code: 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);
      }
docs: Gets the list of images under a resource group.
  
  @param resourceGroupName The name of the resource group.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object