Zar Qureshi Zar Qureshi - 1 year ago 64
Java Question

Is there a code to check if a timer is running?

I have a game where I am scheduling a timer. I have this CoresManager file:


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());

public static void shutdown() {
shutdown = true;

private CoresManager() {


I am using this inside the game:

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

The CoresManager Timer stops running if the player logs out AND the server gets rebooted. To make it run again, I added a code to make it do startTimer() again once you log back in. However, since the timer still runs if the server didn't log out, the timer starts running twice. The Timer starts getting subtracted by 2, or more, depending on how many times you log out and in. I figure that it would fix if there was a code to determine if the timer is already running. Is there a way to do this? Please help!

Answer Source

I don't see anything in the documentation that provides for checking the status on a TimerTask object ( so one option would be to extend TimerTask and create your own class. Instead of using an anonymous TimerTask, you could create something along the lines of:

public class CoresTimerTask extends TimerTask {

    private boolean hasStarted = false;

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

    public boolean hasRunStarted() {
        return this.hasStarted;

and just maintain a reference to this CoresTimerTask object, which you then pass into startTimer(). You can then later check this object via hasRunStarted.