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From: <barry.barnett@wellsfargo.com>
To: <users@activemq.apache.org>
Subject: RE: ActiveMQ.DLQ
Thread-Topic: ActiveMQ.DLQ
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Date: Fri, 8 Nov 2013 17:43:29 +0000
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So there must be some code written in the broker to dynamically create that=
 queue then, correct?  And other system type queues?

Regards,

Barry Barnett
WMQ Enterprise Services & Solutions
Wells Fargo
Cell: 704-564-5501


-----Original Message-----
From: Christian Posta [mailto:christian.posta@gmail.com]=20
Sent: Friday, November 08, 2013 12:21 PM
To: users@activemq.apache.org
Subject: Re: ActiveMQ.DLQ

Well, it would be the same as a user-queue... ie.. if something tries to se=
nd to the DLQ, it will be auto-created. So for example, when the broker che=
cks for expiring messages upon dispatch, if it finds any it will send them =
to the DLQ... if that queue, "ActiveMQ.DLQ" is not already in the system (i=
t's not on a fresh broker install, for example), then it will be auto-creat=
ed just like a user queue is.

On Fri, Nov 8, 2013 at 9:26 AM,  <barry.barnett@wellsfargo.com> wrote:
> After reading the wiki, I see the following:
>
> This means that a client can create a new Queue or Topic dynamically=20
> either by calling createQueue() or createTopic() on a JMS Session=20
> creating an instance of ActiveMQTopic or ActiveMQQueue and possibly=20
> registering them in JNDI
>
> This still isn't telling me how ActiveMQ knows when to create the ActiveM=
Q.DLQ.  Are you saying that the client would have to dynamically create it,=
 or again, is it something at the server side system config that's telling =
it to create a DLQ if messages cant be delivered, expired, etc?
>
> Regards,
>
> Barry Barnett
> WMQ Enterprise Services & Solutions
>
>
> -----Original Message-----
> From: Christian Posta [mailto:christian.posta@gmail.com]
> Sent: Friday, November 08, 2013 9:57 AM
> To: users@activemq.apache.org
> Subject: Re: ActiveMQ.DLQ
>
> Nope :)
>
> http://activemq.apache.org/how-do-i-create-new-destinations.html
>
> But it's completely configurable.. ie, you can specify whether destinatio=
ns should be auto-created.. or you can use security to lockdown people from=
 creating destinations on demand... lots of ways to do it, but by default t=
he destinations are auto-created as described in the wiki above.
>
> If you want to have destinations created when the broker starts up, you c=
ould do something like this in the activemq.xml file:
>
>  <broker xmlns=3D"http://activemq.apache.org/schema/core">
>
>     <destinations>
>
>       <queue physicalName=3D"FOO.BAR" />
>
>       <topic physicalName=3D"SOME.TOPIC" />
>
>     </destinations>
>
>   </broker>
>
>
> but it's not necessary....
>
> On Fri, Nov 8, 2013 at 5:58 AM,  <barry.barnett@wellsfargo.com> wrote:
>> Thank you.  But doesn't it have to be in some configuration file somewhe=
re so that the broker knows how to create it when it's needed?  I don't see=
 it in the activemq.xml file.
>>
>> Regards,
>>
>> Barry Barnett
>> WMQ Enterprise Services & Solutions
>>
>>
>>
>> -----Original Message-----
>> From: Christian Posta [mailto:christian.posta@gmail.com]
>> Sent: Thursday, November 07, 2013 3:00 PM
>> To: users@activemq.apache.org
>> Subject: Re: ActiveMQ.DLQ
>>
>> Barry,
>>
>> ActiveMQ by default auto-creates destinations as it needs/requires them.=
 You don't have to define the DLQ explicitly. If a message goes to the Acti=
veMQ.DLQ, or if a consumer listens to the ActiveMQ.DLQ queue, then the brok=
er will create it.
>>
>> You can set up queues ahead of time if you'd like, but it's not necessar=
y.
>>
>>
>>
>> On Thu, Nov 7, 2013 at 11:17 AM,  <barry.barnett@wellsfargo.com> wrote:
>>> It is my understanding that expired messages are stored on the ActiveMQ=
.DLQ queue.  When I start the ActiveMQ broker, I do not see the DLQ defined=
.  If this is where the expired messages go to, wouldn't it be a default qu=
eue for the default configuration?  If not, then do I need to define it usi=
ng that exact name?  What other attributes would I define the queue with?
>>>
>>> I don't see this queue in my activemq.xml file or any config file out o=
f the box...
>>>
>>>
>>> Regards,
>>>
>>> Barry Barnett
>>> WMQ Enterprise Services & Solutions
>>> W
>>>
>>>
>>>
>>
>>
>>
>> --
>> Christian Posta
>> http://www.christianposta.com/blog
>> twitter: @christianposta
>
>
>
> --
> Christian Posta
> http://www.christianposta.com/blog
> twitter: @christianposta


--
Christian Posta
http://www.christianposta.com/blog
twitter: @christianposta