[英]Shutdown or Not Shutdown? in ExecutorService (Java8)
I am trying to understand the behaviour of the executor service relative to shutdown. 我试图了解执行程序服务相对于关闭的行为。 The documentation says that the application won't terminate unless there is a shutdown() call - but in this simple example.
文档说除非有shutdown()调用,否则应用程序不会终止 - 但在这个简单的例子中。 It exits after one minute precisely.
它精确地在一分钟后退出。 Any idea?
任何的想法?
Runnable r = new Runnable() {
@Override
public void run() {
Print.println("do nothing");
}
};
ThreadFactory TF = (Runnable run) -> new Thread(run);
ExecutorService exec = Executors.newCachedThreadPool(TF);
exec.submit(r);
returns this: 11:34:00.421 : Thread-0: do nothing BUILD SUCCESSFUL (total time: 1 minute 0 seconds) 返回:11:34:00.421:线程-0:什么都不做构建成功(总时间:1分0秒)
You are using CachedThreadPool. 您正在使用CachedThreadPool。 It keeps the thread alive for 60 secs so that next subsequent tasks do not waste time in creating new thread resource.
它使线程保持活动60秒,以便下一个后续任务不会浪费时间来创建新的线程资源。 http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Executors.html
http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Executors.html
The internal code - 内部代码 -
public static ExecutorService newCachedThreadPool() {
return new ThreadPoolExecutor(0, Integer.MAX_VALUE,
60L, TimeUnit.SECONDS,
new SynchronousQueue<Runnable>());
}
You should call shutdown() once the job is done. 作业完成后,您应该调用shutdown()。
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