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| The order in whcih exits are called |
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| Anuradha Bose |
 Posted: Thu Jan 08, 2004 9:36 pm Post subject: The order in whcih exits are called |
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Newbie
Joined: 08 Jan 2004
Posts: 7
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Hello
If I have security, message & send exits, then
I know they are called in that order. But does anyone know what order API exit (e.g MQPUT exit) will be called in reference to all these exits?
Also is there a problem running any of these channel exits and API exits together?
a. bose |
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| JasonE |
| Posted: Fri Jan 09, 2004 2:33 am Post subject: |
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Grand Master
Joined: 03 Nov 2003
Posts: 1220
Location: Hursley
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The api exits get called very early on in the processing of an MQ message so I would guess they get called first. Note they also get called as a result of API's within MQ when passing the messages around etc.
There should be no problem mixing exits - they are all independant, but of course this may depend on what you code the exit to do! |
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| Anuradha Bose |
| Posted: Fri Jan 09, 2004 8:01 am Post subject: |
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Newbie
Joined: 08 Jan 2004
Posts: 7
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Thanks for the reply
I am planing to change message payload in MQPUT exits. Was wondering if that will mess up other exits running on the system.
Also, on the same lines, I was wondering what happens if I change the message payload of a REFERENCE message.B'cos the doc. says that reference messages are used in conjunction with message exits, if I change mesasge payload (i.e. add something in front of it as a header) then reference messages will not work correctly? Presumably in mesasge exit the user is expecting the *original* message, ya?
Should I assume, this is the order the exits get called:
On sending side:
API exit - security-message-send
On receiving side:
receive exit-message-security-API exit
thanks again |
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| EddieA |
| Posted: Fri Jan 09, 2004 9:33 am Post subject: |
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Jedi
Joined: 28 Jun 2001
Posts: 2453
Location: Los Angeles
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Taking your 2 questions from the 1st paragraph.
If you change the payload in the MQPUT exit, then this is what all the other exits will see, as this exit would (should  ) be called ahead of the others. Just as if your application wrote the 'modified' payload. They won't know any different.
For a reference message, when you actually do the PUT, there is NO payload. All you write is the header. It's the responsibility of the Message exit on the Channel to actually add the payload to the message for transmission. So, if you want to add some extra data, then that might  work, as long as your Message exits know of it.
Cheers,
_________________
Eddie Atherton
IBM Certified Solution Developer - WebSphere Message Broker V6.1
IBM Certified Solution Developer - WebSphere Message Broker V7.0 |
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