設計模式應用之工廠方法模式

2019-11-14 14:30:51

字體：大中小

來源：轉載

供稿：網友

對於http請求原理的朋友應該了解IIS上後綴映射

/*當我們請求一個*.aspx的文件時，此時會映射到System.Web.UI.PageHandlerFactory類上進行處理，而對*.ashx的請求將映射到System.Web.UI.SimpleHandlerFactory類中
（這兩個類都是繼承于IHttpHandlerFactory接口的）*/

下面用一線圖來直觀的看一下

圖引用:http://www.survivalescaperooms.com/zhili/p/FactoryMethod.html

為了更直觀的代碼DEOM我把.net部分源碼弄出來了

/*當我們請求一個*.aspx的文件時，此時會映射到System.Web.UI.PageHandlerFactory類上進行處理，而對*.ashx的請求將映射到System.Web.UI.SimpleHandlerFactory類中（這兩個類都是繼承于IHttpHandlerFactory接口的）*///抽象工廠public interface IHttpHandlerFactory{    //返回接口---->抽象產品角色    IHttpHandler GetHandler(HttpContext context, string requestType, string url, string pathTranslated);    void ReleaseHandler(IHttpHandler handler);}//具體工廠internal class SimpleHandlerFactory : IHttpHandlerFactory2, IHttpHandlerFactory{    public virtual IHttpHandler GetHandler(HttpContext context, string requestType, string virtualPath, string path)    {        return ((IHttpHandlerFactory2)this).GetHandler(context, requestType, VirtualPath.CreateNonRelative(virtualPath), path);    }    //其他方法省略掉了.....}//具體工廠public class PageHandlerFactory : IHttpHandlerFactory2, IHttpHandlerFactory{    public virtual IHttpHandler GetHandler(HttpContext context, string requestType, string virtualPath, string path)    {        return this.GetHandlerHelper(context, requestType, VirtualPath.CreateNonRelative(virtualPath), path);    }    //其他方法省略掉了.....}//抽象產品角色public interface IHttpHandler{    bool IsReusable{get;}    void PRocessRequest(HttpContext context);}//頁面aspx(具體頁面產品)public partial class SystemManager_WebsitePublishing_publishServerFileManageList : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {              }}public class Page : IHttpHandler{    }/*-------------------------------------------------------*///一般處理程序ashx(具體一般處理程序產品)public class getPublishServerQueueInfo : IHttpHandler{    public void ProcessRequest (HttpContext context) {        }    public bool IsReusable {        get {            return false;        }    }}

//沒有在場景用的小例子:

//抽象產品public interface ILight{    void TurnOn();    void TurnOff();}//具體的產品類：燈泡public class BulbLight:ILight{    public void TurnOn()    {        Console.WriteLine("BulbLight turns on.");    }    public void TurnOff()    {        Console.WriteLine("BulbLight turns off.");    }}// 具體的產品類：燈管public class TubeLight:ILight{    public void TurnOn()    {        Console.WriteLine("TubeLight turns on.");    }    public void TurnOff()    {        Console.WriteLine("TubeLight turns off.");    }    }//抽象的工廠類public interface ICreator{    ILight CreateLight();}//具體燈泡工廠public class BulbCreator:ICreator{    public ILight CreateLight()    {        return new BulbLight();    }}//具體燈管工廠public class TubeCreator:ICreator{    public ILight CreateLight()    {        return new TubeLight();    }}static void Main(string[] args){    //先給我來個燈泡    ICreator creator = new BulbCreator();    ILight light = creator.CreateLight();    light.TurnOn();    light.TurnOff();    //再來個燈管看看    creator = new TubeCreator();    light = creator.CreateLight();    light.TurnOn();    light.TurnOff();}