责任链模式（Chain of Responsibility）

最新推荐文章于 2025-10-14 10:45:59 发布

原创最新推荐文章于 2025-10-14 10:45:59 发布 · 281 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#class #null #string

设计模式笔记专栏收录该内容

24 篇文章

订阅专栏

本文通过UML类图介绍了责任链模式，并提供了使用C#与Python两种语言实现的具体代码示例。责任链模式允许请求沿着处理者链传递，直到有一个处理者决定处理此请求。

UML类图

代码实现

    public abstract class Component
    {
        protected Component handler;
        public void SetHandler(Component handler)
        {
            this.handler = handler;
        }

        public abstract void Execute(int i);
    }

    public class ComponentA : Component
    {
        public override void Execute(int i)
        {
            if (i > 0)
                Console.WriteLine("i>0");
            else if (handler != null)
                handler.Execute(i);
        }
    }

    public class ComponentB : Component
    {
        public override void Execute(int i)
        {
            if (i <= 0)
                Console.WriteLine("i<=0");
            else if (handler != null)
                handler.Execute(i);
        }
    }

Python代码实现:

class Component(object):
    component=None
    def SetComponent(self, component):
        self.component=component
    def Operate(self):
        raise NotImplementedError("abstract class, you know?")

class ComponentA(Component):
    def Operate(self):
        print "this is componentA, it's running operate method now, shit!"
        if not self.component == None:
            self.component.Operate()

class ComponentB(Component):
    def Operate(self):
        print "aha, welcome to componentB, execute operate method now, fuck!"
        if not self.component == None:
            self.component.Operate()


if __name__ == "__main__":
    componentA1=ComponentA()
    componentB1=ComponentB()
    componentB2=ComponentB()
    componentA2=ComponentA()
    componentA1.SetComponent(componentB1)
    componentB1.SetComponent(componentB2)
    componentB2.SetComponent(componentA2)
    componentA1.Operate()