[jboss-jira] [JBoss JIRA] Closed: (JBAS-4049) Consider removing Subject mixin from FIELD granularity session Pojos

[Brian Stansberry (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBAS-4049?page=all ]

Brian Stansberry closed JBAS-4049.
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    Fix Version/s:     (was: JBossAS-5.0.0.Beta2)
       Resolution: Done

Decided to implement the cache listener approach due to JBAS-4067.  For now Subject/Observer logic remains to make it technically possible to share pojos across sessions (which is not advised) but if users don't add the Subject mixin FIELD granularity repl will still work.

> Consider removing Subject mixin from FIELD granularity session Pojos
> --------------------------------------------------------------------
>
>                 Key: JBAS-4049
>                 URL: http://jira.jboss.com/jira/browse/JBAS-4049
>             Project: JBoss Application Server
>          Issue Type: Task
>      Security Level: Public(Everyone can see) 
>            Reporter: Brian Stansberry
>         Assigned To: Brian Stansberry
>             Fix For: JBossAS-4.2.0.CR1
>
>
> FIELD granularity replication uses a Subject mixin to the pojo to notify the session when an attribute is changed.
> Consider dropping this in place of having the CacheListener detect the cache change and notify the session (via the JBossCacheManager).
> Pro:
> 1) Simpler instrumentation. Classes instrumented a la the PojoCache examples (which don't add the Subject mixin) will work. The PojoCache examples can be the sole reference point for how to instrument classes.
> 2) For sure detects all changes in the pojo.  Not sure if the Subject thing catches changes to collections of non-pojos.
> Con:
> Perhaps a bit slower, as the mechanism to look up and notify the session is more cumbersome.

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