说说设计模式~装饰器模式(Decorator)~多功能消息组件的实现

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为何要设计多功能消息组件

之前写过一篇装饰器模式的文章，感觉不够深入，这次的例子是实现项目中遇到的，所以把它拿出来，再写写，之前也写过消息组件的文章，主要采用了策略模式实现的，即每个项目可以通过配置进行一种消息的订制，如，你可以订制email,sms,rtx,qq等，但不能同时采用多种机制完成消息的发送，这在一些情况下是没有问题的，但有时，我们也需要同时为客户提供多种消息的推送，这在目前还是挺现时的，如在用户下单后，同时为它发email 和短信进行通过，并对每个订单的过程进行跟踪并通知给用户，这对于用户来说，体验非常不错！

多功能消息组件的组成

1 消息元件抽象 MessageComponent

2 默认的消息实现者DefaultMessage

3 装饰器抽象 Decorator

4 实现Email消息的装饰器 EmailDecorator

5 实现SMS消息的装饰器 SMSDecorator

下面将部分核心代码公开于世

using System;

namespace test
{
    /// <summary>
    /// 消息发送元件
    /// </summary>
    public abstract class MessageComponent
    {
        public abstract void Send (string message);
    }

    /// <summary>
    /// 默认实现消息发达，可以记录日志，订阅事件，实现默认的发送消息等功能
    /// </summary>
    public class DefaultMessage:MessageComponent
    {
        public override void Send (string message)
        {
            Console.WriteLine ("默认的消息发送机制");
        }

    }

    /// <summary>
    /// 对消息发送的装饰，如加个Email发送，SMS发送等
    /// </summary>
    public abstract class Decorator:MessageComponent
    {
        private MessageComponent _messageContaion;

        public Decorator (MessageComponent messageContaion)
        {
            _messageContaion = messageContaion;
        }

        public override void Send (string message)
        {

            if (_messageContaion != null)
                _messageContaion.Send (message);
        }
    }

    /// <summary>
    /// Email消息发送装饰器
    /// </summary>
    public class EmailDecorator:Decorator
    {
        public EmailDecorator () : this (null)
        {
        }

        public EmailDecorator (MessageComponent messageContaion) : base (messageContaion)
        {
        }

        public override void Send (string message)
        {
            base.Send (message);
            Console.WriteLine ("采用Email发送消息...");
        }

    }

    /// <summary>
    /// SMS消息发送装饰器
    /// </summary>
    public class SMSDecorator:Decorator
    {
        public SMSDecorator () : this (null)
        {
        }

        public SMSDecorator (MessageComponent messageContaion) : base (messageContaion)
        {
        }

        public override void Send (string message)
        {
            base.Send (message);
            Console.WriteLine ("采用SMS发送消息...");
        }

    }
}

调用代码如下：

   　　　　　 MessageComponent defaultMessage = new DefaultMessage ();
            Decorator emailDecorator = new EmailDecorator (defaultMessage);
            Decorator smsDecorator = new SMSDecorator (emailDecorator);//把emailDecorator添加到sms后，同时它集成了defaultMessage
            smsDecorator.Send ("仓储大叔消息组件...");

结果：

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而如果只希望使用sms发送，那就是：

            Decorator smsDecorator = new SMSDecorator ();
            smsDecorator.Send ("仓储大叔消息组件...");

aaarticlea/png;base64,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" alt="" />

希望本文章可以给初学者带来收获，呵呵！

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