code: private void fireTangoQualityChangeEvent(TangoQualityChange tangoQualityChange, EventData eventData) {
          TangoQualityChangeEvent tangoQualityChangeEvent =
                  new TangoQualityChangeEvent(tangoQualityChange, eventData);
          // Notifying those that are interested in this event
          ArrayList<EventListener> listeners = event_listeners.getListeners(ITangoQualityChangeListener.class);
          for (EventListener eventListener : listeners) {
              ((ITangoQualityChangeListener) eventListener).qualityChange(tangoQualityChangeEvent);
          }
      }
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