QueueSize and InFlightCount on a Topic keeps growing

[Gaurav Hariani]

I have a non-persistent Topic with a single producer (Java-JMS) and 
multiple non-durable consumers (written in C# NMS)

Looking at the Topic in jconsole I notice the following:
  1. The QueueSize on the Topic is the same as the EnqueueCount  and
     keeps increasing with each new message.
  2. The InFlightCount stays around zero for a while, but then starts
     to increase (the value being the difference between DequeueCount
     and DispatchCount
  3. Eventually the consumers stop receiving any new messages.

Can anyone explain what these various values represent and what might be 
causing this behaviour?

I'm using ActiveMQ 5.0

Thanks

Gaurav