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| bazooka |
 Posted: Tue Mar 31, 2009 10:59 pm Post subject: How to get the depth of an alias queue? |
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Newbie
Joined: 31 Mar 2009
Posts: 3
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hi guys, currently, i have this kind of issue, i can us MQC.MQOO_INQUIRE and CurrentDepth()to get the depth of the queue( which is a local queue)
but my program seems cannot work if the queue is a alias queue(the base is also a local queue)
any one knows why and how?
many thanks  |
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| Mr Butcher |
| Posted: Wed Apr 01, 2009 1:13 am Post subject: |
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Padawan
Joined: 23 May 2005
Posts: 1716
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| Quote: |
| any one knows why and how? |
because it works as documented:
| Quote: |
| If the object being inquired is an alias queue, the attribute values returned by the MQINQ call are those of the alias queue, and not those of the base queue to which the alias resolves. |
(taken from the APR manual)
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Regards, Butcher |
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| mqjeff |
| Posted: Wed Apr 01, 2009 2:11 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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| Why are you writing a program to inquire the depth of a queue? |
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| zpat |
| Posted: Wed Apr 01, 2009 2:52 am Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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| Inquire on the base queue name attribute of the alias queue then open the base queue for inquire on queue depth (if you must). |
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| gbaddeley |
| Posted: Wed Apr 01, 2009 5:10 pm Post subject: |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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| mqjeff wrote: |
| Why are you writing a program to inquire the depth of a queue? |
A nice leading question. One of my favourites. Tell us, bazooka. I can almost smell the answer.
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Glenn |
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| bazooka |
| Posted: Wed Apr 01, 2009 5:41 pm Post subject: |
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Newbie
Joined: 31 Mar 2009
Posts: 3
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haha, i fixed, now i point to the local queue~~
well, I understand this is not a good way to write such a program. but user just request to do it like this...
they just want to use the depth to control the whole flow..... 
which i told them, it's not a godo idea. |
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| bazooka |
| Posted: Wed Apr 01, 2009 5:43 pm Post subject: |
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Newbie
Joined: 31 Mar 2009
Posts: 3
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| but thanks guys, you r cool~ really give me some good points:D |
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| kevinf2349 |
| Posted: Wed Apr 01, 2009 6:47 pm Post subject: |
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Grand Master
Joined: 28 Feb 2003
Posts: 1311
Location: USA
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| bazooka wrote: |
haha, i fixed, now i point to the local queue~~
well, I understand this is not a good way to write such a program. but user just request to do it like this...
they just want to use the depth to control the whole flow.....
which i told them, it's not a godo idea. |
Then trigger on depth...use the force Luke! |
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| gbaddeley |
| Posted: Thu Apr 02, 2009 4:50 pm Post subject: |
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Jedi Knight
Joined: 25 Mar 2003
Posts: 2538
Location: Melbourne, Australia
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| bazooka wrote: |
well, I understand this is not a good way to write such a program. but user just request to do it like this...
they just want to use the depth to control the whole flow.....
which i told them, it's not a godo idea. |
Be insistent and educate them about how to use MQ. If you let it go, you may regret it in the future.
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Glenn |
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| Vitor |
| Posted: Thu Apr 02, 2009 10:50 pm Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| bazooka wrote: |
| but user just request to do it like this... |
Your user should provide a business requirement, not a technical solution.
| bazooka wrote: |
they just want to use the depth to control the whole flow.....
which i told them, it's not a godo idea. |
Be sure to read up on the various discussions of this in the forum, so when the program doesn't work as they want you can explain why without having to research it. It'll make you look good. 
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| bruce2359 |
| Posted: Fri Apr 03, 2009 8:12 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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Application developers not familiar with MQ concepts will assume that they must first determine if there is a message in the queue (MQINQ), and if there is a message, then MQGET the message. Two MQI calls when one would accomplish the same thing, namely: MQGET (with a WAIT - different discussion).
With one call: if there is a message in the queue, the call completes and returns a rc=0 (usually); if not, the call completes and returns a rc=2033 (no message available).
Two calls is twice the workload of one call (if my basic math skills have survived).
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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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| Vitor |
| Posted: Fri Apr 03, 2009 9:07 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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And of course there are those instances when the MQINQ call returns the wrong depth.....
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| bruce2359 |
| Posted: Fri Apr 03, 2009 9:47 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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| Quote: |
| returns the wrong depth... |
Of course, MQINQ always returns the correct depth. The challenge for the developer is understanding what depth means at the precise instant when the MQINQ returned it.
Now, where did I leave those invisible messages...?
_________________
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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| Vitor |
| Posted: Fri Apr 03, 2009 10:09 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| bruce2359 wrote: |
| Of course, MQINQ always returns the correct depth. The challenge for the developer is understanding what depth means at the precise instant when the MQINQ returned it. |
Yes, yes, ok.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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