[AOP] AOP 포인트컷 표현식 (11) - 포인트컷에서 매개변수 전달

 

 

 

 

 

 

매개변수 전달

this, target, args, @target, @within, @annotation, @args

 

위의 포인트컷 지시자를 사용한다면 어드바이스에 매개변수를 전달할 수 있습니다.

 

 

 

 

 

다음과 같은 형태로 사용합니다.

@Before("allMember() && args(argName, ..)")
fun log(argName: String) {
    println("[log] argName = {${argName}}")
}

 

 

 

 

 

포인트컷에서의 이름과 매개변수의 이름을 맞추어야 합니다.

위의 예시에서는 argName으로 맞추었습니다.

 

 

 

추가로 타입이 메서드에 지정된 타입으로 지정됩니다.

즉 args(argName, ..)는 다음과 같이 정의되는 것입니다. 

args(String, ..)

 

 

 

 

 

 

 

 

 

 

 

 

예제 코드

@Target(CLASS)//클래스에 붙임
@Retention(RUNTIME)
annotation class ClassAop()

@Target(FUNCTION)
@Retention(RUNTIME)
annotation class MethodAop(
    val value: String
)

 

 

interface MemberService {
    fun hello(param: String): String
}

package hello.advanced.aop.member

import hello.advanced.aop.member.anno.ClassAop
import hello.advanced.aop.member.anno.MethodAop
import org.springframework.stereotype.Component


@ClassAop
@Component
class MemberServiceImpl : MemberService{

    @MethodAop("test value")
    override fun hello(param: String): String {
        return "ok"
    }

    fun internal(param: String): String {
        return "ok"
    }
}

 

 

 

 

package hello.advanced.aop.member

import hello.advanced.aop.member.anno.MethodAop

interface MemberService {
    @MethodAop("test value")
    fun hello(param: String): String
}

package hello.advanced.aop.member

import org.springframework.stereotype.Component


@Component
class MemberServiceImpl : MemberService{

    override fun hello(param: String): String {
        return "ok"
    }

    fun internal(param: String): String {
        return "ok"
    }
}

 

 

 

 

 

 

package hello.advanced.pointcut

import hello.advanced.aop.member.MemberService
import hello.advanced.aop.member.anno.ClassAop
import hello.advanced.aop.member.anno.MethodAop
import org.aspectj.lang.JoinPoint
import org.aspectj.lang.ProceedingJoinPoint
import org.aspectj.lang.annotation.Around
import org.aspectj.lang.annotation.Aspect
import org.aspectj.lang.annotation.Before
import org.aspectj.lang.annotation.Pointcut
import org.junit.jupiter.api.Test
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.boot.test.context.SpringBootTest
import org.springframework.stereotype.Component


@SpringBootTest
class ParamTest(
    @Autowired val memberService: MemberService
) {

    @Test
    fun success() {
        println("memberService Proxy=${memberService.javaClass}")
        memberService.hello("helloA")
    }
}

@Aspect
@Component
class ParameterAspect {

    @Pointcut("execution(* hello.advanced.aop.member..*.*(..))")
    fun allMember() {}

    @Around("allMember()")
    fun logArgs1(joinPoint: ProceedingJoinPoint): Any? {
        val arg = joinPoint.args[0]
        println("[logArgs1]${joinPoint.signature} ${arg}")
        return joinPoint.proceed()
    }


    @Around("allMember() && args(argName, ..) ")
    fun logArgs2(joinPoint: ProceedingJoinPoint, argName: Any): Any? {

        println("[logArgs2]${joinPoint.signature} ${argName}")
        return joinPoint.proceed()
    }

    @Before("allMember() && args(arg, ..) ")
    fun logArgs3(arg: Any) {
        println("[logArgs3] ${arg}")
    }

    @Before("allMember() && this(obj) ")
    fun thisArgs(joinPoint: JoinPoint, obj: MemberService) {//대상 클래스 타입 직접 지정 가능

        //== this는 스프링에 등록된 프록시 객체가 출력 ==//
        println("[this] ${joinPoint.signature}, obj = ${obj.javaClass}")
    }

    @Before("allMember() && target(obj) ")
    fun targetArgs(joinPoint: JoinPoint, obj: MemberService) {//대상 클래스 타입 직접 지정 가능

        //== target은 실제 대상 객체가 출력 ==//
        println("[target] ${joinPoint.signature}, obj = ${obj.javaClass}")
    }

    @Before("allMember() && @target(annotation) ")
    fun atTarget(joinPoint: JoinPoint, annotation: ClassAop) {
        println("[@target] ${joinPoint.signature}, obj = ${annotation}")
    }

    @Before("allMember() && @within(annotation) ")
    fun atWithin(joinPoint: JoinPoint, annotation: ClassAop) {
        println("[@within] ${joinPoint.signature}, obj = ${annotation}")
    }

    @Before("allMember() && @annotation(annotation) ")
    fun atAnnotation(joinPoint: JoinPoint, annotation: MethodAop) {
        //== 애노테이션의 속성값도 추출 가능 ==//
        println("[@annotation] ${joinPoint.signature}, obj = ${annotation}, annotationValue = ${annotation.value}")
    }
}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reference

https://docs.spring.io/spring-framework/docs/current/reference/html/core.html#aop-pointcuts

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