code: public void getTimeOid (ClientObject source, String timeBase,
                              TimeBaseService.GotTimeBaseListener listener)
          throws InvocationException
      {
          // look up the time base object in question
          TimeBaseObject time = getTimeBase(timeBase);
          if (time == null) {
              throw new InvocationException(NO_SUCH_TIME_BASE);
          }
          // and send the response
          listener.gotTimeOid(time.getOid());
      }
docs: Processes a request from a client to fetch the oid of the specified time object.