Grouping and ordering messages on queue

[damian.sinczak]

Hi,

I didn't read whole JMS specification, so please don't shout if this question is stupid.

Let’s say I have 9 messages that I want to send on queue. And those messages can belong to three different groups: red group, green group and blue group.

RED_GROUP = [message1, message2, message3]
GREEN_GROUP = [message4, message5, message6]
BLUE_GROUP = [message7, message8, message9]

What I want to achieve is to assure that only one message from group is picked up by message driven bean and other messages (from the same group) wait for previous one to process. I don’t care about ordering groups of messages I only care for messages in groups.

[ataylor]

take a look at http://www.jboss.org/file-access/default/members/jbossmessaging/freezone/docs/userguide-1.4.4.GA/html/ordering-group.html for an explanation.

[damian.sinczak]

Thanks, that is almost everything I need. But my another question is, can I create ordering groups dynamically? On the beginning I don't know how many (and what kind) groups there will be, in my case it should be runtime. Is it possible?

[damian.sinczak]

I answered this question by my self. But from what I have noticed this is JBoss specific functionality. I'm using JBoss of course, but I have to use non vendor specific elements in my application.

[ataylor]

I'm not sure i understand whatyou mean. an orderinggroup doesn't have to be created you just set it on the producer or via the connection factory. can you explain what you are trying to do?

[ataylor]

thats correct, grouping is not part of the JMS specification.

[gaohoward]

Strick ordering is something not included in JMS spec 1.1, so that means each vendor are free to implement their own ordering features. you have to use vendor's specific implementation.