public function collectAction()
    {
        // @todo json
        $service = $this->getGarbageCollector();
        if ($service->collect()) {
            return $this->redirect()->toRoute('sc-admin/content-manager');
        }
        return $this->redirect()
            ->toRoute(
                'sc-admin/file/delete',
                ['random' => Stdlib::randomKey(6)]
            )
            ->setStatusCode(303);
    }