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.

                case LOCK_EX:
                    if (currentLock != null) {
                        currentLock.release();
                        currentLock = null;
                    }
                    currentLock = fileChannel.lock();
                    if (currentLock != null) {
                        return RubyFixnum.zero(context.getRuntime());
                    }


                    break;

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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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    byte[] data = compose();
    if (!f.exists()) {
      f.createNewFile();
    }
    FileChannel fc = new FileOutputStream(f).getChannel();
    FileLock fl = fc.lock();
    try {
      fc.write(ByteBuffer.wrap(data));
    } finally {
      fl.release();
      fc.close();

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            if (LOG.isDebugEnabled()) {
                LOG.debug("Locking the file: " + file + " using the lock file name: " + lockFileName);
            }


            FileChannel channel = new RandomAccessFile(lockFileName, "rw").getChannel();
            FileLock lock = channel.lock();
            if (lock != null) {
                exchange.setProperty("org.apache.camel.fileChannel", channel);
                exchange.setProperty("org.apache.camel.file.lock", lock);
                exchange.setProperty("org.apache.camel.file.lock.name", lockFileName);
                return true;

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    private synchronized void writeToFile(String action) {
        Date date = new Date();
        try {
            FileOutputStream out = new FileOutputStream(logFile, true);
            FileChannel channel = out.getChannel();
            FileLock lock = channel.lock(0, Long.MAX_VALUE, false);
            PrintWriter writer = new PrintWriter(out, false);
            writer.println(DATE_FORMAT.format(date)+" - "+action+" - "+username);
            writer.flush();
            writer.close();
            if(lock.isValid()) {

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                   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.*/
                final FileLock lock = channel.lock(0, Long.MAX_VALUE, false);
                try {
                    super.write(bytes, offset, length);
                } finally {
                    lock.release();
                }

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    private synchronized void writeToFile(String action) {
        Date date = new Date();
        try {
            FileOutputStream out = new FileOutputStream(logFile, true);
            FileChannel channel = out.getChannel();
            FileLock lock = channel.lock(0, Long.MAX_VALUE, false);
            PrintWriter writer = new PrintWriter(out, false);
            writer.println(DATE_FORMAT.format(date)+" - "+action+" - "+username);
            writer.flush();
            writer.close();
            if(lock.isValid()) {

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        }


        // try to acquire rw lock on the file before we can consume it
        FileChannel channel = new RandomAccessFile(file, "rw").getChannel();
        try {
            FileLock lock = channel.lock();
            if (LOG.isTraceEnabled()) {
                LOG.trace("Acquired exclusive read lock: " + lock + " to file: " + file);
            }
            // just release it now we dont want to hold it during the rest of the processing
            lock.release();

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        f.createNewFile();
        RandomAccessFile raf = new java.io.RandomAccessFile(fileName, "r");
        FileChannel fcr = raf.getChannel();


        try {
            fcr.lock(0L, Long.MAX_VALUE, false);
            fail("NonWritableChannelException expected!");
        } catch (NonWritableChannelException e) {}
        raf.close();
    }

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            if (LOG.isDebugEnabled()) {
                LOG.debug("Locking the file: " + file + " using the lock file name: " + lockFileName);
            }


            FileChannel channel = new RandomAccessFile(lockFileName, "rw").getChannel();
            FileLock lock = channel.lock();
            if (lock != null) {
                exchange.setProperty("org.apache.camel.file.lock", lock);
                exchange.setProperty("org.apache.camel.file.lock.name", lockFileName);
                return true;
            } else {

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