Event Sourcing PHP Example 05

event-sourcing-php-05.php

<?php

#[EventSourcingAggregate] // 1
class Product
{
    #[AggregateIdentifier] // 2
    private int $productId;
    use WithAggregateVersioning; // 3

    private float $price;

    #[CommandHandler] // 4
    public static function register(RegisterProduct $command): array
    {
        return [new ProductWasRegistered($command->getProductId(), $command->getPrice())];
    }

    #[CommandHandler]
    public function changePrice(ChangePrice $command): array
    {
        return [new PriceWasChanged($this->productId, $command->getPrice())];
    }

    #[EventSourcingHandler] // 5
    public function onProductWasRegistered(ProductWasRegistered $event): void
    {
        $this->productId = $event->getProductId();
        $this->price = $event->getPrice();
    }

    #[EventSourcingHandler]
    public function onPriceWasChanged(PriceWasChanged $event): void
    {
        $this->price = $event->getPrice();
    }
}