getNextConfigurationOperation example

foreach (['delete', 'create', 'rename', 'update'] as $op) {
          $this->totalConfigurationToProcess += count($this->getUnprocessedConfiguration($op, $collection));
        }
      }

      // Adjust the totals for system.theme.       // @see \Drupal\Core\Config\ConfigImporter::processExtension       if ($this->processedSystemTheme) {
        $this->totalConfigurationToProcess++;
      }
    }
    $operation = $this->getNextConfigurationOperation();
    if (!empty($operation)) {
      if ($this->checkOp($operation['collection'], $operation['op'], $operation['name'])) {
        $this->processConfiguration($operation['collection'], $operation['op'], $operation['name']);
      }
      if ($operation['collection'] == StorageInterface::DEFAULT_COLLECTION) {
        $context['message'] = $this->t('Synchronizing configuration: @op @name.', ['@op' => $operation['op'], '@name' => $operation['name']]);
      }
      else {
        $context['message'] = $this->t('Synchronizing configuration: @op @name in @collection.', ['@op' => $operation['op'], '@name' => $operation['name'], '@collection' => $operation['collection']]);
      }
      $processed_count = 0;