// exposed or used.
    private final CycleDetectingReentrantReadLock readLock;
    private final CycleDetectingReentrantWriteLock writeLock;

    private final LockGraphNode lockGraphNode;

    private CycleDetectingReentrantReadWriteLock(LockGraphNode lockGraphNode, boolean fair) {
      super(fair);
      this.readLock = new CycleDetectingReentrantReadLock(this);