code: public Observable<List<EventSubscriptionInner>> listGlobalBySubscriptionForTopicTypeAsync(String topicTypeName) {
          return listGlobalBySubscriptionForTopicTypeWithServiceResponseAsync(topicTypeName).map(new Func1<ServiceResponse<List<EventSubscriptionInner>>, List<EventSubscriptionInner>>() {
              @Override
              public List<EventSubscriptionInner> call(ServiceResponse<List<EventSubscriptionInner>> response) {
                  return response.body();
              }
          });
      }
docs: List all global event subscriptions for a topic type.
  List all global event subscriptions under an Azure subscription 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;EventSubscriptionInner&gt; object