Load spanning by "multiple repliers, only one gets the request"

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At last nights CamPUG meeting, Bryan Cole suggested the idea of allowing 
multiple repliers for a message name, only one of whom will actually get a 
particular request.

This could allow KBUS to do some sort of load balancing, and sounds like 
an interesting concept which would not (at least in its simple form) be 
hard to implement.

So, several Listeners could bind as Load Balancing Repliers (that needs a 
better name) for a particular message name. When the sender sends a 
Request with that name, KBUS chooses one of the LBRs (sorry) to receive 
the message. The simplest algorithm would be to choose the one with the 
shortest messaage queue, and otherwise one at "random".

A more ambitious approach might allow the choice/specification of policy 
for this choice, by some mechanism.

Original issue reported on code.google.com by [email protected] on 3 Mar 2010 at 10:48