[디자인 패턴] 프록시 패턴 (Proxy Pattern)

1. 소스 코드

package ch02;

public abstract class Animal {
    public abstract String getName();
}

package ch02;

// 고양이
public class Cat extends Animal {
    private String name = "고양이";

    public String getName() {
        return name;
    }
}

package ch02;

// 쥐
public class Mouse extends Animal {
    private String name = "쥐";

    public String getName() {
        return name;
    }
}

package ch02;

// SRP(Single Responsibility Principle, 단일 책임 원칙)
public class Doorman {

    public void 쫓아내(Animal animal) {
        System.out.println(animal.getName()+" 쫓아내");
    }
}

package ch02;

public class DoormanProxy {
    private Doorman doorman;

    public DoormanProxy(Doorman doorman) {
        this.doorman = doorman;
    }

    public void 쫓아내(Animal animal) {
        System.out.println("안녕");
        doorman.쫓아내(animal);
    }
}

package ch02;

// main
public class App {
    public static void main(String[] args) {
        Doorman doorman = new Doorman();

        // 의존성 주입(매개변수로 Doorman을 받는다)
        DoormanProxy doormanProxy = new DoormanProxy(doorman);

				Cat cat = new Cat();
        Mouse mouse = new Mouse();

        doormanProxy.쫓아내(cat);
        doormanProxy.쫓아내(mouse);
    }
}

2. 대리인 DoormanProxy 객체

• 매개변수로 Doorman 객체를 받습니다. (의존성)

• Doorman 대신 cat과 mouse를 쫓아냅니다.