Event Dispatcher

Provides an Event Dispatcher implementation for PHP.

Installation

You can install the package via composer:

composer require ghostwriter/event-dispatcher

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Usage

Registering and dispatching an Event Listener.

use Ghostwriter\EventDispatcher\EventDispatcher;
use Ghostwriter\EventDispatcher\ListenerProvider;

// Create an event class
final class ExampleEvent
{
}

// Create an Event Listener
final class ExampleEventListener
{
    public function __invoke(ExampleEvent $event): void
    {
        // Handle the event, e.g., print the event class name
        // echo $event::class;
    }
}

// Create a ListenerProvider
$provider = ListenerProvider::new(); // or new ListenerProvider()

// Bind the Listener to the Event
$provider->bind(ExampleEvent::class, ExampleEventListener::class);

// Create an EventDispatcher
$dispatcher = EventDispatcher::new($provider); // or new EventDispatcher($provider)

// Dispatch the Event.
$event = $dispatcher->dispatch(new ExampleEvent());

// Assert the Event is the same as the dispatched Event
assert($event instanceof ExampleEvent);

Event Subscriber

Registering an Event Subscriber.

use Ghostwriter\EventDispatcher\Interface\ListenerProviderInterface;
use Ghostwriter\EventDispatcher\Interface\SubscriberInterface;
use Override;

final class EventSubscriber implements SubscriberInterface {
    /**
     * @throws Throwable
     */
    #[Override]
    public function __invoke(ListenerProviderInterface $provider): void
    {
        // InvokableListener '::__invoke'
        $provider->bind(
            TestEvent::class, 
            TestEventListener::class,
        );
    }
}

// Create a ListenerProvider
$provider = ListenerProvider::new(); // or new ListenerProvider()

// Subscribe the EventSubscriber
$provider->subscribe(EventSubscriber::class);

// Create an EventDispatcher
$dispatcher = EventDispatcher::new($provider); // or new EventDispatcher($provider)

// Dispatch the Event.
$event = $dispatcher->dispatch(new TestEvent());

// Assert the Event is the same as the dispatched Event
assert($event instanceof TestEvent);