code: public void alarm(Object thandle)
    {
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
        SibTr.entry(tc, "alarm", thandle);
  
      parent.expiryAlarm(this);
  
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
        SibTr.exit(tc, "alarm");
    }
docs: The get request has expired. Will tell the parent to expire this request (i.e. change the tick in the stream
  to completed) only if the transition to (!satisfied and expired) is successful
  @param thandle