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

        // We got an IOException while trying to open the file.
        // Try the next file.
        continue;
    }
    try {
        FileLock fl = fc.tryLock();
        if (fl == null) {
            // We failed to get the lock.  Try next file.
      continue;
        }
        // We got the lock OK.

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        // We got an IOException while trying to open the file.
        // Try the next file.
        continue;
    }
    try {
        FileLock fl = fc.tryLock();
        if (fl == null) {
            // We failed to get the lock.  Try next file.
      continue;
        }
        // We got the lock OK.

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                FileChannel channel = raf.getChannel();
                // Create a exclusive (non-shared) lock that does not allow other readers ...
                if (block) {
                    fileLock = channel.lock(0, Long.MAX_VALUE, false);
                } else {
                    fileLock = channel.tryLock(0, Long.MAX_VALUE, false);
                    if (fileLock == null) {
                        // Couldn't immediately get our write-lock, so unlock the read lock and return ...
                        this.lock.writeLock().unlock();
                        return null;
                    }

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                    FileChannel channel = raf.getChannel();
                    // Create a shared lock that allows other readers ...
                    if (block) {
                        fileLock = channel.lock(0, Long.MAX_VALUE, true);
                    } else {
                        fileLock = channel.tryLock(0, Long.MAX_VALUE, true);
                        if (fileLock == null) {
                            // Couldn't immediately get our read-lock, so unlock the read lock and return ...
                            this.lock.readLock().unlock();
                            return null;
                        }

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      fail();
    } catch (ClosedChannelException expected) {
    }


    try {
      channel.tryLock();
      fail();
    } catch (ClosedChannelException expected) {
    }


    try {

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      fail();
    } catch (ClosedChannelException expected) {
    }


    try {
      channel.tryLock(0, 10, true);
      fail();
    } catch (ClosedChannelException expected) {
    }


    try {

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      fail();
    } catch (IllegalArgumentException expected) {
    }


    try {
      channel.tryLock(-1, 10, true);
      fail();
    } catch (IllegalArgumentException expected) {
    }


    try {

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      fail();
    } catch (IllegalArgumentException expected) {
    }


    try {
      channel.tryLock(0, -1, true);
      fail();
    } catch (IllegalArgumentException expected) {
    }
  }

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    assertNotNull(channel.lock());
    assertNotNull(channel.lock(0, 10, false));
    assertNotNull(channel.lock(0, 10, true));


    assertNotNull(channel.tryLock());
    assertNotNull(channel.tryLock(0, 10, false));
    assertNotNull(channel.tryLock(0, 10, true));


    FileLock lock = channel.lock();
    assertTrue(lock.isValid());

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    assertNotNull(channel.lock());
    assertNotNull(channel.lock(0, 10, false));
    assertNotNull(channel.lock(0, 10, true));


    assertNotNull(channel.tryLock());
    assertNotNull(channel.tryLock(0, 10, false));
    assertNotNull(channel.tryLock(0, 10, true));


    FileLock lock = channel.lock();
    assertTrue(lock.isValid());
    lock.release();

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