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Date: Fri, 8 Nov 2013 11:04:45 -0700
Message-ID: 
 <CAKS7T5NJmN+NwR+NMohyo_hej=+aFx_OHDGcQtcmtd77C8tfvA@mail.gmail.com>
Subject: Re: ActiveMQ.DLQ
From: Christian Posta <christian.posta@gmail.com>
To: "users@activemq.apache.org" <users@activemq.apache.org>
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Sure is :)

AbstractRegion.java#send():
does a lookup of the destination...

            final Destination regionDestination =3D lookup(context,
messageSend.getDestination(),false);


in AbstractRegion#lookup() you have this:

        if (dest =3D=3D null) {
            if (isAutoCreateDestinations()) {
                // Try to auto create the destination... re-invoke broker
                // from the
                // top so that the proper security checks are performed.
                context.getBroker().addDestination(context,
destination, createTemporary);
                dest =3D addDestination(context, destination, false);
                // We should now have the dest created.
                destinationsLock.readLock().lock();
                try {
                    dest =3D destinations.get(destination);
                } finally {
                    destinationsLock.readLock().unlock();
                }
            }

            if (dest =3D=3D null) {
                throw new JMSException("The destination " +
destination + " does not exist.");
            }
        }

On Fri, Nov 8, 2013 at 10:43 AM,  <barry.barnett@wellsfargo.com> wrote:
> So there must be some code written in the broker to dynamically create th=
at 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]
> 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 =
send to the DLQ, it will be auto-created. So for example, when the broker c=
hecks for expiring messages upon dispatch, if it finds any it will send the=
m to the DLQ... if that queue, "ActiveMQ.DLQ" is not already in the system =
(it's not on a fresh broker install, for example), then it will be auto-cre=
ated 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
>> either by calling createQueue() or createTopic() on a JMS Session
>> creating an instance of ActiveMQTopic or ActiveMQQueue and possibly
>> registering them in JNDI
>>
>> This still isn't telling me how ActiveMQ knows when to create the Active=
MQ.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 destinati=
ons should be auto-created.. or you can use security to lockdown people fro=
m creating destinations on demand... lots of ways to do it, but by default =
the destinations are auto-created as described in the wiki above.
>>
>> If you want to have destinations created when the broker starts up, you =
could 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 somewh=
ere so that the broker knows how to create it when it's needed?  I don't se=
e 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 Act=
iveMQ.DLQ, or if a consumer listens to the ActiveMQ.DLQ queue, then the bro=
ker will create it.
>>>
>>> You can set up queues ahead of time if you'd like, but it's not necessa=
ry.
>>>
>>>
>>>
>>> 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 ActiveM=
Q.DLQ queue.  When I start the ActiveMQ broker, I do not see the DLQ define=
d.  If this is where the expired messages go to, wouldn't it be a default q=
ueue for the default configuration?  If not, then do I need to define it us=
ing 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 =
of 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


--=20
Christian Posta
http://www.christianposta.com/blog
twitter: @christianposta