I am guessing that the Recieve function on the ActiveMQ message consumer in
the NMS api should return null when no messages are on a queue. I am not
seeing this. I try to check for messages after receive, making sure that
they are not null. What happens is that execution stops at the
consumer.Receive() call, and does not move forward until a message comes
into the queue. 

What I am trying to do is the following: I have a windows service that will
consume messages from a queue. When it starts up I want to try and read all
messages on the queue. Once the initial messages are done being read I want
to have the consumer stop, and another consumer with a MessageListener takes
over. I register the MessageListener on another consumer so that any new
messages that come into the queue will be read asynchronously.

I can make one or the other work, but not both. This is because the Receive
function does not return when there are no messages on the queue I am
reading from.
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