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| ankurlodhi |
 Posted: Wed Sep 21, 2011 5:58 am Post subject: Why are channels exits used |
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Master
Joined: 19 Oct 2010
Posts: 266
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I hurd of channel exits, channel security exits, i read about them,
i understand that they are for security , but i am still confused,
what is a channel exit program in simple words ? what does it do.
and where is it suitable to use a channel exit program. |
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| bruce2359 |
| Posted: Wed Sep 21, 2011 6:29 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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Read the WMQ Intercommunications manual.
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Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| Vitor |
| Posted: Wed Sep 21, 2011 6:30 am Post subject: Re: Why are channels exits used |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| ankurlodhi wrote: |
| what is a channel exit program in simple words ? what does it do. |
It's an exit program called by the channel MCA at defined points in the processing. It does whatever it's coded to do, like any program. Like most exits (not just WMQ ones) there are strict rules concerning them.
To preempt your next post, the same is true of the other WMQ exits.
| ankurlodhi wrote: |
| where is it suitable to use a channel exit program. |
It's only possible to use exits where the software calls them.
If you meant when is it suitable to use them, one good answer is "only when you've tried everything else"; another is "when you've bought them from someone who provides support". Exits are an advanced topic; a badly written exit will reduce the effectency and throughput of your WMQ system. An incorrectly written exit will bring your WMQ system down in flames.
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Honesty is the best policy.
Insanity is the best defence. |
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| ankurlodhi |
| Posted: Wed Sep 21, 2011 6:48 am Post subject: |
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Master
Joined: 19 Oct 2010
Posts: 266
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| hmmm ok, right now i am working on my basics a bit more, i guess i will give it a try when i will get done with my current role of implementaion of MQ 7 on some servers. everyone is saying its a rare opertunity, to setup servers by your own hands. |
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| Vitor |
| Posted: Wed Sep 21, 2011 7:03 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| ankurlodhi wrote: |
| everyone is saying its a rare opertunity, to setup servers by your own hands. |
I think "everyone" is trying to make you feel better.
You will find as you go through your WMQ career that this oppertunity is not as rare as all that. 
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Honesty is the best policy.
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| ankurlodhi |
| Posted: Wed Sep 21, 2011 10:49 am Post subject: |
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Master
Joined: 19 Oct 2010
Posts: 266
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hmmm but its a gud. experience to move forward, i get to learn many things atleast,
I read those things which would seem boring to me, if it would have been just because of no reason. |
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| bruce2359 |
| Posted: Thu Sep 22, 2011 4:46 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9469
Location: US: west coast, almost. Otherwise, enroute.
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An exit is a place in IBM-supplied code that allows for additional code (user-written or vendor-supplied) to be executed that can alter the default behavior of the IBM code.
As documented in the WMQ Intercommunications manual, there are a few exit-points available in the MCA code. A search here will yield information from other posts as to some of the functions that others have implemented in channel exits.
One such use would be (for auditing purposes) to capture to a file the messages sent across an MQ channel.
_________________
I like deadlines. I like to wave as they pass by.
ב''ה
Lex Orandi, Lex Credendi, Lex Vivendi. As we Worship, So we Believe, So we Live. |
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| ankurlodhi |
| Posted: Thu Sep 22, 2011 5:21 am Post subject: |
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Master
Joined: 19 Oct 2010
Posts: 266
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Thanks for the explanintion bruce.
now i understand it better.  |
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| SAFraser |
| Posted: Sun Sep 25, 2011 8:10 am Post subject: |
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Shaman
Joined: 22 Oct 2003
Posts: 742
Location: Austin, Texas, USA
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Another common use is a channel exit that, upon a connection attempt, calls an executable that tests the connection attempt against values you have configured. I believe the most common implementation of this is a utility called BlockIP2, written and maintained (as freeware) by a few wonderful admins in Europe. Google it to learn more.
You are right, you do have a good opportunity to learn MQ by building (rather than just reading). Good luck.
(You did find the MQ Primer out in Redbooks, I hope? It's old but it is such a good overview for a newbie.) |
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| bruce2359 |
| Posted: Sun Sep 25, 2011 4:35 pm Post subject: |
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Poobah
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Location: US: west coast, almost. Otherwise, enroute.
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