[jboss-dev-forums] [Design of Clustering on JBoss (Clusters/JBoss)] - Re: JBAS-4919 - ha singletons in heterogenous topologies

[bstansberry@jboss.com]

LOL. I pick #1 or #3. :-)

#4 isn't an option -- the code's in EAP; it's supported.

#3 seems to be along the lines of the standard policy in EAP; we don't just fix everything we think of, since the fix could introduce other issues.  We are conservative.

Would #1 be that bad? You create ExtendedHASingletonElectionPolicy with the missing methods from the AS 5 API. If the injected policy implements Extended, you invoke on it the way AS 5 does. Otherwise it gets used as it is now.  In ExtendedHASingletonElectionPolicy javadoc, any HASingletonElectionPolicy methods that don't get called anymore should have comments noting that fact.

Don't get me wrong; I can see how it would get messy. #3 is OK.

I know you did a lot of refactoring to tighten things up in trunk, i.e. with HASingletonElectionPolicyBase; that doesn't need to happen in 4.x, and *shouldn't* happen if it might break some custom subclass. HASingletonElectionPolicySimple just needs to work correctly.

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