hasRouteProviders example

  /** * Provides routes on route rebuild time. * * @param \Drupal\Core\Routing\RouteBuildEvent $event * The route build event. */
  public function onDynamicRouteEvent(RouteBuildEvent $event) {
    $route_collection = $event->getRouteCollection();
    foreach ($this->entityTypeManager->getDefinitions() as $entity_type) {
      if ($entity_type->hasRouteProviders()) {
        foreach ($this->entityTypeManager->getRouteProviders($entity_type->id()) as $route_provider) {
          // Allow to both return an array of routes or a route collection,           // like route_callbacks in the routing.yml file.
          $routes = $route_provider->getRoutes($entity_type);
          if ($routes instanceof RouteCollection) {
            $routes = $routes->all();
          }
          foreach ($routes as $route_name => $route) {
            // Don't override existing routes.             if (!$route_collection->get($route_name)) {