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https://issues.apache.org/jira/browse/LUCENE-3788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13208355#comment-13208355
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Uwe Schindler commented on LUCENE-3788:
---------------------------------------
Additionally, DirectoryReader is exactly the abstraction you are requesting.
Solr also needs commits, versions,.. - all from DirectoryReader. So your magic
ParallelDirectoryReader sould simply subclass DirectoryReader (which, again, is
abstract): Example code is here:
{code:java}
public class MagicDirectoryReader extends DirectoyReader {
public MagicDirectoryReader(Directory dir, ParallelCompositeReader parallel) {
super(dir, [Some casts/copying maybe needed]
parallel.getSequentialSubReaders());
}
// override the rest of abstract methods to fake the commit-stuff for solr
}
{code}
> Separate getting Directory from IndexReader from its concrete subclasses
> ------------------------------------------------------------------------
>
> Key: LUCENE-3788
> URL: https://issues.apache.org/jira/browse/LUCENE-3788
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/index
> Reporter: Andrzej Bialecki
> Attachments: LUCENE-3788.patch
>
>
> Currently only subclasses of DirectoryReader expose the underlying Directory
> via public final directory(). IMHO this aspect should be separated from
> DirectoryReader so that other IndexReader implementations could expose any
> underlying Directory if they wanted to. Specifically, I have a use case where
> I'd like to expose a synthetic Directory view of resources used for
> ParallelCompositeReader.
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