是否有代码检查计时器是否正在运行？

Question

我有一个安排计时器的游戏。我有这个CoresManager文件：

package com.rs.cores;

 import java.util.Timer;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;

 public final class CoresManager {

protected static volatile boolean shutdown;
public static WorldThread worldThread;
public static ExecutorService serverWorkerChannelExecutor;
public static ExecutorService serverBossChannelExecutor;
public static Timer fastExecutor;
public static ScheduledExecutorService slowExecutor;
public static int serverWorkersCount;

public static void init() {
    worldThread = new WorldThread();
    int availableProcessors = Runtime.getRuntime().availableProcessors();
    serverWorkersCount = availableProcessors >= 6 ? availableProcessors - (availableProcessors >= 12 ? 7 : 5) : 1;
    serverWorkerChannelExecutor = availableProcessors >= 6 ? Executors
            .newFixedThreadPool(availableProcessors - (availableProcessors >= 12 ? 7 : 5),
            new DecoderThreadFactory()) : Executors.newSingleThreadExecutor(new DecoderThreadFactory());
    serverBossChannelExecutor = Executors
            .newSingleThreadExecutor(new DecoderThreadFactory());
    fastExecutor = new Timer("Fast Executor");
    slowExecutor = availableProcessors >= 6 ? Executors.newScheduledThreadPool(availableProcessors >= 12 ? 4 : 2,
                    new SlowThreadFactory()) : Executors
            .newSingleThreadScheduledExecutor(new SlowThreadFactory());
    worldThread.start();
}

public static void shutdown() {
    serverWorkerChannelExecutor.shutdown();
    serverBossChannelExecutor.shutdown();
    fastExecutor.cancel();
    slowExecutor.shutdown();
    shutdown = true;
}

private CoresManager() {

}
}

我在游戏中使用这个：

    private void startTimer() {
    CoresManager.fastExecutor.scheduleAtFixedRate(new TimerTask() {
        @Override
        public void run() {
            if (timer == 0 || timer < 1) {
                player.sm("Your timer has ended! The NPCs will no longer spawn.");
                timer = 0;
                this.cancel();
                exitInstance(); 
                return;
            }
            timer--;
            timerchecker = true;
            seconds = timer % 60;
            player.setTimer(timer);
            minutes = TimeUnit.SECONDS.toMinutes(timer);            
        }
    }, 0, 1000);
}

如果播放器注销并且服务器重新启动，CoresManager计时器将停止运行。为了使其再次运行，我添加了代码以使其在您再次登录后再次执行startTimer（）。但是，由于如果服务器未注销，计时器仍在运行，因此计时器开始运行两次。根据您注销和登录的次数，计时器开始减去2或更多。我认为，如果有代码确定计时器是否已在运行，它将解决。有没有办法做到这一点？请帮忙！

Answer 1

我没有在文档中看到任何可检查TimerTask对象状态的文档（http://docs.oracle.com/javase/1.5.0/docs/api/java/util/TimerTask.html），选择是扩展TimerTask并创建您自己的类。除了使用匿名TimerTask之外，您还可以按照以下方式创建内容：

public class CoresTimerTask extends TimerTask {

    private boolean hasStarted = false;

    @Overrides
    public void run() {
        this.hasStarted = true;
        //rest of run logic here...
    }

    public boolean hasRunStarted() {
        return this.hasStarted;
    }
}

并仅维护对此CoresTimerTask对象的引用，然后将其传递给startTimer（）。然后，您可以稍后通过hasRunStarted检查该对象。