public void addActivity(@NotNull UiActivity activity, @NotNull ModalityState state) {
      getOrCreateBusy(activity);
      final Set<BusyImpl> busies = myObject2Activities.keySet();
      for (BusyImpl each : busies) {
        each.addActivity(activity, state);
      }
    }
public void addActivity(@NotNull UiActivity activity, @NotNull ModalityState state)