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| bower5932 |
 Posted: Wed Sep 10, 2008 7:38 am Post subject: |
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Jedi Knight
Joined: 27 Aug 2001
Posts: 3023
Location: Dallas, TX, USA
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| Rohit_ wrote: |
| How this situation is handled in MQ? |
You need to look into units of work. You would get all of your messages under syncpoint, perform your other work, and then either commit or rollback the messages.
You wouldn't leave messages laying around and try to keep track of what you have or have not processed. |
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| Rohit_ |
| Posted: Wed Sep 10, 2008 11:14 am Post subject: Callback with MQ v6. |
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Novice
Joined: 10 Jan 2008
Posts: 24
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It seems like the only way to implement callback in IBM MQ v6 is thru triggers.
But triggers comes with lots of trade-offs. my MQ v6 server is installed on UNIX platform.any other way where i can implement callback?
or MQ v7 is the only option left? |
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| fjb_saper |
| Posted: Wed Sep 10, 2008 2:22 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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Looks more and more like a pub/sub problem to me. 
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MQ & Broker admin |
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| Rohit_ |
| Posted: Wed Sep 10, 2008 4:02 pm Post subject: |
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Novice
Joined: 10 Jan 2008
Posts: 24
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Yes you can say that.from Biz perspective it's like pub/sub.
So I can implement this with MQSeries Publish/Subscribe broker ?
I don't have to use JMS. while I am reading manual can some please explain
the difference between implementing this way or by using callback function?
am confused,no idea if am making any sense with this question? |
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| Rohit_ |
| Posted: Wed Sep 10, 2008 5:17 pm Post subject: |
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Novice
Joined: 10 Jan 2008
Posts: 24
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No this is not pub/sub problem. messages are not published nor my application needs to subscribe to some Topic.
I don't want to use triggers for other trade offs. and I just need callback function to implement this. |
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| fjb_saper |
| Posted: Wed Sep 10, 2008 8:02 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| Rohit_ wrote: |
No this is not pub/sub problem. messages are not published nor my application needs to subscribe to some Topic.
I don't want to use triggers for other trade offs. and I just need callback function to implement this. |
Define call back function. The nearest that I can think of is the MessageListener in JMS/XMS. In non JMS terms this comes either to a long running program, or a triggered program.
The reason I was leaning towards pub/sub is that you would have multiple receivers get the message and the receivers would be entirely decoupled from each other.
Going back to my rant some posts above: If you browse the message because you need to do something about or with the msg content, there is something wrong in your app design. You should either consume the message or leave it alone.
If you browse the messages to know how many are in the queue, this is a monitoring task and browsing is ill suited for that. Use some monitoring messages (pcf see MS0B) to ask for the queue depth. It's faster and has by far less overhead than browse....
If you browse your messages to see the content and understand what is going on in your app, => that is a development task with human intervention (use rfhutil or some other development tool) and should not be coded for.
And finally if you browse your messages because you only want to consume them when you are sure that some other tasks dependent on message content are completed with success => this is a transactional matter and you are so using the wrong pattern. You should be using single or multiple phase commit.
Enjoy
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| Rohit_ |
| Posted: Thu Sep 11, 2008 6:33 am Post subject: |
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Novice
Joined: 10 Jan 2008
Posts: 24
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fjb_saper,
Yes you are absolutely right. My application has to just consume messages.
Now I am bound to use MQ v6 and in Non JMS context I have two options to consume messages async.
a)Triggers
b)A continous running thread,which notify my application on arrival on new message.
incase,if you are aware of some sample code please let me know.
(program to continous poll queue,and notify parent application)
many thanks. |
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| mqjeff |
| Posted: Thu Sep 11, 2008 6:41 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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If you have to ask where to find sample code, you are not paying *any* attention at all.
Please try harder. |
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