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From "Shai Erera (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-3761) Generalize SearcherManager
Date Wed, 08 Feb 2012 16:50:59 GMT
Generalize SearcherManager
--------------------------

                 Key: LUCENE-3761
                 URL: https://issues.apache.org/jira/browse/LUCENE-3761
             Project: Lucene - Java
          Issue Type: Improvement
          Components: core/search
            Reporter: Shai Erera
            Assignee: Shai Erera
            Priority: Minor
             Fix For: 3.6, 4.0


I'd like to generalize SearcherManager to a class which can manage instances of a certain
type of interfaces. The reason is that today SearcherManager knows how to handle IndexSearcher
instances. I have a SearcherManager which manages a pair of IndexSearcher and TaxonomyReader
pair.

Recently, few concurrency bugs were fixed in SearcherManager, and I realized that I need to
apply them to my version as well. Which led me to think why can't we have an SM version which
is generic enough so that both my version and Lucene's can benefit from?

The way I see SearcherManager, it can be divided into two parts: (1) the part that manages
the logic of acquire/release/maybeReopen (i.e., ensureOpen, protect from concurrency stuff
etc.), and (2) the part which handles IndexSearcher, or my SearcherTaxoPair. I'm thinking
that if we'll have an interface with incRef/decRef/tryIncRef/maybeRefresh, we can make SearcherManager
a generic class which handles this interface.

I will post a patch with the initial idea, and we can continue from there.

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