Final dependency presentation.odp
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The document discusses dependency injection and services in Drupal 8, highlighting the problems in Drupal 7 and the benefits of using dependency injection to create more reusable, clutter-free, and testable code. It outlines the types of injections, the definition of services and the services container, and provides examples of commonly used core services and how to create services in a custom module. The goal is to promote efficient coding practices by leveraging these concepts within the Drupal framework.
![Defining the Services :
services:
example.access_checker:
class:
DrupalexampleAccessCustomAccessCheck
arguments: ['@current_user']
tags:
- { name: access_check, applies_to:
_example_access_check }
#SrijanWW | @srijan
namespace DrupalexampleAccess;
use DrupalCoreRoutingAccessAccessInterface;
use DrupalCoreSessionAccountInterface;
class CustomAccessCheck implements AccessInterface {
/**
* A custom access check.
*
* @param DrupalCoreSessionAccountInterface $account
* Run access checks for this account.
*/
public function access(AccountInterface $account) {
return $account->hasPermission('custom_permission’);
}
}](https://image.slidesharecdn.com/finaldependencypresentation-170713100030/85/Final-dependency-presentation-odp-20-320.jpg)
![This is how the EvenSubscriber Class looks like :
class ZipangSubscriber implements EventSubscriberInterface {
public function onRespond(FilterResponseEvent $event) {
$response = $event->getResponse();
$response->headers->set('X-Custom-Header', '******');
}
public static function getSubscribedEvents() {
$events[KernelEvents::RESPONSE][] = array('onRespond');
return $events;
}
}
#SrijanWW | @srijan](https://image.slidesharecdn.com/finaldependencypresentation-170713100030/85/Final-dependency-presentation-odp-29-320.jpg)
Final dependency presentation.odp
- 1. Demystifying Dependency Injection And Services In Drupal 8 Jyoti Singh | Developer| Srijan Technologies #SrijanWW | @srijan
- 2. #SrijanWW | @srijan ● Problems in Drupal 7 ● Dependency Injection ● Services and Services Container ● Drupal 8 core services and how to use them. ● Using Services in contributed module. Objective Of The Session
- 3. #SrijanWW | @srijan Why Dependency Injection
- 4. How we want our code to look like? #SrijanWW | @srijan
- 5. How we want our code to look like? #SrijanWW | @srijan
- 6. How It Actually Looks #SrijanWW | @srijan
- 8. #SrijanWW | @srijan Problems In Drupal 7!
- 9. #SrijanWW | @srijan ● No way to Reuse the code (not OVERRIDE) ● - for eg : Copy the callback entirely and replace it with your code.
- 10. #SrijanWW | @srijan How can we test something? - Create mock objects? NO. - Want a simple test class? Bootstrap Drupal first.
- 11. #SrijanWW | @srijan Lot of Cluttering Happens - Excessive use of alter hooks - preprocess for calculations - PHP in template files
- 12. #SrijanWW | @srijan Let’s take a wrong approach
- 13. #SrijanWW | @srijan Some procedural code *foo_bar knows about the user object. *node_make_me_look_cool needs a function from another module. *You need bootstrapped Drupal to use module_load_include, or at least include the file that declares it. *foo_bar assumes some default database connection.
- 14. #SrijanWW | @srijan User class uses sessions to store language
- 15. #SrijanWW | @srijan What Is Dependency Injection?
- 16. #SrijanWW | @srijan Dependency injection is an advanced software design pattern. It implements “inversion of control”, which means that reusable code calls task specific code.
- 17. #SrijanWW | @srijan What does this mean for us Drupal developers? It means we can write more efficient code by reducing the load. We only load what we need. Type Of Injections
- 18. Type Of Injections Constructor injection Setter injection property injection Setter injectionSetter injection class User { function setSessionStorage($storage) { $this->storage = $storage; } } class User { public $sessionStorage; } $user->sessionStorage = $storage; class User { function construct($storage) { $this->storage = $storage; } } #SrijanWW | @srijan
- 19. Example ! #SrijanWW | @srijan
- 20. Defining the Services : services: example.access_checker: class: DrupalexampleAccessCustomAccessCheck arguments: ['@current_user'] tags: - { name: access_check, applies_to: _example_access_check } #SrijanWW | @srijan namespace DrupalexampleAccess; use DrupalCoreRoutingAccessAccessInterface; use DrupalCoreSessionAccountInterface; class CustomAccessCheck implements AccessInterface { /** * A custom access check. * * @param DrupalCoreSessionAccountInterface $account * Run access checks for this account. */ public function access(AccountInterface $account) { return $account->hasPermission('custom_permission’); } }
- 21. What are services and services container? #SrijanWW | @srijan
- 22. Service is simply an object, usually with one instance of each service's class for each service on a site. For example, Drupal 8 sites have a service for sending email, for logging errors, for making HTTP requests, and dozens of other common tasks. #SrijanWW | @srijan
- 23. Goal : We want to write a code that is : ● Reusable ● Clutter Free ● Testeable #SrijanWW | @srijan
- 24. The less your code knows, the more reusable it is! #SrijanWW | @srijan
- 25. Core Services in Drupal 8 #SrijanWW | @srijan
- 26. Some of the commonly used services in Drupal 8 core are : ● entity.query and entity.manager – Services use to access the informationa about Drupal entities. ● config.fatory – Loads the Config information out of your Drupal site ● config.storage - Service that knows where to store variables on your site ● config.typed - Helps to store different data types in config object. ● event_dispatcher - helps to "lazy load" classes so loading code and instantiating objects only happens when the objects are actually needed. ● current_user – The service that provides data for the drupal user. #SrijanWW | @srijan
- 27. Creating Services in Custom Module #SrijanWW | @srijan
- 28. ● Create a src Folder inside the custom module. ● Create a EvenSubscriber Class inside the src Folder ● Implement the EventSubscriberInterface . ● Implement some of the basic functions of EventSubscriberInterface like onRespond() and getSubscribedEvents() ● Create a services.yml file inside the root folder of the custom module. #SrijanWW | @srijan
- 29. This is how the EvenSubscriber Class looks like : class ZipangSubscriber implements EventSubscriberInterface { public function onRespond(FilterResponseEvent $event) { $response = $event->getResponse(); $response->headers->set('X-Custom-Header', '******'); } public static function getSubscribedEvents() { $events[KernelEvents::RESPONSE][] = array('onRespond'); return $events; } } #SrijanWW | @srijan
- 30. Service Tags Tags are used to define a group of related services, or to specify some aspect of how the service behaves. Some of the tags used are : ● event_subscriber: Indicates an event subscriber service. ● access_check: Indicates a route access checking service; ● cache.bin: Indicates a cache bin service,etc #SrijanWW | @srijan