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| Back out queue question. |
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| velocity |
 Posted: Thu Sep 09, 2010 5:03 am Post subject: Back out queue question. |
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Centurion
Joined: 30 Nov 2007
Posts: 126
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Hi guys.
How will application know that messages are on the back out queue? Does monitoring / triggering help in this case?
Thanks a lot. |
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| Vitor |
| Posted: Thu Sep 09, 2010 5:11 am Post subject: Re: Back out queue question. |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| velocity wrote: |
| How will application know that messages are on the back out queue? |
Because the application put them there. 
The backout queue is provided for the convience of the reading application when it encounters a poison message. It's not used by WMQ (though some applcation containers like WAS work it on behalf of the application). If, as I suspect, your question would be better worded as "how does the application that processes the backout queue know there are messages on it", then the answer is the same way any application knows about messages on a queue. All the normal rules apply, and all the normal methods work. So....
| velocity wrote: |
| Does monitoring / triggering help in this case? |
Yes they can, if these are the design patterns you choose.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| bruce2359 |
| Posted: Thu Sep 09, 2010 5:32 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9472
Location: US: west coast, almost. Otherwise, enroute.
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A backout queue is just another queue used by the application to separate "good" messages from "poison" messages.
Your application must get/browse the message, look at the backout-count field in the MQMD for this particular message. If it is greater than 0, then the message has been backed out.
What you do with poison messages is application specific.
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ב''ה
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