public function repeat(float $interval, callable $func, array $args = []): int
    {
        $className = $this->eventClassName;
        $timerId = $this->timerId++;
        $event = new $className($this->eventBase, -1, $className::TIMEOUT | $className::PERSIST, $func);
        if (!$event->addTimer($interval)) {
            throw new \RuntimeException("Event::addTimer($interval) failed");
        }
        $this->eventTimer[$timerId] = $event;
        return $timerId;
    }