basster / symfony-di-extras
Some helpful DI related classes for symfony projects
Requires
- php: ^7.1.3
Requires (Dev)
- phpunit/phpunit: ^5.7
- symfony/dependency-injection: ~4.0
- symfony/event-dispatcher: ^4.3.0
- symfony/messenger: ^4.3.0
Suggests
- symfony/dependency-injection: Allows you to use the IterableServiceLocator
- symfony/event-dispatcher: Allows you to use EventDispatcherAwareInterface
- symfony/messenger: Allows you to use MessengerDispatcherAwareInterface
This package is auto-updated.
Last update: 2024-10-15 18:00:11 UTC
README
This is a collection of classes and interfaces which I reuse in many projects to help me injecting frequently used services in my own services.
Installation
Version 2 follows the simpler event dispatching approach of Symfony 4.3.
composer req basster/symfony-di-extras
Prior to Symfony 4.3, please use:
composer req basster/symfony-di-extras:^1.6
EventDispatcherAwareInterface
To inject the event-dispatcher into a service, let it implement the EventDispatcherAwareInterface. With version 3.3 Symfony introduced Interface-based service configuration, so you can utilize it, to automatically perform di-actions based in the type of class/implemented interface. Here's an example:
# app/config/services.yml or config/services.yaml (Symfony Flex)
services:
_instanceof:
Basster\SymfonyDiExtras\Event\EventDispatcherAwareInterface:
calls:
- [setEventDispatcher, ['@event_dispatcher']]
For not implementing the setEventDispatcher
method by yourself, you can use
the EventDispatcherAwareTrait which also holds a small convenience method dispatchEvent(string, Symfony\Component\EventDispatcher\Event)
Since this kind of (setter) injection makes the EventDispatcher optional on the implementing service, you make yourself dependent of the used di-container, whether the service will be injected or not. To avoid cluttering your own code with if ($this->eventDispatcher) { $this->dispatchEvent(...); }
calls, I included the NullDispatcher which follows the Null Object Pattern implementing the Symfony\Component\EventDispatcher\EventDispatcherInterface
.
I normally assign it on the constructor of the class implementing the EventDispatcherAwareInterface
.
Example:
<?php
use Basster\SymfonyDiExtras\Event\EventDispatcherAwareInterface;
use Basster\SymfonyDiExtras\Event\EventDispatcherAwareTrait;
use Basster\SymfonyDiExtras\Event\NullDispatcher;
class MyService implements EventDispatcherAwareInterface
{
use EventDispatcherAwareTrait;
public function __construct() {
$this->setEventDispatcher(new NullDispatcher());
}
}
MessageBusAware
To inject the message bus into a service, let it implement the MessageBusAwareInterface.
# app/config/services.yml or config/services.yaml (Symfony Flex)
services:
_instanceof:
Basster\SymfonyDiExtras\Event\MessageBusAware:
calls:
- [setMessageBus, ['@message_bus']]
For not implementing the setMessageBus
method by yourself, you can use
the MessageBusAwareTrait which also holds a small convenience method dispatchMessage(mixed)
Since this kind of (setter) injection makes the EventBus optional on the implementing service, you make yourself dependent of the used di-container, whether the service will be injected or not. To avoid cluttering your own code with if ($this->messageBus) { $this->messageBus->dispatch(...); }
calls, I included the NullBus which follows the Null Object Pattern implementing the Symfony\Component\Messenger\MessageBusInterface
.
I normally assign it on the constructor of the class implementing the MessageBusAware
.
Example:
<?php
use Basster\SymfonyDiExtras\Messenger\MessageBusAwareInterface;
use Basster\SymfonyDiExtras\Messenger\MessageBusAwareTrait;
use Basster\SymfonyDiExtras\Messenger\NullBus;
class MyService implements MessageBusAware
{
use EventDispatcherAwareTrait;
public function __construct() {
$this->setMessageBus(new NullBus());
}
}