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class Order : Aggregate | |
{ | |
static Order() | |
{ | |
Given<Order, OrderStarted>((x, e) => | |
{ | |
x.Id = e.Id; | |
x.customerId = e.CustomerId; | |
x.status = OrderStatus.Open; | |
x.tickets = new List<Ticket>(); | |
}); | |
Given<Order, TicketsReserved>((x, e) => | |
{ | |
var ticket = new Ticket(e.TicketId, e.Quantity); | |
x.status = OrderStatus.Reserved; | |
x.tickets.Add(ticket); | |
x.outstandingBalance += e.TicketPrice * e.Quantity; | |
}); | |
Given<Order, PaymentReceived>((x, e) => | |
{ | |
x.outstandingBalance -= e.Amount; | |
x.status = OrderStatus.Closed; | |
}); | |
} | |
private Guid customerId; | |
private OrderStatus status; | |
private List<Ticket> tickets; | |
private decimal outstandingBalance; | |
public Order(Guid id, Guid customerId) | |
{ | |
Then(new OrderStarted(id, customerId)); | |
} | |
public void When(ReserveTickets command) | |
{ | |
Then(new TicketsReserved(command.TicketId, command.Quantity, 25)); | |
} | |
public void When(MakePayment command) | |
{ | |
Then(new PaymentReceived(123)); | |
} | |
} | |
struct Ticket | |
{ | |
public Ticket(Guid ticketId, int quantity) | |
{ | |
TicketId = ticketId; | |
Quantity = quantity; | |
} | |
public Guid TicketId { get; } | |
public int Quantity { get; } | |
} | |
enum OrderStatus | |
{ | |
Open, | |
Reserved, | |
Closed | |
} | |
abstract class Aggregate | |
{ | |
public Guid Id { get; protected set; } | |
protected static void Given<TAggregate, TEvent>(Action<TAggregate, TEvent> action) | |
{ | |
} | |
protected void Then<TEvent>(TEvent e) | |
{ | |
} | |
} | |
class ReserveTickets | |
{ | |
public ReserveTickets(Guid ticketId, int quantity) | |
{ | |
TicketId = ticketId; | |
Quantity = quantity; | |
} | |
public Guid TicketId { get; } | |
public int Quantity { get; } | |
} | |
class MakePayment | |
{ | |
public MakePayment(string paymentToken) | |
{ | |
PaymentToken = paymentToken; | |
} | |
public string PaymentToken { get; } | |
} | |
class OrderStarted | |
{ | |
public OrderStarted(Guid id, Guid customerId) | |
{ | |
Id = id; | |
CustomerId = customerId; | |
} | |
public Guid Id { get; } | |
public Guid CustomerId { get; } | |
} | |
class TicketsReserved | |
{ | |
public TicketsReserved(Guid ticketId, int quantity, decimal ticketPrice) | |
{ | |
TicketId = ticketId; | |
Quantity = quantity; | |
TicketPrice = ticketPrice; | |
} | |
public Guid TicketId { get; } | |
public int Quantity { get; } | |
public decimal TicketPrice { get; } | |
} | |
class PaymentReceived | |
{ | |
public PaymentReceived(decimal amount) | |
{ | |
Amount = amount; | |
} | |
public decimal Amount { get; } | |
} |
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