각 메소드의 실행 시간을 측정하려면?

StopWatch

@Override
public void register(Member member) {
    StopWatch stopWatch = new StopWatch();
    stopWatch.start();
    memberStorage.store(member);
    stopWatch.stop();
    System.out.println("stopWatch.getTotalTimeMillis() = " + stopWatch.getTotalTimeMillis());
}

메소드마다 작성하기에는 너무나 번거롭다

⇒ AOP (Aspect Oriented Programming)

설정

dependencies {
	// ...
	implementation group: 'org.springframework.boot', name: 'spring-boot-starter-aop'
}

이 버튼 눌러서 gradle를 적용하자.

@Aspect
@Component
public class ElapsedTimeMeasureAop {
//    @Around("execution(* com.kit.dorm..*(..))")
    @Around("@annotation(com.kit.dorm.annotation.ElapsedTimeLog)")
    public Object execute(ProceedingJoinPoint joinPoint) throws Throwable{
        StopWatch stopWatch = new StopWatch();
        stopWatch.start();
        try{
            Object result = joinPoint.proceed();
            return result;
        } finally {
            stopWatch.stop();
            System.out.println(joinPoint.toString() + " stopWatch.getTotalTimeMillis() = " + stopWatch.getTotalTimeMillis());
        }
    }
}

joinPoint → 비즈니스 로직

package com.kit.dorm.annotation;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface ElapsedTimeLog {}

@Around("@annotation(com.kit.dorm.annotation.ElapsedTimeLog)")

ElapsedTimeLog가 붙여 있는 메소드만 적용

개념

Bean을 Proxy 기반으로 만들어 낸다.

Advice에 따라 AOP가 실행되는 위치가 달라진다.

Weaving을 통해 타겟을 가져온다

  1. JDK Dynamic Proxy
  2. CGLIB Proxy