEX_USER`` is set and if the user
                     exists, terminate with an error otherwise

                  -  Test if ``$APEX_HOME`` is set. If not set, it will
                     use the default setting as
                     ``/opt/app/policy/apex-pdp/apex-pdp``. Then the set
                     directory is tested to exist, the script will
                     terminate if not.

                  -  When all tests are passed successfully, the script
                     will call ``apexApps.sh`` with arguments to start
                     the APEX engine.

            -  ``apexApps.sh engine`` - this is the general APEX
               application launcher, which will

               .. container:: ulist

                  -  Start the engine with the argument ``engine``

                  -  Test if ``$APEX_HOME`` is set and points to an
                     existing directory. If not set or directory does
                     not exist, script terminates.

                  -  Not test for any settings of ``$APEX_USER``.

         .. container:: paragraph

            On Windows systems use ``apexEngine.bat`` and
            ``apexApps.bat engine`` respectively. Note: none of the
            windows batch files will test for ``%APEX_USER%``.

         .. container:: paragraph

            Summary of alternatives to start the APEX Engine:

         +--------------------------------------------------------+----------------------------------------------------------+
         | Unix, Cygwin                                           | Windows                                                  |
         +========================================================+==========================================================+
         | .. container::                                         | .. container::                                           |
         |                                                        |                                                          |
         |    .. container:: listingblock                         |    .. container:: listingblock                           |
         |                                                        |                                                          |
         |       .. container:: content                           |       .. container:: content                             |
         |                                                        |                                                          |
         |          .. code::                                     |          .. code::                                       |
         |                                                        |                                                          |
         |             # $APEX_HOME/bin/apexEngine.sh [args]      |             > %APEX_HOME%\bin\apexEngine.bat [args]      |
         |             # $APEX_HOME/bin/apexApps.sh engine [args] |             > %APEX_HOME%\bin\apexApps.bat engine [args] |
         +--------------------------------------------------------+----------------------------------------------------------+

         .. container:: paragraph

            The APEX engine comes with a few CLI arguments for setting
            configuration and policy model. The configuration file is
            always required. The policy model file is only required if
            no model file is specified in the configuration, or if the
            specified model file should be over written. The option
            ``-h`` prints a help screen.

         .. container:: listingblock

            .. container:: content

               .. code::

                  usage: org.onap.policy.apex.service.engine.main.ApexMain [options...]
                  options
                  -c,--config-file <CONFIG_FILE>  the full path to the configuration file to use, the configuration file must be a Json file
                                                  containing the Apex configuration parameters
                  -h,--help                       outputs the usage of this command
                  -m,--model-file <MODEL_FILE>    the full path to the model file to use, if set it overrides the model file set in the
                                                  configuration file
                  -v,--version                    outputs the version of Apex

The APEX CLI Editor
-------------------

         .. container:: paragraph

            The CLI Editor allows to define policies from the command
            line. The application uses a simple language and supports
            all elements of an APEX policy. It can be used in to
            different ways:

         .. container:: ulist

            -  non-interactive, specifying a file with the commands to
               create a policy

            -  interactive, using the editors CLI to create a policy

         .. container:: paragraph

            When a policy is fully specified, the editor will generate
            the APEX core policy specification in JSON. This core
            specification is called the policy model in the APEX engine
            and can be used directly with the APEX engine.

         .. container:: paragraph

            On UNIX and Cygwin systems use:

         .. container:: ulist

            -  ``apexCLIEditor.sh`` - simply starts the CLI editor,
               arguments to the script determine the mode of the editor

            -  ``apexApps.sh cli-editor`` - simply starts the CLI
               editor, arguments to the script determine the mode of the
               editor

         .. container:: paragraph

            On Windows systems use:

         .. container:: ulist

            -  ``apexCLIEditor.bat`` - simply starts the CLI editor,
               arguments to the script determine the mode of the editor

            -  ``apexApps.bat cli-editor`` - simply starts the CLI
               editor, arguments to the script determine the mode of the
               editor

         .. container:: paragraph

            Summary of alternatives to start the APEX CLI Editor:

         +------------------------------------------------------------+--------------------------------------------------------------+
         | Unix, Cygwin                                               | Windows                                                      |
         +============================================================+==============================================================+
         | .. container::                                             | .. container::                                               |
         |                                                            |                                                              |
         |    .. container:: listingblock                             |    .. container:: listingblock                               |
         |                                                            |                                                              |
         |       .. container:: content                               |       .. container:: content                                 |
         |                                                            |                                                              |
         |          .. code::                                         |          .. code::                                           |
         |                                                            |                                                              |
         |             # $APEX_HOME/bin/apexCLIEditor.sh.sh [args]    |             > %APEX_HOME%\bin\apexCLIEditor.bat [args]       |
         |             # $APEX_HOME/bin/apexApps.sh cli-editor [args] |             > %APEX_HOME%\bin\apexApps.bat cli-editor [args] |
         +------------------------------------------------------------+--------------------------------------------------------------+

         .. container:: paragraph

            The option ``-h`` provides a help screen with all command
            line arguments.

         .. container:: listingblock

            .. container:: content

               .. code::

                  usage: org.onap.policy.apex.auth.clieditor.ApexCLIEditorMain [options...]
                  options
                   -a,--model-props-file <MODEL_PROPS_FILE>       name of the apex model properties file to use
                   -c,--command-file <COMMAND_FILE>               name of a file containing editor commands to run into the editor
                   -h,--help                                      outputs the usage of this command
                   -i,--input-model-file <INPUT_MODEL_FILE>       name of a file that contains an input model for the editor
                   -if,--ignore-failures <IGNORE_FAILURES_FLAG>   true or false, ignore failures of commands in command files and continue
                                                                  executing the command file
                   -l,--log-file <LOG_FILE>                       name of a file that will contain command logs from the editor, will log
                                                                  to standard output if not specified or suppressed with "-nl" flag
                   -m,--metadata-file <CMD_METADATA_FILE>         name of the command metadata file to use
                   -nl,--no-log                                   if specified, no logging or output of commands to standard output or log
                                                                  file is carried out
                   -nm,--no-model-output                          if specified, no output of a model to standard output or model output
                                                                  file is carried out, the user can use the "save" command in a script to
                                                                  save a model
                   -o,--output-model-file <OUTPUT_MODEL_FILE>     name of a file that will contain the output model for the editor, will
                                                                  output model to standard output if not specified or suppressed with
                                                                  "-nm" flag
                   -wd,--working-directory <WORKING_DIRECTORY>    the working directory that is the root for the CLI editor and is the
                                                                  root from which to look for included macro files

The APEX REST Editor
--------------------

         .. container:: paragraph

            The standard way to use the APEX REST Editor is via an
            installation of the *war* file on a webserver. However, the
            REST editor can also be started via command line. This will
            start a Grizzly webserver with the *war* deployed. Access to
            the REST Editor is then via the provided URL

         .. container:: paragraph

            On UNIX and Cygwin systems use:

         .. container:: ulist

            -  ``apexRESTEditor.sh`` - simply starts the webserver with
               the REST editor

            -  ``apexApps.sh rest-editor`` - simply starts the webserver
               with the REST editor

         .. container:: paragraph

            On Windows systems use:

         .. container:: ulist

            -  ``apexRESTEditor.bat`` - simply starts the webserver with
               the REST editor

            -  ``apexApps.bat rest-editor`` - simply starts the
               webserver with the REST editor

         .. container:: paragraph

            Summary of alternatives to start the APEX REST Editor:

         +-------------------------------------------------------------+---------------------------------------------------------------+
         | Unix, Cygwin                                                | Windows                                                       |
         +=============================================================+===============================================================+
         | .. container::                                              | .. container::                                                |
         |                                                             |                                                               |
         |    .. container:: listingblock                              |    .. container:: listingblock                                |
         |                                                             |                                                               |
         |       .. container:: content                                |       .. container:: content                                  |
         |                                                             |                                                               |
         |          .. code::                                          |          .. code::                                            |
         |                                                             |                                                               |
         |             # $APEX_HOME/bin/apexRESTEditor.sh.sh [args]    |             > %APEX_HOME%\bin\apexRESTEditor.bat [args]       |
         |             # $APEX_HOME/bin/apexApps.sh rest-editor [args] |             > %APEX_HOME%\bin\apexApps.bat rest-editor [args] |
         +-------------------------------------------------------------+---------------------------------------------------------------+

         .. container:: paragraph

            The option ``-h`` provides a help screen with all command
            line arguments.

         .. container:: listingblock

            .. container:: content

               .. code::

                  usage: org.onap.policy.apex.client.editor.rest.ApexEditorMain [options...]
                  -h,--help                        outputs the usage of this command
                  -l,--listen <ADDRESS>            the IP address to listen on.  Default value is localhost to restrict access to the
                                                   local machine only.
                  -p,--port <PORT>                 port to use for the Apex RESTful editor REST calls.
                  -t,--time-to-live <TIME_TO_LIVE> the amount of time in seconds that the server will run for before terminating. Default
                                                   value is -1 to run indefinitely.

         .. container:: paragraph

            If the REST Editor is started without any arguments the
            final messages will look similar to this:

         .. container:: listingblock

            .. container:: content

               .. code::

                  Apex Editor REST endpoint (ApexEditorMain: Config=[ApexEditorParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=READY) starting at http://localhost:18989/apexservices/ . . .
                  Sep 05, 2018 11:24:30 PM org.glassfish.grizzly.http.server.NetworkListener start
                  INFO: Started listener bound to [localhost:18989]
                  Sep 05, 2018 11:24:30 PM org.glassfish.grizzly.http.server.HttpServer start
                  INFO: [HttpServer] Started.
                  Apex Editor REST endpoint (ApexEditorMain: Config=[ApexEditorParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=RUNNING) started at http://localhost:18989/apexservices/

         .. container:: paragraph

            The last line states the URL on which the REST Editor can be
            accessed. The example above stated
            ``http://0.0.0.0:18989/apex/``. In a web browser use the URL
            ``http://localhost:18989`` and the REST Editor will start.

The APEX Monitoring Client
--------------------------

         .. container:: paragraph

            The standard way to use the APEX Monitoring Client is via an
            installation of the *war* file on a webserver. However, the
            Monitoring Client can also be started via command line. This
            will start a Grizzly webserver with the *war* deployed.
            Access to the Monitoring Client is then via the provided URL

         .. container:: paragraph

            On UNIX and Cygwin systems use:

         .. container:: ulist

            -  ``apexApps.sh eng-monitoring`` - simply starts the
               webserver with the Monitoring Client

         .. container:: paragraph

            On Windows systems use:

         .. container:: ulist

            -  ``apexApps.bat eng-monitoring`` - simply starts the
               webserver with the Monitoring Client

         .. container:: paragraph

            The option ``-h`` provides a help screen with all command
            line arguments.

         .. container:: listingblock

            .. container:: content

               .. code::

                  usage: org.onap.policy.apex.client.monitoring.rest.ApexMonitoringRestMain [options...]
                  -h,--help                        outputs the usage of this command
                  -p,--port <PORT>                 port to use for the Apex Services REST calls
                  -t,--time-to-live <TIME_TO_LIVE> the amount of time in seconds that the server will run for before terminating

         .. container:: paragraph

            If the Monitoring Client is started without any arguments
            the final messages will look similar to this:

         .. container:: listingblock

            .. container:: content

               .. code::

                  Apex Services REST endpoint (ApexMonitoringRestMain: Config=[ApexMonitoringRestParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=READY) starting at http://localhost:18989/apexservices/ . . .
                  Sep 05, 2018 11:26:20 PM org.glassfish.grizzly.http.server.NetworkListener start
                  INFO: Started listener bound to [localhost:18989]
                  Sep 05, 2018 11:26:20 PM org.glassfish.grizzly.http.server.HttpServer start
                  INFO: [HttpServer] Started.
                  Apex Services REST endpoint (ApexMonitoringRestMain: Config=[ApexMonitoringRestParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=RUNNING) started at http://localhost:18989/apexservices/

         .. container:: paragraph

            The last line states the URL on which the Monitoring Client
            can be accessed. The example above stated
            ``http://localhost:18989/apexservices``. In a web browser
            use the URL ``http://localhost:18989``.

The APEX Deployment Client
--------------------------

         .. container:: paragraph

            The standard way to use the APEX Deployment Client is via an
            installation of the *war* file on a webserver. However, the
            Deployment Client can also be started via command line. This
            will start a Grizzly webserver with the *war* deployed.
            Access to the Deployment Client is then via the provided URL

         .. container:: paragraph

            On UNIX and Cygwin systems use:

         .. container:: ulist

            -  ``apexApps.sh eng-deployment`` - simply starts the
               webserver with the Deployment Client

         .. container:: paragraph

            On Windows systems use:

         .. container:: ulist

            -  ``apexApps.bat eng-deployment`` - simply starts the
               webserver with the Deployment Client

         .. container:: paragraph

            The option ``-h`` provides a help screen with all command
            line arguments.

         .. container:: listingblock

            .. container:: content

               .. code::

                  usage: org.onap.policy.apex.client.deployment.rest.ApexDeploymentRestMain [options...]
                  -h,--help                        outputs the usage of this command
                  -p,--port <PORT>                 port to use for the Apex Services REST calls
                  -t,--time-to-live <TIME_TO_LIVE> the amount of time in seconds that the server will run for before terminating

         .. container:: paragraph

            If the Deployment Client is started without any arguments
            the final messages will look similar to this:

         .. container:: listingblock

            .. container:: content

               .. code::

                  Apex Services REST endpoint (ApexDeploymentRestMain: Config=[ApexDeploymentRestParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=READY) starting at http://localhost:18989/apexservices/ . . .
                  Sep 05, 2018 11:27:09 PM org.glassfish.grizzly.http.server.NetworkListener start
                  INFO: Started listener bound to [localhost:18989]
                  Sep 05, 2018 11:27:09 PM org.glassfish.grizzly.http.server.HttpServer start
                  INFO: [HttpServer] Started.
                  Apex Services REST endpoint (ApexDeploymentRestMain: Config=[ApexDeploymentRestParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=RUNNING) started at http://localhost:18989/apexservices/

         .. container:: paragraph

            The last line states the URL on which the Deployment Client
            can be accessed. The example above stated
            ``http://localhost:18989/apexservices``. In a web browser
            use the URL ``http://localhost:18989``.

The APEX Full Client
--------------------

         .. container:: paragraph

            The APEX Full Client combines the REST Editor, the
            Monitoring Client, and the Deployment Client into a single
            application. The standard way to use the APEX Full Client is
            via an installation of the *war* file on a webserver.
            However, the Full Client can also be started via command
            line. This will start a Grizzly webserver with the *war*
            deployed. Access to the Full Client is then via the provided
            URL

         .. container:: paragraph

            On UNIX and Cygwin systems use:

         .. container:: ulist

            -  ``apexApps.sh full-client`` - simply starts the webserver
               with the Full Client

         .. container:: paragraph

            On Windows systems use:

         .. container:: ulist

            -  ``apexApps.bat full-client`` - simply starts the
               webserver with the Full Client

         .. container:: paragraph

            The option ``-h`` provides a help screen with all command
            line arguments.

         .. container:: listingblock

            .. container:: content

               .. code::

                  usage: org.onap.policy.apex.client.full.rest.ApexServicesRestMain [options...]
                  -h,--help                        outputs the usage of this command
                  -p,--port <PORT>                 port to use for the Apex Services REST calls
                  -t,--time-to-live <TIME_TO_LIVE> the amount of time in seconds that the server will run for before terminating

         .. container:: paragraph

            If the Full Client is started without any arguments the
            final messages will look similar to this:

         .. container:: listingblock

            .. container:: content

               .. code::

                  Apex Editor REST endpoint (ApexServicesRestMain: Config=[ApexServicesRestParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=READY) starting at http://localhost:18989/apexservices/ . . .
                  Sep 05, 2018 11:28:28 PM org.glassfish.grizzly.http.server.NetworkListener start
                  INFO: Started listener bound to [localhost:18989]
                  Sep 05, 2018 11:28:28 PM org.glassfish.grizzly.http.server.HttpServer start
                  INFO: [HttpServer] Started.
                  Apex Editor REST endpoint (ApexServicesRestMain: Config=[ApexServicesRestParameters: URI=http://localhost:18989/apexservices/, TTL=-1sec], State=RUNNING) started at http://localhost:18989/apexservices/

         .. container:: paragraph

            The last line states the URL on which the Monitoring Client
            can be accessed. The example above stated
            ``http://localhost:18989/apexservices``. In a web browser
            use the URL ``http://localhost:18989``.

 The APEX Application Launcher
------------------------------

         .. container:: paragraph

            The standard applications (Engine, CLI Editor, REST Editor)
            come with dedicated start scripts. For all other APEX
            applications, we provide an application launcher.

         .. container:: paragraph

            On UNIX and Cygwin systems use:

         .. container:: ulist

            -  apexApps.sh\` - simply starts the application launcher

         .. container:: paragraph

            On Windows systems use:

         .. container:: ulist

            -  ``apexApps.bat`` - simply starts the application launcher

         .. container:: paragraph

            Summary of alternatives to start the APEX application
            launcher:

         +-------------------------------------------------+---------------------------------------------------+
         | Unix, Cygwin                                    | Windows                                           |
         +=================================================+===================================================+
         | .. container::                                  | .. container::                                    |
         |                                                 |                                                   |
         |    .. container:: listingblock                  |    .. container:: listingblock                    |
         |                                                 |                                                   |
         |       .. container:: content                    |       .. container:: content                      |
         |                                                 |                                                   |
         |          .. code::                              |          .. code::                                |
         |                                                 |                                                   |
         |             # $APEX_HOME/bin/apexApps.sh [args] |             > %APEX_HOME%\bin\apexApps.bat [args] |
         +-------------------------------------------------+---------------------------------------------------+

         .. container:: paragraph

            The option ``-h`` provides a help screen with all launcher
            command line arguments.

         .. container:: listingblock

            .. container:: content

               .. code::

                  apexApps.sh - runs APEX applications

                         Usage:  apexApps.sh [options] | [<application> [<application options>]]

                         Options
                           -d <app>    - describes an application
                           -l          - lists all applications supported by this script
                           -h          - this help screen

         .. container:: paragraph

            Using ``-l`` lists all known application the launcher can
            start.

         .. container:: listingblock

            .. container:: content

               .. code::

                  apexApps.sh: supported applications:
                   --> ws-echo engine eng-monitoring full-client eng-deployment tpl-event-json model-2-cli rest-editor cli-editor ws-console

         .. container:: paragraph

            Using the ``-d <name>`` option describes the named
            application, for instance for the ``ws-console``:

         .. container:: listingblock

            .. container:: content

               .. code::

                  apexApps.sh: application 'ws-console'
                   --> a simple console sending events to APEX, connect to APEX consumer port

         .. container:: paragraph

            Launching an application is done by calling the script with
            only the application name and any CLI arguments for the
            application. For instance, starting the ``ws-echo``
            application with port ``8888``:

         .. container:: listingblock

            .. container:: content

               .. code::

                  apexApps.sh ws-echo -p 8888

Application: Create Event Templates
-----------------------------------

         .. container:: paragraph

            **Status: Experimental**

         .. container:: paragraph

            This application takes a policy model (JSON or XML encoded)
            and generates templates for events in JSON format. This can
            help when a policy defines rather complex trigger or action
            events or complex events between states. The application can
            produce events for the types: stimuli (policy trigger
            events), internal (events between policy states), and
            response (action events).

         +----------------------------------------------------------------+------------------------------------------------------------------+
         | Unix, Cygwin                                                   | Windows                                                          |
         +================================================================+==================================================================+
         | .. container::                                                 | .. container::                                                   |
         |                                                                |                                                                  |
         |    .. container:: listingblock                                 |    .. container:: listingblock                                   |
         |                                                                |                                                                  |
         |       .. container:: content                                   |       .. container:: content                                     |
         |                                                                |                                                                  |
         |          .. code::                                             |          .. code::                                               |
         |                                                                |                                                                  |
         |             # $APEX_HOME/bin/apexApps.sh tpl-event-json [args] |             > %APEX_HOME%\bin\apexApps.bat tpl-event-json [args] |
         +----------------------------------------------------------------+------------------------------------------------------------------+

         .. container:: paragraph

            The option ``-h`` provides a help screen.

         .. container:: listingblock

            .. container:: content

               .. code::

                  gen-model2event v{release-version} - generates JSON templates for events generated from a policy model
                  usage: gen-model2event
                   -h,--help                 prints this help and usage screen
                   -m,--model <MODEL-FILE>   set the input policy model file
                   -t,--type <TYPE>          set the event type for generation, one of:
                                             stimuli (trigger events), response (action
                                             events), internal (events between states)
                   -v,--version              prints the application version

         .. container:: paragraph

            The created templates are not valid events, instead they use
            some markup for values one will need to change to actual
            values. For instance, running the tool with the *Sample
            Domain* policy model as:

         .. container:: listingblock

            .. container:: content

               .. code::

                  apexApps.sh tpl-event-json -m $APEX_HOME/examples/models/SampleDomain/SamplePolicyModelJAVA.json -t stimuli

         .. container:: paragraph

            will produce the following status messages:

         .. container:: listingblock

            .. container:: content

               .. code::

                  gen-model2event: starting Event generator
                   --> model file: examples/models/SampleDomain/SamplePolicyModelJAVA.json
                   --> type: stimuli

         .. container:: paragraph

            and then run the generator application producing two event
            templates. The first template is called ``Event0000``.

         .. container:: listingblock

            .. container:: content

               .. code::

                  {
                          "name" : "Event0000",
                          "nameSpace" : "org.onap.policy.apex.sample.events",
                          "version" : "0.0.1",
                          "source" : "Outside",
                          "target" : "Match",
                          "TestTemperature" : ###double: 0.0###,
                          "TestTimestamp" : ###long: 0###,
                          "TestMatchCase" : ###integer: 0###,
                          "TestSlogan" : "###string###"
                  }

         .. container:: paragraph

            The values for the keys are marked with ``#`` and the
            expected type of the value. To create an actual stimuli
            event, all these markers need to be change to actual values,
            for instance:

         .. container:: listingblock

            .. container:: content

               .. code::

                  {
                          "name" : "Event0000",
                          "nameSpace" : "org.onap.policy.apex.sample.events",
                          "version" : "0.0.1",
                          "source" : "Outside",
                          "target" : "Match",
                          "TestTemperature" : 25,
                          "TestTimestamp" : 123456789123456789,
                          "TestMatchCase" : 1,
                          "TestSlogan" : "Testing the Match Case with Temperature 25"
                  }

Application: Convert a Policy Model to CLI Editor Commands
----------------------------------------------------------

         .. container:: paragraph

            **Status: Experimental**

         .. container:: paragraph

            This application takes a policy model (JSON or XML encoded)
            and generates commands for the APEX CLI Editor. This
            effectively reverses a policy specification realized with
            the CLI Editor.

         +-------------------------------------------------------------+---------------------------------------------------------------+
         | Unix, Cygwin                                                | Windows                                                       |
         +=============================================================+===============================================================+
         | .. container::                                              | .. container::                                                |
         |                                                             |                                                               |
         |    .. container:: listingblock                              |    .. container:: listingblock                                |
         |                                                             |                                                               |
         |       .. container:: content                                |       .. container:: content                                  |
         |                                                             |                                                               |
         |          .. code::                                          |          .. code::                                            |
         |                                                             |                                                               |
         |             # $APEX_HOME/bin/apexApps.sh model-2-cli [args] |             > %APEX_HOME%\bin\apexApps.bat model-2-cli [args] |
         +-------------------------------------------------------------+---------------------------------------------------------------+

         .. container:: paragraph

            The option ``-h`` provides a help screen.

         .. container:: listingblock

            .. container:: content

               .. code::

                  usage: gen-model2cli
                   -h,--help                 prints this help and usage screen
                   -m,--model <MODEL-FILE>   set the input policy model file
                   -sv,--skip-validation     switch of validation of the input file
                   -v,--version              prints the application version

         .. container:: paragraph

            For instance, running the tool with the *Sample Domain*
            policy model as:

         .. container:: listingblock

            .. container:: content

               .. code::

                  apexApps.sh model-2-cli -m $APEX_HOME/examples/models/SampleDomain/SamplePolicyModelJAVA.json

         .. container:: paragraph

            will produce the following status messages:

         .. container:: listingblock

            .. container:: content

               .. code::

                  gen-model2cli: starting CLI generator
                   --> model file: examples/models/SampleDomain/SamplePolicyModelJAVA.json

         .. container:: paragraph

            and then run the generator application producing all CLI
            Editor commands and printing them to standard out.

Application: Websocket Clients (Echo and Console)
-------------------------------------------------

         .. container:: paragraph

            **Status: Production**

         .. container:: paragraph

            The application launcher also provides a Websocket echo
            client and a Websocket console client. The echo client
            connects to APEX and prints all events it receives from
            APEX. The console client connects to APEX, reads input from
            the command line, and sends this input as events to APEX.

         +------------------------------------------------------------+--------------------------------------------------------------+
         | Unix, Cygwin                                               | Windows                                                      |
         +============================================================+==============================================================+
         | .. container::                                             | .. container::                                               |
         |                                                            |                                                              |
         |    .. container:: listingblock                             |    .. container:: listingblock                               |
         |                                                            |                                                              |
         |       .. container:: content                               |       .. container:: content                                 |
         |                                                            |                                                              |
         |          .. code::                                         |          .. code::                                           |
         |                                                            |                                                              |
         |             # $APEX_HOME/bin/apexApps.sh ws-echo [args]    |             > %APEX_HOME%\bin\apexApps.bat ws-echo [args]    |
         |             # $APEX_HOME/bin/apexApps.sh ws-console [args] |             > %APEX_HOME%\bin\apexApps.bat ws-console [args] |
         +------------------------------------------------------------+--------------------------------------------------------------+

         .. container:: paragraph

            The arguments are the same for both applications:

         .. container:: ulist

            -  ``-p`` defines the Websocket port to connect to (defaults
               to ``8887``)

            -  ``-s`` defines the host on which a Websocket server is
               running (defaults to ``localhost``)

         .. container:: paragraph

            A discussion on how to use these two applications to build
            an APEX system is detailed HowTo-Websockets.

My First Policy
^^^^^^^^^^^^^^^

Introduction
------------
         .. container:: paragraph

            Consider a scenario where a supermarket chain called
            *HyperM* controls how it sells items in a policy-based
            manner. Each time an item is processed by *HyperM*'s
            point-of-sale (PoS) system an event is generated and
            published about that item of stock being sold. This event
            can then be used to update stock levels, etc..

         .. container:: paragraph

            *HyperM* want to extend this approach to allow some checks
            to be performed before the sale can be completed. This can
            be achieved by requesting a policy-controlled decision as
            each item is processed by for sale by each PoS system. The
            decision process is integrated with *HyperM*'s other IT
            systems that manage stock control, sourcing and purchasing,
            personnel systems, etc.

         .. container:: paragraph

            In this document we will show how APEX and APEX Policies can
            be used to achieve this, starting with a simple policy,
            building up to more complicated policy that demonstrates the
            features of APEX.

Data Models
-----------

Sales Input Event
#################

            .. container:: paragraph

               Each time a PoS system processes a sales item an event
               with the following format is emitted:

            .. table:: Table 1. Sale Input Event

               +----------------------+----------------------+-----------------------+
               | Event                | Fields               | Description           |
               +======================+======================+=======================+
               | SALE_INPUT           | time, sale_ID,       | Event indicating a    |
               |                      | amount, item_ID,     | sale of an item is    |
               |                      | quantity,            | occurring             |
               |                      | assistant_ID,        |                       |
               |                      | branch_ID, notes, …​ |                       |
               +----------------------+----------------------+-----------------------+

            .. container:: paragraph

               In each ``SALE_INPUT`` event the ``sale_ID`` field is a
               unique ID generated by the PoS system. A timestamp for
               the event is stored in the ``time`` field. The ``amount``
               field refers to the value of the item(s) to be sold (in
               cents). The ``item_ID`` field is a unique identifier for
               each item type, and can be used to retrieve more
               information about the item from *HyperM*'s stock control
               system. The ``quantity`` field refers to the quantity of
               the item to be sold. The ``assistant_ID`` field is a
               unique identifier for the PoS operator, and can be used
               to retrieve more information about the operator from the
               *HyperM*'s personnel system. Since *HyperM* has many
               branches the ``branch_ID`` identifies the shop. The
               ``notes`` field contains arbitrary notes about the sale.

Sales Decision Event
####################

            .. container:: paragraph

               After a ``SALE_INPUT`` event is emitted by the PoS system
               *HyperM*'s policy-based controlled sales checking system
               emits a Sale Authorization Event indicating whether the
               sale is authorized or denied. The PoS system can then
               listen for this event before continuing with the sale.

            .. table:: Table 2. Sale Authorisation Event

               +----------------------+----------------------+-----------------------+
               | Event                | Fields               | Description           |
               +======================+======================+=======================+
               | SALE_AUTH            | sale_ID, time,       | Event indicating a    |
               |                      | authorized, amount,  | sale of an item is    |
               |                      | item_ID, quantity,   | authorized or denied  |
               |                      | assistant_ID,        |                       |
               |                      | branch_ID, notes,    |                       |
               |                      | message…​            |                       |
               +----------------------+----------------------+-----------------------+

            .. container:: paragraph

               In each ``SALE_AUTH`` event the ``sale_ID`` field is
               copied from the ``SALE_INPUT`` event that trigger the
               decision request. The ``SALE_AUTH`` event is also
               timestamped using the ``time`` field, and a field called
               ``authorised`` is set to ``true`` or ``false`` depending
               on whether the sale is authorized or denied. The
               ``message`` field carries an optional message about why a
               sale was not authorized. The other fields from the
               ``SALE_INPUT`` event are also included for completeness.

Stock Control: Items
####################

            .. container:: paragraph

               *HyperM* maintains information about each item for sale
               in a database table called ``ITEMS``.

            .. table:: Table 3. Items Database

               +----------------------+----------------------+-----------------------+
               | Table                | Fields               | Description           |
               +======================+======================+=======================+
               | ITEMS                | item_ID,             | Database table        |
               |                      | description,         | describing each item  |
               |                      | cost_price, barcode, | for sale              |
               |                      | supplier_ID,         |                       |
               |                      | category, …​         |                       |
               +----------------------+----------------------+-----------------------+

            .. container:: paragraph

               The database table ``ITEMS`` has a row for each items
               that *HyperM* sells. Each item is identified by an
               ``item_ID`` value. The ``description`` field stores a
               description of the item. The cost price of the item is
               given in ``cost_price``. The barcode of the item is
               encoded in ``barcode``, while the item supplier is
               identified by ``supplier_ID``. Items may also be
               classified into categories using the ``category`` field.
               Useful categories might include: ``soft drinks``,
               ``alcoholic drinks``, ``cigarettes``, ``knives``,
               ``confectionery``, ``bakery``, ``fruit&vegetables``,
               ``meat``, etc..

Personnel System: Assistants
############################

            .. table:: Table 4. Assistants Database

               +----------------------+----------------------+-----------------------+
               | Table                | Fields               | Description           |
               +======================+======================+=======================+
               | ASSISTANTS           | assistant_ID,        | Database table        |
               |                      | surname, firstname,  | describing each       |
               |                      | middlename, age,     | *HyperM* sales        |
               |                      | grade, phone_number, | assistant             |
               |                      | …​                   |                       |
               +----------------------+----------------------+-----------------------+

            .. container:: paragraph

               The database table ``ASSISTANTS`` has a row for each
               sales assistant employed by *HyperM*. Each assistant is
               identified by an ``assistant_ID`` value, with their name
               given in the ``firstname``, ``middlename`` and
               ``surname`` fields. The assistant’s age in years is given
               in ``age``, while their phone number is contained in the
               ``phone_number`` field. The assistant’s grade is encoded
               in ``grade``. Useful values for ``grade`` might include:
               ``trainee``, ``operator``, ``supervisor``, etc..

Locations: Branches
####################

            .. table:: Table 5. Branches Database

               +----------------------+----------------------+-----------------------+
               | Table                | Fields               | Description           |
               +======================+======================+=======================+
               | BRANCHES             | branch_ID,           | Database table        |
               |                      | branch_Name,         | describing each       |
               |                      | category, street,    | *HyperM* branch       |
               |                      | city, country,       |                       |
               |                      | postcode, …​         |                       |
               +----------------------+----------------------+-----------------------+

            .. container:: paragraph

               *HyperM* operates a number of branches. Each branch is
               described in the ``BRANCHES`` database table. Each branch
               is identified by a ``branch_ID``, with a branch name
               given in ``branch_Name``. The address for the branch is
               encoded in ``street``, ``city``, ``country`` and
               ``postcode``. The branch category is given in the
               ``category`` field. Useful values for ``category`` might
               include: ``Small``, ``Large``, ``Super``, ``Hyper``,
               etc..

Policy Step 1
-------------

Scenario
#########
            .. container:: paragraph

               For the first version of our policy, let’s start with
               something simple. Let us assume that there exists some
               restriction that alcohol products cannot be sold before
               11:30am. In this section we will go through the necessary
               steps to define a policy that can enforce this for
               *HyperM*.

            .. container:: ulist

               -  Alcohol cannot be sold before 11:30am.

Create the an new empty Policy Model ``MyFirstPolicyModel``
###########################################################

            .. container:: paragraph

               Since an organisation like *HyperM* may have many
               policies covering many different domains, policies should
               be grouped into policy sets. In order to edit or deploy a
               policy, or policy set, the definition of the policy(ies)
               and all required events, tasks, states, etc., are grouped
               together into a 'Policy Model'. An organization might
               define many Policy Models, each containing a different
               set of policies.

            .. container:: paragraph

               So the first step is to create a new empty Policy Model
               called ``MyFirstPolicyModel``. Using the APEX Policy
               Editor, click on the 'File' menus and select 'New'. Then
               define our new policy model called
               ``MyFirstPolicyModel``. Use the 'Generate UUID' button to
               create a new unique ID for the policy model, and fill in
               a description for the policy model. Press the ``Submit``
               button to save your changes.

            .. container:: imageblock

               .. container:: content

                  |File > New to create a new Policy Model|

               .. container:: title

                  Figure 4. Create a new Policy Model 1/2

            .. container:: imageblock

               .. container:: content

                  |Create a new Policy Model|

               .. container:: title

                  Figure 5. Create a new Policy Model 2/2

Create the input event ``SALE_INPUT`` and the output event ``SALE_AUTH``
########################################################################

            .. container:: paragraph

               Using the APEX Policy Editor, click on the 'Events' tab.
               In the 'Events' pane, right click and select 'New':

            .. container:: imageblock

               .. container:: content

                  |Right click to create a new event|

               .. container:: title

                  Figure 6. Create a new Event type

            .. container:: paragraph

               Create a new event type called ``SALE_INPUT``. Use the
               'Generate UUID' button to create a new unique ID for the
               event type, and fill in a description for the event. Add
               a namespace, e.g. ``com.hyperm``. We can add hard-coded
               strings for the ``Source`` and ``Target``, e.g. ``POS``
               and ``APEX``. At this stage we will not add any parameter
               fields, we will leave this until later. Use the
               ``Submit`` button to create the event.

            .. container:: imageblock

               .. container:: content

                  |Fill in the necessary information for the
                  'SALE_INPUT' event and click 'Submit'|

               .. container:: title

                  Figure 7. Populate the ``SALE_INPUT`` event

            .. container:: paragraph

               Repeat the same steps for a new event type called
               ``SALE_AUTH``. Just use ``APEX`` as source and ``POS`` as
               target, since this is the output event coming from APEX
               going to the sales point.

            .. container:: paragraph

               Before we can add parameter fields to an event we must
               first define APEX Context Item Schemas that can be used
               by those fields.

            .. container:: paragraph

               To create new item schemas, click on the 'Context Item
               Schemas' tab. In that 'Context Item Schemas' pane, right
               click and select 'Create new ContextSchema'.

            .. container:: imageblock

               .. container:: content

                  |Right click to create a new Item Schema|

               .. container:: title

                  Figure 8. Create new Data Types

            .. container:: paragraph

               Create item schemas with the following characteristics,
               each with its own unique UUID:

            .. table:: Table 6. Item Schemas

               +-------------------+-----------------+-----------------+----------------------+
               | Name              | Schema Flavour  | Schema          | Description          |
               |                   |                 | Definition      |                      |
               +===================+=================+=================+======================+
               | timestamp_type    | Java            | java.lang.Long  | A type for           |
               |                   |                 |                 | ``time`` values      |
               +-------------------+-----------------+-----------------+----------------------+
               | sale_ID_type      | Java            | java.lang.Long  | A type for           |
               |                   |                 |                 | ``sale_ID``          |
               |                   |                 |                 | values               |
               +-------------------+-----------------+-----------------+----------------------+
               | price_type        | Java            | java.lang.Long  | A type for           |
               |                   |                 |                 | ``amount``/``price`` |
               |                   |                 |                 | values               |
               +-------------------+-----------------+-----------------+----------------------+
               | item_ID_type      | Java            | java.lang.Long  | A type for           |
               |                   |                 |                 | ``item_ID``          |
               |                   |                 |                 | values               |
               +-------------------+-----------------+-----------------+----------------------+
               | assistant_ID_type | Java            | java.lang.Long  | A type for           |
               |                   |                 |                 | ``assistant_ID``     |
               |                   |                 |                 | values               |
               +-------------------+-----------------+-----------------+----------------------+
               | quantity_type     | Java            | java.lang.Integ | A type for           |
               |                   |                 | er              | ``quantity``         |
               |                   |                 |                 | values               |
               +-------------------+-----------------+-----------------+----------------------+
               | branch_ID_type    | Java            | java.lang.Long  | A type for           |
               |                   |                 |                 | ``branch_ID``        |
               |                   |                 |                 | values               |
               +-------------------+-----------------+-----------------+----------------------+
               | notes_type        | Java            | java.lang.Strin | A type for           |
               |                   |                 | g               | ``notes``            |
               |                   |                 |                 | values               |
               +-------------------+-----------------+-----------------+----------------------+
               | authorised_type   | Java            | java.lang.Boole | A type for           |
               |                   |                 | an              | ``authorised``       |
               |                   |                 |                 | values               |
               +-------------------+-----------------+-----------------+----------------------+
               | message_type      | Java            | java.lang.Strin | A type for           |
               |                   |                 | g               | ``message``          |
               |                   |                 |                 | values               |
               +-------------------+-----------------+-----------------+----------------------+

            .. container:: imageblock

               .. container:: content

                  |Create a new Item Schema|

               .. container:: title

                  Figure 9. Create new Item Schemas

            .. container:: paragraph

               The item schemas can now be seen on the 'Context Item
               Schemas' tab, and can be updated at any time by
               right-clicking on the item schemas on the 'Context Item
               Schemas' tab. Now we can go back to the event definitions
               for ``SALE_INPUT`` and ``SALE_AUTH`` and add some
               parameter fields.

            .. tip

               .. container:: title

                  Field Schema types       

               .. container:: paragraph

                  APEX natively supports schema definitions in ``Java`` and ``Avro``.
                                                                            
               .. container:: paragraph

                  ``Java`` schema definitions are simply the name of a Java Class. There are some restrictions:

               .. container:: ulist

                  -  the class must be instantiatable, i.e. not an Java interface or abstract class

                  -  primitive types are not supported, i.e. use ``java.lang.Integer`` instead of ``int``, etc.

                  -  it must be possible to find the class, i.e. the class must be contained in the Java classpath.

               .. container:: paragraph

                  ``Avro`` schema definitions can be any valid `Avro <https://avro.apache.org/docs/current/spec.html>`__
                  schema. For events using fields defined with ``Avro`` schemas, any incoming event containing that field must
                  contain a value that conforms to the Avro schema.

            .. container:: paragraph

               Click on the 'Events' tab, then right click the
               ``SALE_INPUT`` row and select 'Edit Event
               :literal:`SALE_INPUT’. To add a new event parameter use the 'Add Event Parameter' button at the bottom of the screen. For the `SALE_INPUT`
               event add the following event parameters:

            .. table:: Table 7. Event Parameter Fields for the ``SALE_INPUT`` Event

               +----------------------+----------------------+-----------------------+
               | Parameter Name       | Parameter Type       | Optional              |
               +======================+======================+=======================+
               | time                 | timestamp_type       | no                    |
               +----------------------+----------------------+-----------------------+
               | sale_ID              | sale_ID_type         | no                    |
               +----------------------+----------------------+-----------------------+
               | amount               | price_type           | no                    |
               +----------------------+----------------------+-----------------------+
               | item_ID              | item_ID_type         | no                    |
               +----------------------+----------------------+-----------------------+
               | quantity             | quantity_type        | no                    |
               +----------------------+----------------------+-----------------------+
               | assistant_ID         | assistant_ID_type    | no                    |
               +----------------------+----------------------+-----------------------+
               | branch_ID            | branch_ID_type       | no                    |
               +----------------------+----------------------+-----------------------+
               | notes                | notes_type           | *yes*                 |
               +----------------------+----------------------+-----------------------+

            .. container:: paragraph

               Remember to click the 'Submit' button at the bottom of
               the event definition pane.

            .. tip::
               Optional Fields in APEX Events
               Parameter fields can be *optional* in events. If a parameter is not marked as *optional* then by default it
               is *mandatory*, so it must appear in any input event passed to APEX. If an *optional* field is not set
               for an output event then value will be set to ``null``.

            .. container:: imageblock

               .. container:: content

                  |Add new event parameters to an event|

               .. container:: title

                  Figure 10. Add typed parameter fields to an event

            .. container:: paragraph

               Select the ``SALE_AUTH`` event and add the following
               event parameters:

            .. table:: Table 8. Event Parameter Fields for the ``SALE_AUTH`` Event

               +----------------------+----------------------+-----------------------+
               | Parameter Name       | Parameter Type       | no                    |
               +======================+======================+=======================+
               | sale_ID              | sale_ID_type         | no                    |
               +----------------------+----------------------+-----------------------+
               | time                 | timestamp_type       | no                    |
               +----------------------+----------------------+-----------------------+
               | authorised           | authorised_type      | no                    |
               +----------------------+----------------------+-----------------------+
               | message              | message_type         | *yes*                 |
               +----------------------+----------------------+-----------------------+
               | amount               | price_type           | no                    |
               +----------------------+----------------------+-----------------------+
               | item_ID              | item_ID_type         | no                    |
               +----------------------+----------------------+-----------------------+
               | assistant_ID         | assistant_ID_type    | no                    |
               +----------------------+----------------------+-----------------------+
               | quantity             | quantity_type        | no                    |
               +----------------------+----------------------+-----------------------+
               | branch_ID            | branch_ID_type       | no                    |
               +----------------------+----------------------+-----------------------+
               | notes                | notes_type           | *yes*                 |
               +----------------------+----------------------+-----------------------+

            .. container:: paragraph

               Remember to click the 'Submit' button at the bottom of
               the event definition pane.

            .. container:: paragraph

               The events for our policy are now defined.

Create a new Policy and add the *"No Booze before 11:30"* check
###############################################################

            .. container:: paragraph

               APEX policies are defined using a state-machine model.
               Each policy comprises one or more *states* that can be
               individually executed. Where there is more than one
               *state* the states are chained together to form a
               `Directed Acyclic Graph
               (DAG) <https://en.wikipedia.org/wiki/Directed_acyclic_graph>`__
               of states. A *state* is triggered by passing it a single
               input (or 'trigger') event and once executed each state
               then emits an output event. For each *state* the logic
               for the *state* is embedded in one or more *tasks*. Each
               *task* contains specific *task logic* that is executed by
               the APEX execution environment each time the *task* is
               invoked. Where there is more than one *task* in a *state*
               then the *state* also defines some *task selection logic*
               to select an appropriate task each time the *state* is
               executed.

            .. container:: paragraph

               Therefore, to create a new policy we must first define
               one or more tasks.

            .. container:: paragraph

               To create a new Task click on the 'Tasks' tab. In the
               'Tasks' pane, right click and select 'Create new Task'.
               Create a new Task called ``MorningBoozeCheck``. Use the
               'Generate UUID' button to create a new unique ID for the
               task, and fill in a description for the task.

            .. container:: imageblock

               .. container:: content

                  |Right click to create a new task|

               .. container:: title

                  Figure 11. Create a new Task

            .. container:: paragraph

               Tasks are configured with a set of *input fields* and a
               set of *output fields*. To add new input/output fields
               for a task use the 'Add Task Input Field' and 'Add Task
               Output Field' button. The list of input and out fields to
               add for the ``MorningBoozeCheck`` task are given below.
               The input fields are drawn from the parameters in the
               state’s input event, and the task’s output fields are
               used to populate the state’s output event. The task’s
               input and output fields must be a subset of the event
               parameters defined for the input and output events for
               any state that uses that task. (You may have noticed that
               the input and output fields for the ``MorningBoozeCheck``
               task have the exact same names and reuse the item schemas
               that we used for the parameters in the ``SALE_INPUT`` and
               ``SALE_AUTH`` events respectively).

            .. table:: Table 9. Input fields for ``MorningBoozeCheck`` task

               +-----------------------------------+-----------------------------------+
               | Parameter Name                    | Parameter Type                    |
               +===================================+===================================+
               | time                              | timestamp_type                    |
               +-----------------------------------+-----------------------------------+
               | sale_ID                           | sale_ID_type                      |
               +-----------------------------------+-----------------------------------+
               | amount                            | price_type                        |
               +-----------------------------------+-----------------------------------+
               | item_ID                           | item_ID_type                      |
               +-----------------------------------+-----------------------------------+
               | quantity                          | quantity_type                     |
               +-----------------------------------+-----------------------------------+
               | assistant_ID                      | assistant_ID_type                 |
               +-----------------------------------+-----------------------------------+
               | branch_ID                         | branch_ID_type                    |
               +-----------------------------------+-----------------------------------+
               | notes                             | notes_type                        |
               +-----------------------------------+-----------------------------------+

            .. table:: Table 10. Output fields for ``MorningBoozeCheck`` task

               +-----------------------------------+-----------------------------------+
               | Parameter Name                    | Parameter Type                    |
               +===================================+===================================+
               | sale_ID                           | sale_ID_type                      |
               +-----------------------------------+-----------------------------------+
               | time                              | timestamp_type                    |
               +-----------------------------------+-----------------------------------+
               | authorised                        | authorised_type                   |
               +-----------------------------------+-----------------------------------+
               | message                           | message_type                      |
               +-----------------------------------+-----------------------------------+
               | amount                            | price_type                        |
               +-----------------------------------+-----------------------------------+
               | item_ID                           | item_ID_type                      |
               +-----------------------------------+-----------------------------------+
               | assistant_ID                      | assistant_ID_type                 |
               +-----------------------------------+-----------------------------------+
               | quantity                          | quantity_type                     |
               +-----------------------------------+-----------------------------------+
               | branch_ID                         | branch_ID_type                    |
               +-----------------------------------+-----------------------------------+
               | notes                             | notes_type                        |
               +-----------------------------------+-----------------------------------+

            .. container:: imageblock

               .. container:: content

                  |Add input and out fields for the task|

               .. container:: title

                  Figure 12. Add input and out fields for the Task

            .. container:: paragraph

               Each task must include some 'Task Logic' that implements
               the behaviour for the task. Task logic can be defined in
               a number of different ways using a choice of languages.
               For this task we will author the logic using the
               Java-like scripting language called
               ```MVEL`` <https://en.wikipedia.org/wiki/MVEL>`__.

            .. container:: paragraph

               For simplicity use the following code for the task logic.
               Paste the script text into the 'Task Logic' box, and use
               "MVEL" as the 'Task Logic Type / Flavour'.

            .. container:: paragraph

               This logic assumes that all items with ``item_ID``
               between 1000 and 2000 contain alcohol, which is not very
               realistic, but we will see a better approach for this
               later. It also uses the standard ``Java`` time utilities
               to check if the current time is between ``00:00:00 GMT``
               and ``11:30:00 GMT``. For a detailed guide to how to
               write your own logic in
               ```JavaScript`` <https://en.wikipedia.org/wiki/JavaScript>`__,
               ```MVEL`` <https://en.wikipedia.org/wiki/MVEL>`__ or one
               of the other supported languages please refer to APEX
               Programmers Guide.

            .. container:: listingblock

               .. container:: title

                  MVEL code for the ``MorningBoozeCheck`` task

               .. container:: content

                  .. code::

                     /*
                      * ============LICENSE_START=======================================================
                      *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                      * ================================================================================
                      * Licensed under the Apache License, Version 2.0 (the "License");
                      * you may not use this file except in compliance with the License.
                      * You may obtain a copy of the License at
                      *
                      *      http://www.apache.org/licenses/LICENSE-2.0
                      *
                      * Unless required by applicable law or agreed to in writing, software
                      * distributed under the License is distributed on an "AS IS" BASIS,
                      * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                      * See the License for the specific language governing permissions and
                      * limitations under the License.
                      *
                      * SPDX-License-Identifier: Apache-2.0
                      * ============LICENSE_END=========================================================
                      */
                     import java.util.Date;
                     import java.util.Calendar;
                     import java.util.TimeZone;
                     import java.text.SimpleDateFormat;

                     logger.info("Task Execution: '"+subject.id+"'. Input Fields: '"+inFields+"'");

                     outFields.put("amount"      , inFields.get("amount"));
                     outFields.put("assistant_ID", inFields.get("assistant_ID"));
                     outFields.put("notes"       , inFields.get("notes"));
                     outFields.put("quantity"    , inFields.get("quantity"));
                     outFields.put("branch_ID"   , inFields.get("branch_ID"));
                     outFields.put("item_ID"     , inFields.get("item_ID"));
                     outFields.put("time"        , inFields.get("time"));
                     outFields.put("sale_ID"     , inFields.get("sale_ID"));

                     item_id = inFields.get("item_ID");

                     //The events used later to test this task use GMT timezone!
                     gmt = TimeZone.getTimeZone("GMT");
                     timenow = Calendar.getInstance(gmt);
                     df = new SimpleDateFormat("HH:mm:ss z");
                     df.setTimeZone(gmt);
                     timenow.setTimeInMillis(inFields.get("time"));

                     midnight = timenow.clone();
                     midnight.set(
                         timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH),
                         timenow.get(Calendar.DATE),0,0,0);
                     eleven30 = timenow.clone();
                     eleven30.set(
                         timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH),
                         timenow.get(Calendar.DATE),11,30,0);

                     itemisalcohol = false;
                     if(item_id != null && item_id >=1000 && item_id < 2000)
                         itemisalcohol = true;

                     if( itemisalcohol
                         && timenow.after(midnight) && timenow.before(eleven30)){
                       outFields.put("authorised", false);
                       outFields.put("message", "Sale not authorised by policy task "+subject.taskName+
                         " for time "+df.format(timenow.getTime())+
                         ". Alcohol can not be sold between "+df.format(midnight.getTime())+
                         " and "+df.format(eleven30.getTime()));
                       return true;
                     }
                     else{
                       outFields.put("authorised", true);
                       outFields.put("message", "Sale authorised by policy task "+subject.taskName+
                         " for time "+df.format(timenow.getTime()));
                       return true;
                     }

                     /*
                     This task checks if a sale request is for an item that is an alcoholic drink.
                     If the local time is between 00:00:00 GMT and 11:30:00 GMT then the sale is not
                     authorised. Otherwise the sale is authorised.
                     In this implementation we assume that items with item_ID value between 1000 and
                     2000 are all alcoholic drinks :-)
                     */

            .. container:: imageblock

               .. container:: content

                  |Add task logic the task|

               .. container:: title

                  Figure 13. Add Task Logic the Task

            .. container:: paragraph

               An alternative version of the same logic is available in
               JavaScript. Just use "JAVASCRIPT" as the 'Task Logic Type
               / Flavour' instead.

            .. container:: listingblock

               .. container:: title

                  Javascript alternative for the ``MorningBoozeCheck``
                  task

               .. container:: content

                  .. code::

                     /*
                      * ============LICENSE_START=======================================================
                      *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                      * ================================================================================
                      * Licensed under the Apache License, Version 2.0 (the "License");
                      * you may not use this file except in compliance with the License.
                      * You may obtain a copy of the License at
                      *
                      *      http://www.apache.org/licenses/LICENSE-2.0
                      *
                      * Unless required by applicable law or agreed to in writing, software
                      * distributed under the License is distributed on an "AS IS" BASIS,
                      * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                      * See the License for the specific language governing permissions and
                      * limitations under the License.
                      *
                      * SPDX-License-Identifier: Apache-2.0
                      * ============LICENSE_END=========================================================
                      */

                     var returnValueType = Java.type("java.lang.Boolean");
                     var returnValue = new returnValueType(true);

                     // Load compatibility script for imports etc
                     load("nashorn:mozilla_compat.js");
                     importPackage(java.text);
                     importClass(java.text.SimpleDateFormat);

                     executor.logger.info("Task Execution: '"+executor.subject.id+"'. Input Fields: '"+executor.inFields+"'");

                     executor.outFields.put("amount"      , executor.inFields.get("amount"));
                     executor.outFields.put("assistant_ID", executor.inFields.get("assistant_ID"));
                     executor.outFields.put("notes"       , executor.inFields.get("notes"));
                     executor.outFields.put("quantity"    , executor.inFields.get("quantity"));
                     executor.outFields.put("branch_ID"   , executor.inFields.get("branch_ID"));
                     executor.outFields.put("item_ID"     , executor.inFields.get("item_ID"));
                     executor.outFields.put("time"        , executor.inFields.get("time"));
                     executor.outFields.put("sale_ID"     , executor.inFields.get("sale_ID"));

                     item_id = executor.inFields.get("item_ID");

                     //All times in this script are in GMT/UTC since the policy and events assume time is in GMT.
                     var timenow_gmt =  new Date(Number(executor.inFields.get("time")));

                     var midnight_gmt = new Date(Number(executor.inFields.get("time")));
                     midnight_gmt.setUTCHours(0,0,0,0);

                     var eleven30_gmt = new Date(Number(executor.inFields.get("time")));
                     eleven30_gmt.setUTCHours(11,30,0,0);

                     var timeformatter = new java.text.SimpleDateFormat("HH:mm:ss z");

                     var itemisalcohol = false;
                     if(item_id != null && item_id >=1000 && item_id < 2000)
                         itemisalcohol = true;

                     if( itemisalcohol
                         && timenow_gmt.getTime() >= midnight_gmt.getTime()
                         && timenow_gmt.getTime() <  eleven30_gmt.getTime()) {

                       executor.outFields.put("authorised", false);
                       executor.outFields.put("message", "Sale not authorised by policy task " +
                         executor.subject.taskName+ " for time " + timeformatter.format(timenow_gmt.getTime()) +
                         ". Alcohol can not be sold between " + timeformatter.format(midnight_gmt.getTime()) +
                         " and " + timeformatter.format(eleven30_gmt.getTime()));
                     }
                     else{
                       executor.outFields.put("authorised", true);
                       executor.outFields.put("message", "Sale authorised by policy task " +
                         executor.subject.taskName + " for time "+timeformatter.format(timenow_gmt.getTime()));
                     }

                     /*
                     This task checks if a sale request is for an item that is an alcoholic drink.
                     If the local time is between 00:00:00 GMT and 11:30:00 GMT then the sale is not
                     authorised. Otherwise the sale is authorised.
                     In this implementation we assume that items with item_ID value between 1000 and
                     2000 are all alcoholic drinks :-)
                     */

            .. container:: paragraph

               The task definition is now complete so click the 'Submit'
               button to save the task. The task can now be seen on the
               'Tasks' tab, and can be updated at any time by
               right-clicking on the task on the 'Task' tab. Now that we
               have created our task, we can can create a policy that
               uses that task.

            .. container:: paragraph

               To create a new Policy click on the 'Policies' tab. In
               the 'Policies' pane, right click and select 'Create new
               Policy':

            .. container:: paragraph

               Create a new Policy called ``MyFirstPolicy``. Use the
               'Generate UUID' button to create a new unique ID for the
               policy, and fill in a description for the policy. Use
               'FREEFORM' as the 'Policy Flavour'.

            .. container:: paragraph

               Each policy must have at least one state. Since this is
               'freeform' policy we can add as many states as we wish.
               Let’s start with one state. Add a new state called
               ``BoozeAuthDecide`` to this ``MyFirstPolicy`` policy
               using the 'Add new State' button after filling in the
               name of our new state.

            .. container:: imageblock

               .. container:: content

                  |Create a new policy|

               .. container:: title

                  Figure 14. Create a new Policy

            .. container:: paragraph

               Each state must uses one input event type. For this new
               state select the ``SALE_INPUT`` event as the input event.

            .. container:: paragraph

               Each policy must define a 'First State' and a 'Policy
               Trigger Event'. The 'Policy Trigger Event' is the input
               event for the policy as a whole. This event is then
               passed to the first state in the chain of states in the
               policy, therefore the 'Policy Trigger Event' will be the
               input event for the first state. Each policy can only
               have one 'First State'. For our ``MyFirstPolicy`` policy,
               select ``BoozeAuthDecide`` as the 'First State'. This
               will automatically select ``SALE_INPUT`` as the 'Policy
               Trigger Event' for our policy.

            .. container:: imageblock

               .. container:: content

                  |Create a state|

               .. container:: title

                  Figure 15. Create a new State

            .. container:: paragraph

               In this case we will create a reference the pre-existing
               ``MorningBoozeCheck`` task that we defined above using
               the 'Add New Task' button. Select the
               ``MorningBoozeCheck`` task, and use the name of the task
               as the 'Local Name' for the task.

            .. container:: paragraph

               in the case where a state references more than one task,
               a 'Default Task' must be selected for the state and some
               logic ('Task Selection Logic') must be specified to
               select the appropriate task at execution time. Since our
               new state ``BoozeAuthDecide`` only has one task the
               default task is automatically selected and no 'Task
               Selection Logic' is required.

            .. note::
               .. container:: title

                  State Output Mappings

               .. container:: paragraph

                  In a 'Policy' 'State' a 'State Output Mapping' has 3 roles:
                  1) Select which 'State' should be executed next, 2) Select
                  the type of the state’s 'Outgoing Event', and 3)
                  Populate the state’s 'Outgoing Event'. This is how states are
                  chained together to form a (`Directed Acyclic Graph
                  (DAG) <https://en.wikipedia.org/wiki/Directed_acyclic_graph>`__ )
                  of states. The final state(s) of a policy are those that do
                  not select any 'next' state. Since a 'State' can only
                  accept a single type of event, the type of the event emitted
                  by a previous 'State' must be match the incoming event type
                  of the next 'State'. This is also how the last state(s) in
                  a policy can emit events of different types. The 'State
                  Output Mapping' is also responsible for taking the
                  fields that are output by the task executed in the state and
                  populating the state’s output event before it is emitted.

               .. container:: paragraph

                  Each 'Task' referenced in 'State' must have a defined
                  'Output Mapping' to take the output of the task, select an
                  'Outgoing Event' type for the state, populate the state’s
                  outgoing event, and then select the next state to be
                  executed (if any).

               .. container:: paragraph

               There are 2 basic types of output mappings:

               .. container:: olist arabic

               #. **Direct Output Mappings** have a single value for
                  'Next State' and a single value for 'State Output
                  Event'. The outgoing event for the state is
                  automatically created, any outgoing event parameters
                  that were present in the incoming event are copied
                  into the outgoing event, then any task output fields
                  that have the same name and type as parameters in the
                  outgoing event are automatically copied into
                  the outgoing event.

               #. **Logic-based State Output Mappings / Finalizers**
                  have some logic defined that dynamically selects
                  and creates the 'State Outgoing Event', manages
                  the population of the outgoing event parameters
                  (perhaps changing or adding to the outputs from the
                  task), and then dynamically selects the next state to
                  be executed (if any).

            .. container:: paragraph

               Each task reference must also have an associated 'Output
               State Mapping' so we need an 'Output State Mapping' for
               the ``BoozeAuthDecide`` state to use when the
               ``MorningBoozeCheck`` task is executed. The simplest type
               of output mapping is a 'Direct Output Mapping'.

            .. container:: paragraph

               Create a new 'Direct Output Mapping' for the state called
               ``MorningBoozeCheck_Output_Direct`` using the 'Add New
               Direct State Output Mapping' button. Select ``SALE_AUTH``
               as the output event and select ``None`` for the next
               state value. We can then select this output mapping for
               use when the the ``MorningBoozeCheck`` task is executed.
               Since there is only state, and only one task for that
               state, this output mapping ensures that the
               ``BoozeAuthDecide`` state is the only state executed and
               the state (and the policy) can only emit events of type
               ``SALE_AUTH``. (You may remember that the output fields
               for the ``MorningBoozeCheck`` task have the exact same
               names and reuse the item schemas that we used for the
               parameters in ``SALE_AUTH`` event. The
               ``MorningBoozeCheck_Output_Direct`` direct output mapping
               can now automatically copy the values from the
               ``MorningBoozeCheck`` task directly into outgoing
               ``SALE_AUTH`` events.)

            .. container:: imageblock

               .. container:: content

                  |Add a Task and Output Mapping|

               .. container:: title

                  Figure 16. Add a Task and Output Mapping

            .. container:: paragraph

               Click the 'Submit' button to complete the definition of
               our ``MyFirstPolicy`` policy. The policy
               ``MyFirstPolicy`` can now be seen in the list of policies
               on the 'Policies' tab, and can be updated at any time by
               right-clicking on the policy on the 'Policies' tab.

            .. container:: paragraph

               The ``MyFirstPolicyModel``, including our
               ``MyFirstPolicy`` policy can now be checked for errors.
               Click on the 'Model' menu and select 'Validate'. The
               model should validate without any 'Warning' or 'Error'
               messages. If you see any 'Error' or 'Warning' messages,
               carefully read the message as a hint to find where you
               might have made a mistake when defining some aspect of
               your policy model.

            .. container:: imageblock

               .. container:: content

                  |Validate the policy model for error using the 'Model'
                  > 'Validate' menu item|

               .. container:: title

                  Figure 17. Validate a Policy Model

            .. container:: paragraph

               Congratulations, you have now completed your first APEX
               policy. The policy model containing our new policy can
               now be exported from the editor and saved. Click on the
               'File' menu and select 'Download' to save the policy
               model in JSON format. The exported policy model is then
               available in the directory you selected, for instance
               ``$APEX_HOME/examples/models/MyFirstPolicy/1/MyFirstPolicyModel_0.0.1.json``.
               The exported policy can now be loaded into the APEX
               Policy Engine, or can be re-loaded and edited by the APEX
               Policy Editor.

            .. container:: imageblock

               .. container:: content

                  |Download the completed policy model using the 'File'
                  > 'Download' menu item|

               .. container:: title

                  Figure 18. Export a Policy Model

Test Policy Step 1
##################

            .. container:: paragraph

               To start a new APEX Engine you can use the following
               configuration. In a full APEX installation you can find
               this configuration in
               ``$APEX_HOME/examples/config/MyFirstPolicy/1/MyFirstPolicyConfigStdin2StdoutJsonEvent.json``.
               This configuration expects incoming events to be in
               ``JSON`` format and to be passed into the APEX Engine
               from ``stdin``, and result events will be printed in
               ``JSON`` format to ``stdout``. This configuration loads
               the policy model stored in the file
               'MyFirstPolicyModel_0.0.1.json' as exported from the APEX
               Editor. Note, you may need to edit this file to provide
               the full path to wherever you stored the exported policy
               model file.

            .. container:: listingblock

               .. container:: title

                  JSON to load and execute *My First Policy*, read input
                  JSON events from ``stdin``, and emit output events to
                  ``stdout``

               .. container:: content

                  .. code::

                     {
                         "engineServiceParameters" : {
                             "name"                : "MyFirstPolicyApexEngine",
                             "version"             : "0.0.1",
                             "id"                  : 101,
                             "instanceCount"       : 4,
                             "deploymentPort"      : 12345,
                             "policyModelFileName" : "examples/models/MyFirstPolicy/1/MyFirstPolicyModel_0.0.1.json",
                             "engineParameters"    : {
                                 "executorParameters" : {
                                     "MVEL" : {
                                         "parameterClassName" : "org.onap.policy.apex.plugins.executor.mvel.MVELExecutorParameters"
                                     },
                                     "JAVASCRIPT" : {
                                         "parameterClassName" : "org.onap.policy.apex.plugins.executor.javascript.JavascriptExecutorParameters"
                                     }
                                 }
                             }
                         },
                         "eventOutputParameters": {
                             "FirstProducer": {
                                 "carrierTechnologyParameters" : {
                                     "carrierTechnology" : "FILE",
                                     "parameters" : {
                                         "standardIO" : true
                                     }
                                 },
                                 "eventProtocolParameters" : {
                                     "eventProtocol" : "JSON"
                                 }
                             }
                         },
                         "eventInputParameters": {
                             "FirstConsumer": {
                                 "carrierTechnologyParameters" : {
                                     "carrierTechnology" : "FILE",
                                     "parameters" : {
                                         "standardIO" : true
                                     }
                                 },
                                 "eventProtocolParameters" : {
                                     "eventProtocol" : "JSON"
                                 }
                             }
                         }
                     }

            .. container:: paragraph

               To test the policy try paste the following events into
               the console as the APEX engine executes:

            .. table:: Table 11. Inputs and Outputs when testing *My First Policy*

               +------------------------------------------+-------------------------------------------+-----------+
               | Input Event (JSON)                       | Output Event (JSON)                       | comment   |
               +==========================================+===========================================+===========+
               | .. container::                           | .. container::                            | Request   |
               |                                          |                                           | to buy a  |
               |    .. container:: listingblock           |    .. container:: listingblock            | non-alcoh |
               |                                          |                                           | olic      |
               |                                          |       .. container:: content              | item      |
               |       .. container:: content             |                                           | (``item_I |
               |                                          |          .. code::                        | D=5123``) |
               |                                          |                                           | at        |
               |          .. code::                       |             {                             | *10:13:09 |
               |                                          |               "name": "SALE_AUTH",        | *         |
               |                                          |                                           | on        |
               |             {                            |               "version": "0.0.1",         | *Tuesday, |
               |               "nameSpace": "com.hyperm", |               "nameSpace": "com.hyperm",  | 10        |
               |               "name" : "SALE_INPUT",     |               "source": "",               | January   |
               |               "version": "0.0.1",        |               "target": "",               | 2017*.    |
               |               "time" : 1483351989000,    |               "amount": 299,              | Sale is   |
               |               "sale_ID": 99999991,       |               "assistant_ID": 23,         | authorize |
               |               "amount": 299,             |               "authorised": true,         | d.        |
               |               "item_ID": 5123,           |               "branch_ID": 1,             |           |
               |               "quantity": 1,             |               "item_ID": 5123,            |           |
               |               "assistant_ID": 23,        |               "message": "Sale authorised |           |
               |               "branch_ID": 1,            |                by policy task MorningBo   |           |
               |               "notes": "Special Offer!!" |                ozeCheck for time 10:13:09 |           |
               |              }                           |                GMT",                      |           |
               |                                          |               "notes": "Special Offer!!", |           |
               |                                          |               "quantity": 1,              |           |
               |                                          |               "sale_ID": 99999991,        |           |
               |                                          |               "time": 1483351989000       |           |
               |                                          |             }                             |           |
               |                                          |                                           |           |
               |                                          |                                           |           |
               |                                          |                                           |           |
               +------------------------------------------+-------------------------------------------+-----------+
               | .. container::                           | .. container::                            | Request   |
               |                                          |                                           | to buy    |
               |    .. container:: listingblock           |    .. container:: listingblock            | alcohol   |
               |                                          |                                           | item      |
               |       .. container:: content             |       .. container:: content              | (``item_I |
               |                                          |                                           | D=1249``) |
               |          .. code::                       |          .. code::                        | at        |
               |                                          |                                           | *08:41:06 |
               |             {                            |             {                             | *         |
               |               "nameSpace": "com.hyperm", |               "nameSpace": "com.hyperm",  | on        |
               |               "name": "SALE_INPUT",      |               "name": "SALE_AUTH",        | *Monday,  |
               |               "version": "0.0.1",        |               "source": "",               | 02        |
               |                "time": 1483346466000,    |               "target": "",               | January   |
               |               "sale_ID": 99999992,       |               "amount": 1249,             | 2017*.    |
               |               "version": "0.0.1",        |               "assistant_ID": 12,         |           |
               |               "amount": 1249,            |               "authorised": false,        | Sale is   |
               |               "item_ID": 1012,           |               "branch_ID": 2,             | not       |
               |               "quantity": 1,             |               "item_ID": 1012,            | authorize |
               |               "assistant_ID": 12,        |               "message": "Sale not        | d.        |
               |               "branch_ID": 2             |                authorised by policy task  |           |
               |             }                            |                MorningBoozeCheck for time |           |
               |                                          |                08:41:06 GMT. Alcohol can  |           |
               |                                          |                not be sold between        |           |
               |                                          |                00:00:00 GMT and 11:30:00  |           |
               |                                          |                GMT",                      |           |
               |                                          |               "notes": null,              |           |
               |                                          |               "quantity": 1,              |           |
               |                                          |               "sale_ID": 99999992,        |           |
               |                                          |               "time": 1483346466000       |           |
               |                                          |             }                             |           |
               +------------------------------------------+-------------------------------------------+-----------+
               | .. container::                           | .. container::                            | Request   |
               |                                          |                                           | to buy    |
               |    .. container:: listingblock           |    .. container:: listingblock            | alcohol   |
               |                                          |                                           | (``item_I |
               |                                          |       .. container:: content              | D=1943``) |
               |       .. container:: content             |                                           | at        |
               |                                          |          .. code::                        | *20:17:13 |
               |                                          |                                           | *         |
               |          .. code::                       |             {                             | on        |
               |                                          |               "name": "SALE_AUTH",        | *Tuesday, |
               |             {                            |               "version": "0.0.1",         | 20        |
               |               "nameSpace": "com.hyperm", |               "nameSpace": "com.hyperm",  | December  |
               |               "name" : "SALE_INPUT",     |               "source": "",               | 2016*.    |
               |               "version": "0.0.1",        |               "target": "",               |           |
               |               "time" : 1482265033000,    |               "amount": 4799,             | Sale is   |
               |               "sale_ID": 99999993,       |               "assistant_ID": 9,          | authorize |
               |               "amount": 4799,            |               "authorised": true,         | d.        |
               |               "item_ID": 1943,           |               "branch_ID": 3,             |           |
               |               "quantity": 2,             |               "item_ID": 1943,            |           |
               |               "assistant_ID": 9,         |               "message": "Sale authorised |           |
               |               "branch_ID": 3             |                by policy task MorningBo   |           |
               |             }                            |                ozeCheck for time 20:17:13 |           |
               |                                          |                GMT",                      |           |
               |                                          |                "notes": null,             |           |
               |                                          |                "quantity": 2,             |           |
               |                                          |                "sale_ID": 99999993,       |           |
               |                                          |                "time": 1482265033000      |           |
               |                                          |             }                             |           |
               +------------------------------------------+-------------------------------------------+-----------+

4.3.6. Policy 1 in CLI Editor
#############################

            .. container:: paragraph

               An equivalent version of the ``MyFirstPolicyModel``
               policy model can again be generated using the APEX CLI
               editor. A sample APEX CLI script is shown below:

            .. container:: listingblock

               .. container:: title

                  APEX CLI Editor code for Policy 1

               .. container:: content

                  .. code::

                     #-------------------------------------------------------------------------------
                     # ============LICENSE_START=======================================================
                     #  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                     # ================================================================================
                     # Licensed under the Apache License, Version 2.0 (the "License");
                     # you may not use this file except in compliance with the License.
                     # You may obtain a copy of the License at
                     #
                     #      http://www.apache.org/licenses/LICENSE-2.0
                     #
                     # Unless required by applicable law or agreed to in writing, software
                     # distributed under the License is distributed on an "AS IS" BASIS,
                     # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                     # See the License for the specific language governing permissions and
                     # limitations under the License.
                     #
                     # SPDX-License-Identifier: Apache-2.0
                     # ============LICENSE_END=========================================================
                     #-------------------------------------------------------------------------------

                     model create name=MyFirstPolicyModel version=0.0.1 uuid=540226fb-55ee-4f0e-a444-983a0494818e description="This is my first Apex Policy Model."

                     schema create name=assistant_ID_type version=0.0.1 uuid=36df4c71-9616-4206-8b53-976a5cd4bd87 description="A type for 'assistant_ID' values" flavour=Java schema=java.lang.Long

                     schema create name=authorised_type version=0.0.1 uuid=d48b619e-d00d-4008-b884-02d76ea4350b description="A type for 'authorised' values" flavour=Java schema=java.lang.Boolean

                     schema create name=branch_ID_type version=0.0.1 uuid=6468845f-4122-4128-8e49-0f52c26078b5 description="A type for 'branch_ID' values" flavour=Java schema=java.lang.Long

                     schema create name=item_ID_type version=0.0.1 uuid=4f227ff1-aee0-453a-b6b6-9a4b2e0da932 description="A type for 'item_ID' values" flavour=Java schema=java.lang.Long

                     schema create name=message_type version=0.0.1 uuid=ad1431bb-3155-4e73-b5a3-b89bee498749 description="A type for 'message' values" flavour=Java schema=java.lang.String

                     schema create name=notes_type version=0.0.1 uuid=eecfde90-896c-4343-8f9c-2603ced94e2d description="A type for 'notes' values" flavour=Java schema=java.lang.String

                     schema create name=price_type version=0.0.1 uuid=52c2fc45-fd8c-463c-bd6f-d91b0554aea7 description="A type for 'amount'/'price' values" flavour=Java schema=java.lang.Long

                     schema create name=quantity_type version=0.0.1 uuid=ac3d9842-80af-4a98-951c-bd79a431c613 description="A type for 'quantity' values" flavour=Java schema=java.lang.Integer

                     schema create name=sale_ID_type version=0.0.1 uuid=cca47d74-7754-4a61-b163-ca31f66b157b description="A type for 'sale_ID' values" flavour=Java schema=java.lang.Long

                     schema create name=timestamp_type version=0.0.1 uuid=fd594e88-411d-4a94-b2be-697b3a0d7adf description="A type for 'time' values" flavour=Java schema=java.lang.Long

                     task create name=MorningBoozeCheck version=0.0.1 uuid=3351b0f4-cf06-4fa2-8823-edf67bd30223 description=LS
                     This task checks if the sales request is for an item that contains alcohol.
                     If the local time is between 00:00:00 and 11:30:00 then the sale is not authorised. Otherwise the sale is authorised.
                     In this implementation we assume that all items with item_ID values between 1000 and 2000 contain alcohol :-)
                     LE
                     task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=amount schemaName=price_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true
                     task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=quantity schemaName=quantity_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=item_ID schemaName=item_ID_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=time schemaName=timestamp_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=amount schemaName=price_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=quantity schemaName=quantity_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=item_ID schemaName=item_ID_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=authorised schemaName=authorised_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=time schemaName=timestamp_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=message schemaName=message_type schemaVersion=0.0.1 optional=true
                     task logic create name=MorningBoozeCheck version=0.0.1 logicFlavour=MVEL logic=LS
                     /*
                      * ============LICENSE_START=======================================================
                      *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                      * ================================================================================
                      * Licensed under the Apache License, Version 2.0 (the "License");
                      * you may not use this file except in compliance with the License.
                      * You may obtain a copy of the License at
                      *
                      *      http://www.apache.org/licenses/LICENSE-2.0
                      *
                      * Unless required by applicable law or agreed to in writing, software
                      * distributed under the License is distributed on an "AS IS" BASIS,
                      * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                      * See the License for the specific language governing permissions and
                      * limitations under the License.
                      *
                      * SPDX-License-Identifier: Apache-2.0
                      * ============LICENSE_END=========================================================
                      */
                     import java.util.Date;
                     import java.util.Calendar;
                     import java.util.TimeZone;
                     import java.text.SimpleDateFormat;

                     logger.info("Task Execution: '"+subject.id+"'. Input Fields: '"+inFields+"'");

                     outFields.put("amount"      , inFields.get("amount"));
                     outFields.put("assistant_ID", inFields.get("assistant_ID"));
                     outFields.put("notes"       , inFields.get("notes"));
                     outFields.put("quantity"    , inFields.get("quantity"));
                     outFields.put("branch_ID"   , inFields.get("branch_ID"));
                     outFields.put("item_ID"     , inFields.get("item_ID"));
                     outFields.put("time"        , inFields.get("time"));
                     outFields.put("sale_ID"     , inFields.get("sale_ID"));

                     item_id = inFields.get("item_ID");

                     //The events used later to test this task use GMT timezone!
                     gmt = TimeZone.getTimeZone("GMT");
                     timenow = Calendar.getInstance(gmt);
                     df = new SimpleDateFormat("HH:mm:ss z");
                     df.setTimeZone(gmt);
                     timenow.setTimeInMillis(inFields.get("time"));

                     midnight = timenow.clone();
                     midnight.set(
                         timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH),
                         timenow.get(Calendar.DATE),0,0,0);
                     eleven30 = timenow.clone();
                     eleven30.set(
                         timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH),
                         timenow.get(Calendar.DATE),11,30,0);

                     itemisalcohol = false;
                     if(item_id != null && item_id >=1000 && item_id < 2000)
                         itemisalcohol = true;

                     if( itemisalcohol
                         && timenow.after(midnight) && timenow.before(eleven30)){
                       outFields.put("authorised", false);
                       outFields.put("message", "Sale not authorised by policy task "+subject.taskName+
                         " for time "+df.format(timenow.getTime())+
                         ". Alcohol can not be sold between "+df.format(midnight.getTime())+
                         " and "+df.format(eleven30.getTime()));
                       return true;
                     }
                     else{
                       outFields.put("authorised", true);
                       outFields.put("message", "Sale authorised by policy task "+subject.taskName+
                         " for time "+df.format(timenow.getTime()));
                       return true;
                     }

                     /*
                     This task checks if a sale request is for an item that is an alcoholic drink.
                     If the local time is between 00:00:00 GMT and 11:30:00 GMT then the sale is not
                     authorised. Otherwise the sale is authorised.
                     In this implementation we assume that items with item_ID value between 1000 and
                     2000 are all alcoholic drinks :-)
                     */
                     LE

                     event create name=SALE_AUTH version=0.0.1 uuid=c4500941-3f98-4080-a9cc-5b9753ed050b description="An event emitted by the Policy to indicate whether the sale of an item has been authorised" nameSpace=com.hyperm source="APEX" target="POS"
                     event parameter create name=SALE_AUTH version=0.0.1 parName=amount schemaName=price_type schemaVersion=0.0.1
                     event parameter create name=SALE_AUTH version=0.0.1 parName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1
                     event parameter create name=SALE_AUTH version=0.0.1 parName=authorised schemaName=authorised_type schemaVersion=0.0.1
                     event parameter create name=SALE_AUTH version=0.0.1 parName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1
                     event parameter create name=SALE_AUTH version=0.0.1 parName=item_ID schemaName=item_ID_type schemaVersion=0.0.1
                     event parameter create name=SALE_AUTH version=0.0.1 parName=message schemaName=message_type schemaVersion=0.0.1 optional=true
                     event parameter create name=SALE_AUTH version=0.0.1 parName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true
                     event parameter create name=SALE_AUTH version=0.0.1 parName=quantity schemaName=quantity_type schemaVersion=0.0.1
                     event parameter create name=SALE_AUTH version=0.0.1 parName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1
                     event parameter create name=SALE_AUTH version=0.0.1 parName=time schemaName=timestamp_type schemaVersion=0.0.1

                     event create name=SALE_INPUT version=0.0.1 uuid=4f04aa98-e917-4f4a-882a-c75ba5a99374 description="An event raised by the PoS system each time an item is scanned for purchase" nameSpace=com.hyperm source="POS" target="APEX"
                     event parameter create name=SALE_INPUT version=0.0.1 parName=amount schemaName=price_type schemaVersion=0.0.1
                     event parameter create name=SALE_INPUT version=0.0.1 parName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1
                     event parameter create name=SALE_INPUT version=0.0.1 parName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1
                     event parameter create name=SALE_INPUT version=0.0.1 parName=item_ID schemaName=item_ID_type schemaVersion=0.0.1
                     event parameter create name=SALE_INPUT version=0.0.1 parName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true
                     event parameter create name=SALE_INPUT version=0.0.1 parName=quantity schemaName=quantity_type schemaVersion=0.0.1
                     event parameter create name=SALE_INPUT version=0.0.1 parName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1
                     event parameter create name=SALE_INPUT version=0.0.1 parName=time schemaName=timestamp_type schemaVersion=0.0.1


                     policy create name=MyFirstPolicy version=0.0.1 uuid=6c5e410f-489a-46ff-964e-982ce6e8b6d0 description="This is my first Apex policy. It checks if a sale should be authorised or not." template=FREEFORM firstState=BoozeAuthDecide
                     policy state create name=MyFirstPolicy version=0.0.1 stateName=BoozeAuthDecide triggerName=SALE_INPUT triggerVersion=0.0.1 defaultTaskName=MorningBoozeCheck defaultTaskVersion=0.0.1
                     policy state output create name=MyFirstPolicy version=0.0.1 stateName=BoozeAuthDecide outputName=MorningBoozeCheck_Output_Direct eventName=SALE_AUTH eventVersion=0.0.1 nextState=NULL
                     policy state taskref create name=MyFirstPolicy version=0.0.1 stateName=BoozeAuthDecide taskLocalName=MorningBoozeCheck taskName=MorningBoozeCheck taskVersion=0.0.1 outputType=DIRECT outputName=MorningBoozeCheck_Output_Direct

Policy Step 2
-------------

Scenario
#########
            .. container:: paragraph

               *HyperM* have just opened a new branch in a different
               country, but that country has different rules about when
               alcohol can be sold! In this section we will go through
               the necessary steps to extend our policy to enforce this
               for *HyperM*.

            .. container:: ulist

               -  In some branches alcohol cannot be sold before 1pm,
                  and not at all on Sundays.

            .. container:: paragraph

               Although there are a number of ways to accomplish this
               the easiest approach for us is to define another task and
               then select which task is appropriate at runtime
               depending on the branch identifier in the incoming event.

Extend the Policy with the new Scenario
#######################################

            .. container:: paragraph

               To create a new Task click on the 'Tasks' tab. In the
               'Tasks' pane, right click and select 'Create new Task':

            .. container:: paragraph

               Create a new Task called ``MorningBoozeCheckAlt1``. Use
               the 'Generate UUID' button to create a new unique ID for
               the task, and fill in a description for the task. Select
               the same input and output fields that we used earlier
               when we defined the ``MorningBoozeCheck`` task earlier.

            .. table:: Table 12. Input fields for ``MorningBoozeCheckAlt1`` task

               +-----------------------------------+-----------------------------------+
               | Parameter Name                    | Parameter Type                    |
               +===================================+===================================+
               | time                              | timestamp_type                    |
               +-----------------------------------+-----------------------------------+
               | sale_ID                           | sale_ID_type                      |
               +-----------------------------------+-----------------------------------+
               | amount                            | price_type                        |
               +-----------------------------------+-----------------------------------+
               | item_ID                           | item_ID_type                      |
               +-----------------------------------+-----------------------------------+
               | quantity                          | quantity_type                     |
               +-----------------------------------+-----------------------------------+
               | assistant_ID                      | assistant_ID_type                 |
               +-----------------------------------+-----------------------------------+
               | branch_ID                         | branch_ID_type                    |
               +-----------------------------------+-----------------------------------+
               | notes                             | notes_type                        |
               +-----------------------------------+-----------------------------------+

            .. table:: Table 13. Output fields for ``MorningBoozeCheckAlt1`` task

               +-----------------------------------+-----------------------------------+
               | Parameter Name                    | Parameter Type                    |
               +===================================+===================================+
               | sale_ID                           | sale_ID_type                      |
               +-----------------------------------+-----------------------------------+
               | time                              | timestamp_type                    |
               +-----------------------------------+-----------------------------------+
               | authorised                        | authorised_type                   |
               +-----------------------------------+-----------------------------------+
               | message                           | message_type                      |
               +-----------------------------------+-----------------------------------+
               | amount                            | price_type                        |
               +-----------------------------------+-----------------------------------+
               | item_ID                           | item_ID_type                      |
               +-----------------------------------+-----------------------------------+
               | assistant_ID                      | assistant_ID_type                 |
               +-----------------------------------+-----------------------------------+
               | quantity                          | quantity_type                     |
               +-----------------------------------+-----------------------------------+
               | branch_ID                         | branch_ID_type                    |
               +-----------------------------------+-----------------------------------+
               | notes                             | notes_type                        |
               +-----------------------------------+-----------------------------------+

            .. container:: paragraph

               This task also requires some 'Task Logic' to implement
               the new behaviour for this task.

            .. container:: paragraph

               For simplicity use the following code for the task logic.
               It again assumes that all items with ``item_ID`` between
               1000 and 2000 contain alcohol. We again use the standard
               ``Java`` time utilities to check if the current time is
               between ``00:00:00 CET`` and ``13:00:00 CET`` or if it is
               ``Sunday``.

            .. container:: paragraph

               For this task we will again author the logic using the
               ```MVEL`` <https://en.wikipedia.org/wiki/MVEL>`__
               scripting language. Sample task logic code (specified in
               ```MVEL`` <https://en.wikipedia.org/wiki/MVEL>`__) is
               given below. For a detailed guide to how to write your
               own logic in
               ```JavaScript`` <https://en.wikipedia.org/wiki/JavaScript>`__,
               ```MVEL`` <https://en.wikipedia.org/wiki/MVEL>`__ or one
               of the other supported languages please refer to APEX
               Programmers Guide.

            .. container:: listingblock

               .. container:: title

                  MVEL code for the ``MorningBoozeCheckAlt1`` task

               .. container:: content

                  .. code::

                     /*
                      * ============LICENSE_START=======================================================
                      *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                      * ================================================================================
                      * Licensed under the Apache License, Version 2.0 (the "License");
                      * you may not use this file except in compliance with the License.
                      * You may obtain a copy of the License at
                      *
                      *      http://www.apache.org/licenses/LICENSE-2.0
                      *
                      * Unless required by applicable law or agreed to in writing, software
                      * distributed under the License is distributed on an "AS IS" BASIS,
                      * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                      * See the License for the specific language governing permissions and
                      * limitations under the License.
                      *
                      * SPDX-License-Identifier: Apache-2.0
                      * ============LICENSE_END=========================================================
                      */
                     import java.util.Date;
                     import java.util.Calendar;
                     import java.util.TimeZone;
                     import java.text.SimpleDateFormat;

                     logger.info("Task Execution: '"+subject.id+"'. Input Event: '"+inFields+"'");

                     outFields.put("amount"      , inFields.get("amount"));
                     outFields.put("assistant_ID", inFields.get("assistant_ID"));
                     outFields.put("notes"       , inFields.get("notes"));
                     outFields.put("quantity"    , inFields.get("quantity"));
                     outFields.put("branch_ID"   , inFields.get("branch_ID"));
                     outFields.put("item_ID"     , inFields.get("item_ID"));
                     outFields.put("time"        , inFields.get("time"));
                     outFields.put("sale_ID"     , inFields.get("sale_ID"));

                     item_id = inFields.get("item_ID");

                     //The events used later to test this task use CET timezone!
                     cet = TimeZone.getTimeZone("CET");
                     timenow = Calendar.getInstance(cet);
                     df = new SimpleDateFormat("HH:mm:ss z");
                     df.setTimeZone(cet);
                     timenow.setTimeInMillis(inFields.get("time"));

                     midnight = timenow.clone();
                     midnight.set(
                         timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH),
                         timenow.get(Calendar.DATE),0,0,0);
                     onepm = timenow.clone();
                     onepm.set(
                         timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH),
                         timenow.get(Calendar.DATE),13,0,0);

                     itemisalcohol = false;
                     if(item_id != null && item_id >=1000 && item_id < 2000)
                         itemisalcohol = true;

                     if( itemisalcohol &&
                         ( (timenow.after(midnight) && timenow.before(onepm))
                           ||
                           (timenow.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY)
                         )){
                       outFields.put("authorised", false);
                       outFields.put("message", "Sale not authorised by policy task "+subject.taskName+
                         " for time "+df.format(timenow.getTime())+
                         ". Alcohol can not be sold between "+df.format(midnight.getTime())+
                         " and "+df.format(onepm.getTime()) +" or on Sunday");
                       return true;
                     }
                     else{
                       outFields.put("authorised", true);
                       outFields.put("message", "Sale authorised by policy task "+subject.taskName+
                         " for time "+df.format(timenow.getTime()));
                       return true;
                     }

                     /*
                     This task checks if a sale request is for an item that is an alcoholic drink.
                     If the local time is between 00:00:00 CET and 13:00:00 CET then the sale is not authorised.
                     Also alcohol sales are not allowed on Sundays. Otherwise the sale is authorised.
                     In this implementation we assume that items with item_ID between 1000 and 2000 are all alcoholic drinks :-)
                     */

            .. container:: imageblock

               .. container:: content

                  |Create a new alternative task MorningBoozeCheckAlt1|

               .. container:: title

                  Figure 19. Create a new Task

            .. container:: paragraph

               The task definition is now complete so click the 'Submit'
               button to save the task. Now that we have created our
               task, we can can add this task to the single pre-existing
               state (``BoozeAuthDecide``) in our policy.

            .. container:: paragraph

               To edit the ``BoozeAuthDecide`` state in our policy click
               on the 'Policies' tab. In the 'Policies' pane, right
               click on our ``MyFirstPolicy`` policy and select 'Edit'.
               Navigate to the ``BoozeAuthDecide`` state in the 'states'
               section at the bottom of the policy definition pane.

            .. container:: imageblock

               .. container:: content

                  |Right click to edit a policy|

               .. container:: title

                  Figure 20. Edit a Policy

            .. container:: paragraph

               To add our new task ``MorningBoozeCheckAlt1``, scroll
               down to the ``BoozeAuthDecide`` state in the 'States'
               section. In the 'State Tasks' section for
               ``BoozeAuthDecide`` use the 'Add new task' button. Select
               our new ``MorningBoozeCheckAlt1`` task, and use the name
               of the task as the 'Local Name' for the task. The
               ``MorningBoozeCheckAlt1`` task can reuse the same
               ``MorningBoozeCheck_Output_Direct`` 'Direct State Output
               Mapping' that we used for the ``MorningBoozeCheck`` task.
               (Recall that the role of the 'State Output Mapping' is to
               select the output event for the state, and select the
               next state to be executed. These both remain the same as
               before.)

            .. container:: paragraph

               Since our state has more than one task we must define
               some logic to determine which task should be used each
               time the state is executed. This *task selection logic*
               is defined in the state definition. For our
               ``BoozeAuthDecide`` state we want the choice of which
               task to use to be based on the ``branch_ID`` from which
               the ``SALE_INPUT`` event originated. For simplicity sake
               let us assume that branches with ``branch_ID`` between
               ``0`` and ``999`` should use the ``MorningBoozeCheck``
               task, and the branches with with ``branch_ID`` between
               ``1000`` and ``1999`` should use the
               ``MorningBoozeCheckAlt1`` task.

            .. container:: paragraph

               This time, for variety, we will author the task selection
               logic using the
               ```JavaScript`` <https://en.wikipedia.org/wiki/JavaScript>`__
               scripting language. Sample task selection logic code
               (specified in
               ```JavaScript`` <https://en.wikipedia.org/wiki/JavaScript>`__)
               is given below. Paste the script text into the 'Task
               Selection Logic' box, and use "JAVASCRIPT" as the 'Task
               Selection Logic Type / Flavour'. It is necessary to mark
               one of the tasks as the 'Default Task' so that the task
               selection logic always has a fallback default option in
               cases where a particular task cannot be selected. In this
               case the ``MorningBoozeCheck`` task can be the default
               task.

            .. container:: listingblock

               .. container:: title

                  JavaScript code for the ``BoozeAuthDecide`` task
                  selection logic

               .. container:: content

                  .. code::

                     /*
                      * ============LICENSE_START=======================================================
                      *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                      * ================================================================================
                      * Licensed under the Apache License, Version 2.0 (the "License");
                      * you may not use this file except in compliance with the License.
                      * You may obtain a copy of the License at
                      *
                      *      http://www.apache.org/licenses/LICENSE-2.0
                      *
                      * Unless required by applicable law or agreed to in writing, software
                      * distributed under the License is distributed on an "AS IS" BASIS,
                      * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                      * See the License for the specific language governing permissions and
                      * limitations under the License.
                      *
                      * SPDX-License-Identifier: Apache-2.0
                      * ============LICENSE_END=========================================================
                      */


                     var returnValueType = Java.type("java.lang.Boolean");
                     var returnValue = new returnValueType(true);

                     executor.logger.info("Task Selection Execution: '"+executor.subject.id+
                         "'. Input Event: '"+executor.inFields+"'");

                     branchid = executor.inFields.get("branch_ID");
                     taskorig = executor.subject.getTaskKey("MorningBoozeCheck");
                     taskalt = executor.subject.getTaskKey("MorningBoozeCheckAlt1");
                     taskdef = executor.subject.getDefaultTaskKey();

                     if(branchid >=0 && branchid <1000){
                       taskorig.copyTo(executor.selectedTask);
                     }
                     else if (branchid >=1000 && branchid <2000){
                       taskalt.copyTo(executor.selectedTask);
                     }
                     else{
                       taskdef.copyTo(executor.selectedTask);
                     }

                     /*
                     This task selection logic selects task "MorningBoozeCheck" for branches with
                     0<=branch_ID<1000 and selects task "MorningBoozeCheckAlt1" for branches with
                     1000<=branch_ID<2000. Otherwise the default task is selected.
                     In this case the default task is also "MorningBoozeCheck"
                     */

            .. container:: imageblock

               .. container:: content

                  |State definition with 2 Tasks and Task Selection
                  Logic|

               .. container:: title

                  Figure 21. State definition with 2 Tasks and Task
                  Selection Logic

            .. container:: paragraph

               When complete don’t forget to click the 'Submit' button
               at the bottom of 'Policies' pane for our
               ``MyFirstPolicy`` policy after updating the
               ``BoozeAuthDecide`` state.

            .. container:: paragraph

               Congratulations, you have now completed the second step
               towards your first APEX policy. The policy model
               containing our new policy can again be validated and
               exported from the editor and saved as shown in Step 1.

            .. container:: paragraph

               The exported policy model is then available in the
               directory you selected, as
               `MyFirstPolicyModel_0.0.1.json <files/mfp-files/2/MyFirstPolicyModel_0.0.1.json>`__.
               The exported policy can now be loaded into the APEX
               Policy Engine, or can be re-loaded and edited by the APEX
               Policy Editor.

Test Policy Step 2
##################

            .. container:: paragraph

               To start a new APEX Engine you can use the following
               configuration. In a full APEX installation you can find
               this configuration in
               ``$APEX_HOME/examples/config/MyFirstPolicy/2/MyFirstPolicyConfigStdin2StdoutJsonEvent.json``.
               Note, this has changed from the configuration file in
               Step 1 to enable the ``JAVASCRIPT`` executor for our new
               'Task Selection Logic'.

            .. container:: listingblock

               .. container:: title

                  JSON to load and execute *My First Policy*, read input
                  JSON events from ``stdin``, and emit output events to
                  ``stdout``

               .. container:: content

                  .. code::

                     {
                         "engineServiceParameters" : {
                             "name"                : "MyFirstPolicyApexEngine",
                             "version"             : "0.0.1",
                             "id"                  : 102,
                             "instanceCount"       : 4,
                             "deploymentPort"      : 12345,
                             "policyModelFileName" : "examples/models/MyFirstPolicy/2/MyFirstPolicyModel_0.0.1.json",
                             "engineParameters"    : {
                                 "executorParameters" : {
                                     "MVEL" : {
                                         "parameterClassName" : "org.onap.policy.apex.plugins.executor.mvel.MVELExecutorParameters"
                                     },
                                     "JAVASCRIPT" : {
                                         "parameterClassName" : "org.onap.policy.apex.plugins.executor.javascript.JavascriptExecutorParameters"
                                     }
                                 }
                             }
                         },
                         "eventOutputParameters": {
                             "FirstProducer": {
                                 "carrierTechnologyParameters" : {
                                     "carrierTechnology" : "FILE",
                                     "parameters" : {
                                         "standardIO" : true
                                     }
                                 },
                                 "eventProtocolParameters" : {
                                     "eventProtocol" : "JSON"
                                 }
                             }
                         },
                         "eventInputParameters": {
                             "FirstConsumer": {
                                 "carrierTechnologyParameters" : {
                                     "carrierTechnology" : "FILE",
                                     "parameters" : {
                                         "standardIO" : true
                                     }
                                 },
                                 "eventProtocolParameters" : {
                                     "eventProtocol" : "JSON"
                                 }
                             }
                         }
                     }

            .. container:: paragraph

               To test the policy try paste the following events into
               the console as the APEX engine executes. Note, all tests
               from Step 1 will still work perfectly since none of those
               events originate from a branch with ``branch_ID`` between
               ``1000`` and ``2000``. The 'Task Selection Logic' will
               therefore pick the ``MorningBoozeCheck`` task as
               expected, and will therefore give the same results.

            .. table:: Table 14. Inputs and Outputs when testing *My First Policy*

               +----------------------------------------------+------------------------------------------------------------+---------------------------+
               | Input Event (JSON)                           | Output Event (JSON)                                        | comment                   |
               +==============================================+============================================================+===========================+
               | .. container::                               | .. container::                                             | Request to buy            |
               |                                              |                                                            | alcohol item              |
               |    .. container:: listingblock               |    .. container:: listingblock                             | (``item_ID=1249``)        |
               |                                              |                                                            |                           |
               |                                              |                                                            | at *08:41:06              |
               |                                              |       .. container:: content                               | GMT* on *Monday,          |
               |       .. container:: content                 |                                                            | 02 January                |        
               |                                              |          .. code::                                         | 2017*.                    |
               |                                              |                                                            |                           |
               |                                              |             {                                              | Sale is not               |    
               |          .. code::                           |               "nameSpace": "com.hyperm",                   | authorized. Uses          |
               |                                              |               "name": "SALE_AUTH",                         | the                       |
               |                                              |               "version": "0.0.1",                          | ``MorningBoozeCheck``     |
               |             {                                |               "source": "",                                |                           |
               |               "nameSpace": "com.hyperm",     |               "target": "",                                | task.                     |     
               |               "name": "SALE_INPUT",          |               "amount": 1249,                              |                           |
               |                "version": "0.0.1",           |               "assistant_ID":12,                           | Note this test            |
               |               "time": 1483346466000,         |               "authorised": false,                         | is copied from            |
               |               "sale_ID": 99999992,           |               "branch_ID": 2,                              | Step 1 above,             |
               |               "amount": 1249,                |               "item_ID": 1012,                             | and demonstrates          |    
               |               "item_ID": 1012,               |               "message": "Sale not authorised by policy ta | that the                  |
               |               "quantity": 1,                 |                sk MorningBoozeCheck for time 08:41:06  GMT.| original                  |
               |               "assistant_ID": 12,            |                Alcohol can not be sold between 00:00:00    | ``MorningBoozeCheck``     |
               |               "branch_ID": 2                 |                GMT and 11:30:00 GMT",                      |                           |
               |              }                               |               "notes": null,                               | task is                   |
               |                                              |               "quantity": 1,                               | executed.                 |    
               |                                              |               "sale_ID": 99999992,                         |                           |
               |                                              |               "time": 1483346466000                        |                           |
               |                                              |             }                                              |                           |
               +----------------------------------------------+------------------------------------------------------------+---------------------------+
               | .. container::                               | .. container::                                             | Request to buy            |
               |                                              |                                                            | alcohol                   |
               |    .. container:: listingblock               |    .. container:: listingblock                             | (``item_ID=1047``)        |
               |                                              |                                                            |                           |
               |                                              |                                                            | at *10:14:33* on          |
               |                                              |       .. container:: content                               | *Thursday, 22             |
               |       .. container:: content                 |                                                            | December 2016*.           |
               |                                              |          .. code::                                         |                           |
               |                                              |                                                            | Sale is not               |
               |                                              |             {                                              | authorized. Uses          |
               |          .. code::                           |               "nameSpace" : "com.hyperm",                  | the                       |
               |                                              |               "name" : "SALE_AUTH",                        | ``MorningBoozeCheckAlt1`` |
               |                                              |               "version" : "0.0.1",                         | task.                     |
               |             {                                |               "source" : "",                               |                           |
               |                                              |               "target" : "",                               |                           |
               |               "nameSpace": "com.hyperm",     |               "sale_ID" : 99999981,                        |                           |
               |               "name": "SALE_INPUT",          |               "amount" : 299,                              |                           |
               |               "version": "0.0.1",            |               "assistant_ID": 1212,                        |                           |
               |               "time": 1482398073000,         |               "notes" : null,                              |                           |
               |               "sale_ID": 99999981,           |               "quantity" : 1,                              |                           |
               |               "amount": 299,                 |               "branch_ID" : 1002,                          |                           |
               |               "item_ID": 1047,               |               "item_ID" : 1047,                            |                           |
               |               "quantity": 1,                 |               "authorised" : false,                        |                           |
               |               "assistant_ID": 1212,          |               "time" : 1482398073000,                      |                           |
               |               "branch_ID": 1002              |               "message" : "Sale not authorised by policy t |                           |
               |             }                                |                ask MorningBoozeCheckAlt1 fortime           |                           |
               |                                              |                10:14:33 CET. Alcohol can not be sold       |                           |
               |                                              |                between 00:00:00 CET and 13:00:00 CET or on |                           |
               |                                              |                Sunday"                                     |                           |
               |                                              |             }                                              |                           |
               +----------------------------------------------+------------------------------------------------------------+---------------------------+
               | .. container::                               | .. container::                                             | Request to buy            |
               |                                              |                                                            | alcohol                   |
               |    .. container:: listingblock               |    .. container:: listingblock                             | (``item_ID=1443``)        |
               |                                              |                                                            |                           |
               |                                              |                                                            | at *17:19:37* on          |
               |                                              |       .. container:: content                               | *Sunday, 18               |
               |       .. container:: content                 |                                                            | December 2016*.           |
               |                                              |          .. code::                                         |                           |
               |                                              |                                                            | Sale is not               |
               |                                              |             {                                              | authorized. Uses          |
               |          .. code::                           |               "nameSpace" : "com.hyperm",                  | the                       |
               |                                              |                                                            | ``MorningBoozeCheckAlt1`` |
               |                                              |               "name" : "SALE_AUTH",                        | task.                     |
               |             {                                |                                                            |                           |
               |               "nameSpace": "com.hyperm",     |               "version" : "0.0.1",                         |                           |
               |               "name": "SALE_INPUT",          |               "source" : "",                               |                           |
               |               "version": "0.0.1",            |               "target" : "",                               |                           |
               |               "time": 1482077977000,         |               "sale_ID" : 99999982,                        |                           |
               |               "sale_ID": 99999982,           |               "amount" : 2199,                             |                           |
               |               "amount": 2199,                |               "assistant_ID" : 94,                         |                           |
               |               "item_ID": 1443,               |               "notes" : "Buy 3, get 1 free!!",             |                           |
               |               "quantity": 12,                |               "quantity" : 12,                             |                           |
               |               "assistant_ID": 94,            |               "branch_ID" : 1003,                          |                           |
               |               "branch_ID": 1003,             |               "item_ID" : 1443,                            |                           |
               |               "notes": "Buy 3, get 1 free!!" |               "authorised" : false,                        |                           |
               |             }                                |               "time" : 1482077977000,                      |                           |
               |                                              |               "message" : "Sale not authorised by policy t |                           |
               |                                              |                ask MorningBoozeCheckAlt1 for               |                           |
               |                                              |                time 17:19:37 CET. Alcohol c                |                           |
               |                                              |                an not be sold between 00:00:               |                           |
               |                                              |                00 CET and 13:00:00 CET or on               |                           |
               |                                              |                Sunday"                                     |                           |
               +----------------------------------------------+------------------------------------------------------------+---------------------------+
               | .. container::                               | .. container::                                             | Request to buy            |
               |                                              |                                                            | non-alcoholic             |
               |    .. container:: listingblock               |    .. container:: listingblock                             | item                      |
               |                                              |                                                            | (``item_ID=5321``)        |
               |                                              |                                                            |                           |
               |                                              |       .. container:: content                               | at *11:13:09* on          |
               |       .. container:: content                 |                                                            | *Monday, 2                |
               |                                              |          .. code::                                         | January 2017*.            |
               |                                              |                                                            |                           |
               |                                              |             {                                              | Sale is                   |
               |          .. code::                           |               "nameSpace" : "com.hyperm",                  | authorized. Uses          |
               |                                              |               "name" : "SALE_AUTH",                        | the                       |
               |             {                                |               "version" : "0.0.1",                         | ``MorningBoozeCheckAlt1`` |
               |                "nameSpace": "com.hyperm",    |               "source" : "",                               | task.                     |
               |                "name": "SALE_INPUT",         |               "target" : "",                               |                           |
               |                "version": "0.0.1",           |               "sale_ID" : 99999983,                        |                           |
               |                "time": 1483351989000,        |               "amount" : 699,                              |                           |
               |                "sale_ID": 99999983,          |               "assistant_ID" : 2323,                       |                           |
               |                "amount": 699,                |               "notes" : "",                                |                           |
               |                "item_ID": 5321,              |               "quantity" : 1,                              |                           |
               |                 "quantity": 1,               |               "branch_ID" : 1001,                          |                           |
               |                 "assistant_ID": 2323,        |               "item_ID" : 5321,                            |                           |
               |                 "branch_ID": 1001,           |               "authorised" : true,                         |                           |
               |                 "notes": ""                  |               "time" : 1483351989000,                      |                           |
               |              }                               |               "message" : "Sale authorised by policy task  |                           |
               |                                              |                MorningBoozeCheckAlt1 for time 11:13:09 CET"|                           |
               |                                              |             }                                              |                           |
               +----------------------------------------------+------------------------------------------------------------+---------------------------+

Policy 2 in CLI Editor
######################

            .. container:: paragraph

               An equivalent version of the ``MyFirstPolicyModel``
               policy model can again be generated using the APEX CLI
               editor. A sample APEX CLI script is shown below:

            .. container:: listingblock

               .. container:: title

                  APEX CLI Editor code for Policy 2

               .. container:: content

                  .. code::

                     #-------------------------------------------------------------------------------
                     # ============LICENSE_START=======================================================
                     #  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                     # ================================================================================
                     # Licensed under the Apache License, Version 2.0 (the "License");
                     # you may not use this file except in compliance with the License.
                     # You may obtain a copy of the License at
                     #
                     #      http://www.apache.org/licenses/LICENSE-2.0
                     #
                     # Unless required by applicable law or agreed to in writing, software
                     # distributed under the License is distributed on an "AS IS" BASIS,
                     # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                     # See the License for the specific language governing permissions and
                     # limitations under the License.
                     #
                     # SPDX-License-Identifier: Apache-2.0
                     # ============LICENSE_END=========================================================
                     #-------------------------------------------------------------------------------

                     model create name=MyFirstPolicyModel version=0.0.1 uuid=540226fb-55ee-4f0e-a444-983a0494818e description="This is my first Apex Policy Model."

                     schema create name=assistant_ID_type version=0.0.1 uuid=36df4c71-9616-4206-8b53-976a5cd4bd87 description="A type for 'assistant_ID' values" flavour=Java schema=java.lang.Long

                     schema create name=authorised_type version=0.0.1 uuid=d48b619e-d00d-4008-b884-02d76ea4350b description="A type for 'authorised' values" flavour=Java schema=java.lang.Boolean

                     schema create name=branch_ID_type version=0.0.1 uuid=6468845f-4122-4128-8e49-0f52c26078b5 description="A type for 'branch_ID' values" flavour=Java schema=java.lang.Long

                     schema create name=item_ID_type version=0.0.1 uuid=4f227ff1-aee0-453a-b6b6-9a4b2e0da932 description="A type for 'item_ID' values" flavour=Java schema=java.lang.Long

                     schema create name=message_type version=0.0.1 uuid=ad1431bb-3155-4e73-b5a3-b89bee498749 description="A type for 'message' values" flavour=Java schema=java.lang.String

                     schema create name=notes_type version=0.0.1 uuid=eecfde90-896c-4343-8f9c-2603ced94e2d description="A type for 'notes' values" flavour=Java schema=java.lang.String

                     schema create name=price_type version=0.0.1 uuid=52c2fc45-fd8c-463c-bd6f-d91b0554aea7 description="A type for 'amount'/'price' values" flavour=Java schema=java.lang.Long

                     schema create name=quantity_type version=0.0.1 uuid=ac3d9842-80af-4a98-951c-bd79a431c613 description="A type for 'quantity' values" flavour=Java schema=java.lang.Integer

                     schema create name=sale_ID_type version=0.0.1 uuid=cca47d74-7754-4a61-b163-ca31f66b157b description="A type for 'sale_ID' values" flavour=Java schema=java.lang.Long

                     schema create name=timestamp_type version=0.0.1 uuid=fd594e88-411d-4a94-b2be-697b3a0d7adf description="A type for 'time' values" flavour=Java schema=java.lang.Long

                     task create name=MorningBoozeCheck version=0.0.1 uuid=3351b0f4-cf06-4fa2-8823-edf67bd30223 description=LS
                     This task checks if the sales request is for an item that contains alcohol.
                     If the local time is between 00:00:00 and 11:30:00 then the sale is not authorised. Otherwise the sale is authorised.
                     In this implementation we assume that all items with item_ID values between 1000 and 2000 contain alcohol :-)
                     LE
                     task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=amount schemaName=price_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true
                     task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=quantity schemaName=quantity_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=item_ID schemaName=item_ID_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheck version=0.0.1 fieldName=time schemaName=timestamp_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=amount schemaName=price_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=quantity schemaName=quantity_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=item_ID schemaName=item_ID_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=authorised schemaName=authorised_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=time schemaName=timestamp_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheck version=0.0.1 fieldName=message schemaName=message_type schemaVersion=0.0.1 optional=true
                     task logic create name=MorningBoozeCheck version=0.0.1 logicFlavour=MVEL logic=LS
                     /*
                      * ============LICENSE_START=======================================================
                      *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                      * ================================================================================
                      * Licensed under the Apache License, Version 2.0 (the "License");
                      * you may not use this file except in compliance with the License.
                      * You may obtain a copy of the License at
                      *
                      *      http://www.apache.org/licenses/LICENSE-2.0
                      *
                      * Unless required by applicable law or agreed to in writing, software
                      * distributed under the License is distributed on an "AS IS" BASIS,
                      * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                      * See the License for the specific language governing permissions and
                      * limitations under the License.
                      *
                      * SPDX-License-Identifier: Apache-2.0
                      * ============LICENSE_END=========================================================
                      */
                     import java.util.Date;
                     import java.util.Calendar;
                     import java.util.TimeZone;
                     import java.text.SimpleDateFormat;

                     logger.info("Task Execution: '"+subject.id+"'. Input Fields: '"+inFields+"'");

                     outFields.put("amount"      , inFields.get("amount"));
                     outFields.put("assistant_ID", inFields.get("assistant_ID"));
                     outFields.put("notes"       , inFields.get("notes"));
                     outFields.put("quantity"    , inFields.get("quantity"));
                     outFields.put("branch_ID"   , inFields.get("branch_ID"));
                     outFields.put("item_ID"     , inFields.get("item_ID"));
                     outFields.put("time"        , inFields.get("time"));
                     outFields.put("sale_ID"     , inFields.get("sale_ID"));

                     item_id = inFields.get("item_ID");

                     //The events used later to test this task use GMT timezone!
                     gmt = TimeZone.getTimeZone("GMT");
                     timenow = Calendar.getInstance(gmt);
                     df = new SimpleDateFormat("HH:mm:ss z");
                     df.setTimeZone(gmt);
                     timenow.setTimeInMillis(inFields.get("time"));

                     midnight = timenow.clone();
                     midnight.set(
                         timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH),
                         timenow.get(Calendar.DATE),0,0,0);
                     eleven30 = timenow.clone();
                     eleven30.set(
                         timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH),
                         timenow.get(Calendar.DATE),11,30,0);

                     itemisalcohol = false;
                     if(item_id != null && item_id >=1000 && item_id < 2000)
                         itemisalcohol = true;

                     if( itemisalcohol
                         && timenow.after(midnight) && timenow.before(eleven30)){
                       outFields.put("authorised", false);
                       outFields.put("message", "Sale not authorised by policy task "+subject.taskName+
                         " for time "+df.format(timenow.getTime())+
                         ". Alcohol can not be sold between "+df.format(midnight.getTime())+
                         " and "+df.format(eleven30.getTime()));
                       return true;
                     }
                     else{
                       outFields.put("authorised", true);
                       outFields.put("message", "Sale authorised by policy task "+subject.taskName+
                         " for time "+df.format(timenow.getTime()));
                       return true;
                     }

                     /*
                     This task checks if a sale request is for an item that is an alcoholic drink.
                     If the local time is between 00:00:00 GMT and 11:30:00 GMT then the sale is not
                     authorised. Otherwise the sale is authorised.
                     In this implementation we assume that items with item_ID value between 1000 and
                     2000 are all alcoholic drinks :-)
                     */
                     LE

                     task create name=MorningBoozeCheckAlt1 version=0.0.1 uuid=bc6d90c9-c902-4686-afd3-925b30e39990 description=LS
                     This task checks if a sale request is for an item that is an alcoholic drink.
                     If the local time is between 00:00:00 CET and 13:00:00 CET then the sale is not authorised.
                     Also alcohol sales are not allowed on Sundays. Otherwise the sale is authorised.
                     In this implementation we assume that items with item_ID between 1000 and 2000 are all alcoholic drinks
                     LE
                     task inputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=amount schemaName=price_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true
                     task inputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=quantity schemaName=quantity_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=item_ID schemaName=item_ID_type schemaVersion=0.0.1
                     task inputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=time schemaName=timestamp_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=amount schemaName=price_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true
                     task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=quantity schemaName=quantity_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=item_ID schemaName=item_ID_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=authorised schemaName=authorised_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=time schemaName=timestamp_type schemaVersion=0.0.1
                     task outputfield create name=MorningBoozeCheckAlt1 version=0.0.1 fieldName=message schemaName=message_type schemaVersion=0.0.1 optional=true
                     task logic create name=MorningBoozeCheckAlt1 version=0.0.1 logicFlavour=MVEL logic=LS
                     /*
                      * ============LICENSE_START=======================================================
                      *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                      * ================================================================================
                      * Licensed under the Apache License, Version 2.0 (the "License");
                      * you may not use this file except in compliance with the License.
                      * You may obtain a copy of the License at
                      *
                      *      http://www.apache.org/licenses/LICENSE-2.0
                      *
                      * Unless required by applicable law or agreed to in writing, software
                      * distributed under the License is distributed on an "AS IS" BASIS,
                      * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                      * See the License for the specific language governing permissions and
                      * limitations under the License.
                      *
                      * SPDX-License-Identifier: Apache-2.0
                      * ============LICENSE_END=========================================================
                      */
                     import java.util.Date;
                     import java.util.Calendar;
                     import java.util.TimeZone;
                     import java.text.SimpleDateFormat;

                     logger.info("Task Execution: '"+subject.id+"'. Input Event: '"+inFields+"'");

                     outFields.put("amount"      , inFields.get("amount"));
                     outFields.put("assistant_ID", inFields.get("assistant_ID"));
                     outFields.put("notes"       , inFields.get("notes"));
                     outFields.put("quantity"    , inFields.get("quantity"));
                     outFields.put("branch_ID"   , inFields.get("branch_ID"));
                     outFields.put("item_ID"     , inFields.get("item_ID"));
                     outFields.put("time"        , inFields.get("time"));
                     outFields.put("sale_ID"     , inFields.get("sale_ID"));

                     item_id = inFields.get("item_ID");

                     //The events used later to test this task use CET timezone!
                     cet = TimeZone.getTimeZone("CET");
                     timenow = Calendar.getInstance(cet);
                     df = new SimpleDateFormat("HH:mm:ss z");
                     df.setTimeZone(cet);
                     timenow.setTimeInMillis(inFields.get("time"));

                     midnight = timenow.clone();
                     midnight.set(
                         timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH),
                         timenow.get(Calendar.DATE),0,0,0);
                     onepm = timenow.clone();
                     onepm.set(
                         timenow.get(Calendar.YEAR),timenow.get(Calendar.MONTH),
                         timenow.get(Calendar.DATE),13,0,0);

                     itemisalcohol = false;
                     if(item_id != null && item_id >=1000 && item_id < 2000)
                         itemisalcohol = true;

                     if( itemisalcohol &&
                         ( (timenow.after(midnight) && timenow.before(onepm))
                           ||
                           (timenow.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY)
                         )){
                       outFields.put("authorised", false);
                       outFields.put("message", "Sale not authorised by policy task "+subject.taskName+
                         " for time "+df.format(timenow.getTime())+
                         ". Alcohol can not be sold between "+df.format(midnight.getTime())+
                         " and "+df.format(onepm.getTime()) +" or on Sunday");
                       return true;
                     }
                     else{
                       outFields.put("authorised", true);
                       outFields.put("message", "Sale authorised by policy task "+subject.taskName+
                         " for time "+df.format(timenow.getTime()));
                       return true;
                     }

                     /*
                     This task checks if a sale request is for an item that is an alcoholic drink.
                     If the local time is between 00:00:00 CET and 13:00:00 CET then the sale is not authorised.
                     Also alcohol sales are not allowed on Sundays. Otherwise the sale is authorised.
                     In this implementation we assume that items with item_ID between 1000 and 2000 are all alcoholic drinks :-)
                     */
                     LE

                     event create name=SALE_AUTH version=0.0.1 uuid=c4500941-3f98-4080-a9cc-5b9753ed050b description="An event emitted by the Policy to indicate whether the sale of an item has been authorised" nameSpace=com.hyperm source="APEX" target="POS"
                     event parameter create name=SALE_AUTH version=0.0.1 parName=amount schemaName=price_type schemaVersion=0.0.1
                     event parameter create name=SALE_AUTH version=0.0.1 parName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1
                     event parameter create name=SALE_AUTH version=0.0.1 parName=authorised schemaName=authorised_type schemaVersion=0.0.1
                     event parameter create name=SALE_AUTH version=0.0.1 parName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1
                     event parameter create name=SALE_AUTH version=0.0.1 parName=item_ID schemaName=item_ID_type schemaVersion=0.0.1
                     event parameter create name=SALE_AUTH version=0.0.1 parName=message schemaName=message_type schemaVersion=0.0.1 optional=true
                     event parameter create name=SALE_AUTH version=0.0.1 parName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true
                     event parameter create name=SALE_AUTH version=0.0.1 parName=quantity schemaName=quantity_type schemaVersion=0.0.1
                     event parameter create name=SALE_AUTH version=0.0.1 parName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1
                     event parameter create name=SALE_AUTH version=0.0.1 parName=time schemaName=timestamp_type schemaVersion=0.0.1

                     event create name=SALE_INPUT version=0.0.1 uuid=4f04aa98-e917-4f4a-882a-c75ba5a99374 description="An event raised by the PoS system each time an item is scanned for purchase" nameSpace=com.hyperm source="POS" target="APEX"
                     event parameter create name=SALE_INPUT version=0.0.1 parName=amount schemaName=price_type schemaVersion=0.0.1
                     event parameter create name=SALE_INPUT version=0.0.1 parName=assistant_ID schemaName=assistant_ID_type schemaVersion=0.0.1
                     event parameter create name=SALE_INPUT version=0.0.1 parName=branch_ID schemaName=branch_ID_type schemaVersion=0.0.1
                     event parameter create name=SALE_INPUT version=0.0.1 parName=item_ID schemaName=item_ID_type schemaVersion=0.0.1
                     event parameter create name=SALE_INPUT version=0.0.1 parName=notes schemaName=notes_type schemaVersion=0.0.1 optional=true
                     event parameter create name=SALE_INPUT version=0.0.1 parName=quantity schemaName=quantity_type schemaVersion=0.0.1
                     event parameter create name=SALE_INPUT version=0.0.1 parName=sale_ID schemaName=sale_ID_type schemaVersion=0.0.1
                     event parameter create name=SALE_INPUT version=0.0.1 parName=time schemaName=timestamp_type schemaVersion=0.0.1


                     policy create name=MyFirstPolicy version=0.0.1 uuid=6c5e410f-489a-46ff-964e-982ce6e8b6d0 description="This is my first Apex policy. It checks if a sale should be authorised or not." template=FREEFORM firstState=BoozeAuthDecide
                     policy state create name=MyFirstPolicy version=0.0.1 stateName=BoozeAuthDecide triggerName=SALE_INPUT triggerVersion=0.0.1 defaultTaskName=MorningBoozeCheck defaultTaskVersion=0.0.1
                     policy state output create name=MyFirstPolicy version=0.0.1 stateName=BoozeAuthDecide outputName=MorningBoozeCheck_Output_Direct eventName=SALE_AUTH eventVersion=0.0.1 nextState=NULL
                     policy state taskref create name=MyFirstPolicy version=0.0.1 stateName=BoozeAuthDecide taskLocalName=MorningBoozeCheckAlt1 taskName=MorningBoozeCheckAlt1 taskVersion=0.0.1 outputType=DIRECT outputName=MorningBoozeCheck_Output_Direct
                     policy state taskref create name=MyFirstPolicy version=0.0.1 stateName=BoozeAuthDecide taskLocalName=MorningBoozeCheck taskName=MorningBoozeCheck taskVersion=0.0.1 outputType=DIRECT outputName=MorningBoozeCheck_Output_Direct
                     policy state selecttasklogic create name=MyFirstPolicy version=0.0.1 stateName=BoozeAuthDecide logicFlavour=JAVASCRIPT logic=LS
                     /*
                      * ============LICENSE_START=======================================================
                      *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
                      * ================================================================================
                      * Licensed under the Apache License, Version 2.0 (the "License");
                      * you may not use this file except in compliance with the License.
                      * You may obtain a copy of the License at
                      *
                      *      http://www.apache.org/licenses/LICENSE-2.0
                      *
                      * Unless required by applicable law or agreed to in writing, software
                      * distributed under the License is distributed on an "AS IS" BASIS,
                      * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
                      * See the License for the specific language governing permissions and
                      * limitations under the License.
                      *
                      * SPDX-License-Identifier: Apache-2.0
                      * ============LICENSE_END=========================================================
                      */

                     var returnValueType = Java.type("java.lang.Boolean");
                     var returnValue = new returnValueType(true);

                     executor.logger.info("Task Selection Execution: '"+executor.subject.id+"'. Input Event: '"+executor.inFields+"'");

                     branchid = executor.inFields.get("branch_ID");
                     taskorig = executor.subject.getTaskKey("MorningBoozeCheck");
                     taskalt = executor.subject.getTaskKey("MorningBoozeCheckAlt1");
                     taskdef = executor.subject.getDefaultTaskKey();

                     if(branchid >=0 && branchid <1000){
                       taskorig.copyTo(executor.selectedTask);
                     }
                     else if (branchid >=1000 && branchid <2000){
                       taskalt.copyTo(executor.selectedTask);
                     }
                     else{
                       taskdef.copyTo(executor.selectedTask);
                     }

                     /*
                     This task selection logic selects task "MorningBoozeCheck" for branches with 0<=branch_ID<1000 and selects task "MorningBoozeCheckAlt1" for branches with 1000<=branch_ID<2000. Otherwise the default task is selected. In this case the default task is also "MorningBoozeCheck"
                     */
                     LE

APEX Logging
^^^^^^^^^^^^

Introduction to APEX Logging
----------------------------

         .. container:: paragraph

            All APEX components make extensive use of logging using the
            logging façade `SLF4J <https://www.slf4j.org/>`__ with the
            backend `Logback <https://logback.qos.ch/>`__. Both are used
            off-the-shelve, so the standard documentation and
            configuration apply to APEX logging. For details on how to
            work with logback please see the `logback
            manual <https://logback.qos.ch/manual/index.html>`__.

         .. container:: paragraph

            The APEX applications is the logback configuration file
            ``$APEX_HOME/etc/logback.xml`` (Windows:
            ``%APEX_HOME%\etc\logback.xml``). The logging backend is set
            to no debug, i.e. logs from the logging framework should be
            hidden at runtime.

         .. container:: paragraph

            The configurable log levels work as expected:

         .. container:: ulist

            -  *error* (or *ERROR*) is used for serious errors in the
               APEX runtime engine

            -  *warn* (or *WARN*) is used for warnings, which in general
               can be ignored but might indicate some deeper problems

            -  *info* (or *INFO*) is used to provide generally
               interesting messages for startup and policy execution

            -  *debug* (or *DEBUG*) provides more details on startup and
               policy execution

            -  *trace* (or *TRACE*) gives full details on every aspect
               of the APEX engine from start to end

         .. container:: paragraph

            The loggers can also be configured as expected. The standard
            configuration (after installing APEX) uses log level *info*
            on all APEX classes (components).

         .. container:: paragraph

            The applications and scripts in ``$APEX_HOME/bin`` (Windows:
            ``%APEX_HOME\bin``) are configured to use the logback
            configuration ``$APEX_HOME/etc/logback.xml`` (Windows:
            ``%APEX_HOME\etc\logback.xml``). There are multiple ways to
            use different logback configurations, for instance:

         .. container:: ulist

            -  Maintain multiple configurations in ``etc``, for instance
               a ``logback-debug.xml`` for deep debugging and a
               ``logback-production.xml`` for APEX in production mode,
               then copy the required configuration file to the used
               ``logback.xml`` prior starting APEX

            -  Edit the scripts in ``bin`` to use a different logback
               configuration file (only recommended if you are familiar
               with editing bash scripts or windows batch files)

Standard Logging Configuration
------------------------------

         .. container:: paragraph

            The standard logging configuration defines a context *APEX*,
            which is used in the standard output pattern. The location
            for log files is defined in the property ``VAR_LOG`` and set
            to ``/var/log/onap/policy/apex-pdp``. The standard status
            listener is set to *NOP* and the overall logback
            configuration is set to no debug.

         .. container:: listingblock

            .. container:: content

               .. code::
                 :number-lines:

                 <configuration debug="false">
                   <statusListener class="ch.qos.logback.core.status.NopStatusListener" />

                    <contextName>Apex</contextName>
                    <property name="VAR_LOG" value="/var/log/onap/policy/apex-pdp/" />

                   ...appenders
                   ...loggers
                 </configuration>

.. container:: paragraph

   The first appender defined is called ``STDOUT`` for logs to standard
   out.

.. container:: listingblock

   .. container:: content

      .. code::
        :number-lines:

        <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
         <encoder>
            <Pattern>%d %contextName [%t] %level %logger{36} - %msg%n</Pattern>
          </encoder>
        </appender>

.. container:: paragraph

   The root level logger then is set to the level *info* using the
   standard out appender.

.. container:: listingblock

   .. container:: content

      .. code::
        :number-lines:

        <root level="info">
          <appender-ref ref="STDOUT" />
        </root>

.. container:: paragraph

   The second appender is called ``FILE``. It writes logs to a file
   ``apex.log``.

.. container:: listingblock

   .. container:: content

      .. code::
        :number-lines:

        <appender name="FILE" class="ch.qos.logback.core.FileAppender">
          <file>${VAR_LOG}/apex.log</file>
          <encoder>
            <pattern>%d %-5relative [procId=${processId}] [%thread] %-5level %logger{26} - %msg %n %ex{full}</pattern>
          </encoder>
        </appender>

.. container:: paragraph

   The third appender is called ``CTXT_FILE``. It writes logs to a file
   ``apex_ctxt.log``.

.. container:: listingblock

   .. container:: content

      .. code::
        :number-lines:

        <appender name="CTXT_FILE" class="ch.qos.logback.core.FileAppender">
          <file>${VAR_LOG}/apex_ctxt.log</file>
          <encoder>
            <pattern>%d %-5relative [procId=${processId}] [%thread] %-5level %logger{26} - %msg %n %ex{full}</pattern>
          </encoder>
        </appender>

.. container:: paragraph

   The last definitions are for specific loggers. The first logger
   captures all standard APEX classes. It is configured for log level
   *info* and uses the standard output and file appenders. The second
   logger captures APEX context classes responsible for context
   monitoring. It is configured for log level *trace* and uses the
   context file appender.

.. container:: listingblock

   .. container:: content

      .. code::
        :number-lines:


        <logger name="org.onap.policy.apex" level="info" additivity="false">
          <appender-ref ref="STDOUT" />
          <appender-ref ref="FILE" />
        </logger>

        <logger name="org.onap.policy.apex.core.context.monitoring" level="TRACE" additivity="false">
          <appender-ref ref="CTXT_FILE" />
        </logger>

Adding Logback Status and Debug
-------------------------------

   .. container:: paragraph

      To activate logback status messages change the status listener
      from 'NOP' to for instance console.

   .. container:: listingblock

      .. container:: content

         .. code::

            <statusListener class="ch.qos.logback.core.status.OnConsoleStatusListener" />

   .. container:: paragraph

      To activate all logback debugging, for instance to debug a new
      logback configuration, activate the debug attribute in the
      configuration.

   .. container:: listingblock

      .. container:: content

         .. code::

            <configuration debug="true">
            ...
            </configuration>

Logging External Components
---------------------------

   .. container:: paragraph

      Logback can also be configured to log any other, external
      components APEX is using, if they are using the common logging
      framework.

   .. container:: paragraph

      For instance, the context component of APEX is using *Infinispan*
      and one can add a logger for this external component. The
      following example adds a logger for *Infinispan* using the
      standard output appender.

   .. container:: listingblock

      .. container:: content

         .. code::

            <logger name="org.infinispan" level="INFO" additivity="false">
              <appender-ref ref="STDOUT" />
            </logger>

   .. container:: paragraph

      Another example is Apache Zookeeper. The following example adds a
      logger for Zookeeper using the standard outout appender.

   .. container:: listingblock

      .. container:: content

         .. code::

            <logger name="org.apache.zookeeper.ClientCnxn" level="INFO" additivity="false">
              <appender-ref ref="STDOUT" />
            </logger>

Configuring loggers for Policy Logic
------------------------------------

   .. container:: paragraph

      The logging for the logic inside a policy (task logic, task
      selection logic, state finalizer logic) can be configured separate
      from standard logging. The logger for policy logic is
      ``org.onap.policy.apex.executionlogging``. The following example
      defines

   .. container:: ulist

      -  a new appender for standard out using a very simple pattern
         (simply the actual message)

      -  a logger for policy logic to standard out using the new
         appender and the already described file appender.

   .. container:: listingblock

      .. container:: content

         .. code::

            <appender name="POLICY_APPENDER_STDOUT" class="ch.qos.logback.core.ConsoleAppender">
              <encoder>
                <pattern>policy: %msg\n</pattern>
              </encoder>
            </appender>

            <logger name="org.onap.policy.apex.executionlogging" level="info" additivity="false">
              <appender-ref ref="POLICY_APPENDER_STDOUT" />
              <appender-ref ref="FILE" />
            </logger>

   .. container:: paragraph

      It is also possible to use specific logging for parts of policy
      logic. The following example defines a logger for task logic.

   .. container:: listingblock

      .. container:: content

         .. code::

            <logger name="org.onap.policy.apex.executionlogging.TaskExecutionLogging" level="TRACE" additivity="false">
              <appender-ref ref="POLICY_APPENDER_STDOUT" />
            </logger>

Rolling File Appenders
----------------------

   .. container:: paragraph

      Rolling file appenders are a good option for more complex logging
      of a production or complex testing APEX installation. The standard
      logback configuration can be used for these use cases. This
      section gives two examples for the standard logging and for
      context logging.

   .. container:: paragraph

      First the standard logging. The following example defines a
      rolling file appender. The appender rolls over on a daily basis.
      It allows for a file size of 100 MB.

   .. container:: listingblock

      .. container:: content

         .. code::

            <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
              <file>${VAR_LOG}/apex.log</file>
              <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
                <!-- rollover daily -->
                <!-- <fileNamePattern>xstream-%d{yyyy-MM-dd}.%i.txt</fileNamePattern> -->
                <fileNamePattern>${VAR_LOG}/apex_%d{yyyy-MM-dd}.%i.log.gz
                </fileNamePattern>
                <maxHistory>4</maxHistory>
                <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                  <!-- or whenever the file size reaches 100MB -->
                  <maxFileSize>100MB</maxFileSize>
                </timeBasedFileNamingAndTriggeringPolicy>
              </rollingPolicy>
              <encoder>
                <pattern>
                  %d %-5relative [procId=${processId}] [%thread] %-5level %logger{26} - %msg %ex{full} %n
                </pattern>
              </encoder>
            </appender>

   .. container:: paragraph

      A very similar configuration can be used for a rolling file
      appender logging APEX context.

   .. container:: listingblock

      .. container:: content

         .. code::

            <appender name="CTXT-FILE"
                  class="ch.qos.logback.core.rolling.RollingFileAppender">
              <file>${VAR_LOG}/apex_ctxt.log</file>
              <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
                <fileNamePattern>${VAR_LOG}/apex_ctxt_%d{yyyy-MM-dd}.%i.log.gz
                </fileNamePattern>
                <maxHistory>4</maxHistory>
                <timeBasedFileNamingAndTriggeringPolicy
                    class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                  <maxFileSize>100MB</maxFileSize>
                </timeBasedFileNamingAndTriggeringPolicy>
              </rollingPolicy>
              <encoder>
                <pattern>
                  %d %-5relative [procId=${processId}] [%thread] %-5level %logger{26} - %msg %ex{full} %n
                </pattern>
              </encoder>
            </appender>

Example Configuration for Logging Logic
---------------------------------------

   .. container:: paragraph

      The following example shows a configuration that logs policy logic
      to standard out and a file (*info*). All other APEX components are
      logging to a file (*debug*).. This configuration an be used in a
      pre-production phase with the APEX engine still running in a
      separate terminal to monitor policy execution. This logback
      configuration is in the APEX installation as
      ``etc/logback-logic.xml``.

   .. container:: listingblock

      .. container:: content

         .. code::

            <configuration debug="false">
                <statusListener class="ch.qos.logback.core.status.NopStatusListener" />

                <contextName>Apex</contextName>
                <property name="VAR_LOG" value="/var/log/onap/policy/apex-pdp/" />

                <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
                    <encoder>
                        <Pattern>%d %contextName [%t] %level %logger{36} - %msg%n</Pattern>
                    </encoder>
                </appender>

                <appender name="FILE" class="ch.qos.logback.core.FileAppender">
                    <file>${VAR_LOG}/apex.log</file>
                    <encoder>
                        <pattern>
                            %d %-5relative [procId=${processId}] [%thread] %-5level%logger{26} - %msg %n %ex{full}
                        </pattern>
                    </encoder>
                </appender>

                <appender name="POLICY_APPENDER_STDOUT" class="ch.qos.logback.core.ConsoleAppender">
                    <encoder>
                        <pattern>policy: %msg\n</pattern>
                    </encoder>
                </appender>

                <root level="error">
                    <appender-ref ref="STDOUT" />
                </root>

                <logger name="org.onap.policy.apex" level="debug" additivity="false">
                    <appender-ref ref="FILE" />
                </logger>

                <logger name="org.onap.policy.apex.executionlogging" level="info" additivity="false">
                    <appender-ref ref="POLICY_APPENDER_STDOUT" />
                    <appender-ref ref="FILE" />
                </logger>
            </configuration>

Example Configuration for a Production Server
---------------------------------------------

   .. container:: paragraph

      The following example shows a configuration that logs all APEX
      components, including policy logic, to a file (*debug*). This
      configuration an be used in a production phase with the APEX
      engine being executed as a service on a system without console
      output. This logback configuration is in the APEX installation as
      ``logback-server.xml``

   .. container:: listingblock

      .. container:: content

         .. code::

            <configuration debug="false">
                <statusListener class="ch.qos.logback.core.status.NopStatusListener" />

                <contextName>Apex</contextName>
                <property name="VAR_LOG" value="/var/log/onap/policy/apex-pdp/" />

                <appender name="FILE" class="ch.qos.logback.core.FileAppender">
                    <file>${VAR_LOG}/apex.log</file>
                    <encoder>
                        <pattern>
                            %d %-5relative [procId=${processId}] [%thread] %-5level%logger{26} - %msg %n %ex{full}
                        </pattern>
                    </encoder>
                </appender>

                <root level="debug">
                    <appender-ref ref="FILE" />
                </root>

                <logger name="org.onap.policy.apex.executionlogging" level="debug" additivity="false">
                    <appender-ref ref="FILE" />
                </logger>
            </configuration>

Building a System with Websocket Backend
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Websockets
----------

         .. container:: paragraph

            Websocket is a protocol to run sockets of HTTP. Since it in
            essence a socket, the connection is realized between a
            server (waiting for connections) and a client (connecting to
            a server). Server/client separation is only important for
            connection establishment, once connected, everyone can
            send/receive on the same socket (as any standard socket
            would allow).

         .. container:: paragraph

            Standard Websocket implementations are simple, no
            publish/subscribe and no special event handling. Most
            servers simply send all incoming messages to all
            connections. There is a PubSub definition on top of
            Websocket called `WAMP <http://wamp-proto.org/>`__. APEX
            does not support WAMP at the moment.

Websocket in Java
-----------------

         .. container:: paragraph

            In Java, `JSR
            356 <http://www.oracle.com/technetwork/articles/java/jsr356-1937161.html>`__
            defines the standard Websocket API. This JSR is part of Jave
            EE 7 standard. For Java SE, several implementations exist in
            open source. Since Websockets are a stable standard and
            simple, most implementations are stable and ready to use. A
            lot of products support Websockets, like Spring, JBoss,
            Netty, … there are also Kafka extensions for Websockets.

Websocket Example Code for Websocket clients (FOSS)
---------------------------------------------------

         .. container:: paragraph

            There are a lot of implementations and examples available on
            Github for Websocket clients. If one is using Java EE 7,
            then one can also use the native Websocket implementation.
            Good examples for clients using simply Java SE are here:

         .. container:: ulist

            -  `Websocket
               implementation <https://github.com/TooTallNate/Java-WebSocket>`__

            -  `Websocket sending client example, using
               AWT <https://github.com/TooTallNate/Java-WebSocket/blob/master/src/main/example/ChatClient.java>`__

            -  `Websocket receiving client example (simple echo
               client) <https://github.com/TooTallNate/Java-WebSocket/blob/master/src/main/example/ExampleClient.java>`__

         .. container:: paragraph

            For Java EE, the native Websocket API is explained here:

         .. container:: ulist

            -  `Oracle
               docs <http://www.oracle.com/technetwork/articles/java/jsr356-1937161.html>`__

            -  link: `An
               example <http://www.programmingforliving.com/2013/08/jsr-356-java-api-for-websocket-client-api.html>`__

BCP: Websocket Configuration
----------------------------

         .. container:: paragraph

            The probably best is to configure APEX for Websocket servers
            for input (ingress, consume) and output (egress, produce)
            interfaces. This means that APEX will start Websocket
            servers on named ports and wait for clients to connect.
            Advantage: once APEX is running all connectivity
            infrastructure is running as well. Consequence: if APEX is
            not running, everyone else is in the dark, too.

         .. container:: paragraph

            The best protocol to be used is JSON string. Each event on
            any interface is then a string with a JSON encoding. JSON
            string is a little bit slower than byte code, but we doubt
            that this will be noticeable. A further advantage of JSON
            strings over Websockets with APEX starting the servers: it
            is very easy to connect web browsers to such a system.
            Simple connect the web browser to the APEX sockets and
            send/read JSON strings.

         .. container:: paragraph

            Once APEX is started you simply connect Websocket clients to
            it, and send/receive event. When APEX is terminated, the
            Websocket servers go down, and the clients will be
            disconnected. APEX does not (yet) support auto-client
            reconnect nor WAMP, so clients might need to be restarted or
            reconnected manually after an APEX boot.

Demo with VPN Policy Model
--------------------------

         .. container:: paragraph

            We assume that you have an APEX installation using the full
            package, i.e. APEX with all examples, of version ``0.5.6``
            or higher. We will use the VPN policy from the APEX examples
            here.

         .. container:: paragraph

            Now, have the following ready to start the demo:

         .. container:: ulist

            -  3 terminals on the host where APEX is running (we need 1
               for APEX and 1 for each client)

            -  the events in the file
               ``$APEX_HOME/examples/events/VPN/SetupEvents.json`` open
               in an editor (we need to send those events to APEX)

            -  the events in the file
               ``$APEX_HOME/examples/events/VPN/Link09Events.json`` open
               in an editor (we need to send those events to APEX)

A Websocket Configuration for the VPN Domain
############################################

            .. container:: paragraph

               Create a new APEX configuration using the VPN policy
               model and configuring APEX as discussed above for
               Websockets. Copy the following configuration into
               ``$APEX_HOME/examples/config/VPN/Ws2WsServerAvroContextJsonEvent.json``
               (for Windows use
               ``%APEX_HOME%\examples\config\VPN\Ws2WsServerAvroContextJsonEvent.json``):

            .. container:: listingblock

               .. container:: content

                  .. code::
                    :number-lines:

                    {
                      "engineServiceParameters" : {
                        "name"          : "VPNApexEngine",
                        "version"        : "0.0.1",
                        "id"             :  45,
                        "instanceCount"  : 1,
                        "deploymentPort" : 12345,
                        "policyModelFileName" : "examples/models/VPN/VPNPolicyModelAvro.json",
                        "engineParameters"    : {
                          "executorParameters" : {
                            "MVEL" : {
                              "parameterClassName" : "org.onap.policy.apex.plugins.executor.mvel.MVELExecutorParameters"
                            }
                          },
                          "contextParameters" : {
                            "parameterClassName" : "org.onap.policy.apex.context.parameters.ContextParameters",
                            "schemaParameters":{
                              "Avro":{
                                "parameterClassName" : "org.onap.policy.apex.plugins.context.schema.avro.AvroSchemaHelperParameters"
                              }
                            }
                          }
                        }
                      },
                      "producerCarrierTechnologyParameters" : {
                        "carrierTechnology" : "WEBSOCKET",
                        "parameterClassName" : "org.onap.policy.apex.plugins.event.carrier.websocket.WEBSOCKETCarrierTechnologyParameters",
                        "parameters" : {
                          "wsClient" : false,
                          "port"     : 42452
                        }
                      },
                      "producerEventProtocolParameters" : {
                        "eventProtocol" : "JSON"
                      },
                      "consumerCarrierTechnologyParameters" : {
                        "carrierTechnology" : "WEBSOCKET",
                        "parameterClassName" : "org.onap.policy.apex.plugins.event.carrier.websocket.WEBSOCKETCarrierTechnologyParameters",
                        "parameters" : {
                         "wsClient" : false,
                          "port"     : 42450
                        }
                      },
                      "consumerEventProtocolParameters" : {
                        "eventProtocol" : "JSON"
                      }
                    }

Start APEX Engine
#################

   .. container:: paragraph

      In a new terminal, start APEX with the new configuration for
      Websocket-Server ingress/egress:

   .. container:: listingblock

      .. container:: content

         .. code::
            :number-lines:

            #: $APEX_HOME/bin/apexEngine.sh -c $APEX_HOME/examples/config/VPN/Ws2WsServerAvroContextJsonEvent.json

.. container:: listingblock

   .. container:: content

      .. code::
        :number-lines:

        #: %APEX_HOME%\bin\apexEngine.bat -c %APEX_HOME%\examples\config\VPN\Ws2WsServerAvroContextJsonEvent.json

.. container:: paragraph

   Wait for APEX to start, it takes a while to create all Websocket
   servers (about 8 seconds on a standard laptop without cached
   binaries). depending on your log messages, you will see no (some, a
   lot) log messages. If APEX starts correctly, the last few messages
   you should see are:

.. container:: listingblock

   .. container:: content

      .. code::
        :number-lines:

         2017-07-28 13:17:20,834 Apex [main] INFO c.e.a.s.engine.runtime.EngineService - engine model VPNPolicyModelAvro:0.0.1 added to the engine-AxArtifactKey:(name=VPNApexEngine-0,version=0.0.1)
         2017-07-28 13:17:21,057 Apex [Apex-apex-engine-service-0:0] INFO c.e.a.s.engine.runtime.EngineService - Engine AxArtifactKey:(name=VPNApexEngine-0,version=0.0.1) processing ...
         2017-07-28 13:17:21,296 Apex [main] INFO c.e.a.s.e.r.impl.EngineServiceImpl - Added the action listener to the engine
         Started Apex service

.. container:: paragraph

   APEX is running in the new terminal and will produce output when the
   policy is triggered/executed.

Run the Websocket Echo Client
#############################

   .. container:: paragraph

      The echo client is included in an APEX full installation. To run
      the client, open a new shell (Unix, Cygwin) or command prompt
      (``cmd`` on Windows). Then use the APEX application launcher to
      start the client.

   .. important::  
      APEX engine needs to run first
      The example assumes that an APEX engine configured for *produce* carrier technology Websocket and *JSON* event protocol is executed first.

   +---------------------------------------------------------+-----------------------------------------------------------+
   | Unix, Cygwin                                            | Windows                                                   |
   +=========================================================+===========================================================+
   | .. container::                                          | .. container::                                            |
   |                                                         |                                                           |
   |    .. container:: listingblock                          |    .. container:: listingblock                            |
   |                                                         |                                                           |
   |       .. container:: content                            |       .. container:: content                              |
   |                                                         |                                                           |
   |          .. code::                                      |          .. code::                                        |
   |                                                         |                                                           |
   |             # $APEX_HOME/bin/apexApps.sh ws-echo [args] |             > %APEX_HOME%\bin\apexApps.bat ws-echo [args] |
   +---------------------------------------------------------+-----------------------------------------------------------+

   .. container:: paragraph

      Use the following command line arguments for server and port of
      the Websocket server. The port should be the same as configured in
      the APEX engine. The server host should be the host on which the
      APEX engine is running

   .. container:: ulist

      -  ``-p`` defines the Websocket port to connect to (defaults to
         ``8887``)

      -  ``-s`` defines the host on which a Websocket server is running
         (defaults to ``localhost``)

   .. container:: paragraph

      Let’s assume that there is an APEX engine running, configured for
      produce Websocket carrier technology, as server, for port 42452,
      with produce event protocol JSON,. If we start the console client
      on the same host, we can omit the ``-s`` options. We start the
      console client as:

   .. container:: listingblock

      .. container:: content

         .. code::

            # $APEX_HOME/bin/apexApps.sh ws-echo -p 42452 (1)
            > %APEX_HOME%\bin\apexApps.bat ws-echo -p 42452 (2)

   .. container:: colist arabic

      +-------+--------------------------------+
      | **1** | Start client on Unix or Cygwin |
      +-------+--------------------------------+
      | **2** | Start client on Windows        |
      +-------+--------------------------------+

   .. container:: paragraph

      Once started successfully, the client will produce the following
      messages (assuming we used ``-p 42452`` and an APEX engine is
      running on ``localhost`` with the same port:

   .. container:: listingblock

      .. container:: content

         .. code::

            ws-simple-echo: starting simple event echo
             --> server: localhost
             --> port: 42452

            Once started, the application will simply print out all received events to standard out.
            Each received event will be prefixed by '---' and suffixed by '===='


            ws-simple-echo: opened connection to APEX (Web Socket Protocol Handshake)

Run the Websocket Console Client
################################

   .. container:: paragraph

      The console client is included in an APEX full installation. To
      run the client, open a new shell (Unix, Cygwin) or command prompt
      (``cmd`` on Windows). Then use the APEX application launcher to
      start the client.

   .. important::  
      APEX engine needs to run first
      The example assumes that an APEX engine configured for *consume* carrier technology Websocket and *JSON* event
      protocol is executed first.

   +------------------------------------------------------------+--------------------------------------------------------------+
   | Unix, Cygwin                                               | Windows                                                      |
   +============================================================+==============================================================+
   | .. container::                                             | .. container::                                               |
   |                                                            |                                                              |
   |    .. container:: listingblock                             |    .. container:: listingblock                               |
   |                                                            |                                                              |
   |       .. container:: content                               |       .. container:: content                                 |
   |                                                            |                                                              |
   |          .. code::                                         |          .. code::                                           |
   |                                                            |                                                              |
   |             # $APEX_HOME/bin/apexApps.sh ws-console [args] |             > %APEX_HOME%\bin\apexApps.bat ws-console [args] |
   +------------------------------------------------------------+--------------------------------------------------------------+

   .. container:: paragraph

      Use the following command line arguments for server and port of
      the Websocket server. The port should be the same as configured in
      the APEX engine. The server host should be the host on which the
      APEX engine is running

   .. container:: ulist

      -  ``-p`` defines the Websocket port to connect to (defaults to
         ``8887``)

      -  ``-s`` defines the host on which a Websocket server is running
         (defaults to ``localhost``)

   .. container:: paragraph

      Let’s assume that there is an APEX engine running, configured for
      consume Websocket carrier technology, as server, for port 42450,
      with consume event protocol JSON,. If we start the console client
      on the same host, we can omit the ``-s`` options. We start the
      console client as:

   .. container:: listingblock

      .. container:: content

         .. code::

            # $APEX_HOME/bin/apexApps.sh ws-console -p 42450 (1)
            > %APEX_HOME%\bin\apexApps.sh ws-console -p 42450 (2)

   .. container:: colist arabic

      +-------+--------------------------------+
      | **1** | Start client on Unix or Cygwin |
      +-------+--------------------------------+
      | **2** | Start client on Windows        |
      +-------+--------------------------------+

   .. container:: paragraph

      Once started successfully, the client will produce the following
      messages (assuming we used ``-p 42450`` and an APEX engine is
      running on ``localhost`` with the same port:

   .. container:: listingblock

      .. container:: content

         .. code::

            ws-simple-console: starting simple event console
             --> server: localhost
             --> port: 42450

             - terminate the application typing 'exit<enter>' or using 'CTRL+C'
             - events are created by a non-blank starting line and terminated by a blank line


            ws-simple-console: opened connection to APEX (Web Socket Protocol Handshake)

Send Events
###########

   .. container:: paragraph

      Now you have the full system up and running:

   .. container:: ulist

      -  Terminal 1: APEX ready and loaded

      -  Terminal 2: an echo client, printing received messages produced
         by the VPN policy

      -  Terminal 2: a console client, waiting for input on the console
         (standard in) and sending text to APEX

   .. container:: paragraph

      We started the engine with the VPN policy example. So all the
      events we are using now are located in files in the following
      example directory:

   .. container:: listingblock

      .. container:: content

         .. code::
           :number-lines:

           #: $APEX_HOME/examples/events/VPN
           > %APEX_HOME%\examples\events\VPN

.. container:: paragraph

   To sends events, simply copy the content of the event files into
   Terminal 3 (the console client). It will read multi-line JSON text
   and send the events. So copy the content of ``SetupEvents.json`` into
   the client. APEX will trigger a policy and produce some output, the
   echo client will also print some events created in the policy. In
   Terminal 1 (APEX) you’ll see some status messages from the policy as:

.. container:: listingblock

   .. container:: content

      .. code::
        :number-lines:

        {Link=L09, LinkUp=true}
        L09     true
        outFields: {Link=L09, LinkUp=true}
        {Link=L10, LinkUp=true}
        L09     true
        L10     true
        outFields: {Link=L10, LinkUp=true}
        {CustomerName=C, LinkList=L09 L10, SlaDT=300, YtdDT=300}
        *** Customers ***
        C       300     300     [L09, L10]
        outFields: {CustomerName=C, LinkList=L09 L10, SlaDT=300, YtdDT=300}
        {CustomerName=A, LinkList=L09 L10, SlaDT=300, YtdDT=50}
        *** Customers ***
        A       300     50      [L09, L10]
        C       300     300     [L09, L10]
        outFields: {CustomerName=A, LinkList=L09 L10, SlaDT=300, YtdDT=50}
        {CustomerName=D, LinkList=L09 L10, SlaDT=300, YtdDT=400}
        *** Customers ***
        A       300     50      [L09, L10]
        C       300     300     [L09, L10]
        D       300     400     [L09, L10]
        outFields: {CustomerName=D, LinkList=L09 L10, SlaDT=300, YtdDT=400}
        {CustomerName=B, LinkList=L09 L10, SlaDT=300, YtdDT=299}
        *** Customers ***
        A       300     50      [L09, L10]
        B       300     299     [L09, L10]
        C       300     300     [L09, L10]
        D       300     400     [L09, L10]
        outFields: {CustomerName=B, LinkList=L09 L10, SlaDT=300, YtdDT=299}

.. container:: paragraph

   In Terminal 2 (echo-client) you see the received events, the last two
   should look like:

.. container:: listingblock

   .. container:: content

      .. code::
        :number-lines:

        ws-simple-echo: received
        ---------------------------------
        {
          "name": "VPNCustomerCtxtActEvent",
          "version": "0.0.1",
          "nameSpace": "org.onap.policy.apex.domains.vpn.events",
          "source": "Source",
          "target": "Target",
          "CustomerName": "C",
          "LinkList": "L09 L10",
          "SlaDT": 300,
          "YtdDT": 300
        }
        =================================

        ws-simple-echo: received
        ---------------------------------
        {
          "name": "VPNCustomerCtxtActEvent",
          "version": "0.0.1",
          "nameSpace": "org.onap.policy.apex.domains.vpn.events",
          "source": "Source",
          "target": "Target",
          "CustomerName": "D",
          "LinkList": "L09 L10",
          "SlaDT": 300,
          "YtdDT": 400
        }
        =================================

.. container:: paragraph

   Congratulations, you have triggered a policy in APEX using
   Websockets, the policy did run through, created events, picked up by
   the echo-client.

.. container:: paragraph

   Now you can send the Link 09 and Link 10 events, they will trigger
   the actual VPN policy and some calculations are made. Let’s take the
   Link 09 events from ``Link09Events.json``, copy them all into
   Terminal 3 (the console). APEX will run the policy (with some status
   output), and the echo client will receive and print events.

.. container:: paragraph

   To terminate the applications, simply press ``CTRL+C`` in Terminal 1
   (APEX). This will also terminate the echo-client in Terminal 2. Then
   type ``exit<enter>`` in Terminal 3 (or ``CTRL+C``) to terminate the
   console-client.

.. container::
   :name: footer

   .. container::
      :name: footer-text

      2.0.0-SNAPSHOT
      Last updated 2018-09-10 15:38:16 IST

.. |Extract the TAR archive| image:: images/install-guide/win-extract-tar-gz.png
.. |Extract the APEX distribution| image:: images/install-guide/win-extract-tar.png
.. |REST Editor Start Screen| image:: images/install-guide/rest-start.png
.. |REST Editor with loaded SampleDomain Policy Model| image:: images/install-guide/rest-loaded.png
.. |APEX Configuration Matrix| image:: images/apex-intro/ApexEngineConfig.png
.. |File > New to create a new Policy Model| image:: images/mfp/MyFirstPolicy_P1_newPolicyModel1.png
.. |Create a new Policy Model| image:: images/mfp/MyFirstPolicy_P1_newPolicyModel2.png
.. |Right click to create a new event| image:: images/mfp/MyFirstPolicy_P1_newEvent1.png
.. |Fill in the necessary information for the 'SALE_INPUT' event and click 'Submit'| image:: images/mfp/MyFirstPolicy_P1_newEvent2.png
.. |Right click to create a new Item Schema| image:: images/mfp/MyFirstPolicy_P1_newItemSchema1.png
.. |Create a new Item Schema| image:: images/mfp/MyFirstPolicy_P1_newItemSchema2.png
.. |Add new event parameters to an event| image:: images/mfp/MyFirstPolicy_P1_newEvent3.png
.. |Right click to create a new task| image:: images/mfp/MyFirstPolicy_P1_newTask1.png
.. |Add input and out fields for the task| image:: images/mfp/MyFirstPolicy_P1_newTask2.png
.. |Add task logic the task| image:: images/mfp/MyFirstPolicy_P1_newTask3.png
.. |Create a new policy| image:: images/mfp/MyFirstPolicy_P1_newPolicy1.png
.. |Create a state| image:: images/mfp/MyFirstPolicy_P1_newState1.png
.. |Add a Task and Output Mapping| image:: images/mfp/MyFirstPolicy_P1_newState2.png
.. |Validate the policy model for error using the 'Model' > 'Validate' menu item| image:: images/mfp/MyFirstPolicy_P1_validatePolicyModel.png
.. |Download the completed policy model using the 'File' > 'Download' menu item| image:: images/mfp/MyFirstPolicy_P1_exportPolicyModel1.png
.. |Create a new alternative task MorningBoozeCheckAlt1| image:: images/mfp/MyFirstPolicy_P2_newTask1.png
.. |Right click to edit a policy| image:: images/mfp/MyFirstPolicy_P2_editPolicy1.png
.. |State definition with 2 Tasks and Task Selection Logic| image:: images/mfp/MyFirstPolicy_P2_editState1.png