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From "Karl Wettin (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-671) Hashtable based Document
Date Thu, 14 Sep 2006 20:00:26 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-671?page=comments#action_12434791 ] 
            
Karl Wettin commented on LUCENE-671:
------------------------------------


Cutting:
> To make Documents fully-subclassible one would need to make their serialization extensible.

I find this a bit strange considering RAMDirectory was not made serializable until a few months
ago.. But then it might just have been something preemptive. Or perhaps people serialize documents
without adding them to the index? That too sounds quite fishy.

I'm all for definalizing Term and Document as this is something required for my issue 550
index.

> Hashtable based Document
> ------------------------
>
>                 Key: LUCENE-671
>                 URL: http://issues.apache.org/jira/browse/LUCENE-671
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index, Search
>    Affects Versions: 2.0.0, 1.9
>            Reporter: Chris
>            Priority: Minor
>         Attachments: HashDocument.java, TestBenchDocuments.java
>
>
> I've attached a Document based on a hashtable and a performance test case. It performs
better in most cases (all but enumeration by my measurement), but likely uses a larger memory
footprint. The Document testcase will fail since it accesses the "fields" variable directly
and gets confused when it's not the list it expected it to be. 
> If nothing else we would be interested in at least being able to extend Document, which
is currently declared final. (Anyone know the performance gains on declaring a class final?)
Currently we have to maintain a copy of lucene which has methods and classes definalized and
overriden. 
> There are other classes as well that could be declared non-final (Fieldable comes to
mind) since it's possible to make changes for project specific situations in those aswell
but that's off-topic.

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