Order.cs

using System;
using MvcContrib;
using Stateless;

namespace StatelessResfulie
{
    public class Order
    {
        public enum Trigger { Self, Retrieve, Receipt, Cancel, Pay, Update }
        public enum State { IsReady, Delivered, Unpaid, Cancelled, Paid }

        private readonly StateMachine<State, RestfulieTrigger<Trigger>> _transitions;

        public int Id { get; set; }

        public Order()
        {
            _transitions = new StateMachine<State, RestfulieTrigger<Trigger>>(State.Unpaid);

            _transitions.Configure(State.Unpaid)
                .PermitReentry(Trigger.Self.At(controller => "orders", action => "show", id => Id))
                .Permit(Trigger.Cancel.At(controller => "orders", action => "cancel", id => Id), State.Cancelled)
                .Permit(Trigger.Pay.At(controller => "payments", action => "pay", id => Id), State.Paid)
                .PermitReentry(Trigger.Update.At(controller => "orders", action => "update", id => Id));

            _transitions.Configure(State.IsReady)
                .PermitReentry(Trigger.Self.At(controller => "orders", action => "show", id => Id))
                .Permit(Trigger.Retrieve.At(controller => "orders", action => "deliver", id => Id), State.Delivered)
                .PermitReentry(Trigger.Update.At(controller => "orders", action => "update", id => Id));

            _transitions.Configure(State.Delivered)
                .PermitReentry(Trigger.Self.At(controller => "orders", action => "show", id => Id))
                .PermitReentry(Trigger.Receipt.At(controller => "payments", action => "receipt", id => Id))
                .PermitReentry(Trigger.Update.At(controller => "orders", action => "update", id => Id));
        }
    }

    public class RestfulieTrigger<TTrigger>
    {
        public TTrigger Trigger { get; private set; }
        public Hash Route { get; private set; }

        internal RestfulieTrigger(TTrigger trigger, Hash route)
        {
            Trigger = trigger;
            Route = route;
        }
    }

    public static class RestfulieTriggerBuilder
    {
        public static RestfulieTrigger<TTrigger> At<TTrigger>(this TTrigger trigger, params Func<object, object>[] hash)
        {
            return new RestfulieTrigger<TTrigger>(trigger, new Hash(hash));
        }
    }
}