Re: Durable Topics and message expiry

Ok thanks.

On 10/16/07, Tim Anderson <[email protected]> wrote:
> George H wrote:
> > Hi,
> >
> > I have this idea and I don't know how plausable it is to do with
> > OpenJMS... So i'll run it by here and see the feedback :)
> >
> > I am thinking of implementing a Durable Topic on openjms that will
> > hold a copy of messages that are sent to other clients. I want this
> > topic to keep those messages indefinitely (set expiry date never to
> > expire?) and I don't want the messages to disappear either once a
> > subscriber has read them.
> >
> > The point being to create a "history topic" where subscribers can hook
> > on to it, receive all messages in order from time X to current and
> > then unsubscribe. But they can go back and check out the "history
> > topic" again at any time.
> >
> > I haven't tried to do this but wondering if this is feesable to do
> > with OpenJMS or if not I should just use a separate DB and a query.
> >
> > Thanks.
> >
> OpenJMS holds onto persistent topic messages while there is a durable
> subscriber for the
> topic that has not yet received it.
> To do what you want, you could pre-register a durable subscriber for
> each topic that you want messages
> retained for. This subscriber would never be used, but would ensure
> that  non-expiring messages
> are never discarded.
>
> -Tim
>
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George H
[email protected]

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