关闭 ScheduledExecutorService 是否安全？

Question

我正在实现一项服务，该服务执行一些由此处模拟的长时间运行的任务Thread.sleep(10000)。当我 ctrl+c 执行时，我从未得到InterruptedException我所期望的结果。我想知道为什么。

package simple;

import my.util.Now;
import io.dropwizard.lifecycle.Managed;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class EmailSender implements Managed {

    private static final Logger LOGGER = LoggerFactory.getLogger(EmailSender.class);
    ScheduledExecutorService executorService = Executors.newScheduledThreadPool(3);

    // Constructor
    public EmailSender() {}

    @Override
    public void start() {
        LOGGER.info("Starting email sender thread: {}", Thread.currentThread().getName());
        Runnable task = () -> {
            LOGGER.info("Running: {} in thread: {}", Now.now(), Thread.currentThread().getName());
            try {
                Thread.sleep(10000);
            } catch (InterruptedException ie) {
                LOGGER.error("Task is being interrupted: {}", ie.getMessage());
            }
        };
        executorService.scheduleAtFixedRate(task, 0, 5, TimeUnit.SECONDS);
    }

    @Override
    public void stop() {
        LOGGER.info("Stopping email sender thread: {}", Thread.currentThread().getName());
        executorService.shutdown();

    }
}

假设以executorService.shutdown();这种方式等待任务执行结束是否安全？

Answer 1

shutdown不会终止当前正在运行的任务，它甚至会执行队列中等待的任务。

shutdownNow如果您想立即终止，请使用。