[jboss-jira] [JBoss JIRA] Commented: (JBCACHE-726) PojoCache to replicate static field variable

[Ben Wang (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBCACHE-726?page=comments#action_12346577 ] 
            
Ben Wang commented on JBCACHE-726:
----------------------------------

Couple points here:

1. It is possible for JBoss Aop to intercept static fields, e.g.,

class POJO{ 
   static int field; 
} 

<bind pointcut="field(int POJO->field)"> 
    <interceptor class="xxxx"> 
</bind>
 or

<bind pointcut="field(static int POJO->*)"> 
    <...> 
</bind>

or with annotation

<bind pointcut="field(static int POJO->@XXX)"> 
    <...> 
</bind>

2. Static field's lifecycle is global scope, meaning, once it is initialized, it won't get GC-ed. So along this line, we can say, if a static field needs replication, during a write access, we put the static field into a global region in the PojoCache. Once it is in, any further read access will be intercepted. And during startup, JBoss Aop will introduce a StaticFieldInterceptor to perform interception. This is at the class level.

3. The global region can be located outside of any region. Note that this approach won't work with buddy replication where sub-region scope is required.


> PojoCache to replicate static field variable
> --------------------------------------------
>
>                 Key: JBCACHE-726
>                 URL: http://jira.jboss.com/jira/browse/JBCACHE-726
>             Project: JBoss Cache
>          Issue Type: Feature Request
>      Security Level: Public(Everyone can see) 
>          Components: PojoCache
>            Reporter: Ben Wang
>         Assigned To: Ben Wang
>            Priority: Critical
>             Fix For: PojoCache 2.1.0
>
>
> There may be use cases that staic field variable is not final nor constant. In this case, can we replicate that field? The problem is static variable is global scoped, so where should we store it under? Maybe a separate area for global space, but this will break BR, btw.

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