GatewayWorker报错：Waring: Events::onMessage is not callable

在使用workman的GatewayWorker时，启动时会出现报错：Waring: Events::onMessage is not callable，解决办法如下：

在start_businessworker.php文件中，增加两行代码：

require_once __DIR__ . '/Events.php';
$worker->eventHandler = 'Events';

编辑后的文件如下：

<?php 
/**
 * This file is part of workerman.
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the MIT-LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @author walkor<walkor@workerman.net>
 * @copyright walkor<walkor@workerman.net>
 * @link http://www.workerman.net/
 * @license http://www.opensource.org/licenses/mit-license.php MIT License
 */
use \Workerman\Worker;
use \Workerman\WebServer;
use \GatewayWorker\Gateway;
use \GatewayWorker\BusinessWorker;
use \Workerman\Autoloader;

// 自动加载类
require_once __DIR__ . '/../../vendor/autoload.php';
require_once __DIR__ . '/Events.php'; //这行代码防止出现报错：Waring: Events::onMessage is not callable

// bussinessWorker 进程
$worker = new BusinessWorker();
// worker名称
$worker->name = 'Lilei_BusinessWorker';
// bussinessWorker进程数量
$worker->count = 4;
// 服务注册地址
$worker->registerAddress = '127.0.0.1:1238';
$worker->eventHandler = 'Events';  //这行代码防止出现报错：Waring: Events::onMessage is not callable

// 如果不是在根目录启动，则运行runAll方法
if(!defined('GLOBAL_START'))
{
    Worker::runAll();
}

重新启动后，报错消失。