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https://issues.apache.org/jira/browse/LUCENE-2345?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Smith updated LUCENE-2345:
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Attachment: LUCENE-2345_3.0.plugins.patch
Here's a patch (again, against 3.0) showing the minimal API i would like to see
from the plugin model
> 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, LUCENE-2345_3.0.plugins.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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