interface ClothFactory{
    void produceCloth();
}
//代理類
class ProxyClothFactory implements ClothFactory{
    private ClothFactory factory;//用被代理類對(duì)象進(jìn)行實(shí)例化
    public ProxyClothFactory(ClothFactory factory){
        this.factory = factory;
    }
    @Override
    public void produceCloth() {
        System.out.println("代理工廠做一些準(zhǔn)備工作");
        factory.produceCloth();
        System.out.println("代理工廠做一些后續(xù)的收尾工作");
    }
}
//被代理類
class NikeClothFactory implements ClothFactory{
 
    @Override
    public void produceCloth() {
        System.out.println("Nike工廠生產(chǎn)一批運(yùn)動(dòng)服");
    }
}
public class StaticProxyTest {
    public static void main(String[] args) {
        //創(chuàng)建被代理類的對(duì)象
        NikeClothFactory nike = new NikeClothFactory();
        //創(chuàng)建代理類的對(duì)象
        ProxyClothFactory proxyClothFactory = new ProxyClothFactory(nike);
        proxyClothFactory.produceCloth();
    }

interface Human{
    String getBelief();
    void eat(String food);
}
//被代理類
class SuperMan implements Human{
    @Override
    public String getBelief() {
        return "I believe I can fly!";
    }
 
    @Override
    public void eat(String food) {
        System.out.println("我喜歡吃" + food);
    }
}
class HumanUtil{
    public void method1(){
        System.out.println("===================通用方法一===============================");
    }
    public void method2(){
        System.out.println("===================通用方法二===============================");
    }
}
/*
要想實(shí)現(xiàn)動(dòng)態(tài)代理，需要解決的問(wèn)題？
問(wèn)題一：如何根據(jù)加載到內(nèi)存中的被代理類，動(dòng)態(tài)的創(chuàng)建一個(gè)代理類及其對(duì)象。
問(wèn)題二：當(dāng)通過(guò)代理類的對(duì)象調(diào)用方法a時(shí)，如何動(dòng)態(tài)的去調(diào)用被代理類中的同名方法a。
 */
class ProxyFactory{
    //調(diào)用此方法，返回一個(gè)代理類的對(duì)象。解決問(wèn)題一
    public static Object getProxyInstance(Object obj){//obj:被代理類的對(duì)象
        MyInvocationHandler handler = new MyInvocationHandler();
        handler.bind(obj);
        return Proxy.newProxyInstance(obj.getClass().getClassLoader(),obj.getClass().getInterfaces(),handler);
    }
}
class MyInvocationHandler implements InvocationHandler{
    private Object obj;//需要使用被代理類的對(duì)象進(jìn)行賦值
    public void bind(Object obj){
        this.obj = obj;
    }
    //當(dāng)我們通過(guò)代理類的對(duì)象，調(diào)用方法a時(shí)，就會(huì)自動(dòng)的調(diào)用如下的方法：invoke()
    //將被代理類要執(zhí)行的方法a的功能就聲明在invoke()中
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
 
        HumanUtil util = new HumanUtil();
        util.method1();
        //method:即為代理類對(duì)象調(diào)用的方法，此方法也就作為了被代理類對(duì)象要調(diào)用的方法
        //obj:被代理類的對(duì)象
        Object returnValue = method.invoke(obj,args);
 
        util.method2();
        //上述方法的返回值就作為當(dāng)前類中的invoke()的返回值。
        return returnValue;
    }
}
public class ProxyTest{
    public static void main(String[] args) {
        SuperMan superMan = new SuperMan();
        Human proxyInstance = (Human) ProxyFactory.getProxyInstance(superMan);
        //當(dāng)通過(guò)代理類對(duì)象調(diào)用方法時(shí)，會(huì)自動(dòng)的調(diào)用被代理類中同名的方法
        String belief = proxyInstance.getBelief();
        System.out.println(belief);
        proxyInstance.eat("四川麻辣燙");
        System.out.println("************************************************");
        NikeClothFactory nikeClothFactory = new NikeClothFactory();
        ClothFactory proxyClothFactory = (ClothFactory) ProxyFactory.getProxyInstance(nikeClothFactory);
        proxyClothFactory.produceCloth();
    }