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| How To Check a MQ Q exists or not?? |
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| meriton |
 Posted: Wed Jan 07, 2004 8:08 pm Post subject: How To Check a MQ Q exists or not?? |
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Novice
Joined: 07 Aug 2002
Posts: 24
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I am trying to move msgs from a queue to a list of dynamic queues. To do so, I need to check if the dynamic queue exists first, if yes, I open the queue and move the msgs, if not, I will create the dynamic queue then move the msg. I use accessQueue method to do the check, get an 2085 error every time if no such queue. Any efficient way to check if a dynamic queue exists ( queue name provided).
Follows the code I am using ..
boolean vExisting = false;
String dynamicQName = "CLK.G2B.PHY.DEVL.ISS." + pBatchId;
if (mQMgr != null) {
try {
int vOpenOptions = MQC.MQOO_BROWSE | MQC.MQOO_FAIL_IF_QUIESCING;
MQQueue DynamicQ =
mQMgr.accessQueue(
dynamicQName,
vOpenOptions,
null,
null,
null);
//testing...
if (DynamicQ != null)
vExisting = true;
//end testing...
} catch (MQException MQe) {
if (MQe.reasonCode != 2085)
throw MQe;
} catch (Exception e) {
throw e;
}
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| bower5932 |
| Posted: Thu Jan 08, 2004 6:27 am Post subject: |
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Jedi Knight
Joined: 27 Aug 2001
Posts: 3023
Location: Dallas, TX, USA
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| clindsey |
| Posted: Thu Jan 08, 2004 6:53 am Post subject: |
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Knight
Joined: 12 Jul 2002
Posts: 586
Location: Dallas, Tx
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IMHO, if your intent is to write to the queue if it exists, then the most efficient check is to open the queue. If it exists, you have a valid handle and off you go. If it doesn't exist, then create it. Why spend cycles on a query function that still requires you to follow up with an open anyway?
Put a try/catch specifically around the queue open call and do the open in the catch block when 2085 is thrown. Then you can use the same code flow beyond that for either case.
Hope this helps,
Charlie |
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| bower5932 |
| Posted: Thu Jan 08, 2004 7:59 am Post subject: |
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Jedi Knight
Joined: 27 Aug 2001
Posts: 3023
Location: Dallas, TX, USA
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| I definitely agree with Charlie's point. The only time the inquire might/would come in handy is if you have a large number of queues to try and you know that most of them aren't going to exist. You could get your list ahead of time to save on the opens of the non-existent ones. |
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