[Spring] AOP

AOP : Aspect Oriented Programming

 

AOP가 필요한 상황

- 메소드의 호출 시간을 측정하고 싶을 때

- 회원가입 시간, 회원조회 시간을 측정하고 싶을 때

- 공통 관심 사항(cross-cutting concern) vs 핵심 관심 사항(core concern)

 

 

package hello.hellospring.aop;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;

@Component
@Aspect
public class TimeTraceAop {

 @Around("execution(* hello.hellospring..*(..))")
 public Object execute(ProceedingJoinPoint joinPoint) throws Throwable {
 
 long start = System.currentTimeMillis();
 System.out.println("START: " + joinPoint.toString());
 
 try {
 return joinPoint.proceed();
 } finally {
 long finish = System.currentTimeMillis();
 long timeMs = finish - start;
 
 System.out.println("END: " + joinPoint.toString()+ " " + timeMs +
"ms");
 }
 }
}

@Aspect : 타겟 메서드를 감싸서 특정 Advice를 실행

@Around("execution(* hello.hellospring..*(..))") : 해당 경로의 메서드에 이 Aspect를 적용