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| smdavies99 |
 Posted: Thu Nov 12, 2015 8:37 am Post subject: Every Queue needs to have it's own Listener |
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Jedi Council
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A client told me that their Network Group has said that every MQ Queue needs to have its own listener.
IMHO, I think this is not best practice but can anyone here think of a valid reason why this is good advice.
They are using a very old version of MQ so the security features of V8 don't apply.
Thoughts?
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| Vitor |
| Posted: Thu Nov 12, 2015 8:43 am Post subject: Re: Every Queue needs to have it's own Listener |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| smdavies99 wrote: |
| A client told me that their Network Group has said that every MQ Queue needs to have its own listener. |
Do they not just mean an MDB, which listens on a queue?
Rather than an MDB with a list, which is another and (I understand) discredited practice?
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| vennela |
| Posted: Thu Nov 12, 2015 8:56 am Post subject: Re: Every Queue needs to have it's own Listener |
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Jedi Knight
Joined: 11 Aug 2002
Posts: 4055
Location: Hyderabad, India
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| smdavies99 wrote: |
A client told me that their Network Group has said that every MQ Queue needs to have its own listener.
IMHO, I think this is not best practice but can anyone here think of a valid reason why this is good advice.
They are using a very old version of MQ so the security features of V8 don't apply.
Thoughts? |
MQ Listener doesn't make sense
MDB Listener Port or Activation Specification makes sense but not sure if they are referring to the same
Once, there was a talk in our team where every queue wanted their own trigger monitor, which was very soon argued against |
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| Vitor |
| Posted: Thu Nov 12, 2015 9:05 am Post subject: Re: Every Queue needs to have it's own Listener |
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Grand High Poobah
Joined: 11 Nov 2005
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| vennela wrote: |
| MDB Listener Port or Activation Specification makes sense but not sure if they are referring to the same |
That's certainly the thing I was trying to articulate, and I thank you for the correct term.
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| smdavies99 |
| Posted: Thu Nov 12, 2015 9:06 am Post subject: |
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No MDB's here.
Just MQ and Broker and some Clients connecting to the system.
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| Vitor |
| Posted: Thu Nov 12, 2015 9:32 am Post subject: |
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Grand High Poobah
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| smdavies99 wrote: |
No MDB's here.
Just MQ and Broker and some Clients connecting to the system. |
The clients are not Java MDBs?
In which case the Network Group are hopelessly mistaken.
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| smdavies99 |
| Posted: Thu Nov 12, 2015 9:50 am Post subject: |
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AFAIK, all the clients are using the MQ Client libraries/jar files even if they are written in Java.
There are less than 20 clients connecting so IMHO there is no need for more listeners. Not all of them are connected all the time.
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| PeterPotkay |
| Posted: Thu Nov 12, 2015 10:20 am Post subject: |
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A lot of non MQ people use the term "listener" to describe an app polling a queue. Maybe that is what they are referring to?
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| smdavies99 |
| Posted: Thu Nov 12, 2015 10:36 am Post subject: |
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I get the impression that you might be right.
But they really don't know the product.
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| fjb_saper |
| Posted: Thu Nov 12, 2015 1:24 pm Post subject: |
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Verify that they are using Listener as shorthand for the JMS term MessageListener which is an interface in JMS and needs to be implemented to receive asynchronously messages from the queue.
And yes in this case it would most probably be a good practice to have each queue have it's own MessageListener. 
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| bruce2359 |
| Posted: Thu Nov 12, 2015 2:26 pm Post subject: |
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| fjb_saper wrote: |
Verify that they are using Listener as shorthand for the JMS term MessageListener which is an interface in JMS and needs to be implemented to receive asynchronously messages from the queue.
And yes in this case it would most probably be a good practice to have each queue have it's own MessageListener. |
Not to be confused with a channel listener.
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| gbaddeley |
| Posted: Thu Nov 12, 2015 3:16 pm Post subject: |
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Sometimes non-MQ-savvy folks use "MQ Queue" to refer to a queue manager. If this is the case, 99.9% of queue managers have a MQ listener (aka runmqlsr / MQ LISTENER object).
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