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Posted to dev@commons.apache.org by "Mario Ivankovits (JIRA)" <ji...@apache.org> on 2006/05/25 21:51:30 UTC
[jira] Resolved: (VFS-50) Threading issue with
AbstractFileSystem.fireEvent
[ http://issues.apache.org/jira/browse/VFS-50?page=all ]
Mario Ivankovits resolved VFS-50:
---------------------------------
Fix Version: Nightly Builds
Resolution: Fixed
Assign To: Mario Ivankovits
Well, this wasnt really a "threading issue" but a normal bug.
Since every access to the "listeners" is synchronized on the "listenerMap" both are save. There is no access to the "listeners" outside an "listenerMap" synchronization.
I slightly modified your patch.
Thanks for reporting it.
> Threading issue with AbstractFileSystem.fireEvent
> -------------------------------------------------
>
> Key: VFS-50
> URL: http://issues.apache.org/jira/browse/VFS-50
> Project: Commons VFS
> Type: Bug
> Reporter: Chris DiGiano
> Assignee: Mario Ivankovits
> Priority: Minor
> Fix For: Nightly Builds
>
> I make heavy use of DelegateFileObject in my code and recently ran into a threading issue when a change in one file was trying to automatically update dependent DelegateFileObjects. While events where still being propagated, one DelegateFileObject removed itself as an event listener. This caused an index-of-range problem in AbstractFileSystem.fireEvent because the listener list had shrunk, but the "count" had already been fixed.
> It appears that the current implementation of fireEvent is not entirely thread safe, if event handlers can still change the listener list in place. I will attach a patch that works for me.
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