[jboss-jira] [JBoss JIRA] Updated: (JBCACHE-404) Provide API to allow multiple callers to safely call activateRegion() .

[Brian Stansberry (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBCACHE-404?page=all ]

Brian Stansberry updated JBCACHE-404:
-------------------------------------

    Fix Version/s: 2.0.0.BETA2
                       (was: 2.0.0.BETA1)

> Provide API to allow multiple callers to safely call activateRegion() .
> -----------------------------------------------------------------------
>
>                 Key: JBCACHE-404
>                 URL: http://jira.jboss.com/jira/browse/JBCACHE-404
>             Project: JBoss Cache
>          Issue Type: Feature Request
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 1.2.4SP1, 1.2.4
>            Reporter: Brian Stansberry
>         Assigned To: Brian Stansberry
>            Priority: Minor
>             Fix For: 2.0.0.BETA2
>
>
> If a caller calls activateRegion() and the region is already active, they will get a RegionNotEmptyException.  Need to add an API to make it easy for use cases where multiple callers may want to activate the same region.
> Use case for this is ClusteredSSO.  Multiple ClusteredSSO valves can be running in the same server; all share the /SSO region.  The TreeCache is shared with session replication, so the activateRegion API needs to be used.  Currently it catches the RegionNotEmptyException, but I don't like this in the ClusteredSSO code.
> Possibilities:
> 1) Add an isRegionActive() method, callers can check first.  But this can lead to race conditions.
> 2) Overload the activateRegion method with a version that won't throw the RegionNotEmptyException.
> Don't want to get rid of the RegionNotEmptyException, as in many uses cases (e.g. session repl) the region should not have data; if it does that's an error condition the application should know about.

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