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MQSeries.net Forum IndexIBM MQ API SupportMatching By Priority

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Gulmohar
PostPosted: Fri Jun 29, 2001 10:36 am Post subject: Reply with quote

Newbie

Joined: 28 Jun 2001
Posts: 1

Hi
We are sending a request message to an application and the application is sending us back 4-5 messages for that request. Within those 4-5 messages, there would be one message with higher priority which will contain the information about those other messages. We want to retrieve this message first. Is there any API directly supporting this?
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bduncan
PostPosted: Fri Jun 29, 2001 4:10 pm Post subject: Reply with quote

Padawan

Joined: 11 Apr 2001
Posts: 1554
Location: Silicon Valley

Why not just batch the 4-5 reply messages as a GROUP, and give your application that is wating for the replies the get message option: ALL_MSGS_AVAILABLE. This way, the MQGET will return nothing until all messages in the group are available, and if you combine with the parameter to always remove grouped messages in order (assuming the first message you created contains the information about the others) then you will remove the first message in the group and it will contain the information about the others that subsequent MQGETs will remove. In fact, if you use message grouping, you might be able to do away with the informational message altogether, assuming it just contains something like the CORRELIDs of the other messages. If you still feel you want to use priorities, you need to keep in mind that message priority is useless if you are matching against some message property. In other words, if you have 100 messages on a queue, 99 of which have a higher priority than the 100th, but you do an MQGET matching against the correlid of the 100th message, it will return to you the 100th message even though it is of a lower priority. The only time that priorities affect things is when the message channel agent is dispatching messages across a sender channel (it dispatches those messages with a higher priority first), and when you are doing MQGETs without any matching parameters (it will return messages of higher priority first - and when there are multiple messages with equal priority, it uses FIFO)....


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