The MQ provider could keep track of the redelivery counter.. but yes..
that looks good.
Regards,
Hiram
>From: Peter Antman <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: [EMAIL PROTECTED]
>Subject: Re: [JBoss-dev] Improving MDB behavior in the presence of delivery
>failures
>Date: Fri, 17 Aug 2001 15:31:10 +0200 (CEST)
>
>On 17 Aug, Hiram Chirino wrote:
> >
> >
> >>Problem is here:
> >>
> >>Is it not so, that the only way to ack the message (inspite of the fact
> >>that it should be marked as roolback) to actually do a trans.commit()
> >>here.
> >>
> >>But this is not possible, since that would also try to commit any faulty
> >>bean, or am I wrong here.
> >>
> >>Or is it possible to delist the XAResource, start a new transaction and
> >>make that commit?
> >>
> >>In that case we could probably do dead queue handling here.
> >>
> >
> > ah.. I see the problem.. I guess an easier way to do dead letter
>handling
> > is to make sure jboss mq is marking its message resends and when the
>Invoker
> > sees that a message has been resent x times, then it bypasses the bean
>and
> > places it on the dead letter queue.
> >
> > Regards,
> > Hiram
> >
>
>OK, I get it (I think).
>
>Pseudocode:
>
>In JMSContainerInvoker:
>
> public void onMessage(final Message message)
> {
> // assert message != null;
>
> if (log.isDebugEnabled()) {
> log.debug("processing message: " + message);
> }
>
>Here is the new logic:
> if(message.getJMSRedelivered()) {
> id = message.getJMSMessageID();
> if ( idchecker.howManyTimesRedelivered(id ) > maxRedeliver)
>{
> placeMessageOnDeadLetterQueue( message );
> return;// The bean is never invoked - will transaction be
>OK
> }
> }
>
>
> Object id;
> try {
> id = message.getJMSMessageID();
> } catch (JMSException e) {
> // what ?
> id = "JMSContainerInvoker";
> }
>
> // Invoke, shuld we catch any Exceptions??
> try {
> invoker.invoke(id, // Object id - where used?
> ON_MESSAGE, // Method to invoke
> new Object[] {message}, // argument
> tm.getTransaction(), // Transaction
> null, // Principal
> null); // Cred
> }
> catch (Exception e) {
> log.error("Exception in JMSCI message listener", e);
> }
> }
>
>//Peter
> >
> > _________________________________________________________________
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>--
>Jobba hos oss: http://www.tim.se/weblab
>------------------------------------------------------------
>Peter Antman Technology in Media, Box 34105 100 26 Stockholm
>Systems Architect WWW: http://www.tim.se
>Email: [EMAIL PROTECTED] WWW: http://www.backsource.org
>Phone: +46-(0)8-506 381 11 Mobile: 070-675 3942
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