SpringSpring 고급편Decorator 패턴

Spring 핵심원리 고급편 - 구체 클래스 기반 프록시

목차

Spring 핵심원리 고급편 - 구체 클래스 기반 프록시

@Slf4j
public class ConcreteLogic {

    public String operation(){
        log.info("ConcreteLogic 실행");
        return "data";
    }
}
public class ConcreteClient {

    private ConcreteLogic concreteLogic;

    public ConcreteClient(ConcreteLogic concreteLogic) {
        this.concreteLogic = concreteLogic;
    }

    public void execute(){
        concreteLogic.operation();
    }
}
@Test
void noProxy(){
    ConcreteLogic concreteLogic = new ConcreteLogic();
    ConcreteClient client = new ConcreteClient(concreteLogic);
    client.execute();
}

구체 클래스 기반 프록시 적용

자바에서 다형성은 인터페이스를 구현하든 상위 클래스를 상속하던 상위 타입만 맞으면 다형성이 적용 된다.

@Slf4j
public class TimeProxy extends ConcreteLogic{

    private ConcreteLogic concreteLogic;

    public TimeProxy(ConcreteLogic concreteLogic) {
        this.concreteLogic = concreteLogic;
    }

    @Override
    public String operation(){
        log.info("TimeDecorator 실행");
        long startTime = System.currentTimeMillis();

        String result = concreteLogic.operation();

        long endTime = System.currentTimeMillis();
        long resultTime = endTime - startTime;
        log.info("TimeDecorator 종료 resultTime = {}ms", resultTime);
        return result;
    }
}
@Test
void addProxy(){
    ConcreteLogic concreteLogic = new ConcreteLogic();
    TimeProxy timeProxy = new TimeProxy(concreteLogic);
    ConcreteClient client = new ConcreteClient(timeProxy);
    client.execute();
}

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