在Tomcat中从servlet生成线程的推荐方法是什么 [英] What is recommended way for spawning threads from a servlet in Tomcat

问题描述

可能重复一次！我使用Tomcat作为我的服务器，并想知道什么是在确定性结果的servlet中生成线程的最佳方法。我正在从servlet操作运行一些长时间运行的更新，并希望完成请求并在后台进行更新。而不是添加像RabbitMQ这样的消息中间件，我想我可以生成一个可以在后台运行并在自己的时间内完成的线程。我在其他SO线程中读到服务器终止服务器生成的线程，以便它能够很好地管理资源。

Probably a repeat! I am using Tomcat as my server and want to know what is best way to spawn threads in the servlet with deterministic outcomes. I am running some long running updates from a servlet action and would like for the request to complete and the updates to happen in the background. Instead of adding a messaging middleware like RabbitMQ, I thought I could spawn a thread that could run in the background and finish in its own time. I read in other SO threads that the server terminates threads spawned by the server in order for it to manage resources well.

在使用Tomcat时，是否有推荐的方法来生成线程，后台作业。我也使用Spring MVC作为应用程序。

Is there a recommended way of spawning threads, background jobs when using Tomcat. I also use Spring MVC for the application.

推荐答案

您最安全的选择是使用带有最大线程数的应用程序线程池，所以任务将在必要时排队。 ExecutorService 对此非常有帮助。

Your safest bet is using an applicaton wide thread pool with a max amount of threads, so that the tasks will be queued whenever necessary. The ExecutorService is very helpful in this.

在应用程序启动或servlet初始化时，使用执行者类：

Upon application startup or servlet initialization use the Executors class:

executor = Executors.newFixedThreadPool(10); // Max 10 threads.

然后在servlet服务期间（你可以忽略你不感兴趣的情况的结果）：

Then during servlet's service (you could ignore the result for the case that you aren't interested):

Future<ReturnType> result = executor.submit(new CallableTask());

最后，在应用程序关闭或servlet的销毁期间：

Finally, during application's shutdown or servlet's destroy:

executor.shutdownNow(); // Returns list of undone tasks, for the case that.

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