private synchronized void assertAllPointersDisposed() {
    for (Map.Entry<VirtualFilePointerListener, FilePointerPartNode> entry : myPointers.entrySet()) {
      FilePointerPartNode root = entry.getValue();
      ArrayList<FilePointerPartNode> left = new ArrayList<FilePointerPartNode>();
      root.getPointersUnder(null, false, "", left);
      if (!left.isEmpty()) {
        VirtualFilePointerImpl p = left.get(0).leaf;
        try {
          p.throwDisposalError("Not disposed pointer: " + p);
        } finally {
          for (FilePointerPartNode pair : left) {
            VirtualFilePointerImpl pointer = pair.leaf;
            pointer.dispose();
          }
        }
      }
    }

    synchronized (myContainers) {
      if (!myContainers.isEmpty()) {
        VirtualFilePointerContainerImpl container = myContainers.iterator().next();
        container.throwDisposalError("Not disposed container");
      }
    }
  }
  @Override
  public void after(@NotNull final List<? extends VFileEvent> events) {
    incModificationCount();

    for (FilePointerPartNode node : myPointersToUpdateUrl) {
      synchronized (this) {
        VirtualFilePointerImpl pointer = node.leaf;
        String urlBefore = pointer.getUrlNoUpdate();
        Pair<VirtualFile, String> after = node.update();
        String urlAfter = after.second;
        if (URL_COMPARATOR.compare(urlBefore, urlAfter) != 0) {
          // url has changed, reinsert
          FilePointerPartNode root = myPointers.get(pointer.getListener());
          int useCount = node.useCount;
          node.remove();
          FilePointerPartNode newNode =
              root.findPointerOrCreate(VfsUtilCore.urlToPath(urlAfter), 0, after);
          VirtualFilePointerImpl existingPointer = newNode.leaf;
          if (existingPointer != null) {
            // can happen when e.g. file renamed to the existing file
            // merge two pointers
            pointer.myNode = newNode;
          } else {
            newNode.associate(pointer, after);
          }
          newNode.incrementUsageCount(useCount);
        }
      }
    }

    VirtualFilePointer[] pointersToFireArray = toPointers(myPointersToFire);
    for (VirtualFilePointer pointer : pointersToFireArray) {
      ((VirtualFilePointerImpl) pointer).myNode.update();
    }

    for (EventDescriptor event : myEvents) {
      event.fireAfter();
    }

    if (pointersToFireArray.length != 0) {
      myBus.syncPublisher(VirtualFilePointerListener.TOPIC).validityChanged(pointersToFireArray);
    }

    myPointersToUpdateUrl = Collections.emptyList();
    myEvents = Collections.emptyList();
    myPointersToFire = Collections.emptyList();
    for (FilePointerPartNode root : myPointers.values()) {
      root.checkConsistency();
    }
  }
 @TestOnly
 public void assertPointersAreDisposed() {
   List<VirtualFilePointerImpl> pointers = new ArrayList<VirtualFilePointerImpl>();
   addAllPointers(pointers);
   try {
     for (VirtualFilePointerImpl pointer : pointers) {
       if (!myStoredPointers.contains(pointer)) {
         pointer.throwDisposalError("Virtual pointer hasn't been disposed: " + pointer);
       }
     }
   } finally {
     myStoredPointers.clear();
   }
 }
    @Override
    public void dispose() {
      synchronized (ourInstances) {
        ourInstances.remove(myParent);

        for (Object o : myCounts.keys()) {
          VirtualFilePointerImpl pointer = (VirtualFilePointerImpl) o;
          int disposeCount = myCounts.get(pointer);
          int after = pointer.myNode.incrementUsageCount(-disposeCount + 1);
          LOG.assertTrue(after > 0, after);
          pointer.dispose();
        }
      }
    }