ChangeablePeriodTask.java

import org.bukkit.plugin.Plugin;
import org.bukkit.scheduler.BukkitRunnable;
import org.bukkit.scheduler.BukkitTask;

// Author: Dymeth.Ru
public abstract class ChangeablePeriodTask extends BukkitRunnable {
    public long periodTicks; // Количество тиков между циклами
    private long delayTicks; // Количество тиков до отработки следующего цикла

    public ChangeablePeriodTask() {
    }

    @Override
    public final void run() {
        if (--this.delayTicks > 0) return;
        try {
            this.runCycle();
        } finally {
            this.delayTicks = this.periodTicks;
        }
    }

    public abstract void runCycle();

    @Override
    public BukkitTask runTask(Plugin plugin) throws IllegalArgumentException, IllegalStateException {
        throw new UnsupportedOperationException("Timers supported only");
    }

    @Override
    public BukkitTask runTaskAsynchronously(Plugin plugin) throws IllegalArgumentException, IllegalStateException {
        throw new UnsupportedOperationException("Timers supported only");
    }

    @Override
    public BukkitTask runTaskLater(Plugin plugin, long delay) throws IllegalArgumentException, IllegalStateException {
        throw new UnsupportedOperationException("Timers supported only");
    }

    @Override
    public BukkitTask runTaskLaterAsynchronously(Plugin plugin, long delay) throws IllegalArgumentException, IllegalStateException {
        throw new UnsupportedOperationException("Timers supported only");
    }

    @Override
    public synchronized BukkitTask runTaskTimer(Plugin plugin, long delay, long period) throws IllegalArgumentException, IllegalStateException {
        this.setPeriodTicks(period);
        this.setDelayTicks(delay + 1);
        return super.runTaskTimer(plugin, 1L, 1L);
    }

    @Override
    public synchronized BukkitTask runTaskTimerAsynchronously(Plugin plugin, long delay, long period) throws IllegalArgumentException, IllegalStateException {
        this.setPeriodTicks(period);
        this.setDelayTicks(delay + 1);
        return super.runTaskTimerAsynchronously(plugin, 1L, 1L);
    }

    public long getPeriodTicks() {
        return this.periodTicks;
    }

    public void setPeriodTicks(long periodTicks) {
        if (periodTicks <= 0) throw new IllegalArgumentException("periodTicks must be > 0");
        this.periodTicks = periodTicks;
    }

    private void setDelayTicks(long delayTicks) {
        if (delayTicks < 0) throw new IllegalArgumentException("delayTicks must be >= 0");
        this.delayTicks = delayTicks;
    }
}