function GenericEventSubscriber::getSubscribedEvents

File

src/EventSubscriber/GenericEventSubscriber.php, line 71

Class

GenericEventSubscriber

Subscribes to Symfony events and maps them to Rules events.

Namespace

Code

public static function getSubscribedEvents() {
  // Register this listener for every event that is used by a reaction rule.
  $events = [];
  $callback = [
    'onRulesEvent',
    100,
  ];
  // If there is no state service there is nothing we can do here. This static
  // method could be called early when the container is built, so the state
  // service might not always be available.
  if (!\Drupal::hasService('state')) {
    return [];
  }
  // Since we cannot access the reaction rule config storage here we have to
  // use the state system to provide registered Rules events. The Reaction
  // Rule storage is responsible for keeping the registered events up to date
  // in the state system.
  // @see \Drupal\rules\Entity\ReactionRuleStorage
  $state = \Drupal::state();
  $registered_event_names = $state->get('rules.registered_events');
  if (!empty($registered_event_names)) {
    foreach ($registered_event_names as $event_name) {
      $events[$event_name][] = $callback;
    }
  }
  return $events;
}