Routing alter D8

gistfile1.txt

class RouteSubscriber extends RouteSubscriberBase {

  /**
   * {@inheritdoc}
   */
  protected function alterRoutes(RouteCollection $collection) {

    $front_page = \Drupal::config('system.site')->get('page.front');
    // Not getting the front value with the below process (followed: https://www.drupal.org/node/2187643)
    $route = $collection->get('page.front');
    \Drupal::logger('mod')->notice(var_export($route, TRUE)); // returns NULL
    \Drupal::logger('mod1')->notice(var_export($front_page, TRUE)); // returns the proper value.

    foreach ($collection as $route) {
      if ($route->getPath() == $front_page) {
        \Drupal::logger('mod2')->notice(var_export($route->getPath(), TRUE));
        $route->setDefaults(['_content' => [$this, 'content']]);
        break;
      }
    }

  }

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    $events = parent::getSubscribedEvents();
    // Ensure to run after the views route subscriber.
    // @see \Drupal\views\EventSubscriber
    $events[RoutingEvents::ALTER] = ['onAlterRoutes', -180];
    return $events;
  }

  /**
   * Content callback.
   */
  public static function content() {
    return ['#markup' => ''];
  }

}