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.

        FileChannel channel = null;
        FileLock lock = null;
        try
        {
            channel = new RandomAccessFile( f, "rw" ).getChannel();
            lock = channel.lock();


            mojo.execute();


            assertTrue( true );
        }

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                        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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                            if (currentLock != null) {
                                currentLock.release();
                                currentLock = null;
                            }


                            currentLock = fileChannel.lock(0L, Long.MAX_VALUE, true);
                            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
                FileLock lock = null;
                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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      LOCK_FILES_DIR.mkdirs();
      try {
        RandomAccessFile raf = new RandomAccessFile(GLOBAL_LOCK_FILE,
            "rw");
        FileChannel channel = raf.getChannel();
        FileLock lock = channel.lock();
        globalFileChannel = channel;
        globalFileLock = lock;
        break;
      } catch (Throwable t) {
        ;

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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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        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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    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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    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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    if (fileChannel == null) {
      return;
    }
    FileLock fileLock = null;
    try {
      fileLock = fileChannel.lock();
      long position = fileChannel.position();
      long size = fileChannel.size();
      if (size != position) {
        fileChannel.position(size);
      }

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