@Override
    public LockGraphNode getLockGraphNode() {
      return lockGraphNode;
    }

    @Override
    public boolean isAcquiredByCurrentThread() {
      return isHeldByCurrentThread();
    }

    ///// Overridden ReentrantLock methods. /////

    @Override
    public void lock() {
      aboutToAcquire(this);
      try {
        super.lock();
      } finally {

    @Override
    public LockGraphNode getLockGraphNode() {
      return lockGraphNode;
    }

    @Override
    public boolean isAcquiredByCurrentThread() {
      return isHeldByCurrentThread();
    }

    ///// Overridden ReentrantLock methods. /////

    @Override
    public void lock() {
      aboutToAcquire(this);
      try {
        super.lock();
      } finally {

              return true;
            }
            return false;
          }
        }

        return false;
      } finally {
        unlock();
        if (!isHeldByCurrentThread()) { // don't clean up inside of put
          postWriteCleanup();
        }
      }
    }

    @CanIgnoreReturnValue