code: @SafeVarargs
      private final boolean notifyOnLoad(@NonNull final KeyType key,
                                         @NonNull final ParamType... params) {
          boolean result = true;
  
          for (Listener<DataType, KeyType, ViewType, ParamType> listener : listeners) {
              result &= listener.onLoadData(this, key, params);
          }
  
          return result;
      }
docs: Notifies all listeners, that the data binder starts to load data asynchronously.
  
  @param key
  The key of the data, which should be loaded, as an instance of the generic type
  KeyType. The key may not be null
  @param params
  An array, which contains optional parameters, as an array of the type ParamType or an
  empty array, if no parameters should be used
  @return True, if loading the data should be proceeded, false otherwise