Handler with NotificationContext

7.Post.DomainNotification.CreateCustomerHandler.cs

public class CreateCustomerHandler : IRequestHandler<CreateCustomer, Guid>
{
	private readonly NotificationContext _notificationContext;
	private readonly ICustomerRepository _customerRepository;

	public CreateCustomerHandler(
		NotificationContext notificationContext,
		ICustomerRepository customerRepository)
	{
		_notificationContext = notificationContext;
		_customerRepository = customerRepository;
	}

	public async Task<Guid> Handle(CreateCustomer request, CancellationToken cancellationToken)
	{
		var customer = new Customer(request.Name, request.Email);

		if (customer.Invalid)
		{
			_notificationContext.AddNotifications(customer.ValidationResult);
			return Guid.Empty;
		}

		await _customerRepository.Save(customer);

		return customer.Id;
	}
}