code: protected void fireBackendUpdated(E e) {
          for (int i = 0, n = this.listenerList.size(); i < n; i++) {
              this.listenerList.get(i).backendUpdated(e);
          }
      }
docs: Notifies all registered listeners when the backend has been updated.
  
  @param e a {@link BackendUpdatedEvent} representing an update.