Java中的Executor和Daemon [英] Executor and Daemon in Java

问题描述

我有一个MyThread对象，当我的应用程序通过服务器加载时，我将其实例化，我将其标记为守护程序线程，然后在其上调用 start（）。只要应用程序处于活动状态，该线程就会等待队列中的信息。
我的问题/问题是：目前MyThread正在扩展Thread，因为我将它标记为守护进程，并且我读到了如何实现Runnable以及使用Executor更令人满意。所以我想问的是，如果MyThread将实现Runnable而不是扩展Thread（当然会被重命名）并且我将使用 newSingleThreadScheduledExecutor（）如何，什么或者可能在哪里，我将标记为守护进程。
我希望我没有弄乱一些条款，请原谅我，因为多线程环境的某些部分对我来说是非常新的。

I have a MyThread object which I instantiate when my app is loaded through the server, I mark it as a Daemon thread and then call start() on it. The thread is meant to sit and wait for information from a queue as long as the application is active. My problem/question is this: Currently MyThread is extending Thread because I mark it as Daemon and I read about how it's more prefferable to implement Runnable and to use Executors. So what I wanted to ask is if MyThread will implement Runnable instead of extending Thread (and of course will be renamed) and I'll use newSingleThreadScheduledExecutor() how, what or maybe where, do I mark something as Daemon. I hope I haven't made a mess of terms, please excuse me if I have as some parts of the multithreading environment are very new to me.

谢谢
Ittai

Thanks Ittai

更新：
我在我的应用程序中提到的模块是一个web-app，实际上有一些这样的线程排序和它们共同的作用是它们都是 ServletContext 作为成员出于各种原因。目前我将 Thread 扩展为 WebThread ，其中 ServletContext 为memebr和所有子类都可以利用它。如果我使用Executor和ThreadFactory切换到Runnable范例，基本上我需要有一个丑陋的 WebRunnable 混合实现 Runnable 并将 ServletContext 作为公共成员并让我的 ThreadFactory 实现 newThread（除了 newThread（Runnable arg0）之外，WebRunnable arg0）。
我不确定什么是最好的。
谢谢

Update: The module I'm referring to in my app is a web-app which has a few threads actually of this sort and what they do have in common is that they all in the ServletContext as a member for various reasons. Currently I extend Thread to WebThread which has the ServletContext as a memebr and all subclasses can utilize this. If I switch over to the Runnable paradigm with the Executor and ThreadFactory than basically I need to have an ugly hybrid of WebRunnable which implements Runnable and has the ServletContext as a public member and have my ThreadFactory implement newThread(WebRunnable arg0) in addition to newThread(Runnable arg0). I'm not sure what's best. Thanks

推荐答案

如果你正在使用预定的执行者，你可以提供 ThreadFactory 。这用于创建新线程，您可以根据需要修改这些线程（例如，使它们成为守护进程）。

If you're using a scheduled executor, you can provide a ThreadFactory. This is used to create new Threads, and you can modify these (e.g. make them daemon) as you require.

编辑：要回答您的更新，您的 ThreadFactory 只需要实现 newThread（Runnable r），因为你的 WebRunnable 是 Runnable 。所以没有真正的额外工作。

To answer your update, your ThreadFactory just needs to implement newThread(Runnable r) since your WebRunnable is a Runnable. So no real extra work.

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