[Springframework-developer] JMS remoting provider available

[<jas...@ma...>]

I've hacked together a JMS provider of the remoting layer in Spring, 
which works like the HTTP, JAX-RPC & Caucho implementations but which 
uses JMS for the underlying networking code.

By using JMS we can now load balance requests for a service across 
multiple service endpoints; so we can easily implement a cluster of 
servers complete with load balancing and auto fail-over. Currently this 
assumes a state-less service model. We may wish to implement something 
a little more clever for stateful services (and how to fail-over in a 
cluster of stateful services), but this is a first cut which should be 
quite useful for clusters of stateless services - we could layer on top 
some kind of stateful mechanism. Some JMS providers have features like 
'exclusive queues' or 'message groups' which can be used to provide 
stateful-like routing of messages similar to those used in EJB 
containers for stateful session beans.


The code is pretty straightforward; just 3 classes, so I took the 
cheeky approach of checking it straight into the main code branch 
rather than leaving it spend time in the sandbox first; we can easily 
move it into the sandbox if need be.

Where possible the makes use of the existing JmsTemplate code. To 
simplify the implementation code I used the QueueRequestor, but we 
could tidy that up later and use explicit send() / receive() instead to 
be able to support configurable timeouts and timeToLive values on a 
remote request etc.

Any feedback or thoughts are most welcome

James
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