Preload services

Instantiate all services in the Dependency Injection Container.

Stateless (shared) services in the Dependency Injection Container will be
instantiated once by the first Request that require them, and then their
instance will be reused in all other Requests.

This also allows to "warm up" part of autoloading.

Author: gnugat

Bootstraps/Symfony.php

@@ -1,7 +1,10 @@
 <?php
 
 namespace PHPPM\Bootstraps;
+
+use Stack\Builder;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\KernelInterface;
 
 /**
  * A default bootstrap for the Symfony framework
@@ -47,6 +50,7 @@ public function getApplication()
         $request = new Request();
         $request->setMethod(Request::METHOD_HEAD);
         $app->handle($request);
+        $this->preloadServices($app);
 
         return $app;
     }
@@ -68,4 +72,23 @@ protected function includeAutoload()
             require_once $symfonyAutoload;
         }
     }
+
+    /**
+     * Instantiate all services in the Dependency Injection Container.
+     *
+     * Stateless (shared) services in the Dependency Injection Container will be
+     * instantiated once by the first Request that require them, and then their
+     * instance will be reused in all other Requests.
+     * This also allows to "warm up" part of autoloading.
+     *
+     * @param KernelInterface $kernel
+     */
+    protected function preloadServices(KernelInterface $kernel)
+    {
+        $kernel->boot();
+        $container = $kernel->getContainer();
+        foreach ($container->getServiceIds() as $serviceId) {
+            $container->get($serviceId);
+        }
+    }
 }