Examples of org.apache.lucene.store.SimpleFSLockFactory

org.apache.lucene.store.SimpleFSLockFactory
sun.com/j2se/1.4.2/docs/api/java/io/File.html#createNewFile()">javadocs for File.createNewFile contain a vague yet spooky warning about not using the API for file locking. This warning was added due to this bug, and in fact the only known problem with using this API for locking is that the Lucene write lock may not be released when the JVM exits abnormally.

When this happens, a {@link LockObtainFailedException}is hit when trying to create a writer, in which case you need to explicitly clear the lock file first. You can either manually remove the file, or use the {@link org.apache.lucene.index.IndexWriter#unlock(Directory)}API. But, first be certain that no writer is in fact writing to the index otherwise you can easily corrupt your index.

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

  public void testWhetherDeleteAllDeletesWriteLock() throws Exception {
    Directory d = newFSDirectory(_TestUtil.getTempDir("TestIndexWriter.testWhetherDeleteAllDeletesWriteLock"));
    // Must use SimpleFSLockFactory... NativeFSLockFactory
    // somehow "knows" a lock is held against write.lock
    // even if you remove that file:
    d.setLockFactory(new SimpleFSLockFactory());
    RandomIndexWriter w1 = new RandomIndexWriter(random(), d);
    w1.deleteAll();
    try {
      new RandomIndexWriter(random(), d, newIndexWriterConfig(TEST_VERSION_CURRENT, null).setWriteLockTimeout(100));
      fail("should not be able to create another writer");

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

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

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

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

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

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  public void testWhetherDeleteAllDeletesWriteLock() throws Exception {
    Directory d = newFSDirectory(_TestUtil.getTempDir("TestIndexWriter.testWhetherDeleteAllDeletesWriteLock"));
    // Must use SimpleFSLockFactory... NativeFSLockFactory
    // somehow "knows" a lock is held against write.lock
    // even if you remove that file:
    d.setLockFactory(new SimpleFSLockFactory());
    RandomIndexWriter w1 = new RandomIndexWriter(random(), d);
    w1.deleteAll();
    try {
      new RandomIndexWriter(random(), d, newIndexWriterConfig(TEST_VERSION_CURRENT, null).setWriteLockTimeout(100));
      fail("should not be able to create another writer");

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    String lockFactoryName = dirConfiguration.getProperty( LOCKING_STRATEGY_PROP_NAME, defaultStrategy );
    if ( "simple".equals( lockFactoryName ) ) {
      if ( indexDir == null ) {
        throw new SearchException( "To use \"simple\" as a LockFactory strategy an indexBase path must be set" );
      }
      return new SimpleFSLockFactory( indexDir );
    }
    else if ( "native".equals( lockFactoryName ) ) {
      if ( indexDir == null ) {
        throw new SearchException( "To use \"native\" as a LockFactory strategy an indexBase path must be set" );
      }

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      File base = new File(core.getCoreDescriptor().getInstanceDir());
      snapDir = org.apache.solr.common.util.FileUtils.resolvePath(base, location).getAbsolutePath();
      File dir = new File(snapDir);
      if (!dir.exists())  dir.mkdirs();
    }
    lockFactory = new SimpleFSLockFactory(snapDir);
  }

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        LockFactory lockFactory = new NoLockFactory();
        if (fsLock.equals("native")) {
            // TODO LUCENE MONITOR: this is not needed in next Lucene version
            lockFactory = new NativeFSLockFactory();
        } else if (fsLock.equals("simple")) {
            lockFactory = new SimpleFSLockFactory();
        }
        return lockFactory;
    }

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