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https://issues.apache.org/jira/browse/VFS-156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12495758
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Adam Heath commented on VFS-156:
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Well, how can the user detect whether a listener is already added? Such a
method does not exist in FileSystem. Then, you have the problem of
synchronization and locking.
It's not a new dependency; see LRUFilesCache. It uses commons-collections
already.
If my patch had required a new dependency, I would have said so.
> Use a set to hold the listeners in AbstractFileSystem
> -----------------------------------------------------
>
> Key: VFS-156
> URL: https://issues.apache.org/jira/browse/VFS-156
> Project: Commons VFS
> Issue Type: Improvement
> Affects Versions: 1.1
> Reporter: Adam Heath
> Priority: Minor
> Attachments: feature_ListOrderedSet-listeners.patch
>
>
> Use a set(from commons-collections) to hold the listeners, so that a listener
> isn't added multiple times.
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