public class BoardImpl implements Board {//Runnable, AutoCloseable
    private static final Cleaner cleaner = Cleaner.create();
    //Задач > 16 быть не может!(дефолт капасити - 16, но поставил для справки)
    private final PriorityQueue<BoardTask> tasksQueue = new PriorityQueue<>(16,
            Comparator.comparingLong(BoardTask::getNextRun)
    );
    private final Map<Integer, String> scores = new HashMap<>(16);
    private final Scoreboard board;
    private final Objective objective;
    private final Cleaner.Cleanable cleanable;

    public BoardImpl(String displayName) {
        this.board = Objects.requireNonNull(Bukkit.getScoreboardManager()).getNewScoreboard();
        this.objective = board.registerNewObjective("test", "dummy", displayName);
        this.objective.setDisplaySlot(DisplaySlot.SIDEBAR);
        this.cleanable = cleaner.register(this, () -> {
            tasksQueue.clear();//Удаляем задачи
            scores.clear();//Хз, на всякий случай
        });
    }
    /*@Override
    protected void finalize() {
        tasksQueue.clear();
    }*/

    @Override
    public void setDisplayName(String displayName) {
        this.objective.setDisplayName(displayName);
    }
    @Override
    public Board insertScore(int score, String entry) {
        scores.compute(score, (integer, line) -> {
            if(line != null) {
                board.resetScores(line);
            }
            objective.getScore(entry).setScore(score);
            return entry;
        });
        return this;
    }
    @Override
    public void addTask(Consumer<? super Board> runnable, long delay, long period, @NotNull TimeUnit scale) {
        BoardTask task = new BoardTask(() -> runnable.accept(this), scale.toMillis(period));
        task.setNextRun(System.currentTimeMillis() + scale.toMillis(delay));
        tasksQueue.add(task);
    }

    @Override
    public void shutdownNow() {
        tasksQueue.clear();
    }
    @Override
    public void resetScores(String entry) {
        board.resetScores(entry);
    }
    @Override
    public void sendPlayers(Player @NotNull ... player) {
        for(Player p : player) {
            p.setScoreboard(board);
        }
    }
    @Override
    public void sendPlayer(@NotNull Player player) {
        player.setScoreboard(board);
    }
    @Override
    public void run() {
        long now = System.currentTimeMillis();
        BoardTask task = tasksQueue.poll();
        if(task == null) {
            return;
        }
        if(now >= task.getNextRun()) {
            task.getRunnable().run();
        }
        task.setNextRun(now + task.getPeriod());
        tasksQueue.add(task);
    }

    @Override
    public void close() {
        cleanable.clean();
    }
}