RegisterAccessChecksPass.php

<?php

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

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

/**
 * Adds services tagged 'access_check' to the access_manager service.
 */
class RegisterAccessChecksPass implements CompilerPassInterface {

  /**
   * Implements CompilerPassInterface::process().
   *
   * Adds services tagged 'access_check' to the access_manager service.
   */
  public function process(ContainerBuilder $container) {
    if (!$container
      ->hasDefinition('access_manager')) {
      return;
    }
    $access_manager = $container
      ->getDefinition('access_manager');
    foreach ($container
      ->findTaggedServiceIds('access_check') as $id => $attributes) {
      $access_manager
        ->addMethodCall('addCheckService', array(
        $id,
      ));
    }
  }

}