When messages are transmitted via ActiveMQ presumably there is some form of
queuing (pun definitely intended) of messages behind the scenes to provide
the greatest likelihood that messages will make it to their destinations
(the degree of which is controlled by various configuration settings).  I
assume that this is true regardless of whether the destination is a queue or
topic.  I am using topics to enforce the publisher/subscriber paradigm.

My questions are:

- Is there queuing on the publisher (writer) side?
- Is there queuing on the subscriber (reader) side?  I assume the answer
here is yes.
- Is there a way to configure (via the config file or programmatically at
run-time), the depth(s) of these queues?  If so, how and what are the
details of what can be configured?
- Is it possible to implement a policy that forces the "oldest" entry off
the queue so that newer entries can be enqueued?

Thank you.




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