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| sbuster |
 Posted: Wed Oct 22, 2008 6:24 pm Post subject: Browsing messages in a topic |
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Apprentice
Joined: 07 Oct 2008
Posts: 25
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| Is is possible to browse the messages in a topic? |
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| gs |
| Posted: Wed Oct 22, 2008 11:17 pm Post subject: |
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Master
Joined: 31 May 2007
Posts: 254
Location: Sweden
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| Um, what kind of topics are we talking about here - discussion topics in the forum, MQ topics, WMB topics? |
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| sbuster |
| Posted: Thu Oct 23, 2008 2:47 am Post subject: |
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Apprentice
Joined: 07 Oct 2008
Posts: 25
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| Topics defined in MQ. I would like to be able to see the "topic depth", interrogate the details of any specific message in the topic etc. All the thing I can do with MQ Explorer and Queues. |
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| gbaddeley |
| Posted: Thu Oct 23, 2008 6:33 pm Post subject: |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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You mean to see how many published messages are queued on a particular topic string for a particular durable subscriber? Why would you want to know that?
Pub/sub concepts are quite different to FIFO queuing concepts. "Topic depth" is not a meaninful term to MQ.
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Glenn |
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| fjb_saper |
| Posted: Fri Oct 24, 2008 1:34 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20768
Location: LI,NY
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| gbaddeley wrote: |
You mean to see how many published messages are queued on a particular topic string for a particular durable subscriber? Why would you want to know that?
Pub/sub concepts are quite different to FIFO queuing concepts. "Topic depth" is not a meaninful term to MQ. |
It could be meaningful to you, if you get all your subscriptions on a specific queue, but messages for a specific topic are not getting consumed from that specific queue. Any browse action on such a queue should show you what is being left in it.
In gbaddeley's defense, if you do not specify a queue for your subscriptions, you would have to go through all generic subscribers' stuff and that doesn't make much sense....
Enjoy 
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MQ & Broker admin |
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| zpat |
| Posted: Fri Oct 24, 2008 2:25 am Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5867
Location: UK
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AFAIK topics just control where published messages are routed to. The underlying queues can be browsed.
If you wanted to have a copy of messages for a given topic - register a subscription (maybe use a topic alias queue) using a queue that you can browse. |
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| gbaddeley |
| Posted: Sun Oct 26, 2008 5:21 pm Post subject: |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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| zpat wrote: |
AFAIK topics just control where published messages are routed to. The underlying queues can be browsed.
If you wanted to have a copy of messages for a given topic - register a subscription (maybe use a topic alias queue) using a queue that you can browse. |
AKA a "non-managed" subscription, where MQ does not manage the queued subscription messages for you (as it does by default), you have to provide your own local queue name.
It also needs to be a "durable" subscription, so that MQ does not throw away the messages when the subscriber is not running.
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Glenn |
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| mvic |
| Posted: Mon Nov 03, 2008 6:21 pm Post subject: Re: Browsing messages in a topic |
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Jedi
Joined: 09 Mar 2004
Posts: 2080
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| sbuster wrote: |
| Is is possible to browse the messages in a topic? |
If you are a subscriber to a topic, you get messages from the topic, you don't browse them. Of course the underlying implementation may or may not allow you to browse them. But in principle the pub/sub model does not treat the topic as a message store, only as a stream of messages. |
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