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https://issues.apache.org/jira/browse/LUCENE-3089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13149580#comment-13149580
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Robert Muir commented on LUCENE-3089:
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I just don't think it should be blanket policy without thinking things thru.
for example: lots of code you see on the internet opens a new indexreader for
every search and closes it
should we seriously encourage this?! If someone seriously needs to do this,
thats an expert case and
they can use try + finally and close themselves.
So for example, there I think it makes sense for IndexReader to not support
AutoCLoseable, and separately
to remove the stupid IndexSearcher(Directory) so that IndexSearcher only takes
IndexReader, so its *always*
a thin wrapper like we claim it is (which is an outright lie today). Then
IndexSearcher would implement [Auto]Closeable
since its cheap.
> CachingTokenFilter can cause close() to be called twice.
> --------------------------------------------------------
>
> Key: LUCENE-3089
> URL: https://issues.apache.org/jira/browse/LUCENE-3089
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Robert Muir
>
> In LUCENE-3064, we added some state and checks to MockTokenizer to validate
> that consumers
> are properly using the tokenstream workflow (described here:
> http://lucene.apache.org/java/3_0_3/api/core/org/apache/lucene/analysis/TokenStream.html)
> One problem I noticed in
> TestTermVectorsWriter.testEndOffsetPositionWithCachingTokenFilter is that
> providing a CachingTOkenFilter directly will result
> in close() being called twice on the underlying tokenstream... this seems
> wrong.
> Some ideas to fix this could be:
> # CachingTokenFilter overrides close() and we document that you must close
> the underlying stream yourself. I think this is what the queryparser does
> anyway.
> # CachingTokenFilter does something tricky to ensure it only closes the
> underlying stream once.
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