Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Core\EventSubscriber;
Chris@0: 
Chris@0: use Symfony\Component\DependencyInjection\ContainerAwareInterface;
Chris@0: use Symfony\Component\DependencyInjection\ContainerAwareTrait;
Chris@0: use Symfony\Component\EventDispatcher\EventSubscriberInterface;
Chris@0: use Symfony\Component\HttpKernel\Event\PostResponseEvent;
Chris@0: use Symfony\Component\HttpKernel\KernelEvents;
Chris@0: 
Chris@0: /**
Chris@0:  * Destructs services that are initiated and tagged with "needs_destruction".
Chris@0:  *
Chris@0:  * @see \Drupal\Core\DestructableInterface
Chris@0:  */
Chris@0: class KernelDestructionSubscriber implements EventSubscriberInterface, ContainerAwareInterface {
Chris@0: 
Chris@0:   use ContainerAwareTrait;
Chris@0:   /**
Chris@0:    * Holds an array of service ID's that will require destruction.
Chris@0:    *
Chris@0:    * @var array
Chris@0:    */
Chris@0:   protected $services = [];
Chris@0: 
Chris@0:   /**
Chris@0:    * Registers a service for destruction.
Chris@0:    *
Chris@0:    * Calls to this method are set up in
Chris@0:    * RegisterServicesForDestructionPass::process().
Chris@0:    *
Chris@0:    * @param string $id
Chris@0:    *   Name of the service.
Chris@0:    */
Chris@0:   public function registerService($id) {
Chris@0:     $this->services[] = $id;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Invoked by the terminate kernel event.
Chris@0:    *
Chris@0:    * @param \Symfony\Component\HttpKernel\Event\PostResponseEvent $event
Chris@0:    *   The event object.
Chris@0:    */
Chris@0:   public function onKernelTerminate(PostResponseEvent $event) {
Chris@0:     foreach ($this->services as $id) {
Chris@0:       // Check if the service was initialized during this request, destruction
Chris@0:       // is not necessary if the service was not used.
Chris@0:       if ($this->container->initialized($id)) {
Chris@0:         $service = $this->container->get($id);
Chris@0:         $service->destruct();
Chris@0:       }
Chris@0:     }
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Registers the methods in this class that should be listeners.
Chris@0:    *
Chris@0:    * @return array
Chris@0:    *   An array of event listener definitions.
Chris@0:    */
Chris@0:   public static function getSubscribedEvents() {
Chris@17:     $events[KernelEvents::TERMINATE][] = ['onKernelTerminate', 100];
Chris@0:     return $events;
Chris@0:   }
Chris@0: 
Chris@0: }