private @NotNull List<MyScheduledFutureTask<?>> getMyTasksFromDelayQueue() {
    List<MyScheduledFutureTask<?>> result = new ArrayList<>();
    for (MyScheduledFutureTask<?> task : delayQueue) {
      if (task.getBackendExecutorService() == backendExecutorService) {
        result.add(task);
      }
    }
    return result;
  }
private @NotNull List<MyScheduledFutureTask<?>> getMyTasksFromDelayQueue()