[jira] [Commented] (OLINGO-580) Support JTA based transactions in JPA processor

["Chandan V.A (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OLINGO-580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14358322#comment-14358322 ] 

Chandan V.A commented on OLINGO-580:
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Following section explains the steps that needs to done for enabling OData JPA Processor from not handling the transactions on its own, rather rely on the Application/Container to handle the Transaction. OData JPA processor however will default to *_RESOURCE_LOCAL_* based transactions when following steps are not done.

1) Application that require transaction other than RESOURCE_LOCAL needs to implement the interface *_org.apache.olingo.odata2.jpa.processor.api.ODataJPATransaction_*. 
2) The implementation needs to be registered with the OData service factory by overriding the method *_setODataJPATransaction_*. The method is part of Abstract class *_org.apache.olingo.odata2.jpa.processor.api.ODataJPAServiceFactory_*.
3) Applications that does not inherit from ODataJPAServiceFactory but would like to use the JPA Processor features, can register the implementation of ODataJPATransaction as an *_ODataCallback_*. Implement the method *_getCallback_* of abstract class *_org.apache.olingo.odata2.api.ODataServiceFactory_*.

Olingo JPA Processor for all modifying calls does the following
1) Tries to get ODataJPATransaction managed by application. If there is no implementation found for ODataJPATransaction by application, it defaults to ODataJPATransactionLocalDefault.
2) If the transaction is active, Olingo JPA Processor will not begin/commit/rollback the transaction. If the transaction is not active then Olingo JPA Processor will begin/commit/rollback the transactions.

Applications can choose to manage the transaction scope by beginning the transaction by invoking the method *_begin_* on ODataJPATransaction and close the transaction by *_commit_* or *_rollback_*.



> Support JTA based transactions in JPA processor
> -----------------------------------------------
>
>                 Key: OLINGO-580
>                 URL: https://issues.apache.org/jira/browse/OLINGO-580
>             Project: Olingo
>          Issue Type: New Feature
>          Components: odata2-jpa
>    Affects Versions: V2 2.0.3
>            Reporter: Chandan V.A
>            Assignee: Chandan V.A
>             Fix For: V2 2.0.4
>
>         Attachments: OLINGO-580.diff
>
>
> Olingo V2 JPA processor supports RESOURCE_LOCAL based transaction. Enhance the processor to support JTA based transactions.



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