乐在其中设计模式(C#) - 享元模式(Flyweight Pattern)

using System;

using System.Collections.Generic;

using System.Text;



namespace Pattern.Flyweight

{

    /**//// <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.Flyweight

{

    /**//// <summary>

    /// 操作Message抽象类（Flyweight）

    /// </summary>

    public abstract class AbstractMessage

    {

        /**//// <summary>

        /// 获取Message

        /// </summary>

        /// <returns></returns>

        public abstract List<MessageModel> Get();



        /**//// <summary>

        /// 插入Message

        /// </summary>

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

        /// <returns></returns>

        public abstract bool Insert(MessageModel mm);

    }

}

using System;

using System.Collections.Generic;

using System.Text;



namespace Pattern.Flyweight

{

    /**//// <summary>

    /// Sql方式操作Message（ConcreteFlyweight）

    /// </summary>

    public class SqlMessage : AbstractMessage

    {

        /**//// <summary>

        /// 获取Message

        /// </summary>

        /// <returns></returns>

        public override List<MessageModel> Get()

        {

            List<MessageModel> l = new List<MessageModel>();

            l.Add(new MessageModel("SQL方式获取Message", DateTime.Now));



            return l;

        }



        /**//// <summary>

        /// 插入Message

        /// </summary>

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

        /// <returns></returns>

        public override bool Insert(MessageModel mm)

        {

            // 代码略

            return true;

        }

    }

}

using System;

using System.Collections.Generic;

using System.Text;



namespace Pattern.Flyweight

{

    /**//// <summary>

    /// Xml方式操作Message（ConcreteFlyweight）

    /// </summary>

    public class XmlMessage : AbstractMessage

    {

        /**//// <summary>

        /// 获取Message

        /// </summary>

        /// <returns></returns>

        public override List<MessageModel> Get()

        {

            List<MessageModel> l = new List<MessageModel>();

            l.Add(new MessageModel("XML方式获取Message", DateTime.Now));



            return l;

        }



        /**//// <summary>

        /// 插入Message

        /// </summary>

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

        /// <returns></returns>

        public override bool Insert(MessageModel mm)

        {

            // 代码略

            return true;

        }

    }

}

using System;

using System.Collections.Generic;

using System.Text;



namespace Pattern.Flyweight

{

    /**//// <summary>

    /// Message工厂（FlyweightFactory）

    /// </summary>

    public class MessageFactory

    {

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



        /**//// <summary>

        /// 获取Message对象

        /// </summary>

        /// <param name="key">key</param>

        /// <returns></returns>

        public AbstractMessage GetMessageObject(string key)

        {

            AbstractMessage messageObject = null;



            if (_messageObjects.ContainsKey(key))

            {

                messageObject = _messageObjects[key];

            }

            else

            {

                switch (key)

                {

                    case "xml": messageObject = new SqlMessage(); break;

                    case "sql": messageObject = new XmlMessage(); break;

                }



                _messageObjects.Add(key, messageObject);

            }



            return messageObject;

        }

    }

}

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.Flyweight;



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

{

    protected void Page_Load(object sender, EventArgs e)

    {

        string[] ary = new string[] { "xml", "sql" };



        MessageFactory messageFactory = new MessageFactory();



        foreach (string key in ary)

        {

            AbstractMessage messageObject = messageFactory.GetMessageObject(key);



            Response.Write(messageObject.Insert(new MessageModel("插入", DateTime.Now)));

            Response.Write("<br />");

            Response.Write(messageObject.Get()[].PublishTime.ToString());

            Response.Write("<br />");

        }

    }

}