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MQSeries.net Forum Index » IBM MQ Java / JMS » How to maintain ordering of messages

How to maintain ordering of messages

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sguhan

Posted: Wed Apr 30, 2003 9:24 am Post subject: How to maintain ordering of messages

Newbie

Joined: 29 Apr 2003
Posts: 3

I have several instances of an application which are pulling messages off an MQ queue. There could be messages for several users and each user can have many messages. The order of messages for a particular user has to be processed in order by the instances. Is there something that I can set in the message header which will let the instances know that there are other messages for the same user? How to maintain the ordering of the messages? Instances of the application grab a message from the MQ Queue Q1, process and put to another queue Q2. When they write to another queue (Q2) they have to put messages in the same order as they were in the original queue (Q1).

jefflowrey

Posted: Wed Apr 30, 2003 9:54 am Post subject:

Grand Poobah

Joined: 16 Oct 2002
Posts: 19981

Use message grouping.

vennela

Posted: Wed Apr 30, 2003 10:00 am Post subject:

Jedi Knight

Joined: 11 Aug 2002
Posts: 4055
Location: Hyderabad, India

There are quite a few fields with which you can achieve what you are trying to.
May be fileds like
MsgSeqNumber
UserId etc. You should look at MQMD fileds in the Application Programming Reference manual.

http://www-3.ibm.com/software/integration/library/manualsa/manuals/crosslatest.html

-------
Venny

sguhan

Posted: Wed Apr 30, 2003 10:40 am Post subject:

Newbie

Joined: 29 Apr 2003
Posts: 3

With the JMS API is there a way to set some identifier?

vennela

Posted: Wed Apr 30, 2003 11:00 am Post subject:

Jedi Knight

Joined: 11 Aug 2002
Posts: 4055
Location: Hyderabad, India

I have never done that with JMS. But looking at the documentation I am getting an impression that it is possbile.

JMSXGroupSeq is mapped to MsgSeqNumber

Refer to Chapter 12 of the Using Java Manual.

GOOD LUCK

-------
Venny

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