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From Joe Fernandez <>
Subject Re: Introducing delay on a Consumer
Date Fri, 10 Jul 2009 12:46:00 GMT

What about using a prefetch limit of 1 in combination with client


mkonda wrote:
> I got a specific issue - I need to introduce a delay in sending a message
> to a second consumer. Let me explain:
> There are two consumer on one Destination. A user is connected to only one
> of these consumers at any time. So, if one consumer is doing process (say,
> BUSY), the users are routed to the second consumer. 
> The flow is like this:
> First consumer will receive the message. It then changes its state to BUSY
> so users are routed to second consumer. It does the some process upon
> receiving the message (while the second consumer shouldn't receive at all
> but serves the users though).
> Once the first consumer finishes the process, the second consumer should
> receive the same message. So, the second consumer becomes BUSY while first
> consumer now servers the users. It does same process as first consumer.
> BOTH consumers are EXACTLY SAME - they do the EXACT process. The only
> difference is that - only one of the consumers will be exposed to the
> external client.
> So, my question is - is there a way to ask the Second consumer to pick up
> the message only when first consumer finishes?
> (Remember that the processing will swap from first to second consumer and
> from second consumer to first)
> Any thoughts (I'll sincerely appreiate)

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