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From Nuno Oliveira <nuno.olive...@geo-solutions.it>
Subject Multiple virtual topics and messages routing to consumers
Date Mon, 14 Mar 2016 17:05:50 GMT
Hi,

I have a doubt regarding virtual topics and how the messages are routed (replicated) to the
consumers (queues).

I'm using two virtual topics one with the default name (VirtualTopic.>) and another
one named VirtualTopic.MIGRATION.

I have three consumers (queues):

  * Consumer.2b36ad7a-e641-496d-b319-85000c36d13c.VirtualTopic.>
  * Consumer.e5e60abd-1a66-43f5-8588-842e429b4c5c.VirtualTopic.>
  * Consumer.48ebcaa5-f11b-4de4-a850-2ff45174f83b.VirtualTopic.MIGRATION

My expectation would be that messages send to topic VirtualTopic.> would be send to queues:

  * Consumer.2b36ad7a-e641-496d-b319-85000c36d13c.VirtualTopic.>
  * Consumer.e5e60abd-1a66-43f5-8588-842e429b4c5c.VirtualTopic.>

and that messages send to topic VirtualTopic.MIGRATION would be send to queue:

  * Consumer.48ebcaa5-f11b-4de4-a850-2ff45174f83b.VirtualTopic.MIGRATION

So far I was not able to make things work that way.

I have try different virtual destinations configurations: 

    <destinationInterceptors>
        <virtualDestinationInterceptor>
            <virtualDestinations>
                <virtualTopic name="VirtualTopic.MIGRATION" prefix="Consumer.*.VirtualTopic."/>
                <virtualTopic name="VirtualTopic.>" prefix="Consumer.*.VirtualTopic."/>
            </virtualDestinations>
        </virtualDestinationInterceptor>
    </destinationInterceptors>

but no look. Messages send to topic VirtualTopic.MIGRATION are replicated to queues:

  * Consumer.2b36ad7a-e641-496d-b319-85000c36d13c.VirtualTopic.>
  * Consumer.e5e60abd-1a66-43f5-8588-842e429b4c5c.VirtualTopic.>

but not to queue:

  * Consumer.48ebcaa5-f11b-4de4-a850-2ff45174f83b.VirtualTopic.MIGRATION

The only way I manage to make this work more or less was using some tag in the consumers name
and use the 
prefix to filter by that tag. 

This makes me ask, is it not possible to route messages to queues only based on the topic
name ?

Unfortunately I cannot change consumers names (that are generated randomly) so using only
the prefix is not option.  

I'm using ActiveMQ release version 5.9.0. 

Any comments on this will be appreciated.

Thank you,

Nuno Oliveira

-- 
==
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==
Nuno Miguel Carvalho Oliveira
@nmcoliveira
Software Engineer

GeoSolutions S.A.S.
Via di Montramito 3/A
55054  Massarosa (LU)
Italy

phone: +39 0584 962313
fax:   +39 0584 1660272
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http://www.geo-solutions.it
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