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public final class Client {
  private final Lock lock = new ReentrantLock();

  public void doSomething(File file) {
    InputStream in = null;
    try {
      lock.lock(in = new FileInputStream(file);
      in = new FileInputStream(filelock.lock();

      // Perform operations on the open file

      lock.unlock();
    } catch (FileNotFoundException x) {
      // Handle exception
    } finally {
      if (in != null) {
        try {
          in.close();
        } catch (IOException x) {
          // Handle exception
        }  
      }
    }
  }
}