code: public Observable<AppServicePlanInner> updateAsync(String resourceGroupName, String name, AppServicePlanPatchResource appServicePlan) {
          return updateWithServiceResponseAsync(resourceGroupName, name, appServicePlan).map(new Func1<ServiceResponse<AppServicePlanInner>, AppServicePlanInner>() {
              @Override
              public AppServicePlanInner call(ServiceResponse<AppServicePlanInner> response) {
                  return response.body();
              }
          });
      }
docs: Creates or updates an App Service Plan.
  Creates or updates an App Service Plan.
  
  @param resourceGroupName Name of the resource group to which the resource belongs.
  @param name Name of the App Service plan.
  @param appServicePlan Details of the App Service plan.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the AppServicePlanInner object