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ShoppingCartStateMachine.cs
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ShoppingCartStateMachine.cs
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namespace CartTracking
{
using System;
using Automatonymous;
using Shopping.Contracts;
public class ShoppingCartStateMachine :
MassTransitStateMachine<ShoppingCart>
{
public ShoppingCartStateMachine()
{
InstanceState(x => x.CurrentState);
Event(() => ItemAdded, x => x.CorrelateBy(cart => cart.UserName, context => context.Message.UserName)
.SelectId(context => Guid.NewGuid()));
Event(() => Submitted, x => x.CorrelateById(context => context.Message.CartId));
Schedule(() => CartExpired, x => x.ExpirationId, x =>
{
x.Delay = TimeSpan.FromSeconds(10);
x.Received = e => e.CorrelateById(context => context.Message.CartId);
});
Initially(
When(ItemAdded)
.Then(context =>
{
context.Instance.Created = context.Data.Timestamp;
context.Instance.Updated = context.Data.Timestamp;
context.Instance.UserName = context.Data.UserName;
})
.ThenAsync(context => Console.Out.WriteLineAsync($"Item Added: {context.Data.UserName} to {context.Instance.CorrelationId}"))
.Schedule(CartExpired, context => new CartExpiredEvent(context.Instance))
.TransitionTo(Active)
);
During(Active,
When(Submitted)
.Then(context =>
{
if (context.Data.Timestamp > context.Instance.Updated)
context.Instance.Updated = context.Data.Timestamp;
context.Instance.OrderId = context.Data.OrderId;
})
.ThenAsync(context => Console.Out.WriteLineAsync($"Cart Submitted: {context.Data.UserName} to {context.Instance.CorrelationId}"))
.Unschedule(CartExpired)
.TransitionTo(Ordered),
When(ItemAdded)
.Then(context =>
{
if (context.Data.Timestamp > context.Instance.Updated)
context.Instance.Updated = context.Data.Timestamp;
})
.ThenAsync(context => Console.Out.WriteLineAsync($"Item Added: {context.Data.UserName} to {context.Instance.CorrelationId}"))
.Schedule(CartExpired, context => new CartExpiredEvent(context.Instance)),
When(CartExpired.Received)
.ThenAsync(context => Console.Out.WriteLineAsync($"Item Expired: {context.Instance.CorrelationId}"))
.Publish(context => new CartRemovedEvent(context.Instance))
.Finalize()
);
SetCompletedWhenFinalized();
}
public State Active { get; private set; }
public State Ordered { get; private set; }
public Schedule<ShoppingCart, CartExpired> CartExpired { get; private set; }
public Event<CartItemAdded> ItemAdded { get; private set; }
public Event<OrderSubmitted> Submitted { get; private set; }
class CartExpiredEvent :
CartExpired
{
readonly ShoppingCart _instance;
public CartExpiredEvent(ShoppingCart instance)
{
_instance = instance;
}
public Guid CartId => _instance.CorrelationId;
}
class CartRemovedEvent :
CartRemoved
{
readonly ShoppingCart _instance;
public CartRemovedEvent(ShoppingCart instance)
{
_instance = instance;
}
public Guid CartId => _instance.CorrelationId;
public string UserName => _instance.UserName;
}
}
}