[英]How to know whether there're running tasks in ExecutorService in java?
I'd like to allow the program continue until all the tasks in ExecutorService is done. 我想让程序继续,直到ExecutorService中的所有任务完成。 And I don't want to shutdown it, I use it later.
而且我不想关闭它,我稍后再使用它。 How can I achieve this ?
我怎样才能做到这一点? Thanks
谢谢
Use ExecutorService#shutdown()
followed by ExecutorService#awaitTermination()
to make your main
thread wait for all the submitted tasks to complete before it exits. 使用
ExecutorService#shutdown()
后跟ExecutorService#awaitTermination()
使main
线程在退出之前等待所有提交的任务完成。 From the docs for 来自文档
ExecutorService#awaitTermination() ExecutorService的#awaitTermination()
Blocks until all tasks have completed execution after a shutdown request, or the timeout occurs, or the current thread is interrupted, whichever happens first.
阻止所有任务在关闭请求之后完成执行,或者发生超时,或者当前线程被中断,以先发生者为准。
An example taken directly from the ExecutorService
Javadoc: 直接从
ExecutorService
Javadoc获取的示例:
http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorService.html http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorService.html
The following method shuts down an ExecutorService in two phases, first by calling shutdown to reject incoming tasks, and then calling shutdownNow, if necessary, to cancel any lingering tasks:
以下方法分两个阶段关闭ExecutorService,首先调用shutdown以拒绝传入的任务,然后在必要时调用shutdownNow以取消任何延迟的任务:
void shutdownAndAwaitTermination(ExecutorService pool) {
pool.shutdown(); // Disable new tasks from being submitted
try {
// Wait a while for existing tasks to terminate
if (!pool.awaitTermination(60, TimeUnit.SECONDS)) {
pool.shutdownNow(); // Cancel currently executing tasks
// Wait a while for tasks to respond to being cancelled
if (!pool.awaitTermination(60, TimeUnit.SECONDS))
System.err.println("Pool did not terminate");
}
} catch (InterruptedException ie) {
// (Re-)Cancel if current thread also interrupted
pool.shutdownNow();
// Preserve interrupt status
Thread.currentThread().interrupt();
}
}
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