Hi there,
you can browse the AdvisorySupport class and navigate from there to
understand
which objects are used to create the Advisory messages.
This having said, the architecture sounds a bit strange to me. One
reason why you use
JMS is to decouple producers and consumers. If I understand correctly
you are trying
to couple the producer to the fact that at least one consumer for a
particular topic exists.
In a publish/subscribe architecture normally a producer publishes
events - important events
persistently and notifications non-persistently. The producer doesn't
(shouldn't) really care
who is connected on the consumer side.
My 2 ct
Andreas
On Apr 28, 2009, at 3:23 AM, dlindquist wrote:
I've been playing with the advisory messages in ActiveMQ --
primarily for the
purpose of avoiding doing the work to build a message if no-one is
listening
on the topic, but also for monitoring clients.
The advisory messages work great for this, but I seem to be missing
where to
find a couple of advisory messages...
First, I can't seem to find any message for when someone
unsubscribes from a
topic (when using a durable connection). This is a bit annoying,
because it
means that I receive NO notification at all when a durable subscriber
decides to no longer receive messages.
Secondly, when I START receiving advisory messages, I get a nice
'flood'
that fills me in on who is listening, even if they've connected long
ago --
this is great, because I don't miss anything that happened while I was
'away'. Unfortunately, I only receive this type of 'catchup'
message for
durable subscribers if they are currently ACTIVELY CONNECTED. I don't
receive anything if they are currently not connected (but are still
'receiving' messages anyway, because they are 'durable').
And lastly, I can determine the subscriber ID of any subscriber
(including
durables), but I can't seem to determine the CLIENT ID, even though
this
seems to be an important part of a durable subscription (ie, the
durable
subscriber is identified by BOTH the client id AND the subscriber id).
Is there any way for me to determine any of these? Or am I trying to
completely bastardize ActiveMQ? ;-)
TIA!
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