public final class KosUtil {

    // Private constructor, as this is a utility class:
    private KosUtil();

    //--- Time and Sleep ---

    // Returns the current actual time (in msec); same as System.currentTimeMillis():
    public static long currentTimeMs();

    // Returns the current mono time (monotonically increasing, in msec):
    public static long currentMonoMs();

    // Shorthand access to scheduler.sleep(), which allows for sleeping without the need to handle interrupts:
    public static void sleep(long ms);

    //--- JSON handling ---

    // Returns the shared JSON (Jackson) object mapper:
    public static ObjectMapper getMapper();

    // Returns the shared JSON writer cache:
    public static JsonWriterCache getWriters();  // [discussed on its own page]

    //--- Executing and scheduling runnables ---

    // Returns the system component that provides access to standard thread pools:
    public static Scheduler getScheduler();      // [discussed on its own page]

    // Shorthand access to scheduler.execute(), which runs a short duration task in a worker thread:
    public static void execute(Runnable runnable);

    // Shorthand access to scheduler.scheduleCallback(), which schedules a Runnable
    //  that is executed "delay" number of msec in the future:
    public static ScheduledFuture<?> scheduleCallback(Runnable command, long delay);
}

@Slf4j
public class KosUtilModule implements Module {

    // . . .

    private void logTimes() {
        log.info("> MonoMsec1: {}", KosUtil.currentMonoMs());
        log.info("> TimeMsec1: {}", KosUtil.currentTimeMs());
        log.info("> sleep(1000) called");
        KosUtil.sleep(1000);
        log.info("> MonoMsec2: {}", KosUtil.currentMonoMs());
        log.info("> TimeMsec2: {}", KosUtil.currentTimeMs());
    }
}

> ====== BEGIN =========================================
> MyKosApp.load()
> KosUtilModule.init()
> MyKosApp.start()
> KosUtilModule.run()
> MonoMsec1: 13420         (1)
> TimeMsec1: 1696961902018 (2)
> sleep(1000) called       (3)
> MonoMsec2: 14420         (4)
> TimeMsec2: 1696961903019 (5)
> ====== END ===========================================