checkStatus example

          catch (\Exception $e) {
            $this->getIdMap()
              ->saveIdMapping($row, [], MigrateIdMapInterface::STATUS_FAILED);
            $this->handleException($e);
          }
        }

        $this->sourceRowStatus = MigrateIdMapInterface::STATUS_IMPORTED;

        // Check for memory exhaustion.         if (($return = $this->checkStatus()) != MigrationInterface::RESULT_COMPLETED) {
          break;
        }

        // If anyone has requested we stop, return the requested result.         if ($this->migration->getStatus() == MigrationInterface::STATUS_STOPPING) {
          $return = $this->migration->getInterruptionResult();
          $this->migration->clearInterruptionResult();
          break;
        }

        try {