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| vasukn |
 Posted: Tue Jan 22, 2002 4:49 pm Post subject: |
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Newbie
Joined: 20 Jan 2002
Posts: 8
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Hi,
I am using MQSeries -java. I have a basic question. Is the correlation_id or message_id is being generated by the MQServer or do we have to program ? (like UIDGeneratio ?) After reading couple of messages I am getting this doubt. Please explain. Also, if we are going to generate the COrrelation_Id or Message_ID manually, how many bytes we should generate ?
Thanks.
-vasukn |
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| cronydude |
| Posted: Wed Jan 23, 2002 3:24 am Post subject: |
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Voyager
Joined: 11 Nov 2001
Posts: 85
Location: US
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hi vasu,
its up to u whether u supply the messageid n correlationid thro' program r not.if u don't supply, its done by the QManager.
regards,
crony |
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| vasukn |
| Posted: Wed Jan 23, 2002 8:45 am Post subject: |
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Newbie
Joined: 20 Jan 2002
Posts: 8
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Thanks for the reply. If it is generated by the system, how can I read the correlation_id before putting the message ?
Thanks.
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| PeterPotkay |
| Posted: Wed Jan 23, 2002 9:09 am Post subject: |
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Poobah
Joined: 15 May 2001
Posts: 7722
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You can't. It is only available to you after the PUT.
_________________
Peter Potkay
Keep Calm and MQ On |
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| EddieA |
| Posted: Wed Jan 23, 2002 1:49 pm Post subject: |
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Jedi
Joined: 28 Jun 2001
Posts: 2453
Location: Los Angeles
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Hi,
Let me correct crony's statement. 
If you specify a MessageId, then MQ will use what you specify. Except for JMS where the MessageID will ALWAYS be genreated by MQSeries, overwritting what you used.
If you do not specify a MessageID, then MQSeries will generate one for you.
In both the above cases, you can read the value of the MessageID back after the PUT.
MQSeries NEVER generates a CorrelationID for you. It ALWAYS honors what you have used, even NULL.
Cheers,
_________________
Eddie Atherton
IBM Certified Solution Developer - WebSphere Message Broker V6.1
IBM Certified Solution Developer - WebSphere Message Broker V7.0 |
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| vasukn |
| Posted: Wed Jan 23, 2002 2:09 pm Post subject: |
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Newbie
Joined: 20 Jan 2002
Posts: 8
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Thanks for the replies.
If MQSeries does not create correlation id then
how dows the MQC.MQPMO_NEW_CORREL_ID option works with
putMessageOptions class ? I guess it creates the correlation_id.
We are using 5.2 version of MQSeries in Java.
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| StefanSievert |
| Posted: Wed Jan 23, 2002 3:55 pm Post subject: |
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Partisan
Joined: 28 Oct 2001
Posts: 333
Location: San Francisco
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Eddie,
I'm afraid your comment on CorrelId is not quite right. All others hit the nail on the head, though! 
Form the Application Programming Reference:
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For the MQPUT and MQPUT1 calls, the application can specify any value.
The queue manager transmits this value with the message and delivers it
to the application that issues the get request for the message.
If the application specifies MQPMO_NEW_CORREL_ID, the queue
manager generates a unique correlation identifier which is sent with the
message, and also returned to the sending application on output from the
MQPUT or MQPUT1 call.
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_________________
Stefan Sievert
IBM Certified * MQSeries
[ This Message was edited by: StefanSievert on 2002-01-23 15:56 ] |
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| EddieA |
| Posted: Thu Jan 24, 2002 11:17 am Post subject: |
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Jedi
Joined: 28 Jun 2001
Posts: 2453
Location: Los Angeles
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Hangs head in shame. 
That's an option (together with MQPMO_NEW_CORREL_ID) that I hadn't spotted before. Looks like I'll have to change my standard answers about MesageId and CorrelID. (Don't ever remember seeing MQPMO_NEW_MSG_ID before either. Hmmmmm, when did they get introduced).
Thanks for pointing it out to me Stefan.
Cheers,
_________________
Eddie Atherton
IBM Certified Solution Developer - WebSphere Message Broker V6.1
IBM Certified Solution Developer - WebSphere Message Broker V7.0 |
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