vendor/topthink/framework/src/think/Manager.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2021 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: yunwuxin <448901948@qq.com>
// +----------------------------------------------------------------------
declare (strict_types = 1);

namespace think;

use InvalidArgumentException;
use think\helper\Str;

abstract class Manager
{
    /** @var App */
    protected $app;

    /**
     * 驱动
     * @var array
     */
    protected $drivers = [];

    /**
     * 驱动的命名空间
     * @var string
     */
    protected $namespace = null;

    public function __construct(App $app)
    {
        $this->app = $app;
    }

    /**
     * 获取驱动实例
     * @param null|string $name
     * @return mixed
     */
    protected function driver(string $name = null)
    {
        $name = $name ?: $this->getDefaultDriver();

        if (is_null($name)) {
            throw new InvalidArgumentException(sprintf(
                'Unable to resolve NULL driver for [%s].',
                static::class
            ));
        }

        return $this->drivers[$name] = $this->getDriver($name);
    }

    /**
     * 获取驱动实例