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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