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From Yonik Seeley <yo...@lucidimagination.com>
Subject Re: MatchAllDocsQuery and MatchNoDocsQuery
Date Mon, 10 May 2010 14:18:49 GMT
Yes on all counts.  Lucene doesn't modify query objects, so they are
save for reuse among multiple threads.

-Yonik
Apache Lucene Eurocon 2010
18-21 May 2010 | Prague



2010/5/10 Mindaugas Žakšauskas <mindas@gmail.com>:
> Hi,
>
> Can anybody confirm whether MatchAllDocsQuery can be used as an
> immutable singletone? By this I mean creating a single instance and
> sharing it whenever I need to either use it on its own or in
> cojunction with other queries put into a BooleanQuery; to result all
> documents in a search result. Can the same instance even be reused
> among different threads?
>
> What would be the best way implementing MatchNoDocsQuery? My initial
> tests show that a new BooleanQuery() without any additional clauses
> would just do the job, but I just wanted to double check whether this
> is be a reliable assumption. Above questions also apply - could this
> be reused among different contexts, threads?
>
> Thanks in advance.
>
> Regards,
> Mindaugas
>
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