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From "Michael Dick (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (OPENJPA-159) Make ManagedRuntime amenable to more transaction execution strategies
Date Fri, 25 Apr 2008 20:25:55 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-159?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Dick resolved OPENJPA-159.
----------------------------------

       Resolution: Fixed
    Fix Version/s: 1.2.0

Under svn revision 651441 I added a doNonTransactionalWork method to the ManagedRuntime interface.
Here's the relevant signature : 

    /**
     * <P>
     * Do a unit of work which will execute outside of the current managed
     * transaction.
     * </P>
     * <P>
     * If the runnable object encounters an exception it should be wrapped in a
     * RuntimeException and thrown back to the caller
     * </P>
     * 
     * @param runnable
     *            The runnable wrapper for the work that will be done. The
     *            runnable object should be fully initialized with any state
     *            needed to execute.
     * 
     * @throws NotSupportedException
     *             if the transaction can not be suspended.
     */
    public void doNonTransactionalWork(Runnable runnable)
            throws NotSupportedException;

Currently the interface is only used when we obtain a sequence value from a sequence table
(see TableJDBCSeq.java). The default implementation, found in AbstractManagedRuntime will
merely suspend, execute, then resume the current transaction. 

Subclasses can further refine this behavior and to take advantage of vendor specific hooks.
An example has been provided for WebSphere Application Server under OPENJPA-159.

> Make ManagedRuntime amenable to more transaction execution strategies
> ---------------------------------------------------------------------
>
>                 Key: OPENJPA-159
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-159
>             Project: OpenJPA
>          Issue Type: Sub-task
>          Components: jdbc, kernel
>            Reporter: Patrick Linskey
>            Assignee: Michael Dick
>             Fix For: 1.2.0
>
>
> OpenJPA occasionally needs to perform work in a non-business transaction (see AbstractJDBCSeq.java).
In a transactional environment, one way that this is achieved is by suspending the current
JTA transaction, starting a new one, doing the work, cleaning up the new tx, and resuming
the original one. Some environments do not allow direct transaction control, but mechanisms
such as stateless session beans can often be used to kick off atomic operations that should
execute in a separate transaction.
> We could easily add ManagedRuntime.executeInNewTransaction(Runnable) that captured this
slightly-coarser-grained transaction control. The default implementation could simply do 
suspend(), begin(), invoke Runnable.run(), commit()/rollback(), resume().

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