code: public Observable<TopicTypeInfoInner> getAsync(String topicTypeName) {
          return getWithServiceResponseAsync(topicTypeName).map(new Func1<ServiceResponse<TopicTypeInfoInner>, TopicTypeInfoInner>() {
              @Override
              public TopicTypeInfoInner call(ServiceResponse<TopicTypeInfoInner> response) {
                  return response.body();
              }
          });
      }
docs: Get a topic type.
  Get information about a topic type.
  
  @param topicTypeName Name of the topic type
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the TopicTypeInfoInner object