职责链模式- Chain of Responsibility
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职责链模式(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。将这个对象连成一条链,并沿着这条链传递请求,直到有一个对象处理它为止。
职责链模式结构图:
代码实现
Handler类,定义一个处理请求的接口
abstract class Handler
{
protected Handler successor;
//设置继任者
public void SetSuccessor(Handler successor)
{
this.successor = successor;
}
public abstract void HandlerRequest(int request);
}
ConcreHandler类,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,否则将该求转发给后继者
class ConcreteHandler1 : Handler
{
public override void HandlerRequest(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 ConcreteHandler1 : Handler
{
public override void HandlerRequest(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);
}
}
}
---客户端代码---
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 = {2,5,14,22,8,5,20};
foreach(int request in requests)
{
h1.HandleRequest(request);
}
Console.Read();
}
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