gpslab / domain-event-bundle
Bundle to create the domain layer of your DDD application
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Type:symfony-bundle
Requires
- php: >=5.5.0
- doctrine/orm: ~2.4
- gpslab/domain-event: ~2.0
- symfony/dependency-injection: ~2.3|~3.0|~4.0|~5.0
- symfony/expression-language: ~2.3|~3.0|~4.0|~5.0
- symfony/http-kernel: ~2.3|~3.0|~4.0|~5.0
Requires (Dev)
- phpunit/phpunit: ^4.8.36
README
Domain event bundle
Bundle to create the domain layer of your Domain-driven design (DDD) application.
This Symfony bundle is a wrapper for gpslab/domain-event, look it for more details.
Installation
Pretty simple with Composer, run:
composer req gpslab/domain-event-bundle
Configuration
Example configuration
gpslab_domain_event: # Event bus service # Support 'listener_located', 'queue' or a custom service # As a default used 'listener_located' bus: 'listener_located' # Event queue service # Support 'pull_memory', 'subscribe_executing' or a custom service # As a default used 'pull_memory' queue: 'pull_memory' # Event listener locator # Support 'symfony', 'container', 'direct_binding' or custom service # As a default used 'symfony' locator: 'symfony' # Publish domain events post a Doctrine flush event # As a default used 'false' publish_on_flush: true
Usage
Create a domain event
use GpsLab\Domain\Event\Event class PurchaseOrderCreatedEvent implements Event { private $customer_id; private $create_at; public function __construct(CustomerId $customer_id, \DateTimeImmutable $create_at) { $this->customer_id = $customer_id; $this->create_at = $create_at; } public function customerId(): CustomerId { return $this->customer_id; } public function createAt(): \DateTimeImmutable { return $this->create_at; } }
Raise your event
use GpsLab\Domain\Event\Aggregator\AbstractAggregateEvents; final class PurchaseOrder extends AbstractAggregateEvents { private $customer_id; private $create_at; public function __construct(CustomerId $customer_id) { $this->customer_id = $customer_id; $this->create_at = new \DateTimeImmutable(); $this->raise(new PurchaseOrderCreatedEvent($customer_id, $this->create_at)); } }
Create listener
use GpsLab\Domain\Event\Event; class SendEmailOnPurchaseOrderCreated { private $mailer; public function __construct(\Swift_Mailer $mailer) { $this->mailer = $mailer; } public function onPurchaseOrderCreated(PurchaseOrderCreatedEvent $event): void { $message = $this->mailer ->createMessage() ->setTo('recipient@example.com') ->setBody(sprintf( 'Purchase order created at %s for customer #%s', $event->createAt()->format('Y-m-d'), $event->customerId() )); $this->mailer->send($message); } }
Register event listener
services: SendEmailOnPurchaseOrderCreated: arguments: [ '@mailer' ] tags: - { name: domain_event.listener, event: PurchaseOrderCreatedEvent, method: onPurchaseOrderCreated }
Publish events in listener
use GpsLab\Domain\Event\Bus\EventBus; // get event bus from DI container $bus = $this->get(EventBus::class); // do what you need to do on your Domain $purchase_order = new PurchaseOrder(new CustomerId(1)); // this will clear the list of event in your AggregateEvents so an Event is trigger only once $events = $purchase_order->pullEvents(); // You can have more than one event at a time. foreach($events as $event) { $bus->publish($event); } // You can use one method //$bus->pullAndPublish($purchase_order);
Listener method name
You do not need to specify the name of the event handler method. By default, the __invoke method is used.
use GpsLab\Domain\Event\Event; class SendEmailOnPurchaseOrderCreated { private $mailer; public function __construct(\Swift_Mailer $mailer) { $this->mailer = $mailer; } public function __invoke(PurchaseOrderCreatedEvent $event): void { $message = $this->mailer ->createMessage() ->setTo('recipient@example.com') ->setBody(sprintf( 'Purchase order created at %s for customer #%s', $event->createAt()->format('Y-m-d'), $event->customerId() )); $this->mailer->send($message); } }
Register event listener
services: SendEmailOnPurchaseOrderCreated: arguments: [ '@mailer' ] tags: - { name: domain_event.listener, event: PurchaseOrderCreatedEvent }
Event subscribers
Create subscriber
use GpsLab\Domain\Event\Event; use GpsLab\Domain\Event\Listener\Subscriber; class SendEmailOnPurchaseOrderCreated implements Subscriber { private $mailer; public function __construct(\Swift_Mailer $mailer) { $this->mailer = $mailer; } public static function subscribedEvents(): array { return [ PurchaseOrderCreatedEvent::class => ['onPurchaseOrderCreated'], ]; } public function onPurchaseOrderCreated(PurchaseOrderCreatedEvent $event): void { $message = $this->mailer ->createMessage() ->setTo('recipient@example.com') ->setBody(sprintf( 'Purchase order created at %s for customer #%s', $event->createAt()->format('Y-m-d'), $event->customerId() )); $this->mailer->send($message); } }
Register event subscriber
services: SendEmailOnPurchaseOrderCreated: arguments: [ '@mailer' ] tags: - { name: domain_event.subscriber }
Use pull Predis queue
Install Predis with Composer, run:
composer require predis/predis
Register services:
services: # Predis Predis\Client: arguments: [ '127.0.0.1' ] # Events serializer for queue GpsLab\Domain\Event\Queue\Serializer\SymfonySerializer: arguments: [ '@serializer', 'json' ] # Predis event queue GpsLab\Domain\Event\Queue\Pull\PredisPullEventQueue: arguments: - '@Predis\Client' - '@GpsLab\Domain\Event\Queue\Serializer\SymfonySerializer' - '@logger' - 'event_queue_name'
Change config for use custom queue:
gpslab_domain_event: queue: 'GpsLab\Domain\Event\Queue\Pull\PredisPullEventQueue'
And now you can use custom queue:
use GpsLab\Domain\Event\Queue\EventQueue; $container->get(EventQueue::class)->publish($domain_event);
In latter pull events from queue:
use GpsLab\Domain\Event\Queue\EventQueue; $queue = $container->get(EventQueue::class); $bus = $container->get(EventQueue::class); while ($event = $queue->pull()) { $bus->publish($event); }
Use Predis subscribe queue
Install Predis PubSub adapter with Composer, run:
composer require superbalist/php-pubsub-redis
Register services:
services: # Predis Predis\Client: arguments: [ '127.0.0.1' ] # Predis PubSub adapter Superbalist\PubSub\Redis\RedisPubSubAdapter: arguments: [ '@Predis\Client' ] # Events serializer for queue GpsLab\Domain\Event\Queue\Serializer\SymfonySerializer: arguments: [ '@serializer', 'json' ] # Predis event queue GpsLab\Domain\Event\Queue\Subscribe\PredisSubscribeEventQueue: arguments: - '@Superbalist\PubSub\Redis\RedisPubSubAdapter' - '@GpsLab\Domain\Event\Queue\Serializer\SymfonySerializer' - '@logger' - 'event_queue_name'
Change config for use custom queue:
gpslab_domain_event: queue: 'GpsLab\Domain\Event\Queue\Subscribe\PredisSubscribeEventQueue'
And now you can use custom queue:
use GpsLab\Domain\Event\Queue\EventQueue; $container->get(EventQueue::class)->publish($domain_event);
Subscribe on the queue:
use GpsLab\Domain\Event\Queue\EventQueue; $container->get(EventQueue::class)->subscribe(function (Event $event) { // do somthing });
Note
You can use subscribe handlers as a services and tag it for optimize register.
Many queues
You can use many queues for separation the flows. For example, you want to handle events of different Bounded Contexts separately from each other.
services: acme.domain.purchase_order.event.queue: class: GpsLab\Domain\Event\Queue\Pull\PredisPullEventQueue arguments: - '@Superbalist\PubSub\Redis\RedisPubSubAdapter' - '@GpsLab\Domain\Event\Queue\Serializer\SymfonySerializer' - '@logger' - 'purchase_order_event_queue' acme.domain.article_comment.event.queue: class: GpsLab\Domain\Event\Queue\Pull\PredisPullEventQueue arguments: - '@Superbalist\PubSub\Redis\RedisPubSubAdapter' - '@GpsLab\Domain\Event\Queue\Serializer\SymfonySerializer' - '@logger' - 'article_comment_event_queue'
And now you can use a different queues.
In Purchase order Bounded Contexts.
$event = new PurchaseOrderCreatedEvent( new CustomerId(1), new \DateTimeImmutable() ); $container->get('acme.domain.purchase_order.event.queue')->publish($event);
In Article comment Bounded Contexts.
$event = new ArticleCommentedEvent( new ArticleId(1), new AuthorId(1), $comment new \DateTimeImmutable() ); $container->get('acme.domain.article_comment.event.queue')->publish($event);
Note
Similarly, you can split the subscribe queues.
License
This bundle is under the MIT license. See the complete license in the file: LICENSE