MyQEE\Server\Clusters\Client::getClient PHP Method

    public static function getClient($serverGroup, $serverId, $workerId, $isTask = false)
    {
        if (!$serverGroup) {
            # 服务器分组
            $serverGroup = Server::$config['clusters']['group'] ?: 'default';
        }
        if ($isTask) {
            $serverGroup .= '.task';
        }
        if (-1 === $serverId) {
            # 随机服务器ID
            $host = Host::getRandHostData($serverGroup);
            if ($host) {
                $serverId = $host['id'];
            }
        } else {
            # 随机ID
            $host = Host::$table->get("{$serverGroup}_{$serverId}");
        }
        if (!$host) {
            return false;
        }
        if (-1 === $workerId) {
            $workerId = mt_rand(0, $host['worker_num'] - 1);
        }
        # 生成一个KEY
        $key = "{$serverGroup}_{$serverId}_{$workerId}";
        if (!isset(self::$instances[$key])) {
            if (!isset($host)) {
                $host = Host::$table->get($serverId);
                if (!$host) {
                    return false;
                }
            }
            # 检查任务ID是否超出序号返回
            if ($workerId - $host['worker_num'] > 1) {
                return false;
            }
            /**
             * @var Client $client
             */
            $class = static::class;
            $client = new $class();
            $client->serverId = $serverId;
            $client->workerId = $workerId;
            $client->key = $host['key'];
            $client->ip = $host['ip'];
            $client->port = $host['port'];
            $rs = $client->connect();
            if (!$rs) {
                # 没有连接上去
                return false;
            }
            self::$instances[$key] = $client;
        }
        return self::$instances[$key];
    }