如何在保持JDBC事务并行运行的同时向用户返回响应？

Question

我正在使用播放2.6。

我需要做这样的事情：

1-Receive an HTTP request
2-Start a job to insert hundreds of thousands of rows in the Database, which might take hours to complete
3-Return an HTTP response immediately after starting the job
4-Keep the job running and send an email to the user when it's finished

我找到了一些与Akka https://www.playframework.com/documentation/2.6.x/JavaAkka有关的文档，但我不知道这会是吗？我在正确的道路上吗？

Answer 1

您正在寻找Java异步：

https://www.playframework.com/documentation/2.6.x/JavaAsync#Creating-non-blocking-actions
• https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletionStage.html

Java CompletionStage类似于JavaScript Promise（结果的承诺）。因此它这样做：return promiseOfResult而不是return result以避免阻塞。

请注意，默认情况下操作是异步的：

https://www.playframework.com/documentation/2.6.x/JavaAsync#Actions-are-asynchronous-by-default