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| Does WMQ implement TOPIC as a Queue (structure-level) |
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| sharadyadav75 |
 Posted: Tue May 18, 2010 3:40 pm Post subject: Does WMQ implement TOPIC as a Queue (structure-level) |
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Newbie
Joined: 18 May 2010
Posts: 2
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Hi,
When using JMS, we can setup Queues & Topics. I was wondering if WMQ internally. Logically, I think topics offer everything that a queue does and hence am guessing that WMQ might be using the same data structure (with some variations) for implementing a topic and a queue.
Is my conjecture correct? Please do let me know. 
Thanks! |
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| gbaddeley |
| Posted: Wed May 19, 2010 4:43 pm Post subject: |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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Internally, WMQ v7 implements the pub/sub feature using TOPIC objects, QLOCAL objects and SUB objects. Pub/sub messages are stored on QLOCALs, so they all the normal features of non-pub/sub messages. Management of publishers and subscribers is done using messages stored on "SYSTEM" QLOCAL objects. TOPICs provide an administration point for various attributes and security. SUB objects allow legacy apps to be subscribers by associating a topic string with a QLOCAL that they read. Does that answer your conjecture?
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Glenn |
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| sharadyadav75 |
| Posted: Thu May 20, 2010 3:26 pm Post subject: Does WMQ implement TOPIC as a Queue (structure-level) |
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Newbie
Joined: 18 May 2010
Posts: 2
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Thanks Glen!
Is there some place where I can read more about these data structures? |
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| mvic |
| Posted: Thu May 20, 2010 3:59 pm Post subject: Re: Does WMQ implement TOPIC as a Queue (structure-level) |
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Jedi
Joined: 09 Mar 2004
Posts: 2080
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MQ uses queues to hold publication messages intended to be retrieved by subscribers.
That's what one would expect. Particularly for durable subscribers. Not necessarily for non-durable subscribers, I suppose. But yes, queues are used to hold publications intended for non-durable subscribers too.
So your conjecture is correct.
gbaddeley mentions TOPIC objects in the queue manager which are really nothing to do with how the publication messages are held. But as he says, they are "administration points".
The place you would go to read about MQ is the Information Center. Search the internet or perhaps use the links at the top of the mqseries.net pages. |
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