Examples of org.apache.lucene.store.NativeFSLockFactory

org.apache.lucene.store.NativeFSLockFactory

Implements {@link LockFactory} using native OS filelocks. Note that because this LockFactory relies on java.nio.* APIs for locking, any problems with those APIs will cause locking to fail. Specifically, on certain NFS environments the java.nio.* locks will fail (the lock can incorrectly be double acquired) whereas {@link SimpleFSLockFactory} worked perfectly in those sameenvironments. For NFS based access to an index, it's recommended that you try {@link SimpleFSLockFactory}first and work around the one limitation that a lock file could be left when the JVM exits abnormally.

The primary benefit of {@link NativeFSLockFactory} isthat lock files will be properly removed (by the OS) if the JVM has an abnormal exit.

Note that, unlike {@link SimpleFSLockFactory}, the existence of leftover lock files in the filesystem on exiting the JVM is fine because the OS will free the locks held against these files even though the files still remain.

If you suspect that this or any other LockFactory is not working properly in your environment, you can easily test it by using {@link VerifyingLockFactory}, {@link LockVerifyServer} and {@link LockStressTest}.
@see LockFactory

    private static final int            MAX_RESULTS = 5000; // does this need to be configurable?


    public LogSearch(File file) throws Exception
    {
        this.file = file;
        directory = new NIOFSDirectory(file, new NativeFSLockFactory());
        reader = IndexReader.open(directory);
        searcher = new IndexSearcher(reader);
    }

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                if (!dir.exists()) {
                    FileSystemUtils.mkdirs(dir);
                }
                logger.trace("obtaining node lock on {} ...", dir.getAbsolutePath());
                try {
                    NativeFSLockFactory lockFactory = new NativeFSLockFactory(dir.toPath());
                    Lock tmpLock = lockFactory.makeLock("node.lock");
                    boolean obtained = tmpLock.obtain();
                    if (obtained) {
                        locks[dirIndex] = tmpLock;
                        nodesFiles[dirIndex] = dir;
                        localNodeId = possibleLockId;

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    else if ( "native".equals( lockFactoryName ) ) {
      if ( indexDir==null ) {
        throw new SearchException( "To use \"native\" as a LockFactory strategy an indexBase path must be set");
      }
      try {
        return new NativeFSLockFactory( indexDir );
      } catch (IOException e) {
        throw new SearchException( "Could not initialize NativeFSLockFactory", e);
      }
    }
    else if ( "single".equals( lockFactoryName ) ) {

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    }
    else if ( "native".equals( lockFactoryName ) ) {
      if ( indexDir == null ) {
        throw new SearchException( "To use \"native\" as a LockFactory strategy an indexBase path must be set" );
      }
      return new NativeFSLockFactory( indexDir );
    }
    else if ( "single".equals( lockFactoryName ) ) {
      return new SingleInstanceLockFactory();
    }
    else if ( "none".equals( lockFactoryName ) ) {

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