Allow easy extension of IndexWriter
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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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