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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (AMQ-2779) Propagate queue subscription selectors to virtual topic dispatch such that unmatched messages do not pile up on subscription queues
Date Mon, 14 Jun 2010 16:27:52 GMT

     [ https://issues.apache.org/activemq/browse/AMQ-2779?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Tully resolved AMQ-2779.
-----------------------------

    Resolution: Fixed

implemented in r954540

> Propagate queue subscription selectors to virtual topic dispatch such that unmatched
messages do not pile up on subscription queues
> -----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-2779
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2779
>             Project: ActiveMQ
>          Issue Type: New Feature
>          Components: Selector
>    Affects Versions: 5.3.2
>         Environment: all
>            Reporter: Gary Tully
>            Assignee: Gary Tully
>             Fix For: 5.4.0
>
>
> With virtual topics each consumer can get its own queue or share an existing queue. http://activemq.apache.org/virtual-destinations.html
> Consumers which share a queue, can use selectors to partition the consumer queue but
individual consumers that use selectors run into a problem in that the dispatch to the queue
does not take account of the selector and all messages are dispatched to the queue. Over time,
the unmatched messages build up on the queue.
> Through static configuration it is possible to arrange that the destination queues are
filtered, but this solution is static.
> An alternative approach, that does impose a cpu hit during dispatch (as the selectors
are executed twice) can provide a neat solution. Making a virtual topic selectorAware allows
the destination interceptor to only dispatch messages that match the selector of one of the
existing subscriptions. In this way, no unmatched messages will be dispatched to the subscription
queues. In xml configuration, the following will make all topic dispatch respect the selectors
of the existing subscriptions:{code}
> <broker xmlns="http://activemq.apache.org/schema/core">
>     <destinationInterceptors>
>       <virtualDestinationInterceptor>
>         <virtualDestinations>
>           <virtualTopic name=">" selectorAware="true"/>
>         </virtualDestinations>
>       </virtualDestinationInterceptor>
>     </destinationInterceptors>
>   </broker>{code}

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