code: @Override
    public void onNext(final String alarmId) {
      LOG.log(Level.INFO, "Alarm {0} triggered", alarmId);
      final ClientAlarm clientAlarm = this.alarmMap.remove(alarmId);
      if (clientAlarm != null) {
        clientAlarm.run();
      } else {
        LOG.log(Level.SEVERE, "Unknown alarm id {0}", alarmId);
      }
    }
docs: Alarm clock event handler.
  @param alarmId alarm identifier