services:
  notifications_log.notifier:
    class: Drupalnotifications_logEventSubscriberNotifierSubscriber
    arguments: ['@plugin.manager.notifier', '@entity_type.manager',
                '@current_user', '@logger.factory']
    tags:
      - { name: event_subscriber }

  plugin.manager.notifier:
    class: Drupalnotifications_logPluginNotifierManager
    parent: default_plugin_manager

static function getSubscribedEvents() {
    /** @var NotifierManager $notifierManager */
    $notifierManager = Drupal::service('plugin.manager.notifier');

    $events = [];
    foreach ($notifierManager->getNotifierEventNames() as $eventName => $plugin_id) {
      $events[$eventName] = ['onNotification', 0];
    }

    return $events;
  }

/**
   * {@inheritdoc}
   *
   * We can't return the plugin-based events here, but we set up
   * a response to do that at a later stage
   *
   */
  static function getSubscribedEvents() {
    // Subscribe to kernel request very early.
    $events[KernelEvents::REQUEST][] = ['onRequest', 900];

    return $events;
  }

  /**
   * Add the plugin events at this stage - early in the process.
   *
   * @param GetResponseEvent $event
   */
  public function onRequest(GetResponseEvent $event) {
    // Find every event mentioned in a plugin...
    foreach ($this->notifierManager->getNotifierEventNames() as $eventName => $plugin_id) {
      // Add the event to the dispatcher as a listener, to call my method...
      $this->dispatcher->addListener($eventName, [$this, 'onNotification']);
    }
  }