SpringSpring 고급편Decorator 패턴

Spring 핵심원리 고급편 - Decorator Pattern 2

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Spring 핵심원리 고급편 - Decorator Pattern 적용

@Slf4j
public class TimeDecorator implements Component{

    private Component component;

    public TimeDecorator(Component component) {
        this.component = component;
    }

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

        String result = component.operation();
        
        long endTime = System.currentTimeMillis();
        long resultTime = endTime - startTime;
        log.info("TimeDecorator 종료 resultTime = {}ms", resultTime);
        return null;
    }
}
@Test
void decorator2(){
    Component realComponent = new RealComponent();
    Component messageDecorator   = new MessageDecorator(realComponent);
    Component timeDecorator   = new TimeDecorator(messageDecorator);
    DecoratorPatternClient client = new DecoratorPatternClient(timeDecorator);
    client.execute();
}

Decoratro Pattern 은 항상 내부에 꾸며 줄 대상(Component) 가 존재해야 한다.

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