[jbossseam-issues] [JBoss JIRA] Updated: (JBSEAM-1144) Make org.jboss.seam.util.Transactions a seam component

Tue Apr 10 19:25:58 EDT 2007

     [ http://jira.jboss.com/jira/browse/JBSEAM-1144?page=all ]

Michael Youngstrom updated JBSEAM-1144:
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    Attachment: seam-tx-2.zip

Here is a second try at a Transaction component.

I added a JpaTransaction components and it appears to work great with the jpa booking example removing any dependence on a JTA implementation.

To enable this I had to do a little more moving fanagling of SeamPhaseListener.  I ended up putting SeamPhaseListener back the way it is in CVS and changed TransactionalSeamPhaseListener to start a transaction AFTER restore view instead of BEFORE restore view.  I don't think this will cause many problems since a Seam Conversation scoped persistence context won't even be available during before restore view.  And it hasn't appeared to effect anything in the booking example.

I included entire instances of the heavily changed files for easier review in this bundle.

Mike

> Make org.jboss.seam.util.Transactions a seam component
> ------------------------------------------------------
>
>                 Key: JBSEAM-1144
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-1144
>             Project: JBoss Seam
>          Issue Type: Feature Request
>          Components: Core
>    Affects Versions: 1.2.1.GA
>            Reporter: Michael Youngstrom
>             Fix For: 1.3.0.BETA1
>
>         Attachments: seam-tx-2.zip, seam-tx.patch
>
>
> I know this is probably a loaded issue but please hear me out. :)  It would be nice if org.jboss.seam.util.Transactions was replaced with a Seam Component just like everything else in Seam.  This would allow for pluggable Transaction Management providers and pave the way for support for Spring Managed Transactions, JPA Local Transactions, and true Hibernate Local Transactions.  This will allow Seam applications to run without a dependency on microcontainer in tomcat and allow for tighter Framework integration with spring and others.
> I would personally be more than willing to do the work of making the an initial JTATransaction component(s) as a replacement for org.jboss.seam.util.Transactions and would also create a SpringTransaction component as a proof of concept for extending the Transaction component.
> One problem I can see off hand is we may have to interact with a transaction in some places where a Seam ApplicationContext is not available.  However, I wonder if confining Seam transactions to a seam call might help simplify matters anyway?  For example transaction cleanup could take place in the @Destroy of the transaction component instead of in the ExceptionFilter?
> Also, this wouldn't be looked at as a JTA replacement but rather a service abstraction.  Just like any other java webapp if you're using enterprise services such as EJBs or JCA JTA would be required.  if you're running on tomcat or some other simple web container a resource local transaction manager (Spring's abstraction, JPA's, or Hibernate's) can be used.
> I'm sure there are tons of other problems I'm not looking at but worst case scenario this issue would be a great place to document them and to refer rejected feature requests. (for example JBSEAM-1118)
> What do you think?
> Mike

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