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https://issues.apache.org/jira/browse/VFS-324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12927375#action_12927375
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Sebb commented on VFS-324:
--------------------------

Fix looks OK, but I agree that the code is not thread-safe under all calling 
sequences. But at least the class data will be consistent across threads.

The parent classes aren't thread-safe either, and have data publication 
problems.

> RamFileSystem.close() should clear the cache rather than nulling it
> -------------------------------------------------------------------
>
>                 Key: VFS-324
>                 URL: https://issues.apache.org/jira/browse/VFS-324
>             Project: Commons VFS
>          Issue Type: Bug
>            Reporter: Sebb
>             Fix For: 2.0
>
>
> RamFileSystem.close() should probably clear the cache rather than nulling it.
> This would allow the field to be made final, as well as avoiding an NPE if 
> any methods using the cache are invoked after close.
> Making the field final would ensure it was published correctly - at present 
> the class is not thread-safe

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