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From "Ricardo Ramalho (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-3080) Wildcard (*) only matches existing (known) topics at subscription time. Topics created after subscribing are ignored
Date Fri, 10 Dec 2010 11:16:00 GMT
Wildcard (*) only matches existing (known) topics at subscription time. Topics created after
subscribing are ignored
--------------------------------------------------------------------------------------------------------------------

                 Key: AMQ-3080
                 URL: https://issues.apache.org/jira/browse/AMQ-3080
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.5.0
         Environment: RHEL 5, Kernel 2.6.18-128.el5xen, OpenJDK 1.6.0-b09 64-bit
            Reporter: Ricardo Ramalho
             Fix For: 5.5.0


When subscribing to a topic using asterisks (*), only topics that existed prior to subscription
are subscribed. Topics created afterward are ignored.
The > wildcard does not have this behaviour. It also subscribes topics created after the
subscription.

To trigger the bug:

1. Restart ActiveMQ, so that it is started with no topics.

2. Subscribe to *.*.rgr.bam.>

3. Publish to a.b.rgr.bam.a
4. Publish to a.b.rgr.bam.b
5. Publish to a.b.rgr.bam.c

# 3, 4 and 5 will not be visible by 2, because no topics existed when 2 subscribed

6. Kill subscriber 2. Restart it, subscribing again to *.*.rgr.bam.>

7. Publish to a.b.rgr.bam.a
8. Publish to a.b.rgr.bam.b
9. Publish to a.b.rgr.bam.c

# 7,8 and 9 will now be seen by 6, because the topics were created before 6's subscription

10. Publish to a.b.rgr.bam.d
11. Publish to a.b.rgr.bam.e
12. Publish to a.b.rgr.bam.f

# Again, 10, 11 and 12 will not be seen by 6

Final toughts:
If you subscribe to > during this tests, all messages will be received. I beleive this
should also be the behaviour of the * wildcard. 3 and 6 should also see all events.

For the test, I used stompcat to publish, and a small java program to subscribe (using activewire).
I also verified (using tcpdump) that ActiveMQ did not send the missing messages to 3 and 6,
so the problem should be there, not on the client libraries.

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