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https://issues.apache.org/jira/browse/LUCENE-4370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13997666#comment-13997666
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Shikhar Bhushan commented on LUCENE-4370:
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> On one hand I think a Collector.finish() would be nice, but the argument
> could be made you could handle this yourself (its done with
> IndexSearcher.search returns).
Such a technique does not compose easily e.g. when you want to wrap collectors
in other collectors, unless you customize each and every one in the chain.
> Let Collector know when all docs have been collected
> ----------------------------------------------------
>
> Key: LUCENE-4370
> URL: https://issues.apache.org/jira/browse/LUCENE-4370
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Affects Versions: 4.0-BETA
> Reporter: Tomás Fernández Löbbe
> Priority: Minor
> Attachments: LUCENE-4370.patch, LUCENE-4370.patch
>
>
> Collectors are a good point for extension/customization of Lucene/Solr,
> however sometimes it's necessary to know when the last document has been
> collected (for example, for flushing cached data).
> It would be nice to have a method that gets called after the last doc has
> been collected.
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