src/Cache/ExpiringCache.php
protected function createCleanupTimer() {
        if (isset($this->_timer)) {
            $this->loop->cancelTimer($this->_timer);
        }
        $this->_timer = $this->loop->addPeriodicTimer($this->timerInterval, [$this, 'cleanupTimerCallback']);
    }
protected function createCleanupTimer() {
        if (isset($this->_timer)) {
            $this->loop->cancelTimer($this->_timer);
        }
        $this->_timer = $this->loop->addPeriodicTimer($this->timerInterval, [$this, 'cleanupTimerCallback']);
    }
Create cleanup timer