Question

我试图通过使用Laravel服务提供商来学习IoC的概念。到目前为止我所读到的内容，您应该包含依赖于服务提供者中其他类的所有类创建逻辑。公平和正方形，但我想确保我以正确的方式做到这一点。

我的应用程序将使用抽象Tracker类的子类，根据您向服务提供者提供的常量，它应该加载不同的类。这是正确的方法吗？

服务提供商：

class TrackerServiceProvider extends \Illuminate\Support\ServiceProvider {
    const TRACKER_API  = 0;
    const TRACKER_SITE = 1;

    public function register() {
        $this->app->bind('Tracker', function($app, $parameters) {
            switch($parameters['method']) {
                case static::TRACKER_API:
                    return new TrackerAPI(new cURL(),  new Shipment($parameters['number']));

                    break;
                case static::TRACKER_SITE:
                    return new TrackerSite(new cURL(), new Shipment($parameters['number']));

                    break;
                default:
                    throw Exception('Unknown tracker method provided.');

                    break;
            }
        });
    }
}

抽象的Tracker类（只是基础）：

abstract class Tracker {
    protected $curl;
    protected $shipment;


    function __construct(cURL $curl, Shipment $shipment) {
        $this->curl     = $curl;
        $this->shipment = $shipment;



    }
}

或者我应该在register方法中创建两个不同的绑定，每个类一个？像这样：

class TrackerServiceProvider extends \Illuminate\Support\ServiceProvider {
    public function register() {
        $this->app->bind('TrackerAPI', function($app, $number) {
             return new TrackerAPI(new cURL(),  new Shipment($number));
        });

        $this->app->bind('TrackerSite', function($app, $parameters) {
             return new TrackerSite(new cURL(),  new Shipment($number));
        });
    }
}

Answer 1

我更喜欢在此处设置Factory以将其与ServiceProvider分离。以下代码只是一个演示，最好不要使用下面TrackerFactory中的静态方法。

class TrackerFactory {
    const TRACKER_API  = 0;
    const TRACKER_SITE = 1;

    public static function make($parameters) {
        switch($parameters['method']) {
            case static::TRACKER_API:
                return new TrackerAPI(new cURL(),  new Shipment($parameters['number']));

                break;
            case static::TRACKER_SITE:
                return new TrackerSite(new cURL(), new Shipment($parameters['number']));

                break;
            default:
                throw Exception('Unknown tracker method provided.');

                break;
        }
    }
}

然后绑定它。

class TrackerServiceProvider extends \Illuminate\Support\ServiceProvider {

    public function register() {
        $this->app->bind('Tracker', function($app, $parameters) {
            return TrackerFactory::make($parameters)
        });
    }
}

Laravel IoC - 我这样做对吗？

1 个答案: