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From Mindaugas Žakšauskas (JIRA) <j...@apache.org>
Subject [jira] Created: (LUCENE-1203) [PATCH] Allow setting IndexReader to IndexSearcher
Date Thu, 06 Mar 2008 10:50:57 GMT
[PATCH] Allow setting IndexReader to IndexSearcher
--------------------------------------------------

                 Key: LUCENE-1203
                 URL: https://issues.apache.org/jira/browse/LUCENE-1203
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Search
    Affects Versions: 2.3.1
         Environment: Linux/2.6
            Reporter: Mindaugas Žakšauskas
         Attachments: IndexReaderSetter4IndexSearcher.patch

As I've received no counter-arguments for my Lucene Java-User mailing list (see http://mail-archives.apache.org/mod_mbox/lucene-java-user/200803.mbox/%3Ca4d7dcf50803050918h68defe83v66e657debb76d3f3@mail.gmail.com%3E),
I would like to propose adding a setter to set new instance of IndexReader to IndexSearcher.


Why is this needed?

The FAQ (http://wiki.apache.org/lucene-java/LuceneFAQ#head-48921635adf2c968f7936dc07d51dfb40d638b82)
says:
bq. ??"Make sure you only open one IndexSearcher, and share it among all of the threads that
are doing searches -- this is safe, and it will minimize the number of files that are open
concurently."??
So does the JavaDoc (http://lucene.apache.org/java/2_3_1/api/core/org/apache/lucene/search/IndexSearcher.html).

In my application, I don't want to expose anything about IndexReader; all they need to know
is Searcher - see my post to the mailing list how would I do this. However, if the index is
updated, reopened reader cannot be set back to IndexSearcher, a new instance of IndexSearcher
needs to be created (*which contradicts FAQ and Javadoc*).

At the moment, the only way to go around this is to create a surrogate subclass of IndexSearcher
and set new instance of IndexReader. A simple setter would just do the job.


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