[jboss-jira] [JBoss JIRA] Commented: (JBAS-5615) Synchronization mutex for clustered environments

[Nick Belaevski (JIRA)]

    [ https://jira.jboss.org/jira/browse/JBAS-5615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12473514#action_12473514 ] 

Nick Belaevski commented on JBAS-5615:
--------------------------------------

Thanks, Jay! 

I've posted information I have on forum.

> Synchronization mutex for clustered environments
> ------------------------------------------------
>
>                 Key: JBAS-5615
>                 URL: https://jira.jboss.org/jira/browse/JBAS-5615
>             Project: JBoss Application Server
>          Issue Type: Feature Request
>      Security Level: Public(Everyone can see) 
>    Affects Versions: JBossAS-4.2.2.GA
>            Reporter: Nick Belaevski
>            Assignee: Scott Marlow
>            Priority: Minor
>
> Quote from http://www.jboss.com/index.html?module=bb&op=viewtopic&t=136590 : "they'll need to be thread safe or have access to them synchronized".
> There's no object to synchronize against: SessionBasedClusteredSession doesn synchronization against itself:
>    public void writeExternal(ObjectOutput out) throws IOException
>    {
>       synchronized (this)
>       {
>          ...
>      }   
>    
>    } 
> but application developers see the wrapped one (instance of StandardSessionFacade), so synchronizing against session object does not prevent from concurrency errors

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