// Establish an ordering from writeLockA -> writeLockB.
    writeLockA.lock();
    writeLockB.lock();
    writeLockB.unlock();
    writeLockA.unlock();

    // Establish an ordering from writeLockB -> writeLockC.
    writeLockB.lock();
    writeLockC.lock();
    writeLockB.unlock();

    // writeLockC -> writeLockA should fail.
    PotentialDeadlockException expected =

    public void releaseLease(Smb2LeaseKey key) {
        lock.writeLock().lock();
        try {
            LeaseEntry entry = leases.remove(key);
            if (entry != null) {
                pathToLease.remove(entry.getPath());
                log.debug("Released lease for path: {} with key: {}", entry.getPath(), key);
            }
        } finally {
            lock.writeLock().unlock();
        }
    }

    /**

            }
        } finally {
            lock.writeLock().unlock();
        }
    }

    /**
     * Remove a child entry
     *
     * @param childName child file name
     */
    public void removeChild(String childName) {
        lock.writeLock().lock();
        try {
            if (children.remove(childName) != null) {

        lock.writeLock().lock();
        try {
            handles.put(path, info);
            guidToHandle.put(guid, info);

            if (type == HandleType.PERSISTENT) {
                persistHandle(info);
            }
        } finally {
            lock.writeLock().unlock();
        }

		subrouter.Methods(http.MethodPost).Path("/v1/force-unlock").HandlerFunc(lockServer.ForceUnlockHandler)

		nodes[i] = httptest.NewServer(router)
	}
}

const WriteLock = -1

type lockServer struct {
	mutex sync.Mutex
	// Map of locks, with negative value indicating (exclusive) write lock
	// and positive values indicating number of read locks
	lockMap map[string]int64

    
    public void markComplete() {
        lock.writeLock().lock();
        try {
            this.isComplete = true;
            this.hasChanges = false;
            this.lastUpdateTime = System.currentTimeMillis();
        } finally {
            lock.writeLock().unlock();
        }
    }
    
    public void invalidate() {
        lock.writeLock().lock();
        try {
            children.clear();

    Lock readLock = striped.get(key).readLock();
    WeakReference<Object> garbage = new WeakReference<>(new Object());
    GcFinalization.awaitClear(garbage);
    Lock writeLock = striped.get(key).writeLock();
    readLock.lock();
    assertFalse(writeLock.tryLock());
    readLock.unlock();
  }

  @AndroidIncompatible // Presumably GC doesn't trigger, despite our efforts.
  public void testStrongImplementations() {

    Lock readLock = striped.get(key).readLock();
    WeakReference<Object> garbage = new WeakReference<>(new Object());
    GcFinalization.awaitClear(garbage);
    Lock writeLock = striped.get(key).writeLock();
    readLock.lock();
    assertFalse(writeLock.tryLock());
    readLock.unlock();
  }

  @AndroidIncompatible // Presumably GC doesn't trigger, despite our efforts.
  public void testStrongImplementations() {

      this.writeLock = new CycleDetectingReentrantWriteLock(this);
      this.lockGraphNode = Preconditions.checkNotNull(lockGraphNode);
    }

    ///// Overridden ReentrantReadWriteLock methods. /////

    @Override
    public ReadLock readLock() {
      return readLock;
    }

    @Override
    public WriteLock writeLock() {
      return writeLock;
    }

        }
    }
    
    public void releaseLease(Smb2LeaseKey key) {
        lock.writeLock().lock();
        try {
            LeaseEntry entry = leases.remove(key);
            if (entry != null) {
                pathToLease.remove(entry.path);
            }
        } finally {
            lock.writeLock().unlock();
        }
    }
    
    private void flushCachedWrites(String path) {