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

   */
  public synchronized void startup() throws PersistenceException {
    try {
      if (fDirectory == null) {
        String path = Activator.getDefault().getStateLocation().toOSString();
        LockFactory lockFactory = new NativeFSLockFactory(path);
        fDirectory = FSDirectory.getDirectory(path, lockFactory);
      }


      if (fIndexer == null)
        fIndexer = new Indexer(this, fDirectory);

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   */
  public void startup() throws PersistenceException {
    try {
      if (fDirectory == null) {
        String path = Activator.getDefault().getStateLocation().toOSString();
        LockFactory lockFactory = new NativeFSLockFactory(path);
        fDirectory = FSDirectory.getDirectory(path, lockFactory);
      }


      if (fIndexer == null)
        fIndexer = new Indexer(this, fDirectory);

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      new Function() {
        public void run() throws Exception {
          String LOCK_FILE = "write.lock";
          String dicHome = p
              .getProperty("paoding.dic.home.absolute.path");
          FSLockFactory FileLockFactory = new NativeFSLockFactory(
              dicHome);
          Lock lock = FileLockFactory.makeLock(LOCK_FILE);


          boolean obtained = false;
          try {
            obtained = lock.obtain(90000);
            if (obtained) {

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               }
            }
            // if both not defined, using FSDirectory.open
            if (FS_DIRECTORY_CLASS == null && LOCK_FACTORY_CLASS == null)
            {
               return FSDirectory.open(dir, new NativeFSLockFactory(dir));
            }
            // LOCK FACTORY only defined, using deprecated getDirectory method
            else
            {
               return FSDirectory.getDirectory(dir, LOCK_FACTORY_CLASS != null ? null : new NativeFSLockFactory(dir));
            }
         }
      });
   }

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

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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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    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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    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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       */
      InternalSpellChecker(SearchIndex handler, float minDistance, boolean morePopular) throws IOException
      {
         this.handler = handler;
         String path = handler.getContext().getIndexDirectory() + File.separatorChar + "spellchecker";
         this.spellIndexDirectory = FSDirectory.getDirectory(path, new NativeFSLockFactory(path));
         if (IndexReader.indexExists(spellIndexDirectory))
         {
            this.lastRefresh = System.currentTimeMillis();
         }
         this.spellChecker = new SpellChecker(spellIndexDirectory);

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