3 Replies Latest reply on Nov 27, 2007 9:35 AM by jay.howell

    Subscription management

    malammik
    malammik Nov 26, 2007 2:26 PM

      I have only been looking into this for several hours and I dont expect a detailed answer. Few sentences to point me in the right direction are much appreciated. I already have downloaded sources for JBM and JGroups.

      Given that topic names are hierarchial, how does JBM store information about durable subsribers?

      Are there any known limitations to maximum number of unique subscriptions?

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        • 1. Re: Subscription management
          jay.howell
          jay.howell Nov 26, 2007 4:46 PM (in response to malammik)

          All Subscriptions are stored just like other queues, in the JBM_PostOffice table. So if you have a topic with 5 durable subscribers, then you will have 5 queues that are stored in the JBM post office table. The name of the queue will be the client id. For instance, I set my client id as Jay for one of my durable subscriptions. The queue created for that subscription is Jay.SubscriptionName . When a message is sent to the topic, the message is then put into each one of the subscription queues.

          Hope this helps.
          Jay:)

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          • 2. Re: Subscription management
            malammik
            malammik Nov 26, 2007 5:42 PM (in response to malammik)

            If I were to create two subscriptions then

            Sports/Baskteball and Sports/*

            JBM is not going to do anything different if I were to create subscriptions

            Foo/bar and Foo/blah

            ?

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            • 3. Re: Subscription management
              jay.howell
              jay.howell Nov 27, 2007 9:35 AM (in response to malammik)

              Currently we don't implement Topic Hierarchies. We have slated that for a task in JBM 2.0.
              http://jira.jboss.org/jira/browse/JBMESSAGING-523

              So the answer to your question is yes.

              There is no release date yet that I know of, for JBM 2.0, but I'm guessing that it will come out between the 1st and 2nd quarter of next year.
              Jay:)

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