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

java.nio.channels.FileChannel.tryLock()
Attempts to acquire an exclusive lock on this file without blocking.
This is a convenience method for attempting to acquire a maximum length lock on the file. It is equivalent to:
```
 fileChannel.tryLock(0L, Long.MAX_VALUE, false) 
```
The method returns null if the acquisition would result in an overlapped lock with another OS process.
@return the file lock object, or null if the lock wouldoverlap an existing exclusive lock in another OS process. @throws ClosedChannelException the file channel is closed. @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 IOException if any I/O error occurs


    @Override
    protected ByteBuffer getXMPBytes(File jpeg) throws IOException, XMPReadException{
        ByteBuffer result = null;
        FileChannel input = (new FileInputStream(jpeg)).getChannel();
        FileLock lock = input.tryLock(0L, Long.MAX_VALUE, true);
        if(lock == null){
            input.close();
            throw new IOException("Cannot lock input file.");
        }
        try{

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                /*
                 * if lock is unsupported and IOException thrown, just let the
                 * IOException throws out and exit otherwise it will go into an
                 * undead cycle
                 */
                lock = channel.tryLock();
                if (null == lock) {
                    try{
                        fileStream.close();
                    }catch(Exception e){
                        //ignore

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        String f = getBaseDir() + "/fs/test.data";
        FileUtils.createDirectories(getBaseDir() + "/fs");
        FileChannel c = FileUtils.open(f, "rw");
        c.position(4000);
        c.write(ByteBuffer.wrap(new byte[1]));
        FileLock lock = c.tryLock();
        c.truncate(0);
        if (lock != null) {
            lock.release();
        }
        c.close();

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        String path = fsBase + "/test";
        assertEquals("test", FileUtils.getName(path));
        can = FilePath.get(fsBase).toRealPath().toString();
        String can2 = FileUtils.toRealPath(FileUtils.getParent(path));
        assertEquals(can, can2);
        FileLock lock = channel.tryLock();
        if (lock != null) {
            lock.release();
        }
        assertEquals(10000, channel.size());
        channel.close();

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            boolean writable;


            try {
                fos = new FileOutputStream(file, true);
                FileChannel channel = fos.getChannel();
                lock = channel.tryLock();
            } catch (IOException e) {
                log.warn("Error while attempting to lock the file: " + file.getName(), e);
                writable = false;
            } finally {
                if (lock != null) {

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        {
            channel = new RandomAccessFile(sourceFile, "rw").getChannel();


            // Try acquiring the lock without blocking. This method returns
            // null or throws an exception if the file is already locked.
            lock = channel.tryLock();
        }
        catch (FileNotFoundException fnfe)
        {
            throw new DefaultMuleException(FileMessages.fileDoesNotExist(sourceFile.getName()));
        }

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        FileLock lock = null;
        ByteBuffer bb = null;
        try {
            channel = fos.getChannel();
            if (channel != null) {
                lock = channel.tryLock();
            }
            bb = getTempByteBuffer();
        } catch (Throwable t) {
        }
        if (lock == null || bb == null || !bb.hasArray()) {

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        FileLock lock = null;
        ByteBuffer bb = null;
        try {
            channel = fos.getChannel();
            if (channel != null) {
                lock = channel.tryLock();
            }
            bb = getTempByteBuffer();
        } catch (Throwable t) {
        }
        if (lock == null || bb == null || !bb.hasArray()) {

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


                            break;

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