고급편/섹션12: 로그 출력 AOP (#21)

섹션12: 스프링 AOP - 실전 예제: 애노테이션을 활용한 AOP 예제

스프링 로드맵5 고급편/aop/src/main/java/hello/aop/exam/ExamRepository.java

@@ -1,5 +1,6 @@
 package hello.aop.exam;
 
+import hello.aop.exam.annotation.Trace;
 import org.springframework.stereotype.Repository;
 
 @Repository
@@ -11,6 +12,7 @@ public class ExamRepository {
      * 5번에 1번 실패하는 요청
      * 실패할 때 AOP로 복구하도록 설정
      */
+    @Trace
     public String save(String itemId) {
         seq++;
         if (seq % 5 == 0) {

스프링 로드맵5 고급편/aop/src/main/java/hello/aop/exam/ExamService.java

@@ -1,5 +1,6 @@
 package hello.aop.exam;
 
+import hello.aop.exam.annotation.Trace;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
@@ -9,6 +10,7 @@ public class ExamService {
 
     private final ExamRepository examRepository;
 
+    @Trace
     public void request(String itemId) {
         examRepository.save(itemId);
     }

스프링 로드맵5 고급편/aop/src/main/java/hello/aop/exam/annotation/Trace.java

@@ -0,0 +1,11 @@
+package hello.aop.exam.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Trace {
+}

스프링 로드맵5 고급편/aop/src/main/java/hello/aop/exam/aop/TraceAspect.java

@@ -0,0 +1,17 @@
+package hello.aop.exam.aop;
+
+import lombok.extern.slf4j.Slf4j;
+import org.aspectj.lang.JoinPoint;
+import org.aspectj.lang.annotation.Aspect;
+import org.aspectj.lang.annotation.Before;
+
+@Slf4j
+@Aspect
+public class TraceAspect {
+
+    @Before("@annotation(hello.aop.exam.annotation.Trace)")
+    public void doTrace(JoinPoint joinPoint) {
+        Object[] args = joinPoint.getArgs();    // 넘어가는 인수 정보들
+        log.info("[trace] {} args={}", joinPoint.getSignature(), args);
+    }
+}

스프링 로드맵5 고급편/aop/src/test/java/hello/aop/exam/ExamTest.java

@@ -1,12 +1,15 @@
 package hello.aop.exam;
 
+import hello.aop.exam.aop.TraceAspect;
 import lombok.extern.slf4j.Slf4j;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Import;
 
 @Slf4j
 @SpringBootTest
+@Import(TraceAspect.class)
 public class ExamTest {
 
     @Autowired