springboot利用aop实现接口异步(进度条)的全过程

目录

• 一、前言
• 二、时序图
• 三、功能演示
• 四、关键代码
• Controller
• AsyncAop
• AsyncService
• 五、源码地址
• 总结

一、前言

在项目中发现有接口（excel导入数据）处理数据需要耗时比较长的时间，是因为数据量比较大，同时数据的校验需要耗费一定时间，决定使用一种通用的方法解决这个问题。

解决方案：通过aop使接口异步处理，前端轮询另外一个接口查询进度。

目标：

1接口上一个注解即可实现接口异步（优化：可以通过header参数动态控制是否异步）

2一个方法实现进度条的更新

二、时序图

三、功能演示

四、关键代码

Controller

@EnableAsync是自已定义注解更新缓存进度asyncService.updatePercent(per);

    @EnableAsync
    @RequestMapping(value = "test", method = RequestMethod.POST)
    @ApiOperation(value = "接口测试")
    @ApiImplicitParams({
            @ApiImplicitParam(name = "num", value = "数字", required = true, dataType = "int", paramType = "query", defaultValue = "1")
    })
    public Object demo(Integer num) throws InterruptedException {
        for (int i = 0; i < 15; i++) {
            Thread.sleep(1000);
            //计算百分比
            String per = BigDecimal.valueOf(i).divide(BigDecimal.valueOf(15), 2, RoundingMode.HALF_DOWN).toString();
            //更新redis缓存进度
            asyncService.updatePercent(per);
        }
        Integer b = 100;
        return Result.success(String.format("线程变量值:%s,100除以%s的结果是%s", RequestHolder.get(), num, b / num));
    }

AsyncAop

import cn.hutool.core.util.IdUtil;
import com.asyf.demo.common.Result;
import com.asyf.demo.common.pojo.RequestHolder;
import com.asyf.demo.service.AsyncService;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

@Aspect
@Component
@Slf4j
public class AsyncAop {

    @Autowired
    private AsyncService asyncService;

    @Pointcut("@annotation(com.asyf.demo.common.aop.EnableAsync)")
    public void costTimePointCut() {
    }

    @Around("costTimePointCut()")
    public Object around(ProceedingJoinPoint point) throws Throwable {
        long beginTime = System.currentTimeMillis();
        //请求header
        ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = servletRequestAttributes.getRequest();
        RequestHolder.set(request.getHeader("dateFormat"));
        //异步消息
        String id = IdUtil.simpleUUID();
        AsyncMsg asyncMsg = new AsyncMsg();
        asyncMsg.setId(id);
        //异步返回值
        Object result = Result.success(asyncMsg);
        String requestHolder = RequestHolder.get();

        //异步执行
        asyncService.async(requestHolder, asyncMsg, point);

        //执行时长(毫秒)
        long time = System.currentTimeMillis() - beginTime;
        logCostTime(point, time);

        return result;
    }

    private void logCostTime(ProceedingJoinPoint point, long time) {
        MethodSignature signature = (MethodSignature) point.getSignature();
        String className = point.getTarget().getClass().getName();
        String methodName = signature.getName();
        log.info("class:{} method:{} 耗时:{}ms", className, methodName, time);
    }
}

AsyncService

实现异步消息的更新

异步消息的进度信息传递通过本地线程与redis实现

import cn.hutool.core.exceptions.ExceptionUtil;
import com.asyf.demo.common.aop.AsyncMsg;
import com.asyf.demo.common.pojo.AsyncHolder;
import com.asyf.demo.common.pojo.RequestHolder;
import com.asyf.demo.service.AsyncService;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

@Service
@Slf4j
public class AsyncServiceImpl implements AsyncService {

    @Autowired
    private RedisTemplate redisTemplate;

    @Override
    public void async(String requestHolder, AsyncMsg asyncMsg, ProceedingJoinPoint point) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                String id = asyncMsg.getId();
                //请求线程变量-传递请求线程参数
                RequestHolder.set(requestHolder);
                //异步消息线程变量-传送id到实际方法以便方法更新进度
                AsyncHolder.set(asyncMsg);
                //执行方法
                try {
                    redisTemplate.opsForValue().set(id, asyncMsg, 60, TimeUnit.MINUTES);
                    Object result = point.proceed();
                    asyncMsg.setResult(result);
                    asyncMsg.setStatus("0");
                    redisTemplate.opsForValue().set(id, asyncMsg, 60, TimeUnit.MINUTES);
                } catch (Throwable throwable) {
                    log.error(ExceptionUtil.stacktraceToString(throwable));
                    asyncMsg.setStatus("-1");
                    asyncMsg.setResult(throwable.getLocalizedMessage());
                    redisTemplate.opsForValue().set(id, asyncMsg, 60, TimeUnit.MINUTES);
                }
            }
        }).start();
    }

    @Override
    public void updatePercent(String per) {
        AsyncMsg asyncMsg = AsyncHolder.get();
        asyncMsg.setPercent(per);
        redisTemplate.opsForValue().set(asyncMsg.getId(), asyncMsg, 60, TimeUnit.MINUTES);
    }

}

五、源码地址

java-demo: 存储代码示例 - Gitee.com

总结

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