[jboss-dev-forums] [Design of Messaging on JBoss (Messaging/JBoss)] - Re: JBMESSAGING-519 - Failover(HA) design discussion

[bstansberry@jboss.com]

Regarding use of aspects for handling failover/loadbalancing, have a look at the following classes in the AS aspects module, o.j.aspects.remoting package:

1) ClientChooserInterceptor -- client side aspect.
2) ReplicantsManagerInterceptor -- server side aspect that propagates cluster topology changes back to the client as response metadata.
3) ClusteredRemoting.  This is a class that creates proxies that uses these interceptors.

EJB3 uses the first two.  It doesn't actually use ClusteredRemoting; rather it does similar things in its own more specialized proxy factories.

These classes import the main loadbalancing stuff from the AS cluster module. I've gotten a version of that load balancing stuff extracted out into a separate project that can be checked in. For background on that see 
http://www.jboss.com/index.html?module=bb&op=viewtopic&t=89015

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