DI migration examples

0-initial.php

<?php
// index.php
$app->get('/{id}', function ($id) use ($app) {
	$controller = new Lal\HelloController();
	return $controller->helloId($id);
});
$app->get('/', function () use ($app) {
	$controller = new Lal\HelloController();
	return $controller->index();
});

// HelloController.php
class HelloController
{
	protected $userRepo;
	protected $view;

	public function __construct()
	{
		$this->userRepo = new UserRepository();
		$this->view = new View();
	}

	// ...
}

// UserRepository.php
class UserRepository
{
	protected $datasource;

	public function __construct()
	{
		$this->datasource = new Datasource();
	}

	// ...
}

// User.php
class User
{
	protected $userRepo;

	public function __construct()
	{
		$this->userRepo = new UserRepository();
	}

	// ...
}

1-add-di_bootstrap.php

<?php
// bootstrap.php
$app['data.path'] = __DIR__.'/data/hello.json';
$app['data.source'] = $app->share(function ($app) {
	return new Lal\Datasource($app['data.path']);
});

$app['user.factory'] = $app->protect(function () use ($app) {
	return new Lal\User($app['user.repo']);
});

$app['user.repo'] = $app->share(function ($app) {
	return new Lal\UserRepository($app['data.source'], $app['user.factory']);
});

$app['view.templates'] = __DIR__.'/templates/';
$app['view.renderer'] = function ($app) {
	return new Lal\View($app['view.templates']);
};

$app['hello.controller'] = $app->share(function ($app) {
	return new Lal\HelloController($app['user.repo'], $app['view.renderer']);
});


// index.php
$app->get('/{id}', function ($id) use ($app) {
	return $app['hello.controller']->helloId($id);
});
$app->get('/', function () use ($app) {
	return $app['hello.controller']->index();
});

1-add-di_classes.php

<?php
// HelloController.php
class HelloController
{
	protected $userRepo;
	protected $view;

	public function __construct(UserRepository $userRepo, View $view)
	{
		$this->userRepo = $userRepo;
		$this->view = $view;
	}

	// ...
}

// UserRepository.php
class UserRepository
{
	protected $datasource;
	protected $userFactory;

	public function __construct(Datasource $datasource, $userFactory)
	{
		$this->datasource = $datasource;
		$this->userFactory = $userFactory;
	}

	// ...
}

// User.php
class User
{
	protected $userRepo;

	public function __construct(UserRepository $userRepo)
	{
		$this->userRepo = $userRepo;
	}
}

2-comments.php

<?php
// bootstrap.php
$app['comment.factory'] = $app->protect(function () use ($app) {
	return new Lal\Comment($app['user.repo']);
});
$app['comment.repo'] = $app->share(function ($app) {
	return new Lal\CommentRepository($app['data.source'], $app['comment.factory']);
});

$app['user.factory'] = $app->protect(function () use ($app) {
	return new Lal\User($app['user.repo'], $app['comment.repo']);
});

$app['hello.controller'] = $app->share(function ($app) {
	return new Lal\HelloController($app['user.repo'], $app['comment.repo'], $app['view.renderer']);
});

// HelloController.php
class HelloController
{
	protected $userRepo;
	protected $commentRepo;
	protected $view;

	public function __construct(UserRepository $userRepo, CommentRepository $commentRepo, View $view)
	{
		$this->userRepo = $userRepo;
		$this->commentRepo = $commentRepo;
		$this->view = $view;
	}

	// ...
}

// User.php
class User
{
	protected $userRepo;
	protected $commentRepo;

	public function __construct(UserRepository $userRepo, CommentRepository $commentRepo)
	{
		$this->userRepo = $userRepo;
		$this->commentRepo = $commentRepo;
	}
}

3-events.php

<?php
// bootstrap.php
$app['event.emitter'] = $app->share(function ($app) {
	return new Evenement\EventEmitter();
});

$app['pageview.repo'] = $app->share(function ($app) {
	return new Lal\PageViewRepository($app['data.source']);
});

$app['hello.controller'] = $app->share(function ($app) {
	$app['event.emitter']->on('user.viewed', array($app['pageview.repo'], 'incrementCount'));
	return new Lal\HelloController($app['user.repo'], $app['comment.repo'], $app['view.renderer'], $app['event.emitter']);
});

// HelloController.php
class HelloController
{
	protected $userRepo;
	protected $commentRepo;
	protected $view;
	protected $event;

	public function __construct(UserRepository $userRepo, CommentRepository $commentRepo, View $view, EventEmitter $event)
	{
		$this->userRepo = $userRepo;
		$this->commentRepo = $commentRepo;
		$this->view = $view;
		$this->event = $event;
	}

	// ...
}