java注解使用

package com.casstime.ec.cloud.cart.infrastructure.aspect;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;

import com.casstime.commons.service.exception.HttpMessageException;
import com.casstime.commons.utils.JsonUtil;

import lombok.extern.log4j.Log4j2;

/**
 * 监控配置
 */
@Aspect
@Component
@Log4j2
public class MonitoringActuator {

    /**
     * 打印含有@Log注解的方法的方法名、入参、出参、执行时长
     */
    @Around("@annotation(com.casstime.ec.cloud.cart.infrastructure.aspect.Log)")
    public Object log(ProceedingJoinPoint joinPoint) throws Throwable {

        String method = joinPoint.getSignature().getName();

        log.info("method:{}, args:{}",
                () -> method,
                () -> JsonUtil.serializer(joinPoint.getArgs()));

        long begin = System.currentTimeMillis();

        Object result = joinPoint.proceed();

        log.info("method:{}, execute times:{}, result:{}",
                () -> method,
                () -> System.currentTimeMillis() - begin,
                () -> JsonUtil.serializer(result));

        return result;
    }

    /**
     * 统一处理接口异常
     */
    @AfterThrowing(throwing = "e", pointcut = "execution(public * com.casstime..ec.cloud.cart.interfaces.facade.*.*(..))")
    public void handleException(JoinPoint joinPoint, Throwable e) {

        if (e instanceof HttpMessageException) {
            log.warn("{} error, args:{}", () -> joinPoint.getSignature().getName(), () -> JsonUtil.serializer(joinPoint.getArgs()), () -> e);
        }
    }
}

package com.casstime.ec.cloud.cart.infrastructure.aspect;

import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

/**
 * 在方法上加上该注解, 可以打印入参、出参和方法执行时长
 */
@Retention(RUNTIME)
@Target(METHOD)
public @interface Log {

}