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

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

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         spellIndexDirectory = null;
         SecurityHelper.doPriviledgedIOExceptionAction(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
            {
               dir = new File(baseDir, name);
            }
            return FSDirectory.getDirectory(dir, new NativeFSLockFactory(dir));
         }
      });
   }

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            if (!dir.mkdirs()) {
                if (!dir.isDirectory()) {
                    throw new IOException("Unable to create directory: '" + dir + "'");
                }
            }
            LockFactory lockFactory = new NativeFSLockFactory(dir);
            if (simpleFS) {
                directory = new SimpleFSDirectory(dir, lockFactory);
            } else {
                directory = 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" );
      }
      return new NativeFSLockFactory( indexDir );
    }
    else if ( "single".equals( lockFactoryName ) ) {
      return new SingleInstanceLockFactory();
    }
    else if ( "none".equals( lockFactoryName ) ) {

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    protected LockFactory buildLockFactory() throws IOException {
        String fsLock = componentSettings.get("fs_lock", "native");
        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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    @Override public SnapshotLock obtainSnapshotLock() throws Exception {
        if (!snapshotLock) {
            return NO_SNAPSHOT_LOCK;
        }
        AbstractFsBlobContainer fsBlobContainer = (AbstractFsBlobContainer) blobContainer;
        NativeFSLockFactory lockFactory = new NativeFSLockFactory(fsBlobContainer.filePath());


        Lock lock = lockFactory.makeLock("snapshot.lock");
        boolean obtained = lock.obtain();
        if (!obtained) {
            throw new ElasticSearchIllegalStateException("failed to obtain snapshot lock [" + lock + "]");
        }
        return new FsSnapshotLock(lock);

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            if (!dir.exists()) {
                FileSystemUtils.mkdirs(dir);
            }
            logger.trace("obtaining node lock on {} ...", dir.getAbsolutePath());
            try {
                NativeFSLockFactory lockFactory = new NativeFSLockFactory(dir);
                Lock tmpLock = lockFactory.makeLock("node.lock");
                boolean obtained = tmpLock.obtain();
                if (obtained) {
                    lock = tmpLock;
                    localNodeId = i;
                    break;

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         *            the associated query handler.
         */
        InternalSpellChecker(SearchIndex handler) throws IOException {
            this.handler = handler;
            String path = handler.getPath() + File.separatorChar + "spellchecker";
            this.spellIndexDirectory = FSDirectory.getDirectory(path, new NativeFSLockFactory(path));
            if (IndexReader.indexExists(spellIndexDirectory)) {
                this.lastRefresh = System.currentTimeMillis();
            }
            this.spellChecker = new JahiaExtendedSpellChecker(spellIndexDirectory);
            refreshSpellChecker();

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