Clever Geek Handbook

WebSphere MQ message history

My application communicates with another system via IBM Websphere MQ. Sometimes a message does not come to my queue, but another system says they have already been sent to me. So I want to know how to keep history for all messages coming into my queue.

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The only other way I can think of is using the channel output.



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Keep in mind that it can still traverse the network as the MQ architecture can have many mid-tier queues. Likewise, there is no need to immediately transmit the message over the channel - the sender can batch messages and send them using a trigger.

The best way to ensure that you log everything that comes in is with a queue of interceptors.



This is the queue (let's call it A) that the channel is written to and until this change is read by your application. Then you have a transfer process that reads from A, writes a message, and writes it to the second queue (B). This second queue is what your application is now reading.

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You can put a log statement at the end of the queue so that as soon as you receive the message, you dump the contents into the log. That way, if the other system says they sent a message, all they have to do is tell you when you can look in your log and see if a message came from them around that time.

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