如何为Executors.newFixedThreadPool设置超时，并在超时时创建线程

Question

我的程序应该使用多线程运行很长时间。我需要为线程设置超时的能力，一旦线程终止，我想重新启动它。这是我的代码：

    @Test
    public void testB() throws InterruptedException {
        final ExecutorService threadPool = Executors.newFixedThreadPool(2);
        for(int i=0; i<2; i++){
            threadPool.submit(new Runnable() {
                public void run() {
                        System.out.println("thread start: " + Thread.currentThread().getName());
                    try {
                        Thread.sleep(5000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }

                }
            });
        }
        threadPool.shutdown();
        threadPool.awaitTermination(100000, TimeUnit.SECONDS);
    }

Answer 1

下面的代码将反复运行相同的任务。该池将在给定时间后关闭。

这似乎可以满足您的要求。

final ExecutorService threadPool = Executors.newFixedThreadPool(2);

for(int i = 0; i < 2; i++){
    final int taskNb = i;
    threadPool.submit(new Runnable() {
        public void run() {
            System.out.println("Thread " + taskNb + " start: " + Thread.currentThread().getName());
            try {
                Thread.sleep(5000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            // Submit same task again
            threadPool.submit(this);

        }
    });
}

// Only shutdown the pool after given amount of time
Thread.sleep(100_000_000);
threadPool.shutdown();

// Wait for running tasks to finish
threadPool.awaitTermination(5, TimeUnit.SECONDS);