ConcurrentPartialFileLocking_Run.java

@Override
public void run() {
    File file = new File(filename);

    try (RandomAccessFile randomAccessFile = new RandomAccessFile(file, "rw");
         FileChannel channel = randomAccessFile.getChannel()) {

        System.out.println(threadName + " attempting to acquire a lock on region [" + 
                           startPosition + ", " + (startPosition + regionSize) + "]");
        FileLock lock = null;
        try {
            lock = channel.lock(startPosition, regionSize, false); // Exclusive lock.
            if (lock != null) {
                System.out.println(threadName + " acquired lock on the specified region!");

                // Simulate working with the file.
                System.out.println(threadName + " Performing operations on the locked region...");

                // Read and print the content of the locked region.
                ByteBuffer buffer = ByteBuffer.allocate((int) regionSize);
                channel.position(startPosition);
                channel.read(buffer);
                buffer.flip();
                byte[] bytes = new byte[buffer.remaining()];
                buffer.get(bytes);
                System.out.println(threadName + " Region Content: \"" + new String(bytes) + "\"");

                Thread.sleep(2000); // Simulate some work.
                System.out.println(threadName + " Finished operations on the locked region.");
            }
        } catch (OverlappingFileLockException e) {
            System.err.println(threadName + ": File region is already locked by another process or thread.");
        } catch (IOException | InterruptedException e) {
            System.err.println(threadName + ": Error during lock operation: " + e.getMessage());
        } finally {
            if (lock != null) {
                System.out.println(threadName + " Attempting to release lock.");
                lock.release();
                System.out.println(threadName + " Lock released.");
            }
        }
    } catch (IOException e) {
        System.err.println(threadName + ": Error accessing file: " + e.getMessage());
    }
}