java如何触发关闭Guava AbstractScheduledService？

Question

我正在使用从AbstractScheduledService继承的一些服务，这些服务由ServiceManager管理。一切正常，但是现在，有一个服务的runOneIteration花费了相当长的时间，因此，我的进程需要太长的时间才能终止（超过5秒）

还有其他从AbstractExecutionThreadService继承的服务，也有类似的问题，我可以通过

@Override
protected final void triggerShutdown() {
    if (thread != null) thread.interrupt();
}

以及在run方法中存储private volatile thread。但是，正如this issue中所述，AbstractScheduledService没有triggerShutdown

我已经考虑过让runOneIteration做更少的工作这样的替代方案，但它既丑陋又低效

我无法覆盖stopAsync，因为它是最终版本，我看不到任何其他内容<像这样的事情有没有钩子

Answer 1

你能用这个吗？你有什么理由不能自己添加触发器吗

class GuavaServer {
    public static void main(String[] args) throws InterruptedException {
        GuavaServer gs = new GuavaServer();
        Set<ForceStoppableScheduledService> services = new HashSet<>();
        ForceStoppableScheduledService ts = gs.new ForceStoppableScheduledService();
        services.add(ts);
        ServiceManager manager = new ServiceManager(services);
        manager.addListener(new Listener() {
            public void stopped() {
                System.out.println("Stopped");
            }

            public void healthy() {
                System.out.println("Health");
            }

            public void failure(Service service) {
                System.out.println("Failure");
                System.exit(1);
            }
        }, MoreExecutors.directExecutor());

        manager.startAsync(); // start all the services asynchronously
        Thread.sleep(3000);
        manager.stopAsync();
        //maybe make a manager.StopNOW()?
        for (ForceStoppableScheduledService service : services) {
            service.triggerShutdown();
        }
    }

    public class ForceStoppableScheduledService extends AbstractScheduledService {

        Thread thread;

        @Override
        protected void runOneIteration() throws Exception {
            thread = Thread.currentThread();
            try {
                System.out.println("Working");
                Thread.sleep(10000);
            } catch (InterruptedException e) {// can your long process throw InterruptedException?
                System.out.println("Thread was interrupted, Failed to complete operation");
            } finally {
                thread = null;
            }
            System.out.println("Done");
        }

        @Override
        protected Scheduler scheduler() {
            return Scheduler.newFixedRateSchedule(0, 1, TimeUnit.SECONDS);
        }

        protected void triggerShutdown() {
            if (thread != null) thread.interrupt();
        }
    }
}