[jboss-jira] [JBoss JIRA] Commented: (JBAS-3469) Enhance the BarrierController with the ability to destroy/re-create the Barrier

[Dimitris Andreadis (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBAS-3469?page=comments#action_12349234 ] 
            
Dimitris Andreadis commented on JBAS-3469:
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So this is done (experimentally).

First, there are 2 additional mbean attributes and 2 mbean operations that allow the Barrier to respond with create and destroy state changes:

CreateBarrierHandback
DestroyBarrierHandback

To make the Barrier follow the cycle:

create/start -> stop/destroy -> create/start -> etc

Simply configure the DestroyBarrierHandback, instead of the StopBarrierHandback attribute and you are set.

Also the default initial state for the Barrier is CREATED. In addition, if you want the initial state of the Barrier to *not* be CREATED, you can set the new BarrierCreatedOnStartup flag to false.

This extra bit works, but at deployment time it'll produce an annoying (and bogus) ERROR on the console that the Barrier mbean is NOTYETINSTALLED. It is actually registerd and configured, but not created or started yet. The error is printed because the Barrier is not registered to the ServiceController, until *after* it goes in create state for the first time.

I can fix it but I don't want to mess up with the ServiceController at this point (or until the users complaint).

All changes should be backwards compatible, so it you don't need the extra feature you shouldn't have to change your configuration.




> Enhance the BarrierController with the ability to destroy/re-create the Barrier
> -------------------------------------------------------------------------------
>
>                 Key: JBAS-3469
>                 URL: http://jira.jboss.com/jira/browse/JBAS-3469
>             Project: JBoss Application Server
>          Issue Type: Feature Request
>      Security Level: Public(Everyone can see) 
>          Components: System service
>    Affects Versions: JBossAS-4.0.4.GA
>            Reporter: Dimitris Andreadis
>         Assigned To: Dimitris Andreadis
>             Fix For: JBossAS-4.2.0.CR1
>
>
> Investigate the possibility of having a special configuration that tells the BarrierController to fully destroy and re-create the Barrier. That would allow services that can be destroyed and re-created to be controlled by the Barrier.

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