code: public ServiceFuture<ImageInner> getByResourceGroupAsync(String resourceGroupName, String imageName, String expand, final ServiceCallback<ImageInner> serviceCallback) {
          return ServiceFuture.fromResponse(getByResourceGroupWithServiceResponseAsync(resourceGroupName, imageName, expand), serviceCallback);
      }
docs: Gets an image.
  
  @param resourceGroupName The name of the resource group.
  @param imageName The name of the image.
  @param expand The expand expression to apply on the operation.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object