code: public Observable<WorkflowRunInner> getAsync(String resourceGroupName, String workflowName, String runName) {
          return getWithServiceResponseAsync(resourceGroupName, workflowName, runName).map(new Func1<ServiceResponse<WorkflowRunInner>, WorkflowRunInner>() {
              @Override
              public WorkflowRunInner call(ServiceResponse<WorkflowRunInner> response) {
                  return response.body();
              }
          });
      }
docs: Gets a workflow run.
  
  @param resourceGroupName The resource group name.
  @param workflowName The workflow name.
  @param runName The workflow run name.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the WorkflowRunInner object