CODEWITHSUNDEEP
symfonydependency-injection
Razvan
Razvan

Reputation: 2596

How to inject class instead of service in Symfony?

I'd like to achieve the following (without using services.yml - ideally, through some annotation mechanism if the type hinting can't do it):

class MyClass {
    private $msgService;

    public function __construct(MessageServiceInterface $msgService) {
        $this->msgService = $msgService;
    }

    public function sendMessage($text) {
        $this->msgService->send($text);
    }
}

Basically, I'd like Symfony to be able to tell that MyClass needs to be aware of dependency injection and needs to have an implementation of MessageServiceInterface injected.

I find it quite time consuming to define a service for each class that I need to use (especially if those classes are to be used only within that module, and maybe only even once).

Upvotes: 4

Views: 704

Answers (1)

Matteo
Matteo

Reputation: 39430

You can simplify the service definition and usage with the JMSDiExtraBundle. This bundle provide Advanced Dependency Injection Features for Symfony2. Especially the Annotation features you can do something like:

Marks a class as service:

<?php

use JMS\DiExtraBundle\Annotation\Service;

/**
 * @Service("some.service.id", parent="another.service.id", public=false)
 */
class Listener
{
}

This marks the parameters of a method for injection:

<?php

use JMS\DiExtraBundle\Annotation\Inject;
use JMS\DiExtraBundle\Annotation\InjectParams;
use JMS\DiExtraBundle\Annotation\Service;

/**
 * @Service
 */
class Listener
{
    /**
     * @InjectParams({
     *     "em" = @Inject("doctrine.entity_manager")
     * })
     */
    public function __construct(EntityManager $em, Session $session)
    {
        // ...
    }
}

All without any extra configuration files.

Hope this help

Upvotes: 1

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