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<?php
namespace Daikon\Dbal\Projection;
use Daikon\Cqrs\Aggregate\DomainEventInterface;
use Daikon\Dbal\Exception\DbalException;
trait ProjectionTrait
{
private $state;
public static function fromArray(array $state = [])
return new self($state);
}
public function getAggregateId(): string
return $this->state['aggregateId'];
public function getAggregateRevision(): int
return $this->state['aggregateRevision'];
public function toArray(): array
return $this->state;
public function applyEvent(DomainEventInterface $domainEvent): ProjectionInterface
return $this->invokeEventHandler($domainEvent);
private function invokeEventHandler(DomainEventInterface $event): ProjectionInterface
$handlerName = preg_replace('/Event$/', '', (new \ReflectionClass($event))->getShortName());
$handlerMethod = 'when'.ucfirst($handlerName);
$handler = [$this, $handlerMethod];
if (!is_callable($handler)) {
throw new DbalException("Handler '$handlerMethod' is not callable on ".self::class);
return call_user_func($handler, $event);
private function __construct(array $state = [])
$this->state = $state;
daikon-cqrs /
dbal
