add ability to loading cached Routes for application using callback

src/Illuminate/Foundation/Configuration/ApplicationBuilder.php

@@ -218,6 +218,19 @@ class_exists(Folio::class)) {
         };
     }
 
+    /**
+     * Register loading cached routes for the application.
+     *
+     * @param  \Closure  $using
+     * @return $this
+     */
+    public function loadCachedRoutesUsing(Closure $using)
+    {
+        AppRouteServiceProvider::loadCachedRoutesUsing($using);
+
+        return $this;
+    }
+
     /**
      * Register the global middleware, middleware groups, and middleware aliases for the application.
      *

src/Illuminate/Foundation/Support/Providers/RouteServiceProvider.php

@@ -36,6 +36,13 @@ class RouteServiceProvider extends ServiceProvider
      */
     protected static $alwaysLoadRoutesUsing;
 
+    /**
+     * The callback that should be used to load the application's cached routes.
+     *
+     * @var \Closure|null
+     */
+    protected static $loadCachedRoutesUsing;
+
     /**
      * Register any application services.
      *
@@ -93,6 +100,17 @@ public static function loadRoutesUsing(?Closure $routesCallback)
         self::$alwaysLoadRoutesUsing = $routesCallback;
     }
 
+    /**
+     * Register the callback that will be used to load the application's cached routes.
+     *
+     * @param  \Closure|null  $loadCachedRoutesCallback
+     * @return void
+     */
+    public static function loadCachedRoutesUsing(?Closure $loadCachedRoutesCallback)
+    {
+        self::$loadCachedRoutesUsing = $loadCachedRoutesCallback;
+    }
+
     /**
      * Set the root controller namespace for the application.
      *
@@ -122,6 +140,11 @@ protected function routesAreCached()
      */
     protected function loadCachedRoutes()
     {
+        if (! is_null(self::$loadCachedRoutesUsing)) {
+            $this->app->call(self::$loadCachedRoutesUsing);
+
+            return;
+        }
         $this->app->booted(function () {
             require $this->app->getCachedRoutesPath();
         });