code: private void fireTangoPipeEvent(TangoPipe tangoPipe, EventData eventData) {
          TangoPipeEvent tangoPipeEvent = new TangoPipeEvent(tangoPipe, eventData);
          // Notifying those that are interested in this event
          ArrayList<EventListener> listeners = event_listeners.getListeners(ITangoPipeListener.class);
          for (EventListener eventListener : listeners) {
              ((ITangoPipeListener) eventListener).pipe(tangoPipeEvent);
          }
      }
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