JAVA 设计模式 职责链模式

时间:2023-03-09 05:32:22
JAVA 设计模式 职责链模式

用途


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,并沿着这条链传递该请求,直到有一个对象处理它为止。
职责链模式是一种行为型模式
结构

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" alt="" />

图-职责链模式

Handler : 定义一个处理请求的接口。(可选的)实现设置后继者的方法。
abstract class Handler {

    protected Handler successor;

    public void SetSuccesssor(Handler successor) {

        this.successor = successor;

    }

    

    public abstract void HandlerRequest(int request);

}

ConcreteHandler : 处理它所负责的请求,可以访问它的后继者,如果可处理该请求,就处理之,否则就将请求转发给它的后继者。

class ConcreteHandler1 extends Handler {

    @Override

    public void HandlerRequest(int request) {

        if (request >= 0 && request < 10) {

            System.out.println("ConcreteHandler1 处理请求 " + request);

        } else if (null != successor) {

            successor.HandlerRequest(request);

        }

    }

}

class ConcreteHandler2 extends Handler {

    @Override

    public void HandlerRequest(int request) {

        if (request >= 10 && request < 20) {

            System.out.println("ConcreteHandler2 处理请求 " + request);

        } else if (null != successor) {

            successor.HandlerRequest(request);

        }

    }

}

class ConcreteHandler3 extends Handler {

    @Override

    public void HandlerRequest(int request) {

        if (request >= 20 && request < 30) {

            System.out.println("ConcreteHandler3 处理请求 " + request);

        } else if (null != successor) {

            successor.HandlerRequest(request);

        }

    }

}

Client : 需要设置一个职责链的各环节对象串联起来。

public class ChainOfResponsibilityPattern {

    public static void main(String[] args) {

        Handler h1 = new ConcreteHandler1();

        Handler h2 = new ConcreteHandler2();

        Handler h3 = new ConcreteHandler3();

        h1.SetSuccesssor(h2);

        h2.SetSuccesssor(h3);

        

        int[] requests = {2, 29, 9, 15, 4, 19};

        for (int i : requests) {

            h1.HandlerRequest(i);

        }

    }

}
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本文属于 JAVA设计模式系列

参考资料

《大话设计模式》

《HeadFirst设计模式》