[overlord-issues] [JBoss JIRA] (RTGOV-272) Activity store implementation for Cassandra

[Gary Brown (JIRA)]

    [ https://issues.jboss.org/browse/RTGOV-272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12954905#comment-12954905 ] 

Gary Brown commented on RTGOV-272:
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There are a number of steps to this task:

1) Implement the Apache Cassandra version of the ActivityStore API. This module should be created in the $rtgov/modules/activity-management location

2) Identify best way to initialize the schema in the Cassandra db.

a) In EAP(JBossAS): For JPA, the rtgov install procedure initializes a H2 db. The FSW product has a more comprehensive configuration to support multiple relational databases. Need to consider whether the user should be offered the option of using Cassandra during the install, and if so perform the necessary steps there?

b) In Karaf: currently the activity store impl is installed as a separate feature. This may be the way to go in OSGi, so the user would select the activity store impl based on the feature they install. So need to add a cassandra based feature into the $rtgov/release/karaf/features/pom.xml - however this does not result in an initialized db - so this may need to be performed outside the installation of rtgov in karaf/fuse.

3) In the release/jbossas/war-server - include the CassandraActivityStore artifact, so the jar is packaged in the war. However this won't automatically use this implementation on deployment, the "ActivityStore.class" property needs to be defined in the $eap/standalone/config/overlord-rtgov.properties file, to define the class name of the activity store to use, if no the default JPA implementation.

4) Integration testing:

a) EAP/JBossAS - uses arquillian to automate startup of the server, deployment of tests, etc. These tests are in $rtgov/release/jbossas/tests. The tests under the 'platform' sub folder install a full version of rtgov into the test EAP environment, which by default will use the JPA activity store. Not sure currently how the tests can override the overlord-rtgov.properties, before the components are initialized. So the alternative would be to install just the required components, as performed in tests/activity-management/activity-server-rest, which uses the inmemory implementation of the activity store.

b) Karaf/Fuse - no integration test mechanism currently provided, so will need to add this in the future.

5) Documentation - initially record any new usage information in this jira, but then can be added to the documentation located here: https://github.com/Governance/rtgov/wiki/_pages (see instructions on how to update the docs here: https://github.com/Governance/rtgov/wiki/DocsReadme)

                
> Activity store implementation for Cassandra
> -------------------------------------------
>
>                 Key: RTGOV-272
>                 URL: https://issues.jboss.org/browse/RTGOV-272
>             Project: RTGov (Run Time Governance)
>          Issue Type: Feature Request
>            Reporter: Gary Brown
>            Assignee: Gary Brown
>             Fix For: 2.0.0.M1
>
>
> Provide a Cassandra implementation of the ActivityStore.

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