RegisterServicesForDestructionPass.php

<?php

/**
 * @file
 * Contains \Drupal\Core\DependencyInjection\Compiler\RegisterServicesForDestructionPass.
 */
namespace Drupal\Core\DependencyInjection\Compiler;

use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;

/**
 * Adds services tagged "needs_destruction" to the "kernel_destruct_subscriber"
 * service.
 */
class RegisterServicesForDestructionPass implements CompilerPassInterface {

  /**
   * Implements \Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface::process().
   */
  public function process(ContainerBuilder $container) {
    if (!$container
      ->hasDefinition('kernel_destruct_subscriber')) {
      return;
    }
    $definition = $container
      ->getDefinition('kernel_destruct_subscriber');
    $services = $container
      ->findTaggedServiceIds('needs_destruction');
    foreach ($services as $id => $attributes) {
      $definition
        ->addMethodCall('registerService', array(
        $id,
      ));
    }
  }

}