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Date: Tue, 21 Mar 2006 00:17:03 +0000
From: "James Strachan" <james.strachan@gmail.com>
To: activemq-users@geronimo.apache.org
Subject: Re: JMSPriority and retrieving message from queue by priority
In-Reply-To: <441F383F.6060906@exist.com>
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References: <e2c016550603201427s1b96abb7qae82ef3b1205e4f8@mail.gmail.com>
	 <441F383F.6060906@exist.com>

Agreed - I think the easiest way of working with JMS priorities (which
few JMS providers implement well) is just to use a selector on
subscriptions using the JMSPriority header.

e.g. run lots of consumers with a selector of something like

 JMSPriority > 4

then a small number for low priority messages etc. This then gives you
very fine grained control over what resources you give to different
priority messages.

James

On 3/20/06, Adrian Co <aco@exist.com> wrote:
> Hi Kerry,
>
> You might consider using JMS headers and message selectors to implement
> message priority handling.
>
> Refer to this forum thread: http://forums.activemq.org/posts/list/443.pag=
e
>
> Regards,
> Adrian Co
>
> Kerry Todyruik wrote:
>
> >Hi,
> >
> >I am fairly new to JMS and ActiveMQ. I was thinking that it would be use=
ful
> >to use a JMS queue as a priority queue, retrieving messages by priority
> >rather than order of addition. I'm not sure where to go with this. Shoul=
d I
> >be able to do this with ActiveMQ? Can I set up a queue to order messages=
 by
> >the JMSPriority field?
> >
> >If this is possible, could somebody point me to some documentation or
> >provide an example?
> >
> >If it is not possible, what are some reasonable options? I could build m=
y
> >own DB-backed queue. I also thought that it might be possible to dynamic=
ally
> >route messages from one queue to one of 9 queues, one for each JMSPriori=
ty
> >value and then synchronously check these queues in order of priority. Do=
es
> >that sound like a reasonable solution?
> >
> >Thanks,
> >Kerry Todyruik
> >
> >
> >
>
>


--

James
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