test_helpers-1.0.0-alpha6/tests/modules/test_helpers_example/src/EventSubscriber/ConfigEventsSubscriber.php

<?php

declare(strict_types=1);

namespace Drupal\test_helpers_example\EventSubscriber;

use Drupal\Core\Config\ConfigCrudEvent;
use Drupal\Core\Config\ConfigEvents;
use Drupal\Core\Messenger\MessengerInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

/**
 * Implements EventSubscriber for SAVE and DELETE ConfigEvents.
 *
 * @package Drupal\test_helpers_example\EventSubscriber
 *
 * @see https://www.drupal.org/docs/creating-modules/subscribe-to-and-dispatch-events
 */
class ConfigEventsSubscriber implements EventSubscriberInterface {

  /**
   * The messenger.
   *
   * @var \Drupal\Core\Messenger\MessengerInterface
   */
  protected $messenger;

  /**
   * Constructs a new ConfigEventsSubscriber.
   *
   * @param \Drupal\Core\Messenger\MessengerInterface $messenger
   *   The messenger.
   */
  public function __construct(MessengerInterface $messenger) {
    $this->messenger = $messenger;
  }

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents(): array {
    return [
      ConfigEvents::SAVE => 'configSave',
      ConfigEvents::DELETE => 'configDelete',
    ];
  }

  /**
   * Reacts to a config object being saved.
   *
   * @param \Drupal\Core\Config\ConfigCrudEvent $event
   *   Config crud event.
   */
  public function configSave(ConfigCrudEvent $event) {
    $config = $event->getConfig();
    $this->messenger->addStatus('Saved config: ' . $config->getName());
  }

  /**
   * Reacts to a config object being deleted.
   *
   * @param \Drupal\Core\Config\ConfigCrudEvent $event
   *   Config crud event.
   */
  public function configDelete(ConfigCrudEvent $event) {
    $config = $event->getConfig();
    $this->messenger->addStatus('Deleted config: ' . $config->getName());
  }

}