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Date: Thu, 16 Mar 2006 17:48:13 +0000 (GMT)
From: "Tatu Saloranta (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-520) Ability to abort hit collection
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    [ http://issues.apache.org/jira/browse/LUCENE-520?page=comments#action_12370726 ] 

Tatu Saloranta commented on LUCENE-520:
---------------------------------------

Quick note regarding exceptions: an easy way to remove most of runtime exception overhead is to just construct a shared exception object in advance, and keep throwing that. Stack information will obviously be irrelevant (and refer to the place where it was constructed), but since creating stack frame objects is the expensive part, reusing that exception results in very fast operation. Obviously it's not a very clean way to do it, so should only be done by application code, and developers need to understand that it's a token exception only used for signalling.
For this reason, one should in general create a new exception class, too, to be to catch just those instances (but no other runtime exceptions).


> Ability to abort hit collection
> -------------------------------
>
>          Key: LUCENE-520
>          URL: http://issues.apache.org/jira/browse/LUCENE-520
>      Project: Lucene - Java
>         Type: Improvement
>   Components: Search
>     Versions: 1.9
>     Reporter: Eric Jain
>     Priority: Minor

>
> If the HitCollector.collect method returned a boolean value rather than void, this value could be used to determine whether any further hits should be reported. This would speed up things a bit when all you need is a confirmation that a query produces some hits (e.g. for generating suggestions).

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