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.

            {
                Properties props = new Properties();


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


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


                String rawVal = props.getProperty( key );

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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.isTraceEnabled()) {
            LOG.trace("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("CamelFileLock", lock);
            exchange.setProperty("CamelFileLockName", lockFileName);
            return true;
        } else {

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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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        if (LOG.isTraceEnabled()) {
            LOG.trace("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("CamelFileLock", lock);
            exchange.setProperty("CamelFileLockName", lockFileName);
            return true;
        } else {

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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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            FileChannel ch = new RandomAccessFile(path, "rw").getChannel();
            FileLock lock = null;


            while (true) {
                try {
                    lock = ch.lock();
                    break;
                } catch (OverlappingFileLockException e) {
                }
                try {
                    Thread.sleep(100);

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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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        FileLock lock = null;
        try {


            out = new FileOutputStream(_file, true); // append mode
            channel = out.getChannel();
            lock = channel.lock(); // block till we get an OS-level exclusive lock


            PrintWriter writer = new PrintWriter(new OutputStreamWriter(out));
            serialize(message, writer);
            writer.close();

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

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