public async Task Consume(ConsumeContext <OrderSubmittedEvent> context)
{
this.CustomerName = context.Message.CustomerName;
this.CoffeeTypeRequested = context.Message.CoffeeType;
this.ToppingsRequested = string.Join(",", context.Message.Toppings);
this.Amount = CoffeePriceCalculator.Compute(context.Message.CoffeeType, context.Message.Toppings);
var sendEndpoint = await context.GetSendEndpoint(requestPaymentEndpoint);
await sendEndpoint.Send <RequestPaymentCommand>(new { this.CorrelationId, this.Amount });
this.State = "AwaitingPayment";
}
public CoffeeStateMachine()
{
var requestPaymentEndpoint = new Uri($"queue:{KebabCaseEndpointNameFormatter.Instance.SanitizeName(nameof(RequestPaymentCommand))}");
var createBaseCoffeeEndpoint = new Uri($"queue:{KebabCaseEndpointNameFormatter.Instance.SanitizeName(nameof(CreateBaseCoffeeCommand))}");
var addToppingsEndpoint = new Uri($"queue:{KebabCaseEndpointNameFormatter.Instance.SanitizeName(nameof(AddToppingsCommand))}");
Event(() => OrderSubmittedEvent, x => x.CorrelateById(context => context.Message.CorrelationId).SelectId(context => context.Message.CorrelationId));
Event(() => PaymentAcceptedEvent, x => x.CorrelateById(context => context.Message.CorrelationId));
Event(() => PaymentRefusedEvent, x => x.CorrelateById(context => context.Message.CorrelationId));
Event(() => BaseCoffeeFinishedEvent, x => x.CorrelateById(context => context.Message.CorrelationId));
Event(() => ToppingsAddedEvent, x => x.CorrelateById(context => context.Message.CorrelationId));
InstanceState(x => x.CurrentState);
Initially(When(OrderSubmittedEvent)
.Then(x =>
{
x.Instance.CustomerName = x.Data.CustomerName;
x.Instance.CoffeeTypeRequested = x.Data.CoffeeType;
x.Instance.ToppingsRequested = string.Join(",", x.Data.Toppings);
x.Instance.Amount = CoffeePriceCalculator.Compute(x.Data.CoffeeType, x.Data.Toppings);
})
.SendAsync(requestPaymentEndpoint, context => context.Init <RequestPaymentCommand>(new { context.Instance.CorrelationId, context.Instance.Amount }))
.TransitionTo(AwaitingPayment),
Ignore(PaymentAcceptedEvent));
During(AwaitingPayment,
When(PaymentAcceptedEvent)
.SendAsync(createBaseCoffeeEndpoint, context => context.Init <CreateBaseCoffeeCommand>(new { context.Instance.CorrelationId, CoffeeType = context.Instance.CoffeeTypeRequested, NoTopping = string.IsNullOrWhiteSpace(context.Instance.ToppingsRequested) }))
.TransitionTo(Paid),
When(PaymentRefusedEvent)
.SendAsync(requestPaymentEndpoint, context => context.Init <RequestPaymentCommand>(new { context.Instance.CorrelationId, context.Instance.Amount })));
During(Paid, When(BaseCoffeeFinishedEvent)
.IfElse(context => !string.IsNullOrWhiteSpace(context.Instance.ToppingsRequested), x => x
.SendAsync(addToppingsEndpoint, context => context.Init <AddToppingsCommand>(new { context.Instance.CorrelationId, Toppings = context.Instance.ToppingsRequested.Split(",").Select(t => Enum.Parse <Topping>(t)) }))
.TransitionTo(BaseCoffeeOK),
x => x.Finalize()));
During(BaseCoffeeOK, When(ToppingsAddedEvent)
.Finalize());
}
