Examples of java.nio.channels.FileChannel.lock()

java.nio.channels.FileChannel.lock()
Obtain an exclusive lock on this file.
This is a convenience method for acquiring a maximum length lock on a file. It is equivalent to:
```
 fileChannel.lock(0L, Long.MAX_VALUE, false) 
```
@return the lock object representing the locked file area. @throws ClosedChannelException the file channel is closed. @throws NonWritableChannelException this channel was not opened for writing. @throws OverlappingFileLockException Either a lock is already held that overlaps this lock request, or another thread is waiting to acquire a lock that will overlap with this request. @throws FileLockInterruptionException The calling thread was interrupted while waiting to acquire the lock. @throws AsynchronousCloseException The channel was closed while the calling thread was waiting to acquire the lock. @throws IOException some other problem occured obtaining the requested lock.

                   so locking just from the current position would allow reading on systems where
                   locking is mandatory.  Also, Java 6 will throw an exception if the region of the
                   file is already locked by another FileChannel in the same JVM. Hopefully, that will
                   be avoided since every file should have a single file manager - unless two different
                   files strings are configured that somehow map to the same file.*/
                FileLock lock = channel.lock(0, Long.MAX_VALUE, false);
                try {
                    super.write(bytes, offset, length);
                } finally {
                    lock.release();
                }

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        fw.flush();
        fw.close();
      }
      FileChannel channel = new RandomAccessFile(pidFile, "rw").getChannel();
      LOGGER.info("Create PID-file=" + fileNameFull + " PID=" + pid);
      FileLock lock = channel.lock();
      return new FileCtx(lock, channel, pidFile);
    } finally {
      if (fw != null) {
        fw.close();
      }

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                    }
                }


                // get the lock using either try lock or not depending on if we are using timeout or not
                try {
                    lock = timeout > 0 ? channel.tryLock() : channel.lock();
                } catch (IllegalStateException ex) {
                    // Also catch the OverlappingFileLockException here. Do nothing here                    
                }
                if (lock != null) {
                    if (LOG.isTraceEnabled()) {

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            try
            {
                Properties props = new Properties();


                channel = new RandomAccessFile( touchfile, "rw" ).getChannel();
                lock = channel.lock( 0, channel.size(), false );


                if ( touchfile.canRead() )
                {
                    getLogger().debug( "Reading resolution-state from: " + touchfile );
                    ByteBuffer buffer = ByteBuffer.allocate( (int) channel.size() );

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                FileInputStream stream = new FileInputStream( touchfile );
                try
                {
                    channel = stream.getChannel();
                    lock = channel.lock( 0, channel.size(), true );


                    getLogger().debug( "Reading resolution-state from: " + touchfile );
                    props.load( stream );


                    return props;

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                    }
                }


                // get the lock using either try lock or not depending on if we are using timeout or not
                try {
                    lock = timeout > 0 ? channel.tryLock() : channel.lock();
                } catch (IllegalStateException ex) {
                    // Also catch the OverlappingFileLockException here. Do nothing here                    
                }
                if (lock != null) {
                    LOG.trace("Acquired exclusive read lock: {} to file: {}", lock, target);

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            FileLock lock = null;
            try {
                FileInputStream istream = new FileInputStream(file);
                in = new BufferedInputStream(istream);
                FileChannel channel = istream.getChannel();
                lock = channel.lock(0L, Long.MAX_VALUE, true);
                Document doc = builder.parse(in);
                NodeList entries = XPathAPI.selectNodeList(doc
                        .getDocumentElement(), "entry"); //$NON-NLS-1$
                int length = entries.getLength();
                for (int i = 0; i < length; i++) {

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        FileLock lock = null;
        try {
            FileOutputStream ostream = new FileOutputStream(file);
            out = new BufferedWriter(new OutputStreamWriter(ostream, "UTF-8")); //$NON-NLS-1$
            FileChannel channel = ostream.getChannel();
            lock = channel.lock();
            out.write(HEADER);
            out.newLine();
            out.write(FILE_PREFS);
            out.newLine();
            if (prefs.size() == 0) {

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            try {


                FileInputStream istream = new FileInputStream(file);
                in = new BufferedInputStream(istream);
                FileChannel channel = istream.getChannel();
                lock = channel.lock(0L, Long.MAX_VALUE, true);
                Document doc = builder.parse(in);
                NodeList entries = XPathAPI.selectNodeList(doc
                        .getDocumentElement(), "entry"); //$NON-NLS-1$
                int length = entries.getLength();
                for (int i = 0; i < length; i++) {

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        FileLock lock = null;
        try {
            FileOutputStream ostream = new FileOutputStream(file);
            out = new BufferedWriter(new OutputStreamWriter(ostream, "UTF-8")); //$NON-NLS-1$
            FileChannel channel = ostream.getChannel();
            lock = channel.lock();
            out.write(HEADER);
            out.newLine();
            out.write(FILE_PREFS);
            out.newLine();
            if (prefs.size() == 0) {

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