设计模式之责任链模式(Chain of Responsibility)
2010-01-22 19:57 key_sky 阅读(215) 评论(0) 编辑 收藏 举报责任链模式(Chain of Responsibility):使多个对象都有机会处理请求,从而避免请求的发送者和接收者之间的耦合关系。将这个对象连成一个链,并沿着这条链传递该请求,直道有一个对象处理它为止。
Handle:定义一个处理请示的接口。
ConcreteHandler:具体处理者类,处理它所负责的请求,可访问它的后继者,如果可处理该请求,就处理,否则就将该请求转发给它的后继者。
Chain of Responsibility1.cs
代码
using System;
using System.Collections.Generic;
using System.Text;
//责任链模式(Chain of Responsibility):使多个对象都有机会处理请求,从而避免请求的发送者
//和接收者之间的耦合关系。将这个对象连成一个链,并沿着这条链传递该请求,直道有一个对象
//处理它为止。
//Handle:定义一个处理请示的接口。
//ConcreteHandler:具体处理者类,处理它所负责的请求,可访问它的后继者,如果可处理该请求,
//就处理,否则就将该请求转发给它的后继者。
namespace Chain_of_Responsibility
{
class Chain_of_Responsibility1
{
}
//Handler
abstract class Handler
{
protected Handler successor;
public void SetSuccessor(Handler successor)
{
this.successor = successor;
}
public abstract void HandleRequest(int request);
}
//ConcreteHandler
class ConcreteHandler1 : Handler
{
public override void HandleRequest(int request)
{
if (request >= 0 && request < 10)
{
Console.WriteLine("{0}处理请求{1}",
this.GetType().Name, request);
}
else if (successor != null)
{
successor.HandleRequest(request);
}
}
}
class ConcreteHandler2 : Handler
{
public override void HandleRequest(int request)
{
if (request >= 10 && request < 20)
{
Console.WriteLine("{0}处理请求{1}", this.GetType().Name, request);
}
else if (successor != null)
{
successor.HandleRequest(request);
}
}
}
class ConcreteHandler3 : Handler
{
public override void HandleRequest(int request)
{
if (request >= 20 && request < 30)
{
Console.WriteLine("{0}处理请求{1}", this.GetType().Name, request);
}
else if (successor != null)
{
successor.HandleRequest(request);
}
}
}
}
Program.cs
代码
using System;
using System.Collections.Generic;
using System.Text;
namespace Chain_of_Responsibility
{
class Program
{
static void Main(string[] args)
{
Handler h1 = new ConcreteHandler1();
Handler h2 = new ConcreteHandler2();
Handler h3 = new ConcreteHandler3();
h1.SetSuccessor(h2);
h2.SetSuccessor(h3);
int[] requests ={ 2, 5, 14, 22, 18, 3, 27, 20 };
foreach (int request in requests)
{
h1.HandleRequest(request);
}
Console.Read();
}
}
}
运行结果:
ConcreteHandler1处理请求2
ConcreteHandler1处理请求5
ConcreteHandler2处理请求14
ConcreteHandler3处理请求22
ConcreteHandler2处理请求18
ConcreteHandler1处理请求3
ConcreteHandler3处理请求27
ConcreteHandler3处理请求20