[jboss-jira] [JBoss JIRA] Commented: (JBMESSAGING-1416) Provide complete message ordering

[Howard Gao (JIRA)]

    [ https://jira.jboss.org/jira/browse/JBMESSAGING-1416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12459650#action_12459650 ] 

Howard Gao commented on JBMESSAGING-1416:
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Hi Fusayuki,

"Would you elaborate "not to support selector at all" a little more, please?
If JBM ignores the Ordering Group when we create consumers with selectors, it is fine for us.
If JBM throws exceptions, then we cannot use the queues with JBoss ESB."

--- If we turn Ordering Group on, it always tries to keep strick ordering of the messages. Using selectors on ordering group will not result in exceptions, but may result in messages never being delivered.

"Let me explain our background using with message selectors.
For request-replay message pattern, we should specify connection factory names for a JBoss ESB service.
But we can only specify one connection factory name applying both for request and reply queues.
In other words, we cannot simply specify a connection factory name only for the reply queue.

So we would like to use the queues with selectors even though it breaks FIFO.
Could you just ignore the message ordering when using with selectors, as if Ordering Group is not used?"

--- I don't understand the use case. If ordering can be ignored, why we turn it on? We just use normal delivery.
Can you give a very simple concrete case where ordering and selector are both needed and also must be used together?
I don't think single connection factory would be a problem, because we can use JBossMessageProducer's API to control ordering, if you don't want ordering all over the connection factory scope.



> Provide complete message ordering
> ---------------------------------
>
>                 Key: JBMESSAGING-1416
>                 URL: https://jira.jboss.org/jira/browse/JBMESSAGING-1416
>             Project: JBoss Messaging
>          Issue Type: Feature Request
>            Reporter: Tim Fox
>            Assignee: Howard Gao
>             Fix For: 1.4.0.SP3.CP08, 1.4.4.GA
>
>
> As per customer request we would like to introduce new functionality over and above the JMS ordering guarantees.
> The idea is that the user should be able to determine an "ordering group". This can be done by setting a reserved property on the message before sending.
> The ordering group can be pinned to the producer or just be some other arbitrary string.
> In order to guarantee strict ordering, even on rollback or in the presence of multiple consumers or with xa transactions, the queue needs to ensure that no more than one message with the value of ordering group is being delivered at any one time.
> When that message has been acked, or cancelled the next one can be delivered.
> This is of course will provide a performance penalty since we won't be able to do consumer buffering, but that's the price you pay if you want such a strict ordering guarantee.
> We can subclass our MessageQueue class to do this. The sub-classed class can maintain a map of ordering group-->boolean. Which will determine whether the queue is currently delivering any messages with that ordering group value. It will consult that map when delivering to decide whether it can deliver the next message.

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