IndexWriter q

[Maxim Khesin]

Hi all,
I have seen the following usage in IndexWriter:
synchronized (directory) {              // in- & inter-process sync
    new Lock.With(directory.makeLock(IndexWriter.COMMIT_LOCK_NAME), 
COMMIT_LOCK_TIMEOUT) {
        public Object doBody() throws IOException {
          segmentInfos.write(directory);      // commit before deleting
          deleteSegments(segmentsToDelete);      // delete now-unused 
segments
          return null;
        }
      }.run();
  }

my question is:
It seems that the synchronized (directory) code is redundant, since 
there is already a file-based lock there. Is there a special case that 
synchronized(directory) handles?

thanks,
max.


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