【多线程】-- 04 静态代理模式

news2024/12/25 9:35:16

多线程

3 静态代理

这里以一个现实生活中的例子来解释并实现所谓的静态代理模式，即结婚者雇用婚庆公司来帮助自己完成整个婚礼过程：

package com.duo.lambda;

interface Marry {
    void HappyMarry();
    //人生四大乐事：久旱逢甘霖；他乡遇故知；洞房花烛夜；金榜题名时
}

//结婚主人公
class Protagonist implements Marry {
    @Override
    public void HappyMarry() {
        System.out.println("Protagonist开心地结婚了");
    }
}

//代理婚庆公司
class WeddingCompany implements Marry {
    private final Marry target;

    public WeddingCompany(Marry target) {
        this.target = target;
    }

    @Override
    public void HappyMarry() {
        before();
        this.target.HappyMarry();
        after();
    }
    
    private void before() {
        System.out.println("在结婚之前：布置婚礼现场");
    }

    private void after() {
        System.out.println("在结婚之后：收取剩余尾款");
    }
}

public class StaticProxy {
    public static void main(String[] args) {
        WeddingCompany weddingCompany = new WeddingCompany(new Protagonist());
        weddingCompany.HappyMarry();
    }
}

运行结果：

此外，代码体public class StaticProxy {}中的代码也可以写成：

public class StaticProxy {
    public static void main(String[] args) {
        Protagonist protagonist = new Protagonist();
        WeddingCompany weddingCompany = new WeddingCompany(protagonist);
        weddingCompany.HappyMarry();
    }
}

与之前所学的Thread线程进行对比，是为同理：

public class StaticProxy {
    public static void main(String[] args) {
        new Thread(() -> System.out.println("love")).start();
        new WeddingCompany(new Protagonist()).HappyMarry();
    }
}