code: public Observable<OperationStatusResponseInner> getOperationStatusAsync(String userName, String operationUrl) {
          return getOperationStatusWithServiceResponseAsync(userName, operationUrl).map(new Func1<ServiceResponse<OperationStatusResponseInner>, OperationStatusResponseInner>() {
              @Override
              public OperationStatusResponseInner call(ServiceResponse<OperationStatusResponseInner> response) {
                  return response.body();
              }
          });
      }
docs: Gets the status of long running operation.
  
  @param userName The name of the user.
  @param operationUrl The operation url of long running operation
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the OperationStatusResponseInner object