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1 <?php
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2
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3 namespace Drupal\Core\EventSubscriber;
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4
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5 use Drupal\Core\Cache\Cache;
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6 use Drupal\Core\Database\ReplicaKillSwitch;
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7 use Drupal\Core\Lock\LockBackendInterface;
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8 use Drupal\Core\Menu\MenuLinkManagerInterface;
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9 use Drupal\Core\Routing\RoutingEvents;
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10 use Symfony\Component\EventDispatcher\Event;
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11 use Drupal\Core\Database\Connection;
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12 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
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13
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14 /**
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15 * Rebuilds the default menu links and runs menu-specific code if necessary.
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16 */
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17 class MenuRouterRebuildSubscriber implements EventSubscriberInterface {
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18
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19 /**
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20 * @var \Drupal\Core\Lock\LockBackendInterface
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21 */
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22 protected $lock;
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23
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24 /**
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25 * The menu link plugin manager.
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26 *
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27 * @var \Drupal\Core\Menu\MenuLinkManagerInterface
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28 */
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29 protected $menuLinkManager;
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30
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31 /**
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32 * The replica kill switch.
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33 *
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34 * @var \Drupal\Core\Database\ReplicaKillSwitch
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35 */
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36 protected $replicaKillSwitch;
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37
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38 /**
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39 * The database connection.
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40 *
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41 * @var \Drupal\Core\Database\Connection
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42 */
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43 protected $connection;
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44
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45 /**
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46 * Constructs the MenuRouterRebuildSubscriber object.
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47 *
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48 * @param \Drupal\Core\Lock\LockBackendInterface $lock
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49 * The lock backend.
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50 * @param \Drupal\Core\Menu\MenuLinkManagerInterface $menu_link_manager
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51 * The menu link plugin manager.
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52 * @param \Drupal\Core\Database\Connection $connection
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53 * The database connection.
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54 * @param \Drupal\Core\Database\ReplicaKillSwitch $replica_kill_switch
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55 * The replica kill switch.
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56 */
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57 public function __construct(LockBackendInterface $lock, MenuLinkManagerInterface $menu_link_manager, Connection $connection, ReplicaKillSwitch $replica_kill_switch) {
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58 $this->lock = $lock;
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59 $this->menuLinkManager = $menu_link_manager;
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60 $this->connection = $connection;
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61 $this->replicaKillSwitch = $replica_kill_switch;
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62 }
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63
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64 /**
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65 * Rebuilds the menu links and deletes the local_task cache tag.
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66 *
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67 * @param \Symfony\Component\EventDispatcher\Event $event
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68 * The event object.
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69 */
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70 public function onRouterRebuild(Event $event) {
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71 $this->menuLinksRebuild();
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72 Cache::invalidateTags(['local_task']);
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73 }
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74
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75 /**
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76 * Perform menu-specific rebuilding.
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77 */
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78 protected function menuLinksRebuild() {
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79 if ($this->lock->acquire(__FUNCTION__)) {
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80 $transaction = $this->connection->startTransaction();
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81 try {
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82 // Ensure the menu links are up to date.
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83 $this->menuLinkManager->rebuild();
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84 // Ignore any database replicas temporarily.
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85 $this->replicaKillSwitch->trigger();
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86 }
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87 catch (\Exception $e) {
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88 $transaction->rollBack();
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89 watchdog_exception('menu', $e);
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90 }
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91
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92 $this->lock->release(__FUNCTION__);
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93 }
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94 else {
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95 // Wait for another request that is already doing this work.
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96 // We choose to block here since otherwise the router item may not
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97 // be available during routing resulting in a 404.
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98 $this->lock->wait(__FUNCTION__);
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99 }
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100 }
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101
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102 /**
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103 * {@inheritdoc}
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104 */
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105 public static function getSubscribedEvents() {
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106 // Run after CachedRouteRebuildSubscriber.
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107 $events[RoutingEvents::FINISHED][] = ['onRouterRebuild', 100];
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108 return $events;
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109 }
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110
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111 }
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