在Symfony 3.4中使用这样的服务是正确的吗？

services:
    my_service:
        class: App\Services\MyService
        arguments:
            - '@doctrine.orm.entity_manager'
            - '%my_service.config%'

<?php

namespace App\Services;

use Doctrine\ORM\EntityManagerInterface;

class MyService
{
    private $entityManager;
    private $config;

    public function __construct(EntityManagerInterface $entityManager, $config)
    {
        $this->entityManager = $entityManager;
        $this->config = $config;
    }

    // 定义服务的方法和逻辑
    // ...
}

<?php

namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\Routing\Annotation\Route;
use App\Services\MyService;

class MyController extends AbstractController
{
    /**
     * @Route("/example", name="example")
     */
    public function example(MyService $myService)
    {
        // 使用my_service服务的方法和逻辑
        // ...

        return $this->render('example.html.twig');
    }
}