Event-Sourcing: Conceitos e Práticas

// Exemplo simplificado usando .NET
public class OrderCreatedEvent : IEvent
{
    public Guid OrderId { get; }
    public DateTime OccurredOn { get; }

    public OrderCreatedEvent(Guid orderId)
    {
        OrderId = orderId;
        OccurredOn = DateTime.UtcNow;
    }
}

// Publicando evento
public void CreateOrder(Guid orderId)
{
    var eventStore = new EventStore();
    var @event = new OrderCreatedEvent(orderId);
    eventStore.Append(event => @event);
}

// Exemplo simplificado usando Java
import java.time.LocalDateTime;

defined class OrderCreatedEvent {
   private final String orderId;
   private final LocalDateTime occurredOn;

   public OrderCreatedEvent(String orderId) {
       this.orderId = orderId;
       this.occurredOn = LocalDateTime.now();
   }
}

// Publicando evento
public void createOrder(String orderId) {
   OrderCreatedEvent event = new OrderCreatedEvent(orderId);
   eventStore.append(event);
}