src/Services/Ordering/Ordering.API/Application/DomainEventHandlers/BuyerAndPaymentMethodVerified/UpdateOrderWhenBuyerAndPaymentMethodVerifiedDomainEventHandler.cs

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namespace Microsoft.eShopOnContainers.Services.Ordering.API.Application.DomainEventHandlers.BuyerAndPaymentMethodVerified;

public class UpdateOrderWhenBuyerAndPaymentMethodVerifiedDomainEventHandler
                : INotificationHandler<BuyerAndPaymentMethodVerifiedDomainEvent>
{
    private readonly IOrderRepository _orderRepository;
    private readonly ILoggerFactory _logger;

    public UpdateOrderWhenBuyerAndPaymentMethodVerifiedDomainEventHandler(
        IOrderRepository orderRepository, ILoggerFactory logger)
    {
        _orderRepository = orderRepository ?? throw new ArgumentNullException(nameof(orderRepository));
        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
    }

    // Domain Logic comment:
    // When the Buyer and Buyer's payment method have been created or verified that they existed, 
    // then we can update the original Order with the BuyerId and PaymentId (foreign keys)
    public async Task Handle(BuyerAndPaymentMethodVerifiedDomainEvent buyerPaymentMethodVerifiedEvent, CancellationToken cancellationToken)
    {
        var orderToUpdate = await _orderRepository.GetAsync(buyerPaymentMethodVerifiedEvent.OrderId);
        orderToUpdate.SetBuyerId(buyerPaymentMethodVerifiedEvent.Buyer.Id);
        orderToUpdate.SetPaymentId(buyerPaymentMethodVerifiedEvent.Payment.Id);

        _logger.CreateLogger<UpdateOrderWhenBuyerAndPaymentMethodVerifiedDomainEventHandler>()
            .LogTrace("Order with Id: {OrderId} has been successfully updated with a payment method {PaymentMethod} ({Id})",
                buyerPaymentMethodVerifiedEvent.OrderId, nameof(buyerPaymentMethodVerifiedEvent.Payment), buyerPaymentMethodVerifiedEvent.Payment.Id);
    }
}