class MenuRouterRebuildSubscriber

Same name in other branches
  1. 9 core/lib/Drupal/Core/EventSubscriber/MenuRouterRebuildSubscriber.php \Drupal\Core\EventSubscriber\MenuRouterRebuildSubscriber
  2. 10 core/lib/Drupal/Core/EventSubscriber/MenuRouterRebuildSubscriber.php \Drupal\Core\EventSubscriber\MenuRouterRebuildSubscriber
  3. 11.x core/lib/Drupal/Core/EventSubscriber/MenuRouterRebuildSubscriber.php \Drupal\Core\EventSubscriber\MenuRouterRebuildSubscriber

Rebuilds the default menu links and runs menu-specific code if necessary.

Hierarchy

Expanded class hierarchy of MenuRouterRebuildSubscriber

1 string reference to 'MenuRouterRebuildSubscriber'
core.services.yml in core/core.services.yml
core/core.services.yml
1 service uses MenuRouterRebuildSubscriber
menu.rebuild_subscriber in core/core.services.yml
Drupal\Core\EventSubscriber\MenuRouterRebuildSubscriber

File

core/lib/Drupal/Core/EventSubscriber/MenuRouterRebuildSubscriber.php, line 17

Namespace

Drupal\Core\EventSubscriber
View source
class MenuRouterRebuildSubscriber implements EventSubscriberInterface {
    
    /**
     * @var \Drupal\Core\Lock\LockBackendInterface
     */
    protected $lock;
    
    /**
     * The menu link plugin manager.
     *
     * @var \Drupal\Core\Menu\MenuLinkManagerInterface
     */
    protected $menuLinkManager;
    
    /**
     * The replica kill switch.
     *
     * @var \Drupal\Core\Database\ReplicaKillSwitch
     */
    protected $replicaKillSwitch;
    
    /**
     * The database connection.
     *
     * @var \Drupal\Core\Database\Connection
     */
    protected $connection;
    
    /**
     * Constructs the MenuRouterRebuildSubscriber object.
     *
     * @param \Drupal\Core\Lock\LockBackendInterface $lock
     *   The lock backend.
     * @param \Drupal\Core\Menu\MenuLinkManagerInterface $menu_link_manager
     *   The menu link plugin manager.
     * @param \Drupal\Core\Database\Connection $connection
     *   The database connection.
     * @param \Drupal\Core\Database\ReplicaKillSwitch $replica_kill_switch
     *   The replica kill switch.
     */
    public function __construct(LockBackendInterface $lock, MenuLinkManagerInterface $menu_link_manager, Connection $connection, ReplicaKillSwitch $replica_kill_switch) {
        $this->lock = $lock;
        $this->menuLinkManager = $menu_link_manager;
        $this->connection = $connection;
        $this->replicaKillSwitch = $replica_kill_switch;
    }
    
    /**
     * Rebuilds the menu links and deletes the local_task cache tag.
     *
     * @param \Symfony\Component\EventDispatcher\Event $event
     *   The event object.
     */
    public function onRouterRebuild(Event $event) {
        $this->menuLinksRebuild();
        Cache::invalidateTags([
            'local_task',
        ]);
    }
    
    /**
     * Perform menu-specific rebuilding.
     */
    protected function menuLinksRebuild() {
        if ($this->lock
            ->acquire(__FUNCTION__)) {
            $transaction = $this->connection
                ->startTransaction();
            try {
                // Ensure the menu links are up to date.
                $this->menuLinkManager
                    ->rebuild();
                // Ignore any database replicas temporarily.
                $this->replicaKillSwitch
                    ->trigger();
            } catch (\Exception $e) {
                $transaction->rollBack();
                watchdog_exception('menu', $e);
            }
            $this->lock
                ->release(__FUNCTION__);
        }
        else {
            // Wait for another request that is already doing this work.
            // We choose to block here since otherwise the router item may not
            // be available during routing resulting in a 404.
            $this->lock
                ->wait(__FUNCTION__);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public static function getSubscribedEvents() {
        // Run after CachedRouteRebuildSubscriber.
        $events[RoutingEvents::FINISHED][] = [
            'onRouterRebuild',
            100,
        ];
        return $events;
    }

}

Members

Title Sort descending Modifiers Object type Summary
MenuRouterRebuildSubscriber::$connection protected property The database connection.
MenuRouterRebuildSubscriber::$lock protected property
MenuRouterRebuildSubscriber::$menuLinkManager protected property The menu link plugin manager.
MenuRouterRebuildSubscriber::$replicaKillSwitch protected property The replica kill switch.
MenuRouterRebuildSubscriber::getSubscribedEvents public static function
MenuRouterRebuildSubscriber::menuLinksRebuild protected function Perform menu-specific rebuilding.
MenuRouterRebuildSubscriber::onRouterRebuild public function Rebuilds the menu links and deletes the local_task cache tag.
MenuRouterRebuildSubscriber::__construct public function Constructs the MenuRouterRebuildSubscriber object.

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