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