code: public Observable<List<EventTypeInner>> listEventTypesAsync(String topicTypeName) {
          return listEventTypesWithServiceResponseAsync(topicTypeName).map(new Func1<ServiceResponse<List<EventTypeInner>>, List<EventTypeInner>>() {
              @Override
              public List<EventTypeInner> call(ServiceResponse<List<EventTypeInner>> response) {
                  return response.body();
              }
          });
      }
docs: List event types.
  List event types for a topic type.
  
  @param topicTypeName Name of the topic type
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the List&lt;EventTypeInner&gt; object