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https://issues.apache.org/jira/browse/LUCENE-2345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12850094#action_12850094
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Shai Erera commented on LUCENE-2345:
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Earwin, I wholeheartedly agree with what you wrote. If we could refactor IW and
extract it to a set of interfaces, then I agree (and Michael B. has an issue
open for that). I think though that IW's API is already that interface (give or
take few methods). So perhaps this can be an easy refactoring - introduce an
Indexer (a la Searcher) class (or interface) w/ all of IW public methods, and
then let PW extend/impl that class/interface as well as IW. We can also
consider making IW itself final this way (though bw police will prevent it :)).
Then when PW sets up the slices, it can create them as IW or any other IW-like
implementation it needs them to impl. If it sounds good enough to become its
own issue, I can open one and we can continue discussing it there (and leave
that issue focused on extending SR). Then I'll hold off w/ LUCENE-2330, or
simply rename it to reflect that Indexer API.
> Make it possible to subclass SegmentReader
> ------------------------------------------
>
> 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
>
> Attachments: LUCENE-2345_3.0.patch
>
>
> 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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