inanzzz | Defining a class as a factory pattern to create and return an instance

If you want to avoid instantiating a class manually everytime you need it, you can create a factory class to do it for you behind the scene and return an instance for you to use. This method doesn't give you a chance to set constructor parameters dynamically if the class needs it.

Notification class

namespace Application\BackendBundle\Model\Notification;

class Notification
{
    private $param1;
    private $param2;
    private $title;

    public function __construct($param1, $param2)
    {
        $this->param1 = $param1;
        $this->param2 = $param2;
    }

    public function setTitle($title)
    {
        $this->title = $title . ' (' . $this->param1 . ' - ' . $this->param2 . ')';
    }

    public function getTitle()
    {
        return $this->title;
    }
}

Notification factory

namespace Application\BackendBundle\Factory;

use Application\BackendBundle\Model\Notification\Notification;

class NotificationFactory
{
    public static function createNotification($param1, $param2 = 'world')
    {
        $notification = new Notification($param1, $param2);

        return $notification;
    }
}

Factories.yml

services:
    application_backend.factory.notification:
        class:   Application\BackendBundle\Model\Notification\Notification
        factory: [Application\BackendBundle\Factory\NotificationFactory, createNotification]
        arguments:
            - hello

Controllers.yml

services:
    application_frontend.controller.default:
        class: Application\FrontendBundle\Controller\DefaultController
        arguments:
            - @application_backend.factory.notification

DefaultController.php

namespace Application\FrontendBundle\Controller;

use Application\BackendBundle\Model\Notification\Notification;

class DefaultController extends Controller
{
    private $notification;

    public function __construct(Notification $notification) {
        $this->notification = $notification;
    }

    public function indexAction()
    {
        var_dump($this->notification);
        $this->notification->setTitle('Say');
        echo $this->notification->getTitle();
        exit;
    }
}

Result