code: protected void dispatchNotifications ()
      {
          for (int ii = 0, nn = _notify.size(); ii < nn; ii++) {
              Tuple<ObserverList<Object>,ObserverOp<Object>> tuple = _notify.get(ii);
              tuple.left.apply(tuple.right);
          }
          _notify.clear();
      }
docs: Dispatches all queued media notifications.