code: private PiggyBack existingPiggyBackForInserting() {
      Object _misc = misc;
      if (_misc instanceof SimpleTimerTask) {
        return new TaskPiggyBack((SimpleTimerTask) _misc, null);
      }
      return (PiggyBack) _misc;
    }
docs: We want to add a new piggy back. Check for timer task and convert it to
  piggy back.