docs: public ServiceFuture<List<ImageInner>> listByResourceGroupAsync(final String resourceGroupName, final ListOperationCallback<ImageInner> serviceCallback) {
          return AzureServiceFuture.fromPageResponse(
              listByResourceGroupSinglePageAsync(resourceGroupName),
              new Func1<String, Observable<ServiceResponse<Page<ImageInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<ImageInner>>> call(String nextPageLink) {
                      return listByResourceGroupNextSinglePageAsync(nextPageLink);
                  }
              },
              serviceCallback);
      }