protected function getDefaultServerSocket(array $config)
    {
        $unixSock = $config['unix_sock'] ?? $this->getDefaultUnixSock();

        $serverSocket = new UnixServerSocket($this->app, [
            'unix_sock' => $unixSock
        ]);

        $serverSocket->setEventHandler(new ServerEventHandler);

        return $serverSocket;
    }