로그출력AOP & 재시도AOP

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Trace {
    // 로그출력 AOP
}

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Retry {
    // 재시도 AOP
    int value() default 3;
}

 

 

@Slf4j
@Aspect
public class RetryAspect {
    @Around("@annotation(retry)")
    public Object doRetry(ProceedingJoinPoint joinPoint, Retry retry) throws Throwable {
        log.info("[retry] {} args={}", joinPoint.getSignature(), retry);
        int maxRetry = retry.value();
        Exception exceptionHolder = null;

        for (int retryCount = 1; retryCount <= maxRetry; retryCount++) {
            try {
                log.info("[retry] try count={}/{}", retryCount, maxRetry);
                return joinPoint.proceed();
            } catch (Exception e) {
                exceptionHolder = e;
            }
        }
        throw exceptionHolder;
    }
}

@Slf4j
@Aspect
public class TraceAspect {
    @Before("@annotation(hello.aop.exam.annotation.Trace)")
    public void doTrace(JoinPoint joinPoint) {
        Object[] args = joinPoint.getArgs();
        log.info("[trace] {} args={}", joinPoint.getSignature().getName(), args);
    }
}

 

 

@Repository
public class ExamRepository {
    private static int seq = 0;

    // 5번에 1번 실패하는 요청
    @Trace
    @Retry(4)
    public String save(String itemId) {
        seq++;
        if (seq%5==0) {
            throw new RuntimeException("<예외발생>");
        }
        return "ok";
    }
}

@Service
@RequiredArgsConstructor
public class ExamService {
    private final ExamRepository examRepository;

    @Trace
    public void request(String itemId) {
        examRepository.save(itemId);
    }
}

 

 

@Slf4j
@SpringBootTest
@Import({TraceAspect.class, RetryAspect.class})
public class ExamTest {
    @Autowired
    ExamService examService;

    @Test
    void test() {
        for (int i = 0; i < 5; i++) {
            log.info("client request i={}", i);
            examService.request("data" + i);
        }
    }
}