To those of us Drupal developers getting started with Symfony, there's a whole new set of vocabulary words we need to learn. In this SlideShare presentation, I cover a few of the key things you need to know about the new terminology in Drupal 8 including: -YAML -Composer -PSR-0 -Dependency Injection -Service Containers -Routing

1. Drupal 8 Vocab
Lesson
By: Derek DeRaps, Senior Drupal Developer

2. Development
● Drupal Support
● Custom Module Development
● Large Scale Systems Integration
● Security & Performance Expertise
Design/Theming
● Usability Testing
● Responsive Design
● Drupal Theming
● Annotated Wireframes
@Mediacurrent
We help organizations build highly impactful, elegantly designed Drupal
websites that achieve the strategic results you need.
Digital Strategy
● Content Strategy
● Content Generation
● Result Metrics
● Marketing Automation Integration

3. ● YAML
● Composer
● PSR-4
● Dependency Injection
● Service Containers
● Routing
Agenda
@Mediacurrent

4. @Mediacurrent
define:
“yammel”

5. @Mediacurrent
YAML
“Yet Another Markup Language”
“YAML Ain't a Markup Language”
Used to define .info files and other configuration
Hands-on:
Let’s create a .info file for our error_notifier module

6. @Mediacurrent
define:
Composer

7. @Mediacurrent
Composer
“Composer is a tool for dependency management in PHP. It allows you to
declare the dependent libraries your project needs and it will install them
in your project for you.”
In Drupal-speak: Does the work formerly handled by the Libraries module
(and much more).
Important links:
https://getcomposer.org/installer
http://packagist.org
Hands-on:
Let’s add the Swiftmailer library to our project.

8. @Mediacurrent
define:
PSR-4

9. @Mediacurrent
PSR-4
A standard for autoloading classes.
No more include or require statements (for the most part).
Classes’ namespaces correspond to their location on disk.
Your classes’ namespaces always start with Drupalyour_module
On disk, that looks like
docroot/modules/custom/your_module/src/YourClass.php
Class names correspond to filename
class MyClass { … } resides in MyClass.php
Hands-on
Let’s declare a namespace and use other classes in our demo.

10. @Mediacurrent
define:
Dependency
Injection

11. @Mediacurrent
Dependency Injection
“Declaratively express dependencies in the class definition rather than
instantiating them in the class itself.”
E.g., pass a Transport Interface to the Mailer class; it doesn't need to know
whether it’s using SMTP, Sendmail, NullMailer, etc.
“The less your code knows, the more reusable it is.”
(Sometimes, being ignorant is a good thing.)
DI aims to help make our code:
Clutter-free, Reusable, Testable
Awesome DrupalCon session by Kat Bailey:
https://portland2013.drupal.org/session/dependency-injection-drupal-8

12. @Mediacurrent
define:
Service
Container

13. @Mediacurrent
● Service
○ any PHP object that performs some sort of “global” task.
● Service Container (aka dependency injection container)
○ a PHP object that manages the instantiation of services (i.e. objects).
● Examples:
○ EventSubscriber (“listens” for events …”Observer” OO pattern).
● Hands-On:
○ Let’s create an EventSubscriber service to send mail on 404 errors.
This might replace logic in (D7) hook_page_delivery_callback_alter
Service Container

14. @Mediacurrent
define:
Routing

15. @Mediacurrent
Routing
Think: hook_menu (which is still available FYI).
Hands-on
Let’s declare a route and then implement its Controller.

16. Thank You!
Questions?
@Mediacurrent Mediacurrent.com
slideshare.net/mediacurrent