如何等待所有线程完成，使用ExecutorService？ [英] How to wait for all threads to finish, using ExecutorService?

问题描述

我需要一次执行一些任务4，像这样：

I need to execute some amount of tasks 4 at a time, something like this:

ExecutorService taskExecutor = Executors.newFixedThreadPool(4);
while(...) {
    taskExecutor.execute(new MyTask());
}
//...wait for completion somehow

我如何所有这些都完成后得到通知？现在我不能考虑什么比设置一些全局任务计数器，并在每个任务结束时减少它，然后监视无限循环这个计数器变为0;或获得期货和无限循环监视器isDone的所有的列表。什么是不涉及无限循环的更好的解决方案？

How can I get notified once all of them are complete? For now I can't think about anything better than setting some global task counter and decrease it at the end of every task, then monitor in infinite loop this counter to become 0; or get a list of Futures and in infinite loop monitor isDone for all of them. What are better solutions not involving infinite loops?

谢谢。

推荐答案

基本上在 ExecutorService 您呼叫 shutdown（） ，然后 awaitTermination（） ：

Basically on an ExecutorService you call shutdown() and then awaitTermination():

ExecutorService taskExecutor = Executors.newFixedThreadPool(4);
while(...) {
  taskExecutor.execute(new MyTask());
}
taskExecutor.shutdown();
try {
  taskExecutor.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS);
} catch (InterruptedException e) {
  ...
}

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