解决在微服务环境下远程调用feign和异步线程存在请求数据丢失问题
目录
- 一、无异步线程得情况下feign远程调用:
- 1、登录拦截器:
- 2.问题示例图:
- 3.解决方法:
- 解决方式(高亮部分):从总线中获取request数据放入子线程中
- 二、异步情况下丢失上下文问题:
一、无异步线程得情况下feign远程调用:
1、登录拦截器:
@Component public class LoginUserInterceptor implements HandlerInterceptor { public static ThreadLocal<MemberResVo> loginUser = new ThreadLocal<>(); @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { //获取登录用户的键 MemberResVo attribute = (MemberResVo) request.getSession().getAttribute(AuthServerConstant.LONG_USER); if (attribute!=null){ loginUser.set(attribute); return true; }else { request.getSession().setAttribute("msg","请先进行登录!"); response.sendRedirect("http://auth.gulimall.com/login.html"); return false; } } }
2.问题示例图:
3.解决方法:
import feign.RequestInterceptor; import feign.RequestTemplate; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes; import javax.servlet.http.HttpServletRequest; @Configuration public class GuliFeignConfig { //fegin过滤器 @Bean("requestInterceptor") public RequestInterceptor requestInterceptor() { return new RequestInterceptor() { public void apply(RequestTemplate template) { //上下文环境保持器,拿到刚进来这个请求包含的数据,而不会因为远程数据请求头被清除 ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes(); HttpServletRequest request = attributes.getRequest();//老的请求 if (request != null) { //同步老的请求头中的数据,这里是获取cookie String cookie = request.getHeader("Cookie"); template.header("Cookie", cookie); } } }; } }
二、异步情况下丢失上下文问题:
① 在同一线程下进行远程调用,即一连串调用的情况下OrederService通过远程调用先查找adress信息,再查找cart信息,则仅需配置GuliFeignConfig就够了
② 由于采用的异步任务,所以101、102线程在自己的线程中调用登录拦截器interceptor,而其实只有在72号线程中登陆拦截器才进行放行(有请求头数据),这就导致101、102的request为null
解决方式(高亮部分):从总线中获取request数据放入子线程中
RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes()
@Service("orderService") public class OrderServiceImpl extends ServiceImpl<OrderDao, OrderEntity> implements OrderService { @Autowired MemberFeignService memberFeignService; @Autowired CartFeginService cartFeginService; @Autowired ThreadPoolExecutor executor; @Autowired WmsFeignService wmsFeignService; /** * 订单确认页返回的数据 * @return */ @Override public OrderConfirmVo confirmOrder() throws ExecutionException, InterruptedException { OrderConfirmVo confirmVo = new OrderConfirmVo(); MemberResVo memberResVo = LoginUserInterceptor.loginUser.get(); //从主线程中获得所有request数据 RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes(); CompletableFuture<Void> getAddressFuture = CompletableFuture.runAsync(() -> { //1、远程查询所有地址列表 RequestContextHolder.setRequestAttributes(requestAttributes); List<MemberAddressVo> address = memberFeignService.getAddress(memberResVo.getId()); confirmVo.setAddress(address); }, executor); //2、远程查询购物车所选的购物项,获得所有购物项数据 CompletableFuture<Void> cartFuture = CompletableFuture.runAsync(() -> { //放入子线程中request数据 RequestContextHolder.setRequestAttributes(requestAttributes); List<OrderItemVo> items = cartFeginService.getCurrentUserCartItems(); confirmVo.setItem(items); }, executor).thenRunAsync(()->{ RequestContextHolder.setRequestAttributes(requestAttributes); List<OrderItemVo> items = confirmVo.getItem(); List<Long> collect = items.stream().map(item -> item.getSkuId()).collect(Collectors.toList()); //远程调用查询是否有库存 R hasStock = wmsFeignService.getSkusHasStock(collect); //形成一个List集合,获取所有物品是否有货的情况 List<SkuStockVo> data = hasStock.getData(new TypeReference<List<SkuStockVo>>() { }); if (data!=null){ //收集起来,Map<Long,Boolean> stocks; Map<Long, Boolean> map = data.stream().collect(Collectors.toMap(SkuStockVo::getSkuId, SkuStockVo::getHasStock)); confirmVo.setStocks(map); } },executor); //feign远程调用在调用之前会调用很多拦截器,因此远程调用会丢失很多请求头 //3、查询用户积分 Integer integration = memberResVo.getIntegration(); confirmVo.setIntegration(integration); //其他数据自动计算 CompletableFuture.allOf(getAddressFuture,cartFuture).get(); return confirmVo; } }
到此这篇关于解决在微服务环境下远程调用feign和异步线程存在请求数据丢失问题的文章就介绍到这了,更多相关feign远程调用请求丢失内容请搜索我们以前的文章或继续浏览下面的相关文章希望大家以后多多支持我们!
赞 (0)