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<?php
namespace Drupal\Core\Routing;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Request;
/**
* A Route Provider front-end for all Drupal-stored routes.
*/
class RouteProviderLazyBuilder implements PreloadableRouteProviderInterface, EventSubscriberInterface {
/**
* The route provider service.
*
* @var \Drupal\Core\Routing\RouteProviderInterface
*/
protected $routeProvider;
/**
* The route building service.
*
* @var \Drupal\Core\Routing\RouteBuilderInterface
*/
protected $routeBuilder;
/**
* Flag to determine if the router has been rebuilt.
*
* @var bool
*/
protected $rebuilt = FALSE;
/**
* Flag to determine if router is currently being rebuilt.
*
* Used to prevent recursive router rebuilds during module installation.
* Recursive rebuilds can occur when route information is required by alter
* hooks that are triggered during a rebuild, for example,
* hook_menu_links_discovered_alter().
*
* @var bool
*/
protected $rebuilding = FALSE;
/**
* RouteProviderLazyBuilder constructor.
*
* @param \Drupal\Core\Routing\RouteProviderInterface $route_provider
* The route provider service.
* @param \Drupal\Core\Routing\RouteBuilderInterface $route_builder
* The route building service.
*/
public function __construct(RouteProviderInterface $route_provider, RouteBuilderInterface $route_builder) {
$this->routeProvider = $route_provider;
$this->routeBuilder = $route_builder;
}
/**
* Gets the real route provider service and rebuilds the router id necessary.
*
* @return \Drupal\Core\Routing\RouteProviderInterface
* The route provider service.
*/
protected function getRouteProvider() {
if (!$this->rebuilt && !$this->rebuilding) {
$this->routeBuilder->rebuild();
}
return $this->routeProvider;
}
/**
* {@inheritdoc}
*/
public function getRouteCollectionForRequest(Request $request) {
return $this->getRouteProvider()->getRouteCollectionForRequest($request);
}
/**
* {@inheritdoc}
*/
public function getRouteByName($name) {
return $this->getRouteProvider()->getRouteByName($name);
}
/**
* {@inheritdoc}
*/
public function preLoadRoutes($names) {
return $this->getRouteProvider()->preLoadRoutes($names);
}
/**
* {@inheritdoc}
*/
public function getRoutesByNames($names) {
return $this->getRouteProvider()->getRoutesByNames($names);
}
/**
* {@inheritdoc}
*/
public function getRoutesByPattern($pattern) {
return $this->getRouteProvider()->getRoutesByPattern($pattern);
}
/**
* {@inheritdoc}
*/
public function getAllRoutes() {
return $this->getRouteProvider()->getAllRoutes();
}
/**
* {@inheritdoc}
*/
public function reset() {
// Don't call getRouteProvider as this is results in recursive rebuilds.
return $this->routeProvider->reset();
}
/**
* Determines if the router has been rebuilt.
*
* @return bool
* TRUE is the router has been rebuilt, FALSE if not.
*/
public function hasRebuilt() {
return $this->rebuilt;
}
/**
* {@inheritdoc}
*/
public static function getSubscribedEvents(): array {
$events[RoutingEvents::DYNAMIC][] = ['routerRebuilding', 3000];
$events[RoutingEvents::FINISHED][] = ['routerRebuildFinished', -3000];
return $events;
}
/**
* Sets the router rebuilding flag to TRUE.
*/
public function routerRebuilding() {
$this->rebuilding = TRUE;
}
/**
* Sets the router rebuilding flag to FALSE.
*/
public function routerRebuildFinished() {
$this->rebuilding = FALSE;
$this->rebuilt = TRUE;
}
/**
* {@inheritdoc}
*/
public function getRouteAliases(string $route_name): iterable {
return $this->getRouteProvider()->getRouteAliases($route_name);
}
}
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