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From robert engels <reng...@ix.netcom.com>
Subject Re: TermInfosReader and clone of SegmentTermEnum
Date Wed, 13 Dec 2006 23:03:29 GMT
That is correct.

On Dec 13, 2006, at 4:48 PM, Otis Gospodnetic wrote:

> Aaaah, I think I get it.
> TermIndexReader can be shared by multiple threads.
> Each thread will need access to SegmentTermEnum inside the TIR, but  
> since each of them will search, scan, and seek to a different  
> location, each threads needs its own copy/clone of the original  
> SegmentTermEnum.
>
> ThreadLocal is then used as a simple cache for the clone of the  
> original SegmentTermEnum, so a single thread can get to it without  
> repeating scan/seek stuff, and so that each thread works with its  
> own clone of SegmentTermEnum.
>
> Otis
>
> ----- Original Message ----
> From: Otis Gospodnetic <otis_gospodnetic@yahoo.com>
> To: java-dev@lucene.apache.org
> Sent: Wednesday, December 13, 2006 4:53:45 PM
> Subject: TermInfosReader and clone of SegmentTermEnum
>
> Hi,
>
> I'm looking at Robert Engels' patches in http://issues.apache.org/ 
> jira/browse/LUCENE-436 and looking at TermInfosReader.
> I think I understand why there is ThreadLocal there in the first  
> place - to act as a per-thread cache for the expensive to compute  
> SegmentTermEnum.... yes?
>
> But why is there is need to clone() the (original) SegmentTermEnum?
>
> Thanks,
> Otis
>
>
>
>
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