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https://issues.apache.org/jira/browse/LUCENE-2345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12850075#action_12850075
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Shai Erera commented on LUCENE-2345:
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Earwin, w/o knowing too much about the details of your work, I wanted to
comment on "get rid of of init/reinit/moreinit methods, moving the code to
constructors". I work now on Parallel Index and one of the things I do is
extend IW. Currently, IW's ctor code performs the initialization, however I'm
thinking to move that code to an init method. The reason is to allow easy
extensions of IW, such as LUCENE-2330. There I'm going to add a default ctor to
IW, accompanied by an init method the extending class can call if needed. So
what I'm trying to say is that init methods are not always bad, and sometimes
ctors limit you. Perhaps it would make sense though in what you're trying to do
...
> 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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