April 2002
Intermediate to advanced
318 pages
6h 58m
English
book
MQSeries Programming Patterns
by Mark Perry, Manesh Balachandran, Jorge Plata, Paul Solano, Phillip Thomas
Content preview from MQSeries Programming Patterns
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3.7. Message grouping in MQI
As explained in Chapter 2, “Messaging and the APIs” on page 11, message grouping lets us add some grouping logic to the messages without having to code all that logic into the application. The grouping is managed by the queue manager, and provides basic features such as ordering and group completion control.
The group identification is introduced in the message descriptor structure (MQMD) sent with the message, when using an MQPUT or MQPUT1 call.
Every message in the group must have the MQMF_MSG_IN_GROUP flag but the last one, which has an MQMF_LAST_MSG_IN_GROUP flag instead. The order of the messages in the group is stored in the MsgSeqNumber field of the MQMD structure, which is generated automatically by the queue ...
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