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| kash3338 |
 Posted: Tue Jun 02, 2009 4:41 am Post subject: Inserting at beginning of queue (top of queue) |
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Shaman
Joined: 08 Feb 2009
Posts: 709
Location: Chennai, India
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Hi,
Is there any way by which i can insert a message at the beginning of the queue through my ESQL code?
Though the basic concept of queue is FIFO, there is something called as Double-Ended queue. I just want to know if this kind of concept is available in MQ-MB, to insert a message at the beginning of the queue rather than at the end? |
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| Vitor |
| Posted: Tue Jun 02, 2009 4:44 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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The only mechanism available is the message priority. Note that the sending application doesn't "insert" the message in WMQ, the software delivers it.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| kash3338 |
| Posted: Tue Jun 02, 2009 4:53 am Post subject: |
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Shaman
Joined: 08 Feb 2009
Posts: 709
Location: Chennai, India
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| Vitor wrote: |
| The only mechanism available is the message priority. Note that the sending application doesn't "insert" the message in WMQ, the software delivers it. |
Can you please explain me how to set the Message Priority for each message? |
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| mqjeff |
| Posted: Tue Jun 02, 2009 4:55 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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| kash3338 wrote: |
| Vitor wrote: |
| The only mechanism available is the message priority. Note that the sending application doesn't "insert" the message in WMQ, the software delivers it. |
Can you please explain me how to set the Message Priority for each message? |
With a SET statement, at least in ESQL. That sets the Priority field, on the MQ Message Descripter.
Doing this is meaningless unless the app reading the queue is using priority. |
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| Vitor |
| Posted: Tue Jun 02, 2009 4:58 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| kash3338 wrote: |
| Vitor wrote: |
| The only mechanism available is the message priority. Note that the sending application doesn't "insert" the message in WMQ, the software delivers it. |
Can you please explain me how to set the Message Priority for each message? |
It's a property of the message, set according to how the language you're using deals with the MQMD (it's a different method between C & Java for instance).
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| kash3338 |
| Posted: Tue Jun 02, 2009 5:37 pm Post subject: |
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Shaman
Joined: 08 Feb 2009
Posts: 709
Location: Chennai, India
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| How do i set the priority of a message in MQMD through ESQL? |
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| AkankshA |
| Posted: Tue Jun 02, 2009 7:50 pm Post subject: |
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Grand Master
Joined: 12 Jan 2006
Posts: 1494
Location: Singapore
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SET OutputRoot.MQMD.Priority = <number you want to assign>
but make sure receiving application is picking the message in priority order and not in FIFO
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| fjb_saper |
| Posted: Tue Jun 02, 2009 8:00 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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| kash3338 wrote: |
Can you please explain me how to set the Message Priority for each message? |
Your question doesn't make much sense. If you set priority on each message they will still be delivered FIFO within the priority.
A queue is not a stack. May be you would be better served with message expiry. 
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MQ & Broker admin |
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| kash3338 |
| Posted: Wed Jun 03, 2009 4:56 am Post subject: |
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Shaman
Joined: 08 Feb 2009
Posts: 709
Location: Chennai, India
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| AkankshA wrote: |
SET OutputRoot.MQMD.Priority = <number you want to assign>
but make sure receiving application is picking the message in priority order and not in FIFO |
Hi AkankshA, Thanks for your reply. I just want to know this,
How can we get the messages by priority through MQGet? |
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| zpat |
| Posted: Wed Jun 03, 2009 5:45 am Post subject: |
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Jedi Council
Joined: 19 May 2001
Posts: 5866
Location: UK
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You don't.
MQ will present them in priority order if the queue is so ordered (and you don't use other match criteria).
It's possible to make an application use priority with NO code changes by using alias queues for different MQPUT apps with different default priority values and the receiver queue has priority order.
As if by magic - you can get different priority by simply choosing a different alias queue name for the PUT. |
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