public function RegisterEventSubscribersPass::process in Drupal 8

Same name and namespace in other branches

1. 9 core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterEventSubscribersPass.php \Drupal\Core\DependencyInjection\Compiler\RegisterEventSubscribersPass::process()

File

core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterEventSubscribersPass.php, line 16

Class

RegisterEventSubscribersPass

Registers all event subscribers to the event dispatcher.

Namespace

Drupal\Core\DependencyInjection\Compiler

Code

public function process(ContainerBuilder $container) {
  if (!$container
    ->hasDefinition('event_dispatcher')) {
    return;
  }
  $definition = $container
    ->getDefinition('event_dispatcher');
  $event_subscriber_info = [];
  foreach ($container
    ->findTaggedServiceIds('event_subscriber') as $id => $attributes) {

    // We must assume that the class value has been correctly filled, even if
    // the service is created by a factory.
    $class = $container
      ->getDefinition($id)
      ->getClass();
    $refClass = new \ReflectionClass($class);
    $interface = 'Symfony\\Component\\EventDispatcher\\EventSubscriberInterface';
    if (!$refClass
      ->implementsInterface($interface)) {
      throw new \InvalidArgumentException(sprintf('Service "%s" must implement interface "%s".', $id, $interface));
    }

    // Get all subscribed events.
    foreach ($class::getSubscribedEvents() as $event_name => $params) {
      if (is_string($params)) {
        $priority = 0;
        $event_subscriber_info[$event_name][$priority][] = [
          'service' => [
            $id,
            $params,
          ],
        ];
      }
      elseif (is_string($params[0])) {
        $priority = isset($params[1]) ? $params[1] : 0;
        $event_subscriber_info[$event_name][$priority][] = [
          'service' => [
            $id,
            $params[0],
          ],
        ];
      }
      else {
        foreach ($params as $listener) {
          $priority = isset($listener[1]) ? $listener[1] : 0;
          $event_subscriber_info[$event_name][$priority][] = [
            'service' => [
              $id,
              $listener[0],
            ],
          ];
        }
      }
    }
  }
  foreach (array_keys($event_subscriber_info) as $event_name) {
    krsort($event_subscriber_info[$event_name]);
  }
  $definition
    ->addArgument($event_subscriber_info);
}