Multi-threading issues
----------------------

                 Key: VFS-326
                 URL: https://issues.apache.org/jira/browse/VFS-326
             Project: Commons VFS
          Issue Type: Bug
            Reporter: Sebb
            Assignee: Sebb


SoftRefFilesCache and DefaultFileMonitor use a boolean to communicate between 
threads, but don't use synchronisation.
There is no guarantee that the updated value of the boolean will be seen by the 
other thread. Adding volatile would fix this.

There are also various private instance fields that are not modified after 
construction.
If these were made final, it would improve thread-safety because the fields 
would then be published correctly across threads.

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