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

   * @return the directory
   * @throws IOException if an I/O exception occurs
   */
  protected Directory getDirectory() throws IOException {
    File fDir = new File(this.getIndexReference().getIndexLocation());
    NativeFSLockFactory nativeLockFactory = this.getNativeLockFactory();
    if (nativeLockFactory != null) {
      return FSDirectory.open(fDir,nativeLockFactory);
    } else {
      return FSDirectory.open(fDir);
    }

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   * Gets the native lock factory if it has been configured for use.
   * @return the native lock factory (null if not configured for use)
   * @throws IOException if an I/O exception occurs
   */
  protected synchronized NativeFSLockFactory getNativeLockFactory() throws IOException {
    NativeFSLockFactory factory = null;
    if (this.getIndexReference().getUseNativeFSLockFactory()) {
      File dir = new File(this.getIndexReference().getIndexLocation());
      String path = dir.getCanonicalPath();
      synchronized (NATIVEFSLOCKFACTORIES) {
        factory = NATIVEFSLOCKFACTORIES.get(path);
        if (factory == null) {
          factory = new NativeFSLockFactory(dir);
          NATIVEFSLOCKFACTORIES.put(path,factory);
        } 
      }
    } 
    return factory;

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   * Gets the native lock factory if it has been configured for use.
   * @return the native lock factory (null if not configured for use)
   * @throws IOException if an exception occurs
   */
  private synchronized NativeFSLockFactory getNativeLockFactory() throws IOException {
    NativeFSLockFactory factory = null;
    if (this.luceneConfig.getUseNativeFSLockFactory()) {
      File dir = new File(this.luceneConfig.getIndexLocation());
      String path = dir.getCanonicalPath();
      synchronized (NATIVEFSLOCKFACTORIES) {
        factory = NATIVEFSLOCKFACTORIES.get(path);
        if (factory == null) {
          factory = new NativeFSLockFactory(dir);
          NATIVEFSLOCKFACTORIES.put(path,factory);
        } 
      }
      //if (NATIVEFSLOCKFACTORY == null) {
      //  File lDir = new File(this.luceneConfig.getIndexLocation());

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   * @return the directory
   * @throws IOException if an exception occurs
   */
  private Directory newDirectory() throws IOException {
    File fDir = new File(this.luceneConfig.getIndexLocation());
    NativeFSLockFactory nativeLockFactory = this.getNativeLockFactory();
    if (nativeLockFactory != null) {
      return FSDirectory.open(fDir,nativeLockFactory);
    } else {
      return FSDirectory.open(fDir);
    }

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  public synchronized Lock obtainBackgroundLock() throws LockObtainFailedException {
    Lock lock = null;
    String pfx = "Unable to obtain background lock.";
    if (this.luceneConfig.getUseNativeFSLockFactory()) {
      try {
        NativeFSLockFactory nativeLockFactory = this.getNativeLockFactory();
        lock = nativeLockFactory.makeLock(BACKGROUND_LOCKNAME);
      } catch (IOException e) {
        String msg = pfx+" "+e.getMessage();
        getLogger().log(Level.WARNING,pfx,e);
        throw new LockObtainFailedException(msg);
      }

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            }
            else
            {
               dir = new File(baseDir, name);
            }
            return FSDirectory.getDirectory(dir, new NativeFSLockFactory(dir));
         }
      });
   }

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         spellIndexDirectory = null;
         SecurityHelper.doPrivilegedIOExceptionAction(new PrivilegedExceptionAction<Object>()
         {
            public Object run() throws Exception
            {
               spellIndexDirectory = FSDirectory.getDirectory(path, new NativeFSLockFactory(path));
               if (IndexReader.indexExists(spellIndexDirectory))
               {
                  lastRefresh = System.currentTimeMillis();
               }
               return null;

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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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               {
                  throw new IOException("Cannot create directory: " + dir);
               }
            }
            LockFactory lockFactory =
               (LOCK_FACTORY_CLASS == null) ? new NativeFSLockFactory() : (LockFactory)LOCK_FACTORY_CLASS.newInstance();


            if (FS_DIRECTORY_CLASS == null)
            {
               return FSDirectory.open(dir, lockFactory);
            }

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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 );
      }
    }

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