messages_and_data.rs

#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
struct CustomerId(Uuid);

#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
struct OrderId(Uuid);

/// Messages sent from the "basket" service,
/// to the "order" service.
enum OrderRequest {
    /// A customer is attempting to make a new order.
    NewOrder(CustomerId),
    /// We're shutting down.
    ShutDown,
}

/// The result of making a new order, 
/// sent by the "order" service, to the "basket" service.
struct OrderResult(CustomerId, bool);

/// Messages sent from the "order" service,
/// to the "payment" service.
enum PaymentRequest {
    /// Attempt a payment for an order.
    NewOrder(OrderId),
    /// We're shutting down.
    ShutDown,
}

/// The result of making a new payment, 
/// sent by the "payment" service, to the "order" service.
struct PaymentResult(OrderId, bool);