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Error Handling in MQ PubSub

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ashu

Posted: Tue Dec 18, 2007 10:03 pm Post subject:

Centurion

Joined: 11 Nov 2006
Posts: 132

rohiddev wrote:

The 3 subscribers are MDB's listening to the same listener port. The listener port is setup with connection factory jndi name and destination jndi name referring topic connection factory and topic
How would I feed only Subscriber B the corrected message using the same input Queue?"

MDB
<ejb-jar id="ejb-jar_ID">
<display-name>Message</display-name>
<enterprise-beans>
<message-driven id="Message">
<ejb-name>Message</ejb-name>
<ejb-class>com.amfam.mdb.MessageBean</ejb-class>
<transaction-type>Container</transaction-type>
<message-driven-destination>
<destination-type>javax.jms.Topic</destination-type>
</message-driven-destination>
</message-driven>
</enterprise-beans>
</ejb-jar>

Regards,
Rohid

Actually I had guessed that they would be MDBs. I beg your pardon but creating three Queues would mean that the message will have to replicated at the publisher level...moreover creation of three queues might be costly(correct if I am wrong)...

One solution could be to maintain some state in the MDB as to what was the last Message it processed. This way if Subsciber B requests the retransfer of the message, the other two will not reprocess it. This is assuming that all the three have already read the message but B could not process it. If B hasn't read it from the topic then the message stays on the topic till all the subscribers read it and there is no problem.
_________________
Ashu

"It is simple to be Happy but difficult to be Simple"

fjb_saper

Posted: Wed Dec 19, 2007 4:03 am Post subject:

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20768
Location: LI,NY

This is wrong in oh so many ways.

Doesn't matter and particularly if the subscribers are MDB's I would like each to have it's own queue to listen to. The cost for 2 additional queues is insignificant and irrelevant in this set up
The only way to have one queue to listen to is for scalability: i.e. multiple instances of the same MDB listening to the same queue.

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MQ & Broker admin

Vitor

Posted: Wed Dec 19, 2007 4:36 am Post subject:

Grand High Poobah

Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA

ashu wrote:

It's a bit anti-pattern. If publisher and subscriber are decoupled, then so should all the subscribers be unaware of each other. At best it smacks of message affinity.
_________________
Honesty is the best policy.
Insanity is the best defence.

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