![Bundling Services
class BillingServiceProvider extends AbstractServiceProvider
{
// A list of services provided
protected $provides = [
‘AppServiceInvoiceService’,
];
public function register()
{
$this->getContainer()->add(...);
}
}
// Add a service provider
$container->addServiceProvider(BillingServiceProvider::class);](https://image.slidesharecdn.com/dependencyinjectionincakephp-cakefest2020-201009173432/85/Dependency-injection-in-CakePHP-27-320.jpg)
Dependency injection in CakePHP
- 2. Goals ● Understanding what dependency injection is, and a few patterns to achieve it. ● You know how CakePHP does dependency injection internally. ● You know what is coming next.
- 4. … is a technique in which an object receives other objects that it depends on. These other objects are called dependencies. In the typical "using" relationship the receiving object is called a client and the passed (that is, "injected") object is called a service. -Wikipedia
- 5. OK...
- 8. Constructors! public function __construct(StripeClient $stripe) { $this->stripe = $stripe; }
- 9. Seems simple
- 11. Factories & Locators & Registries & Containers
- 12. Factories Make one thing really well
- 13. Factories $factory = new ShapeFactory($color); $triangle = $factory->makeSided(3); $square = $factory->makeSided(4);
- 14. Locators & Registries Get or make a thing by a name
- 15. Locators & Registries $registry = new LogRegistry($config); $logger = $registry->get(‘default’);
- 16. Containers Generalized creators of things
- 19. Dependency Injection today Using helpers in your templates: echo $this->Html->link(‘Click me’); Using caching: Cache::write(‘key’, $value);
- 21. Until now CakePHP didn’t help
- 22. Coming in 4.2 Injected Application Services
- 24. Application Services Contain one or more of: ● Logic that combines and coordinates multiple models. ● Logic that combines models with remote API. ● Logic that combines several remote APIs together. ● Logic that combines remote APIs and email. ● Logic that combines other services together. ● Or a variety of other things.
- 25. CakePHP Container Coming in 4.2
- 26. Registering Services public function register( ContainerInterface $container ): ContainerInterface { $container->add(...); $container->add(...); return $container; }
- 27. Bundling Services class BillingServiceProvider extends AbstractServiceProvider { // A list of services provided protected $provides = [ ‘AppServiceInvoiceService’, ]; public function register() { $this->getContainer()->add(...); } } // Add a service provider $container->addServiceProvider(BillingServiceProvider::class);
- 28. Handling Configuration use CakeCoreServiceConfig; // Add a read-only wrapper around Configure. $container->share(ServiceConfig::class); // Add scalar values you can reference by name in definitions. $container->add(‘apiKey’, ‘abc123’);
- 29. Getting Services If defined in the container, CakePHP will inject services into: ● Controller constructors ● Command constructors Automatically based on reflection into: ● Controller actions
- 30. Controller Actions // Parameters to controllers public function upgrade(BillingService $billing) { … } // Parameters to controllers with routing parameters public function modify($id, BillingService $billing) { … }
- 33. Experimental Features Fewer backwards compatibility promises
- 35. Containers Will be the first experimental feature
- 36. Hopefully Stable in 4.3 Might be in 4.4 if we need to change
- 37. We need your help Testing and finding use cases
- 38. Thank you