Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Dependency Injection in Symfony2 and Drupal
Search
Peter
August 24, 2013
Programming
0
66
Dependency Injection in Symfony2 and Drupal
My presentation for Drupal Camp Moscow 2013
Peter
August 24, 2013
Tweet
Share
More Decks by Peter
See All by Peter
Ruby microframeworks
toothfairy
3
800
Inversion of control in Symfony 2
toothfairy
3
1.3k
Other Decks in Programming
See All in Programming
プロダクト志向なエンジニアがもう一歩先の価値を目指すために意識したこと
nealle
0
120
RailsGirls IZUMO スポンサーLT
16bitidol
0
140
Hypervel - A Coroutine Framework for Laravel Artisans
albertcht
1
110
AI時代のソフトウェア開発を考える(2025/07版) / Agentic Software Engineering Findy 2025-07 Edition
twada
PRO
10
1.2k
GoのGenericsによるslice操作との付き合い方
syumai
3
720
なんとなくわかった気になるブロックテーマ入門/contents.nagoya 2025 6.28
chiilog
1
260
#kanrk08 / 公開版 PicoRubyとマイコンでの自作トレーニング計測装置を用いたワークアウトの理想と現実
bash0c7
1
670
Google Agent Development Kit でLINE Botを作ってみた
ymd65536
2
220
設計やレビューに悩んでいるPHPerに贈る、クリーンなオブジェクト設計の指針たち
panda_program
6
1.8k
VS Code Update for GitHub Copilot
74th
1
560
ruby.wasmで多人数リアルタイム通信ゲームを作ろう
lnit
2
330
PHPで始める振る舞い駆動開発(Behaviour-Driven Development)
ohmori_yusuke
2
240
Featured
See All Featured
Fantastic passwords and where to find them - at NoRuKo
philnash
51
3.3k
Writing Fast Ruby
sferik
628
62k
Speed Design
sergeychernyshev
32
1k
The Cult of Friendly URLs
andyhume
79
6.5k
Product Roadmaps are Hard
iamctodd
PRO
54
11k
Thoughts on Productivity
jonyablonski
69
4.7k
Java REST API Framework Comparison - PWX 2021
mraible
31
8.7k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
667
120k
Principles of Awesome APIs and How to Build Them.
keavy
126
17k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
30
2.1k
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
mongodb
46
9.6k
Large-scale JavaScript Application Architecture
addyosmani
512
110k
Transcript
Dependency Injection component. What where why? http://www.tv.net.ua/news/na_teleekrane/1050664487-zvezdnye-odessity-v-yetu-pyatnicu-proveryat-svoj-intellekt-v-programme-chto-gde-kogda-zvezdnye-vojny.html Petr Sergeev, EvercodeLab
About me • Web-developer since 2006 • EvercodeLab co-founder and
CTO • Ruby Php Python, over 9000 frameworks • Genius Billionaire Playboy Philanthropist
• Basics • Dependency injection • In Symfony2 • In
Drupal 8
Basics about injecting, good code and other things
Good code is good • Clean • Reusable • Clutter-free
• Testable
Bad policeman class Notifier { private $mailer; public function __construct()
{ $this->mailer = new Mailer(); } public function notify() { ... $this->mailer->send($from, $to, $msg); ... } }
Good policeman class Notifier { private $mailer; public function __construct(Mailer
$m) { $this->mailer = $m; } public function notify() { ... $this->mailer->send($from, $to, $msg); ... } } $mailer = new Mailer(); $notifier = new Notifier($mailer);
Superman class Notifier { private $mailer; public function __construct(MailerInterface $m)
{ $this->mailer = $m; } public function notify() { ... $this->mailer->send($from, $to, $msg); ... } } $mailer = new Mailer(); $notifier = new Notifier($mailer); http://www.flickr.com/photos/gkyc/with/43902217/
Injection types • Property injection • Contructor injection • Setter
injection
Property injection class Notifier { public $mailer; ... } $mailer
= new Mailer(); $notifier = new Notifier($mailer); $notifier->mailer = $mailer;
Constructor injection class Notifier { private $mailer; public function __construct(Mailer
$m) { $this->mailer = $m; } }
Setter injection class Notifier { private $mailer; public function setMailer($mailer)
{ $this->mailer = $mailer; } } $mailer = new Mailer(); $notifier = new Notifier($mailer); $notifier->setMailer($mailer);
Dependency Injection = Inversion of control http://www.flickr.com/photos/begumf/with/7916700382/
«Do not instantiate the dependencies explicitly in your class. Instead,
declaratively express dependencies in your class definition.» MSDN
How it all goes • Manual injection • Factory •
From container/injector
Dependency Injection in action
What does user do twig.extension.text: class: Twig_Extensions_Extension_Text tags: - {
name: twig.extension } app.user.validator.unique: class: App\UserBundle\Validator\UniqueValidator arguments: [@app.manager.orm_user_manager] tags: - { name: validator.constraint_validator, alias:app.user.validator.unique } app.listener.router: class: App\DefaultBundle\Listener\RouterListener tags: - { name: kernel.event_listener, event: kernel.request } arguments: [@router]
What does component do • Construct objects graph • Instantiatiate
services • Application logic and infrastructure logic are kept separately • Cache dependencies
Service Bunch of code responsible some particular global task
Separation of concerns http://www.luminescentphoto.com/blog/2011/04/27/concert-going-with-the-p7000/
To be or not to be • Database • Cache
• Mailer • Logger • Model • Controller(?)
How it works • $container->getService('some_service') • Read services graph •
Instantiate service • ... • Profit
Scopes app.form.handler.registration: class: App\UserBundle\Form\Handler\FormHandler arguments: [@fos_user.registration.form, @request] scope: request app.listener.location:
class: App\DefaultBundle\Listener\LocationListener arguments: [@request, @session, @security.context, @router] scope: request
Tags app.listener.accountNumber: class: App\UserBundle\Listener\AccountNumberListener calls: - [ setContainer, [ @service_container
] ] tags: - { name: doctrine.event_listener, event: postUpdate }
Pros and cons http://www.flickr.com/photos/jayashree-shankar/with/5180430923/
• Been loaded service cannot be redefined • Low coupling
• Type Hinting • Localization for debug and testing • Caching
• Blackbox • Hard to understand, huh?
None
Symfony 2
HttpKernel /** * Boots the current kernel. * @api */
public function boot() { // init container $this->initializeContainer(); foreach ($this->getBundles() as $bundle) { $bundle->setContainer($this->container); $bundle->boot(); } $this->booted = true; }
Symfony2 • Compiling • Tagging, event subscribers and listeners •
Bundles
$em = $this->container->get('doctrine.orm.entity_manager');
Drupal 8
Services available • Database • Module handler • Request object
2 ways of usage • Drupal::service(‘db’) • OOP style
What’s that all about
Sources list • Wikipedia • Drupal.org • Symfony.com • Katbailey.github.io
http://www.flickr.com/photos/walkn/with/3526522573/
Thanks @i_feya
[email protected]
Petr Sergeev