1.背景

     今天测试报了个bug，订单完成时间是零时区，我感觉这是一个很简单的问题，分给新同事，后来新同事找不到原因，只能自己看了,结果不看不知道，一看看了一下午。

 2.原因

看了一下午，感觉哪里都没有问题，越看越觉得没问题，啊哈哈哈，最后突然看到Fegin调用有一点不同。

 最后经过验证@Async就是真凶，因为我们都是拿请求头的时区获取时间放入数据库，@Async会使请求头的数据消失，导致获取取不到时区。

3.解决办法

配置该类可以防止丢失

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.AsyncConfigurerSupport;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.util.concurrent.ListenableFuture;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;

import java.util.concurrent.Callable;
import java.util.concurrent.Executor;
import java.util.concurrent.Future;

/*********************************************
 * @ClassName: AsyncConfig
 *
 * @Author: Clare
 *
 * @Date: 2023/8/25 上午10:25
 *
 * @Description：
 **********************************************/
@Configuration
public class AsyncConfig extends AsyncConfigurerSupport {
    public class ContextAwareCallable<T> implements Callable<T> {
        private Callable<T> task;
        private RequestAttributes context;

        public ContextAwareCallable(Callable<T> task, RequestAttributes context) {
            this.task = task;
            this.context = context;
        }

        @Override
        public T call() throws Exception {
            if (context != null) {
                RequestContextHolder.setRequestAttributes(context);
            }
            try {
                return task.call();
            } finally {
                RequestContextHolder.resetRequestAttributes();
            }
        }
    }

    public class ContextAwarePoolExecutor extends ThreadPoolTaskExecutor {
        @Override
        public <T> Future<T> submit(Callable<T> task) {
            return super.submit(new ContextAwareCallable(task, RequestContextHolder.currentRequestAttributes()));
        }

        @Override
        public <T> ListenableFuture<T> submitListenable(Callable<T> task) {
            return super.submitListenable(new ContextAwareCallable(task, RequestContextHolder.currentRequestAttributes()));
        }
    }


    @Override
    @Bean
    public Executor getAsyncExecutor() {
        return new ContextAwarePoolExecutor();
    }
}