public function getEventBus()
    {
        if ($this->eventBus) {
            return $this->eventBus;
        }

        if (isset(static::$staticEventBus) && static::$staticEventBus) {
            return static::$staticEventBus;
        }

        if (!$this->eventBus) {
            $this->eventBus = Bus::instance();
        }
        return $this->eventBus;
    }