[jboss-jira] [JBoss JIRA] Closed: (JBAOP-629) Synchronize addBinding and removeBinding to avoid duplicate operations

Tue Sep 30 01:24:21 EDT 2008

     [ https://jira.jboss.org/jira/browse/JBAOP-629?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Flavia Rainone closed JBAOP-629.
--------------------------------

    Resolution: Done


> Synchronize addBinding and removeBinding to avoid duplicate operations
> ----------------------------------------------------------------------
>
>                 Key: JBAOP-629
>                 URL: https://jira.jboss.org/jira/browse/JBAOP-629
>             Project: JBoss AOP
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 2.0.0.CR16
>            Reporter: Flavia Rainone
>            Assignee: Flavia Rainone
>             Fix For: 2.0.0.GA
>
>
> As the addBinding method is synchronized, it is possible that a binding is added to the binding list and the thread performing this operation is preempted by another thread that is performing a removal operation.
> In this case, the removal operation performed by this second thread could use the newly added binding in the chains it is rebuilding. When the first thread resumes, it will rebuild the chains for the added binding, adding interceptors to all affected chains, ignoring the fact that those chains may already contain those interceptors, because of the chain rebuild process performed by the second thread.
> In this scenario, we will end up with chains containing duplicate interceptors.
> Notice that synchronizing the add and remove methods is not an option, as those methods being synchronized causes a deadlock (see JBAOP-501).

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