Make it possible to subclass SegmentReader
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                 Key: LUCENE-2345
                 URL: https://issues.apache.org/jira/browse/LUCENE-2345
             Project: Lucene - Java
          Issue Type: Wish
          Components: Index
            Reporter: Tim Smith
             Fix For: 3.1


I would like the ability to subclass SegmentReader for numerous reasons:
* to capture initialization/close events
* attach custom objects to an instance of a segment reader (caches, statistics, 
so on and so forth)
* override methods on segment reader as needed

currently this isn't really possible

I propose adding a SegmentReaderFactory that would allow creating custom 
subclasses of SegmentReader

default implementation would be something like:
{code}
public class SegmentReaderFactory {
  public SegmentReader get(boolean readOnly) {
    return readOnly ? new ReadOnlySegmentReader() : new SegmentReader();
  }

  public SegmentReader reopen(SegmentReader reader, boolean readOnly) {
    return newSegmentReader(readOnly);
  }
}
{code}

It would then be made possible to pass a SegmentReaderFactory to IndexWriter 
(for pooled readers) as well as to SegmentReader.get() (DirectoryReader.open, 
etc)

I could prepare a patch if others think this has merit

Obviously, this API would be "experimental/advanced/will change in future"




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