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| tricky_knight |
 Posted: Thu Mar 24, 2005 4:07 pm Post subject: sequential messages with MDB's |
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Apprentice
Joined: 12 Mar 2005
Posts: 34
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has anyone ran into the problem where transactions coming into a queue where an MDB is listnening needs to process messages in order? This seems so contradictive to what J2ee and MDB's are all about about
-the only way I see to achieve this is to lower the connections to 1 so it can go only go one a time..
is this the only alternative when using MDB's? |
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| fjb_saper |
| Posted: Thu Mar 24, 2005 6:52 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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Guess so. Haven't seen anybody handling it any differently.
What is the business case behind it ?
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| fjcarretero |
| Posted: Tue Mar 29, 2005 2:06 pm Post subject: |
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Voyager
Joined: 13 Oct 2003
Posts: 88
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I think, MQ doesn't maintain the message order unless you only use one qMgr.
You should have a mechanism to reprocess messages that are out of order.
Check this.
Cheers.
Felipe |
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| malammik |
| Posted: Wed Mar 30, 2005 6:45 am Post subject: |
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Partisan
Joined: 27 Jan 2005
Posts: 397
Location: Philadelphia, PA
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| tricky_knight |
| Posted: Wed Mar 30, 2005 10:12 am Post subject: |
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Apprentice
Joined: 12 Mar 2005
Posts: 34
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| Webpshere Application Server 5.1 |
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| malammik |
| Posted: Wed Mar 30, 2005 10:49 am Post subject: |
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Partisan
Joined: 27 Jan 2005
Posts: 397
Location: Philadelphia, PA
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On 5.x using listener properties, you can configure the listener to process one message at a time. I have had quite a number of cases where this was necessary. For example when processing orders and order updates. You dont want to get an update for an order that has not been processed yet. J2EE mdb allows beans to be abstracted from the messaging layer. I dont think this contradics J2EE architecture. Moreover, you can still get a quite decent performance even processing your messages serially.
_________________
Mikhail Malamud
http://www.netflexity.com
http://groups.google.com/group/qflex |
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| tricky_knight |
| Posted: Wed Mar 30, 2005 12:25 pm Post subject: |
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Apprentice
Joined: 12 Mar 2005
Posts: 34
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Thanks for the reply.
By listener properties you are saying change the parameter for max connections to 1 within the MessageLisneterProperties in the Admin Console, correct? Should you also lower the max connection/max session for the attached QueueConnectionFactory? |
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| fjb_saper |
| Posted: Wed Mar 30, 2005 1:16 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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I'd discuss the last one with the WAS and MQ Admins.
Enjoy  |
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| malammik |
| Posted: Wed Mar 30, 2005 1:39 pm Post subject: |
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Partisan
Joined: 27 Jan 2005
Posts: 397
Location: Philadelphia, PA
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