[jboss-dev-forums] [Design of JBoss Remoting, Unified Invokers] - Re: Extracting load balancing classes from AS cluster module

[bstansberry@jboss.com]

With the effort underway to consolidate the client side interceptor models (see http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3970879#3970879), need to revisit a bit the LoadBalancePolicy interface.
 
We'd decided earlier to create a simple base interface with only chooseTarget(FamilyClusterInfo fci) and then to leave a legacy subinterface with a method that took o.j.invocation.Invocation as a param.

If we're going to consolidate to a single interceptor model, this raises a few questions:

1) Will we get rid of the subinterface w/ o.j.invocation.Invocation?  (An indirect way of asking whether we'll get rid of the old interceptor model for 5.0, or leave it around for ease of migration.)
2) Will we want a method chooseTarget(FamilyClusterInfo, o.j.aop.joinpoint.Invocation) ?  This will provide an API similar to the old detached invoker model that any custom policies that people wrote can adapt to.
3) If yes to #1 and #2, in the base interface or a subinterface?
4) Another possibility Tom and I discussed is to create an abstraction of the data that would be passed in the Invocation and pass that to the LoadBalancePolicy, thus reducing the coupling to the invocation type.

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