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| Asynch invoke using MQ Binding : How to get MsgId ? |
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| Which approach is suggested? |
| Sol-1 |
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0% |
[ 0 ] |
| Sol-2 |
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100% |
[ 2 ] |
| Other (please explain in comment) |
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[ 0 ] |
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| Total Votes : 2 |
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| Author |
Message
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| satya.sid |
 Posted: Thu Dec 02, 2010 10:52 am Post subject: Asynch invoke using MQ Binding : How to get MsgId ? |
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Novice
Joined: 14 Jan 2009
Posts: 15
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I have an intersting problem which initially thought would be simple. It goes like tis.
Step-1: Process-1 invokes a service in Asynch manner over XML/MQ.
Step-2: Process-1 then store the MQ MsgId in database.
Step-3: Process-2 will pick the resopnse msg. The request msgid is used as the correlation id.
Step-4: Process-2 will update the response msg to database using the correlation id.
Its looks quiete simple but stuck with below points.
Sol-1. If process-1 invokes in Asynch manner , how it can get the MQ MsgId and store in database.
Sol-2. Process-1 could generate the MsgId in process and populate in the MsgId element (smo/headers/MQHeader/md/MsgId) in Request message. But every time it sets and once sent to MQ queue, its overwritten by the QueueManager generated MsgId.
Did anyone solved similar issue. Any help would be much appreciated.
Regards
Satya |
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| fjb_saper |
| Posted: Fri Dec 03, 2010 12:45 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20696
Location: LI,NY
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Well before step 1 finishes and after the message was sent you need to retrieve the messageId from the sent message as long as it is still in scope.
Have fun 
_________________
MQ & Broker admin |
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| JLRowe |
| Posted: Fri Dec 03, 2010 5:26 am Post subject: |
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Yatiri
Joined: 25 May 2002
Posts: 664
Location: South East London
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| SCA should deal with this kind of stuff, correlation of requests and replies. Your code should be agnostic to the transport mechanism underneath, that's the whole point of SCA! |
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| satya.sid |
| Posted: Sat Dec 18, 2010 5:52 pm Post subject: Resolved |
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Novice
Joined: 14 Jan 2009
Posts: 15
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Hi All
Finally its resolved by the Sol-2 aproach... 
Below two points you have to take care if you want MsgId to be generated & set from the Application and then send the msg to Queue.
1. First make sure in the MQ import -> Proporties -> Binding -> Message Confirguration -> Request Message Id option -: "Copy from SCA message".
2. Make sure you are assigning a correct MsgId and in correct manner.
2.1 MsgId should be 48 char HexDecimal String (so that it accomodates in MQBYTE24).
2.2 If using XSLT to assign the MsgId then can do string assignment or custom Java where the method returns correct string format MsgId.
2.3 If using java snippet in custom mediation then may use as below.
| Code: |
smo.setBytes("headers/MQHeader/md/MsgId",MyAppJavaUtil.getMsgIdBytes());
or
smo.setString("headers/MQHeader/md/MsgId",MyAppJavaUtil.getMsgIdString()); |
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