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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2330) Allow easy extension of IndexWriter
Date Thu, 18 Mar 2010 13:25:27 GMT
Allow easy extension of IndexWriter
-----------------------------------

                 Key: LUCENE-2330
                 URL: https://issues.apache.org/jira/browse/LUCENE-2330
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Index
            Reporter: Shai Erera
             Fix For: 3.1


IndexWriter is not so easy to extend. It hides a lot of useful methods from extending classes
as well as useful members (like infoStream). Most of this stuff is very straightforward and
I believe it's not exposed for no particular reason. Over in LUCENE-1879 I plan extend IndexWriter
to provide a ParallelWriter which will support the parallel indexing requirements. For that
I'll need access to several methods and members. I plan to contain in this issue some simple
hooks, nothing fancy (and hopefully controversial). I'll leave the rest to specific issues.
For now:
# Introduce a protected default constructor and init(Directory, IndexWriterConfig). That's
required because ParallelWriter does not itself index anything, but instead delegates to its
Slices. So that ctor is for convenience only, and I'll make it clear (through javadocs) that
if one uses it, one needs to call init(). PQ has the same pattern.
# Expose some members and methods that are useful for extensions (such as config, infoStream
etc.). Some candidates are package-private methods, but these will be reviewed and converted
on a case by case basis.

I don't plan to do anything drastic here, just prepare IW for easier extendability.

I'll post a patch after LUCENE-2320 is committed.

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