SpringSpring AOP포인트 컷

Spring AOP Pointcut 표현식 - @target, @within

목차

@target 과 @within

@target 은 부모 클래스의 메서드까지 Advice 를 다 적용하고, @within 은 정의된 클래스내 메서드에만 Advice 를 적용합니다.

Custon Annotation 생성

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface ClassAop {
}

Advisor 생성

@Slf4j
@Aspect
static class AtTargetAtWithinAspect {

    //@target: 인스턴스 기준으로 모든 메서드의 조인 포인트를 선정, 부모 타입의 메서드도 적용
    @Around("execution(* com.example.aop..*(..)) && @target(com.example.aop.member.annotation.ClassAop)")
    public Object atTarget(ProceedingJoinPoint joinPoint) throws Throwable {
        log.info("[@target] {}", joinPoint.getSignature());
        return joinPoint.proceed();
    }

    //@within: 선택된 클래스 내부에 있는 메서드만 조인 포인트로 선정, 부모 타입의 메서드는 적용되지 않음
    @Around("execution(* com.example.aop..*(..)) && @within(com.example.aop.member.annotation.ClassAop)")
    public Object atWithin(ProceedingJoinPoint joinPoint) throws Throwable {
        log.info("[@within] {}", joinPoint.getSignature());
        return joinPoint.proceed();
    }
}

AOP 적용 확인

@Test
void success() {
    log.info("child Proxy={}", child.getClass());
    child.childMethod(); //부모, 자식 모두 있는 메서드
    child.parentMethod(); //부모 클래스만 있는 메서드
}

static class Config {

    @Bean
    public Parent parent() {
        return new Parent();
    }
    @Bean
    public Child child() {
        return new Child();
    }
    @Bean
    public AtTargetAtWithinAspect atTargetAtWithinAspect() {
        return new AtTargetAtWithinAspect();
    }
}

static class Parent {
    public void parentMethod(){} //부모에만 있는 메서드
}

@ClassAop
static class Child extends Parent {
    public void childMethod(){}
}
2021-12-20 20:45:37.947  INFO 34481 --- [    Test worker] c.e.aop.pointcut.AtTargetAtWithinTest    : child Proxy=class com.example.aop.pointcut.AtTargetAtWithinTest$Child$$EnhancerBySpringCGLIB$$6f94df27
2021-12-20 20:45:37.951  INFO 34481 --- [    Test worker] argetAtWithinTest$AtTargetAtWithinAspect : [@target] void com.example.aop.pointcut.AtTargetAtWithinTest$Child.childMethod()
2021-12-20 20:45:37.951  INFO 34481 --- [    Test worker] argetAtWithinTest$AtTargetAtWithinAspect : [@within] void com.example.aop.pointcut.AtTargetAtWithinTest$Child.childMethod()
2021-12-20 20:45:37.955  INFO 34481 --- [    Test worker] argetAtWithinTest$AtTargetAtWithinAspect : [@target] void com.example.aop.pointcut.AtTargetAtWithinTest$Parent.parentMethod()
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