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From "Michael Busch (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-743) IndexReader.reopen()
Date Thu, 18 Oct 2007 19:49:51 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12536028
] 

Michael Busch commented on LUCENE-743:
--------------------------------------

Hmm one other thing: how should IndexReader.close() work? If we re-open a reader (a is the
old reader, b is the new one), and then someone calls a.close(), then a should not close any
resources that it shares with b. 

One way to make this work would be reference counting. Since we want to avoid that, we could
simply restrict reopen() from being called twice for the same reader. Then there would never
be more than 2 readers sharing the same ressources. The old reader a would remember that reopen()
was called already and would not close the shared ressources on close(). However, the new
reader b would close all ressources, meaning that reader a would not work anymore after b.close()
was called. 
Thoughts?

> 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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