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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-743) IndexReader.reopen()
Date Thu, 18 Oct 2007 20:04:51 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12536033
] 

Michael McCandless commented on LUCENE-743:
-------------------------------------------

I think reference counting would solve this issue quite nicely.  How come we want to avoid
reference counting?  It seems like the right solution here.

The implementation seems simple.  When a reader is opened, it starts with RC 1.  When it is
closed, it decrefs the RC and marks itself closed (to make sure double-close does not re-decref
the RC).  When a MultiReader needs to use the reader, it calls incref.  And when that MultiReader
is done with it, it calls decref.  Whenever the RC hits 0 it's safe to free all resources.

Wouldn't that work?

> IndexReader.reopen()
> --------------------
>
>                 Key: LUCENE-743
>                 URL: https://issues.apache.org/jira/browse/LUCENE-743
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Otis Gospodnetic
>            Assignee: Michael Busch
>            Priority: Minor
>             Fix For: 2.3
>
>         Attachments: IndexReaderUtils.java, lucene-743-take2.patch, lucene-743.patch,
lucene-743.patch, lucene-743.patch, MyMultiReader.java, MySegmentReader.java, varient-no-isCloneSupported.BROKEN.patch
>
>
> This is Robert Engels' implementation of IndexReader.reopen() functionality, as a set
of 3 new classes (this was easier for him to implement, but should probably be folded into
the core, if this looks good).

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