DDD~领域事件应用篇(订单处理变得更清晰)
上一讲主要说了领域事件和领域总线，这并不是一个很容易理解的文章，所以本讲实例篇主要是为了补充上一讲的理论知识，本讲实例关注的是实际中的订单处理模块，我们知道，订单处理是电子商务的核心，往往在这里面，会有很多逻辑，在开发时，给我们带来了不少的难度，如何更好的分离关注点，是本讲的主题；本讲主要是修改订单状态后，为用户发通知为例，来以此更好的说一下领域事件在实际中的作用。
前言 领域事件使用的设计模式是发布/订阅模式，或者叫观察者模式。
一 订单的几种状态，在订单进入到其中一些状态时，需要通知用户
public enum OrderStatus
{
/// <summary>
/// 表示销售订单的已创建状态 - 表明销售订单已被创建（未用）。
/// </summary>
[Description("用户下单")]
Created = ,
/// <summary>
/// 订单被用户取消
/// </summary>
[Description("取消订单")]
Canceled,
/// <summary>
/// 表示销售订单的已付款状态 - 表明客户已向销售订单付款。
/// </summary>
[Description("用户付款")]
Paid,
/// <summary>
/// 表示销售订单的已发货状态。
/// </summary>
[Description("已经发货")]
Dispatched,
/// <summary>
/// 订单已经完成
/// </summary>
[Description("订单完成")]
Finished, }
二 为需要通知的状态，创建领域事件数据源(原来在.net事件里，它一般是EventArgs对象)
/// <summary>
/// 订单已经确认事件源
/// </summary>
public class Order_Confirm_Event : Project.Events.EventBase
{
public int OrderId { get; set; }
public string UserName { get; set; }
}
/// <summary>
/// 订单已经付款事件缘
/// </summary>
public class Order_Paid_Event : Project.Events.EventBase
{
public int OrderId { get; set; }
public string UserName { get; set; }
public decimal TotalPrice { get; set; }
}
/// <summary>
/// 订单已经发货事件源
/// </summary>
public class Order_Dispatch_Event : Project.Events.EventBase
{
public int OrderId { get; set; }
public string UserName { get; set; }
}
三 为这些事件源添加事件处理方式
我们一般理解为“行为”，一种事件源可以有多种事件行为，如一个订单付款事件源，它可以同时有电子邮件行为和短信行为；反之，一个事件处理方式也可以对应多个事件源，如一个电子邮件行为，它可以同时对应订单付款
和订单发货等事件源，所以，领域事件在项目中是非常灵活的。
/// <summary>
/// 发Email的事件处理方式
/// 调用方法：EventBus.Instance.Subscribe<User_Depts_Event>(new SendEmailEventHandler())
/// EventBus.Instance.Subscribe<User_Roles_Event>(new SendEmailEventHandler())
/// </summary>
public class SendEmail_EventHandler :
IEventHandler<Order_Confirm_Event>,
IEventHandler<Order_Dispatch_Event>,
IEventHandler<Order_Paid_Event>
{
static string prefix = "本消息来自电子邮件"; #region IEventHandler<Order_Confirm_Event> 成员 public void Handle(Order_Confirm_Event evt)
{
Logger.Core.LoggerFactory.Instance.Logger_Info(string.Format("尊敬的客户{0}，你的订单已经确认，订单号{1}，请尽快付款！({2})[{3}]"
, evt.UserName
, evt.OrderId
, evt.EventDate
, prefix));
} #endregion #region IEventHandler<Order_Dispatch_Event> 成员 public void Handle(Order_Dispatch_Event evt)
{
Logger.Core.LoggerFactory.Instance.Logger_Info(string.Format("尊敬的客户{0}，你的订单已经发货，订单号{1}，请注意查收！({2})[{3}]"
, evt.UserName
, evt.OrderId
, evt.EventDate
, prefix)); } #endregion #region IEventHandler<Order_Paid_Event> 成员 public void Handle(Order_Paid_Event evt)
{
Logger.Core.LoggerFactory.Instance.Logger_Info(string.Format("尊敬的客户{0}，你的订单已经成功付款，订单号{1}，付款金额为{2}元，我们会尽快安排发货！({3})[{4}]"
, evt.UserName
, evt.OrderId
, evt.TotalPrice
, evt.EventDate
, prefix));
} #endregion
}
/// <summary>
/// 发短信的事件处理方式
/// </summary>
public class SendSMS_EventHandler :
IEventHandler<Order_Confirm_Event>,
IEventHandler<Order_Dispatch_Event>,
IEventHandler<Order_Paid_Event>
{
static string prefix = "本消息来自短信"; #region IEventHandler<Order_Confirm_Event> 成员 public void Handle(Order_Confirm_Event evt)
{
Logger.Core.LoggerFactory.Instance.Logger_Info(string.Format("尊敬的客户{0}，你的订单已经确认，订单号{1}，请尽快付款！({2})[{3}]"
, evt.UserName
, evt.OrderId
, evt.EventDate
, prefix));
} #endregion #region IEventHandler<Order_Dispatch_Event> 成员 public void Handle(Order_Dispatch_Event evt)
{
Logger.Core.LoggerFactory.Instance.Logger_Info(string.Format("尊敬的客户{0}，你的订单已经发货，订单号{1}，请注意查收！({2})[{3}]"
, evt.UserName
, evt.OrderId
, evt.EventDate
, prefix)); } #endregion #region IEventHandler<Order_Paid_Event> 成员 public void Handle(Order_Paid_Event evt)
{
Logger.Core.LoggerFactory.Instance.Logger_Info(string.Format("尊敬的客户{0}，你的订单已经成功付款，订单号{1}，付款金额为{2}元，我们会尽快安排发货！({3})[{4}]"
, evt.UserName
, evt.OrderId
, evt.TotalPrice
, evt.EventDate
, prefix));
} #endregion
}
四 订阅领域事件
我们需要有一个入口来订阅领域事件，如订阅订单确认事件，订单付款事件等，简单的做法是在global里统一注册，而标准合理的作法，我觉得应该在订单controller的静态构造方法里去注册它，因为只有用户操作订单相关模块时，才可能触
发订单这些事件！
/// <summary>
/// 类的构造方法，处理与具体实例无法的东西
/// </summary>
static OrderController()
{
#region 订阅相关领域事件 #region 订阅发email处理方式
EventBus.Instance.Subscribe<Order_Confirm_Event>(new SendEmail_EventHandler());
EventBus.Instance.Subscribe<Order_Dispatch_Event>(new SendEmail_EventHandler());
EventBus.Instance.Subscribe<Order_Paid_Event>(new SendEmail_EventHandler());
#endregion #region 订阅发短信的处理方式
EventBus.Instance.Subscribe<Order_Confirm_Event>(new SendSMS_EventHandler());
EventBus.Instance.Subscribe<Order_Dispatch_Event>(new SendSMS_EventHandler());
EventBus.Instance.Subscribe<Order_Paid_Event>(new SendSMS_EventHandler());
#endregion #endregion
}
我们看到了，每种订单事件源都被注册了电子邮件和短信两种事件处理方式，这在对应的事件被触发（发布，publish)之后，它们会被执行。
六 触发具体事件
具体的事件在具体的方法里，独立的去触发，一般它会在业务逻辑层完成
/// <summary>
/// 用户下单:create
/// </summary>
/// <param name="entity"></param>
public void DoOrder(Order_Info entity)
{
entity.OrderStatus = (int)OrderStatus.Created;
_orderRepository.Insert(entity);
entity.Order_Detail.ToList().ForEach(j => j.OrderId = entity.Id);
_orderDetailRepository.Insert(entity.Order_Detail);
EventBus.Instance.Publish(new Order_Confirm_Event { OrderId = entity.Id, UserName = entity.UserName });
} /// <summary>
/// 订单付款:paid
/// </summary>
/// <param name="entity"></param>
public void PaidOrder(Order_Info entity)
{
entity.OrderStatus = (int)OrderStatus.Paid;
_orderRepository.Update(entity);
EventBus.Instance.Publish(new Order_Paid_Event { OrderId = entity.Id, TotalPrice = entity.TotalPrice, UserName = entity.UserName });
} /// <summary>
/// 订单发货:dispatch
/// </summary>
/// <param name="entity"></param>
public void DispatchOrder(Order_Info entity)
{
entity.OrderStatus = (int)OrderStatus.Dispatched;
_orderRepository.Update(entity);
EventBus.Instance.Publish(new Order_Dispatch_Event { OrderId = entity.Id, UserName = entity.UserName });
}
八 最后，我们看一下处理处理页面和结果的截图
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" 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生成的日志
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A4ROuzATfEAsCpgWAAAMVAgAGAYiDAAEAxEGAAoBgIMABQDAQYACgGAgwAFAMBBgCKgQADAMVAgAGAYiDAAEAxEGAAoJj/AxJZzrVqq208AAAAAElFTkSuQmCC" 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生成的日志内容，类似于用户上到的电子邮件或者短信的内容
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" alt="" />
怎么样，看完这个例子相信您对领域事件有了更清晰的认识了吧，呵呵！
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