乐在其中设计模式(C#) - 中介者模式(Mediator Pattern)

using System;

using System.Collections.Generic;

using System.Text;



namespace Pattern.Mediator

{

    /**//// <summary>

    /// Message实体类

    /// </summary>

    public class MessageModel

    {

        /**//// <summary>

        /// 构造函数

        /// </summary>

        /// <param name="msg">Message内容</param>

        /// <param name="pt">Message发布时间</param>

        public MessageModel(string msg, DateTime pt)

        {

            this._message = msg;

            this._publishTime = pt;

        }



        private string _message;

        /**//// <summary>

        /// Message内容

        /// </summary>

        public string Message

        {

            get { return _message; }

            set { _message = value; }

        }



        private DateTime _publishTime;

        /**//// <summary>

        /// Message发布时间

        /// </summary>

        public DateTime PublishTime

        {

            get { return _publishTime; }

            set { _publishTime = value; }

        }

    }

}

using System;

using System.Collections.Generic;

using System.Text;



namespace Pattern.Mediator

{

    /**//// <summary>

    /// 抽象中介者（Mediator）

    /// </summary>

    public abstract class AbstractMessageMediator

    {

        /**//// <summary>

        /// 注册一个操作Message的对象

        /// </summary>

        /// <param name="AbstractMessage">AbstractMessage</param>

        public abstract void Register(AbstractMessage AbstractMessage);



        /**//// <summary>

        /// 发送Message

        /// </summary>

        /// <param name="from">来自UserId</param>

        /// <param name="to">发送到UserId</param>

        /// <param name="mm">Message实体对象</param>

        /// <returns></returns>

        public abstract string Send(string from, string to, MessageModel mm);

    }

}

using System;

using System.Collections.Generic;

using System.Text;



namespace Pattern.Mediator

{

    /**//// <summary>

    /// 中介者（ConcreteMediator）

    /// </summary>

    public class MessageMediator : AbstractMessageMediator

    {

        private Dictionary<string, AbstractMessage> _dictionary = new Dictionary<string, AbstractMessage>();



        /**//// <summary>

        /// 注册一个操作Message的对象

        /// </summary>

        /// <param name="abstractMessage">AbstractMessage</param>

        public override void Register(AbstractMessage abstractMessage)

        {

            if (!_dictionary.ContainsKey(abstractMessage.UserId))

            {

                _dictionary.Add(abstractMessage.UserId, abstractMessage);

            }



            abstractMessage.AbstractMessageMediator = this;

        }



        /**//// <summary>

        /// 发送Message

        /// </summary>

        /// <param name="from">来自UserId</param>

        /// <param name="to">发送到UserId</param>

        /// <param name="mm">Message实体对象</param>

        /// <returns></returns>

        public override string Send(string from, string to, MessageModel mm)

        {

            AbstractMessage abstractMessage = _dictionary[to];

            if (abstractMessage != null)

            {

                return abstractMessage.Insert(from, mm);

            }

            else

            {

                return null;

            }

        }

    }

}

using System;

using System.Collections.Generic;

using System.Text;



namespace Pattern.Mediator

{

    /**//// <summary>

    /// 操作Message抽象类（Colleague）

    /// </summary>

    public abstract class AbstractMessage

    {

        private AbstractMessageMediator _abstractMessageMediator;

        private string _userId;



        /**//// <summary>

        /// 构造函数

        /// </summary>

        /// <param name="userId">UserId</param>

        public AbstractMessage(string userId)

        {

            this._userId = userId;

        }



        /**//// <summary>

        /// UserId

        /// </summary>

        public string UserId

        {

            get { return _userId; }

        }



        /**//// <summary>

        /// 中介者

        /// </summary>

        public AbstractMessageMediator AbstractMessageMediator

        {

            get { return _abstractMessageMediator; }

            set { _abstractMessageMediator = value; }

        }



        /**//// <summary>

        /// 发送Message（由客户端调用）

        /// </summary>

        /// <param name="to">发送到UserId</param>

        /// <param name="mm">Message实体对象</param>

        /// <returns></returns>

        public string Send(string to, MessageModel mm)

        {

            return _abstractMessageMediator.Send(_userId, to, mm);

        }



        /**//// <summary>

        /// 接受Message（由中介者调用）

        /// </summary>

        /// <param name="from">来自UserId</param>

        /// <param name="mm">Message实体对象</param>

        /// <returns></returns>

        public abstract string Insert(string from, MessageModel mm);

    }

}

using System;

using System.Collections.Generic;

using System.Text;



namespace Pattern.Mediator

{

    /**//// <summary>

    /// Sql方式操作Message（ConcreteColleague）

    /// </summary>

    public class SqlMessage : AbstractMessage

    {

        /**//// <summary>

        /// 构造函数

        /// </summary>

        /// <param name="userId">UserId</param>

        public SqlMessage(string userId)

            : base(userId)

        {



        }



        /**//// <summary>

        /// 接受Message（由中介者调用）

        /// </summary>

        /// <param name="from">来自UserId</param>

        /// <param name="mm">Message实体对象</param>

        /// <returns></returns>

        public override string Insert(string from, MessageModel mm)

        {

            return "Sql方式插入Message（" + from + "发送给" + base.UserId + "）"

                + " - 内容：" + mm.Message

                + " - 时间：" + mm.PublishTime.ToString();

        }

    }

}

using System;

using System.Collections.Generic;

using System.Text;



namespace Pattern.Mediator

{

    /**//// <summary>

    /// Xml方式操作Message（ConcreteColleague）

    /// </summary>

    public class XmlMessage : AbstractMessage

    {

        /**//// <summary>

        /// 构造函数

        /// </summary>

        /// <param name="userId">UserId</param>

        public XmlMessage(string userId)

            : base(userId)

        {



        }



        /**//// <summary>

        /// 接受Message（由中介者调用）

        /// </summary>

        /// <param name="from">来自UserId</param>

        /// <param name="mm">Message实体对象</param>

        /// <returns></returns>

        public override string Insert(string from, MessageModel mm)

        {

            return "Xml方式插入Message（" + from + "发送给" + base.UserId + "）"

                + " - 内容：" + mm.Message

                + " - 时间：" + mm.PublishTime.ToString();

        }

    }

}

using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;



using Pattern.Mediator;



public partial class Mediator : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        AbstractMessageMediator messageMediator = new MessageMediator();



        AbstractMessage user1 = new SqlMessage("user1");

        AbstractMessage user2 = new SqlMessage("user2");

        AbstractMessage user3 = new XmlMessage("user3");

        AbstractMessage user4 = new XmlMessage("user4");



        messageMediator.Register(user1);

        messageMediator.Register(user2);

        messageMediator.Register(user3);

        messageMediator.Register(user4);



        Response.Write(user1.Send("user2", new MessageModel("你好！", DateTime.Now)));

        Response.Write("<br />");

        Response.Write(user2.Send("user1", new MessageModel("我不好！", DateTime.Now)));

        Response.Write("<br />");

        Response.Write(user1.Send("user2", new MessageModel("不好就不好吧。", DateTime.Now)));

        Response.Write("<br />");

        Response.Write(user3.Send("user4", new MessageModel("吃了吗？", DateTime.Now)));

        Response.Write("<br />");

        Response.Write(user4.Send("user3", new MessageModel("没吃，你请我？", DateTime.Now)));

        Response.Write("<br />");

        Response.Write(user3.Send("user4", new MessageModel("不请。", DateTime.Now)));

        Response.Write("<br />");

    }

}