[JIRA] Created: (CAY-744) JTA EntityManager

["Andrus Adamchik (JIRA)" <ca...@incubator.apache.org>]

JTA EntityManager
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                 Key: CAY-744
                 URL: https://issues.apache.org/cayenne/browse/CAY-744
             Project: Cayenne
          Issue Type: Task
          Components: Cayenne JPA
    Affects Versions: 3.0
            Reporter: Andrus Adamchik
         Assigned To: Andrus Adamchik
             Fix For: 3.0


Current Cayenne JPA EntityManager is always RESOURCE_LOCAL, i.e. it manages its own transactions via EntityTransaction interface. We need to support the JTA and RESOURCE_LOCAL managers. The details are described in chapter 5.9.2 of the specification. Specifically for JTA EntityManagers:

* When EntityManagerFactory.createEntityManager is invoked, the provider must create and return a new entity manager. If a JTA transaction is active, the provider must register for synchronization notifications against the JTA transaction.
• When EntityManager.joinTransaction is invoked, the provider must register for synchronization notifications against the current JTA transaction if a previous joinTransaction invocation for the transaction has not already been processed.
• When the JTA transaction commits, the provider must flush all modified entity state to the database.
• When the JTA transaction rolls back, the provider must detach all managed entities.

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