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.

    Lock writeLock = writeLock(row);
    File file = getFile(row, true);
    try {
      FileInputStream fis = new FileInputStream(file);
      FileChannel channel = fis.getChannel();
      FileLock fileLock = channel.lock();
      try {
        Row<T, K> tStringRow = _get(row);
        if (tStringRow == null) return null;
        T mutate = tMutator.mutate(tStringRow.value);
        if (mutate != null) {

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    } catch (FileNotFoundException e) {
      try {
        if (file.createNewFile()) {
          FileInputStream fis = new FileInputStream(file);
          FileChannel channel = fis.getChannel();
          FileLock fileLock = channel.lock();
          try {
            if (file.length() == 0) {
              T created = tCreator.create();
              put(row, created);
              return new Row<T, K>(created, row);

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    // Clear any current interrupt (see LOGBACK-875)
    boolean interrupted = Thread.interrupted();


    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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        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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        out.close();


        fc = new RandomAccessFile(f, "rw").getChannel();
        anotherfc = new RandomAccessFile(f, "rw").getChannel();


        assertNotNull(fc.lock());


        ByteBuffer readBuf = ByteBuffer.allocate(100);
        ByteBuffer writeBuf = ByteBuffer.wrap("bytes".getBytes());
        try {
            try {

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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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            try
            {
                Properties props = new Properties();


                channel = new RandomAccessFile( touchfile, "rw" ).getChannel();
                lock = channel.lock( 0, channel.size(), false );


                if ( touchfile.canRead() )
                {
                    getLogger().debug( "Reading resolution-state from: " + touchfile );
                    ByteBuffer buffer = ByteBuffer.allocate( (int) channel.size() );

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            {
                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 );


                return props;

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            try
            {
                Properties props = new Properties();


                channel = new RandomAccessFile( touchfile, "rw" ).getChannel();
                lock = channel.lock( 0, channel.size(), false );


                if ( touchfile.canRead() )
                {
                    getLogger().debug( "Reading resolution-state from: " + touchfile );
                    ByteBuffer buffer = ByteBuffer.allocate( (int) channel.size() );

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