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https://issues.apache.org/jira/browse/LUCENE-5204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13764908#comment-13764908
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Robert Muir commented on LUCENE-5204:
-------------------------------------
Can we make FilterDirectory package-private?
I know we have done this FilterXXX strategy with other apis, but delegating
over an abstract class is always broken by definition... Its a little scary to
expose this as a "supported API" for directory.
> Make Directory easier to wrap
> -----------------------------
>
> Key: LUCENE-5204
> URL: https://issues.apache.org/jira/browse/LUCENE-5204
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-5204.patch
>
>
> We have a few DirectoryWrapper implementations such as
> RateLimitedDirectoryWrapper and MockDirectoryWrapper. However, the Directory
> class is not straightforward to wrap since it already has logic for getting
> and setting the lock factory, so wrappers need to decide whether they should
> forward lock handling to the delegate or handle it themselves.
> I would like to move the locking logic out of the Directory class and to have
> a base {{FilterDirectory}} that could be extended by other directory wrapper
> impls.
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