并发编程 CompletableFuture https://www.sczyh30.com/posts/Java/java-8-completable-future/ ThreadPoolExecutor机制 https://www.todyblog.com/article?articleId=vg6df81qpqh5lrjgmisvl5p43t 开发模式 发布-订阅 https://cloud.tencent.com/developer/article/1123725