Yes, that's pretty much it. If you want to guarantee ordering you'll
have to do it with some intelligent interface between transactional
participants and the backend "datastore" (queue in this case). Or, use
JBossTS ;-)
Mark.
Tim Fox wrote:
Thanks.
This means that if I create 2 JMS XASessions, enlist them in a global
tx, then receive messages 1, 2, 3 with session 1, and messages 4, 5, 6
in session2, then rollback the global tx, the messages will end up
back in the queue, but for some transaction managers the order in the
queue will be 1, 2, 3, 4, 5, 6, but for others it might be 4, 5, 6, 1,
2, 3.
I guess this doesn't matter since the JMS message order guarantee
doesn't apply after rollback anyway, but good to know.
I guess some users (wrongly) might expect messages to go back in the
queue in the order they were consumed.
Mark Little wrote:
No, there's no guaranteed order (it can be different between
transaction instances and between commit phases). None of the
standards provide for it (going back beyond X/Open), and in fact
that's one of the reasons synchronizations were introduced as a
separate protocol (to guarantee ordering). So JTA or JTS won't help
you here. However, if you want to look at JBossTransactions
specifics, then that can help you: we give you full control over the
ordering of participants.
Mark.
Tim Fox wrote:
One of you transaction gurus may know the answer:
If I enlist 2 (or more) XAResources into a JTA transaction.
Transaction tx = tm.getTransaction();
tx.enlistResource(res1);
tx.enlistResource(res2);
Then I rollback the transaction, which causes rollback() to be
called on each of the XAResources.
Are there any guarantees on the order in which rollback() is called
on the resources, or is this up to the transaction manager
implementation?
E.g. is rollback always called in the same order the resources were
enlisted?
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