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.

            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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        }
    }


    public long transferFrom(ReadableByteChannel channel) throws IOException {
        final FileChannel out = new FileOutputStream(file).getChannel();
        final FileLock lock = out.lock();
        try {
            final int buffsize = 4096;
            long position = 0;
            long read;
            while ((read = out.transferFrom(channel, position, buffsize)) > 0) {

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    public void test_release() throws Exception {
        File file = File.createTempFile("test", "tmp");
        file.deleteOnExit();
        FileOutputStream fout = new FileOutputStream(file);
        FileChannel fileChannel = fout.getChannel();
        FileLock fileLock = fileChannel.lock();
        fileChannel.close();
        try {
            fileLock.release();
            fail("should throw ClosedChannelException");
        } catch (ClosedChannelException e) {

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        }


        // release after release
        fout = new FileOutputStream(file);
        fileChannel = fout.getChannel();
        fileLock = fileChannel.lock();
        fileLock.release();
        fileChannel.close();
        try {
            fileLock.release();
            fail("should throw ClosedChannelException");

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


            mojo.execute();


            fail( "Should fail to delete a file that is locked" );
        }

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