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https://issues.apache.org/jira/browse/LUCENE-3716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13190753#comment-13190753
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Michael McCandless commented on LUCENE-3716:
--------------------------------------------
+1
> Discussion topic: Move all Commit/Version&Reopen stuff from abstract IR to
> DirectoryReader
> ------------------------------------------------------------------------------------------
>
> Key: LUCENE-3716
> URL: https://issues.apache.org/jira/browse/LUCENE-3716
> Project: Lucene - Java
> Issue Type: Sub-task
> Affects Versions: 4.0
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: 4.0
>
>
> When implementing the parent issue, I noticed a lot of other stuff in
> IndexReader thats only implemented in DirectoryReader/SegmentReader and is
> not really related to IndexReader at all:
> - getVersion (maybe also isCurrent) only affects DirectoryReaders, because of
> the commit-stuff there is no easy way for e.g. MultiReader to implement this
> - reopen/openIfChanged cannot be implemented easily by most
> AtomicIndexReaders, but also CompositeIndexReader is the wrong place to
> define those methods
> - all methods returning/opening IndexCommits
> In the parant issue, I already let IndexReader.open() return DirectoryReader
> and I made this class public. We should move the whole stuff (including
> IR.open) to DirectoryReader. Reopening outside DirectoryReader is not really
> needed.
> If some people think, it should maybe stay abstract (affects only the
> reopen/version stuff), there are ways for other readers to implement it, but
> for sure its not specific to IR's in general. In that case I would decalre an
> interface that DirectoryReader implements. Code like SearcherManager/Solr
> could then instanceof the IR instance and find out if it's worth
> reopening/version checking).
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