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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