code: private void fireTangoInterfaceChangeEvent(TangoInterfaceChange tangoChange, EventData eventData) {
          TangoInterfaceChangeEvent event = new TangoInterfaceChangeEvent(tangoChange, eventData);
          ArrayList<EventListener>    listeners = event_listeners.getListeners(ITangoInterfaceChangeListener.class);
          for (EventListener eventListener : listeners) {
              ((ITangoInterfaceChangeListener) eventListener).interface_change(event);
          }
      }
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