@Override
    public void onNext(final RxDebugger.Stats stats) {
      if (stats.removed) {
        @Nullable RxDebugger.Stats r = statsMap.remove(stats.subscriberId);
        if (null != r) {
          orderedStats.remove(r);
        }
      } else {
        @Nullable RxDebugger.Stats r = statsMap.put(stats.subscriberId, stats);
        if (null != r) {
          orderedStats.remove(r);
        }
        orderedStats.insert(stats);
      }

      if (null != debugFragment) {
        @Nullable DebugOverlayView debugOverlayView = debugFragment.getDebugOverlayView();
        if (null != debugOverlayView) {
          DebugOverlayView.ViewSummary rootViewSummary =
              DebugOverlayView.ViewSummary.create(orderedStats);
          debugOverlayView.setRootViewSummary(rootViewSummary);
        }
      }

      notifyDataSetChanged();
    }
    @Override
    public void onError(Throwable e) {
      statsMap.clear();
      orderedStats.clear();
      if (null != debugFragment) {
        @Nullable DebugOverlayView debugOverlayView = debugFragment.getDebugOverlayView();
        if (null != debugOverlayView) {
          debugOverlayView.setRootViewSummary(null);
        }
      }

      notifyDataSetChanged();
    }