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| A question about Request- and Response-Queue |
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| thomas2004 |
 Posted: Fri Nov 14, 2008 4:50 am Post subject: A question about Request- and Response-Queue |
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Novice
Joined: 13 Nov 2008
Posts: 16
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I am new to WebSpere MQ. I am a little bit confused with Request- and Response-Queue.
I think, request or response is relative. Assumed two applications appA and appB communicate with each other via MQ-queues. The situation looks as below:
Request_Queue
appA -------------------------> appB
Response Queue
<-------------------------
If appA send request to appB, it will put message into the "Request-Queue" and get response from "Response-Queue".
But if the appB send request to appA, to which queue it should put the message? To "Response-Queue"? |
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| Vitor |
| Posted: Fri Nov 14, 2008 5:56 am Post subject: Re: A question about Request- and Response-Queue |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| thomas2004 wrote: |
| But if the appB send request to appA, to which queue it should put the message? To "Response-Queue"? |
Request / Reply is unidirectional. You'd set up another pair of request / reply queues to service the reverse directions.
You could do a few funky things with correlation ids, but not if you're new to MQ.
Remember that MQ has no internal concept of request / reply queues; it's just how your application is using them. There's no reason why a queue can't receive request messages, datagrams or anything else.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| Mr Butcher |
| Posted: Fri Nov 14, 2008 5:58 am Post subject: |
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Padawan
Joined: 23 May 2005
Posts: 1716
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under normal conditions, an application will not be requester and responder, it will be one of both.
however, you can take the same queues, you can take different queues, it depends on your setup, your naming conventions, your security, your application design,.......
if your setup is as simple as you posted, then - yes - application B must put into response queue for application A to get the request, but in that case you will get confused by the names (please put your request in my resonse queue, so that i can send my response into your request queue)
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Regards, Butcher |
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| zpat |
| Posted: Fri Nov 14, 2008 6:11 am Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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| Also the request message should have the replytoqueue name in the MQMD. |
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