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From "Guido Anzuoni (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JDO-445) Add convenience method that returns a PersistenceManager proxy
Date Fri, 22 Dec 2006 11:06:23 GMT
    [ http://issues.apache.org/jira/browse/JDO-445?page=comments#action_12460433 ] 
            
Guido Anzuoni commented on JDO-445:
-----------------------------------

The simple approach would be no transaction no PM.
If we would try a more sophisticated approach, try to consider the scenario where 
you begin with a ordinary PM and then you begin a global transaction.
Suppose you get a PM without a global transaction and begin to modify some objetcs and flush.
At his point (considering for simplicity a RDBMS backend) the PM should have started
a local transaction on the DataSource Connection acquired.
Now you begin a global transaction.
What to do now ?
In this case you could not "join" the global transaction but you should complete the local
one.
But, what happen to the DataSource Connection itself used to operate until now ?
Its corresponding XAResource is enlisted ?
Is still possible to commit() the local transaction on the Connection ?

For the second point, I would say that is sufficient to have a TransactionManager, that can
be
setup even in a J2SE environment






> Add convenience method that returns a PersistenceManager proxy
> --------------------------------------------------------------
>
>                 Key: JDO-445
>                 URL: http://issues.apache.org/jira/browse/JDO-445
>             Project: JDO
>          Issue Type: New Feature
>          Components: api2, api2-legacy
>            Reporter: Michelle Caisse
>         Assigned To: Craig Russell
>             Fix For: JDO 2 maintenance release 1
>
>         Attachments: PMProxy-patch.txt
>
>
> In Chapter 8, add a convenience method that returns a PersistenceManager proxy that can
be used in web and ejb containers to dynamically bind to the transaction-associated PersistenceManager.

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