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OrderSaga.cs
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OrderSaga.cs
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using Core.Commands;
using Core.Events;
using Core.Ids;
using Orders.Orders.CancellingOrder;
using Orders.Orders.CompletingOrder;
using Orders.Orders.InitializingOrder;
using Orders.Orders.RecordingOrderPayment;
using Orders.Payments.DiscardingPayment;
using Orders.Payments.FinalizingPayment;
using Orders.Payments.RequestingPayment;
using Orders.Products;
using Orders.Shipments.OutOfStockProduct;
using Orders.Shipments.SendingPackage;
using Orders.ShoppingCarts.FinalizingCart;
namespace Orders.Orders;
using static OrderEvent;
public class OrderSaga(IIdGenerator idGenerator, ICommandBus commandBus):
IEventHandler<CartFinalized>,
IEventHandler<OrderInitiated>,
IEventHandler<PaymentFinalized>,
IEventHandler<OrderPaymentRecorded>,
IEventHandler<PackageWasSent>,
IEventHandler<ProductWasOutOfStock>,
IEventHandler<OrderCancelled>
{
// Happy path
public async Task Handle(CartFinalized @event, CancellationToken ct)
{
var orderId = idGenerator.New();
await commandBus.Send(
InitializeOrder.Create(orderId, @event.ClientId, @event.ProductItems, @event.TotalPrice),
ct
);
}
public async Task Handle(OrderInitiated @event, CancellationToken ct) =>
await commandBus.Send(
RequestPayment.Create(@event.OrderId, @event.TotalPrice),
ct
);
public async Task Handle(PaymentFinalized @event, CancellationToken ct) =>
await commandBus.Send(
RecordOrderPayment.Create(@event.OrderId, @event.PaymentId, @event.FinalizedAt),
ct
);
public async Task Handle(OrderPaymentRecorded @event, CancellationToken ct) =>
await commandBus.Send(
SendPackage.Create(
@event.OrderId,
@event.ProductItems.Select(pi => new ProductItem(pi.ProductId, pi.Quantity)).ToList()
),
ct
);
public async Task Handle(PackageWasSent @event, CancellationToken ct) =>
await commandBus.Send(
CompleteOrder.For(@event.OrderId),
ct
);
// Compensation
public async Task Handle(ProductWasOutOfStock @event, CancellationToken ct) =>
await commandBus.Send(
CancelOrder.Create(@event.OrderId, OrderCancellationReason.ProductWasOutOfStock),
ct
);
public async Task Handle(OrderCancelled @event, CancellationToken ct)
{
if (!@event.PaymentId.HasValue)
return;
await commandBus.Send(
DiscardPayment.Create(@event.PaymentId.Value),
ct
);
}
}