public function hasExpiredWorkerHandler()
    {
        $hasExpired = false;
        $timeout    = AlphaRPC::WORKER_HANDLER_TIMEOUT;
        $validTime  = microtime(true) - ($timeout / 1000);

        foreach ($this->workerHandlers as $handlerId => $time) {
            if ($time >= $validTime) {
                break;
            }

            unset($this->workerHandlers[$handlerId]);
            $hasExpired = true;
        }

        return $hasExpired;
    }