[英]Java thread equivalent of Python thread daemon mode
In python I can set a thread to be a daemon, meaning if parent dies, the child thread automatically dies along with it. 在python中,我可以将一个线程设置为守护程序,这意味着如果父线程死亡,则子线程会自动与其一起死亡。
Is there an equivalent in Java? Java是否有等效功能?
Currently I am starting a thread like this in Java, but the underlying child thread does not die and hang even if main thread exits 当前,我正在Java中启动这样的线程,但是即使主线程退出,底层的子线程也不会死机并挂起
executor = Executors.newSingleThreadExecutor();
executor.submit(() -> {
while (true) {
//Stopwatch stopwatch = Stopwatch.createStarted();
String threadName = Thread.currentThread().getName();
System.out.println("Hello " + threadName);
try {
Thread.sleep(1*1000);
} catch (InterruptedException e) {
break;
}
}
});
When you're interacting with bare Thread
you can use: 与裸
Thread
交互时,可以使用:
Thread thread = new Thread(new MyJob());
thread.setDaemon(true);
thread.start();
In your example, there's ExecutorService
that needs to be provided with ThreadFactory
which should do the similar job - like this: 在您的示例中,需要为
ThreadFactory
提供ExecutorService
,它应该执行类似的工作-如下所示:
Executors.newSingleThreadExecutor(new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
Thread thread = new Thread(r);
thread.setDaemon(true);
return thread;
}
});
I would also recommend using Guava
s ThreadFactoryBuilder
: 我也建议使用
Guava
的ThreadFactoryBuilder
:
Executors.newSingleThreadExecutor(
new ThreadFactoryBuilder()
.setDaemon(true)
.build()
);
It eases setting the most common thread properties and allows for chaining multiple thread factories 它简化了最常见线程属性的设置,并允许链接多个线程工厂
update 更新
As Slaw and Boris the Spider rightfully noticed - you have mentioned the behavior that would cause killing child-thread when parent-thread dies. 正如蜘蛛Slaw和Boris正确注意到的那样-您已经提到了当父线程死亡时会导致杀死子线程的行为。 There's nothing like that either in Python or Java.
在Python或Java中没有类似的东西。 Daemon threads will be killed when all other non-daemon threads exited.
当所有其他非守护程序线程退出时,守护程序线程将被杀死。
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