RE: Durable consumers

In OpenJMS, TopicSubscribers only receive messages published from the time that they were initially 
created.
You should be able to administratively create a durable subscriber for the topic and then use 
TopicSession.createDurableSubscriber(topic, yourDurableSubscriberName, selector, ....)
to receive the message when required. 
I haven't actually tried this approach - let me know if it works/doesn't work.

The other alternative is to use queues. In OpenJMS, QueueReceivers receive all messages,
regardless of when the receiver was created.
You can construct QueueReceivers on the fly with a selector which selects the message
you want.

Regards,

Tim
  -----Original Message-----
  From: openjms-developer-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org [mailto:openjms-developer-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org]On Behalf Of Wang Ting
  Sent: Friday, January 17, 2003 12:30 PM
  To: [email protected]; Sanjeev Aggarwal; openjms-developer-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
  Subject: RE: [openjms-developer] Durable consumers


  Dear Tim,

  I am always thinking about this case:

  If I want to recieve a message which was already produced ( Meanwhile, the message filter is dynamic, and so I have to create the temporary subscirber/listener to recieve messages ), how can I do?

  1) Maybe 'Durable' is the way to resolve it. However, it is useless that the application just creates a durable subscriber after the generation of the specified message.

  Finnally, I have to confirm that the time to register a tempory subscriber is prior to the generation of message.

  2) How about the usage of TTL?


  Thanks.

  Best Regards,
  Wang Ting

    -----Original Message-----
    From: openjms-developer-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org [mailto:openjms-developer-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org]On Behalf Of Jim Alateras
    Sent: 2003年1月17日 4:05
    To: Sanjeev Aggarwal; openjms-developer-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
    Subject: RE: [openjms-developer] Durable consumers


    Hi,

      Currently I was using SonicMQ. In that if there is any durable consumer for a Topic, it was not necessary that messages should be persistent. SonicMQ itself sees, if there is any durable consumers for a Topic, it stores the messages until it delievers the messages to all of its durable consumers.

      But in OpenJMS , durable consumers of a Topic receives messages only if messages sent on that Topic are persistent. Is it OK, or I am doing something wrong.

      [jima] you should also be able to send persistent and non-persistent messages to duirable consumers. You can test it by doing the following

      1. runconsumer.bat -topic topic1 -name sub1
      2. runpublisher.bat -topic topic1 -count 1
      3. runpublisher.bat -topic topic1 -count 1 -persistent

      In the consumer window you should see

      [1 of 0] JMSDeliveryMode=NON_PERSISTENT, Priority=3, JMSMessageID=ID:6532260848592745480
      [2 of 0] JMSDeliveryMode=PERSISTENT, Priority=0, JMSMessageID=ID:P7292479881129131912