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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