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我有问题获得依赖注入来处理依赖性反转。我可以在构造函数中调用App :: make，并且依赖性反转工作正常......只有当我尝试将其注入构造函数中时，才会遇到问题。Laravel依赖注入域名空间
ReflectionException Class StationsInterface does not exist
会打这将是... /统计/站/ mogreet一个URI/6
文件Stucture：
-app
-controllers
*StatsController
-Dashboard
-Datasync
-Interfaces
*DatasyncInterface
*MogreetDatasyncInterface
-Services
*MogreetDatasync
*BackendServiceProvider
*DatasyncBase
-Repositories
-Interfaces
*CredentialsInterface
*StationsInterface
-Stations
*DbCredentials
*DbStations
*FileCredentials
-Stats
*BackendServiceProvider
*DbRepositoryBase
相关的代码块如下：
服务提供商：
<?php namespace Dashboard\Repositories;
use Illuminate\Support\ServiceProvider;
class BackendServiceProvider extends ServiceProvider {
public function register() {
// Service Providers located in Stats directory
$this->app->bind('StatsDailyInterface', 'Dashboard\Repositories\Stats\DbStatsDaily');
//$this->app->bind('StatsMonthlyRepository', 'Dashboard\Repositories\Stats\DbStatsMonthly');
//$this->app->bind('StatsYearlyRepository', 'Dashboard\Repositories\Stats\DbStatsYearly');
// Service Providers located in Stations directory
$this->app->bind('CredentialsInterface', 'Dashboard\Repositories\Stations\FileCredentials');
$this->app->bind('StationsInterface', 'Dashboard\Repositories\Stations\DbStations');
}
}
Controller：请注意，在此构造函数中，我使用App :: make而不是注入依赖项。如果我注入依赖关系，就会像我在DatasyncBase类中那样得到一个类解析错误。
<?php
use Dashboard\ConrollerFacades\Facades\Services;
class StatsController extends BaseController {
/*
|--------------------------------------------------------------------------
| Stats Controller
|--------------------------------------------------------------------------
|
| Pull and display stats for station, market, or corporate views
|
|
|
*/
private $StationModel;
public function __construct() {
$this->StationModel = App::make('StationsInterface');
}
/**
* Pulls stats for an individual station
*
* @param string $service of station
* @param integer $id of station
*
* @return void
*/
public function station($service, $stationId) {
$this->Service = $this->serviceSelector($service);
if(!$this->Service) throw new Exception('Unknown Service Selected', 1);
$this->Service->init($stationId);
exit();
}
/**
* Pulls stats for a Market
*
* @param integer $id of market
*
* @return void
*/
public function market($service, $marketId) {
$this->Service = $this->serviceSelector($service);
if(!$this->Service) throw new Exception('Unknown Service Selected', 1);
foreach($StationModel->getStationIdsByMarket($marketId) as $station) {
$this->Service->init($station);
}
exit();
}
/**
* Pulls stats for Corporate (all stations)
*
* @return void
*/
public function corporate($service) {
$this->Service = $this->serviceSelector($service);
if(!$this->Service) throw new Exception('Unknown Service Selected', 1);
foreach($StationModel->getAllStationIds() as $station) {
$this->Service->init($station);
}
exit();
}
private function serviceSelector($service) {
switch(strtolower($service)) {
case 'brightcove': return App::make('BrightCoveDatasyncInterface'); break;
case 'facebook': return App::make('FacebookDatasyncInterface'); break;
case 'googleanalytics': return App::make('GoogleAnalyticsDatasyncInterface'); break;
case 'liquidcompass': return App::make('LiquidCompassDatasyncInterface'); break;
case 'mogreet': return App::make('MogreetDatasyncInterface'); break;
case 'twitter': return App::make('TwitterDatasyncInterface'); break;
default: return false; break;
}
}
}
这个类的构造函数就是依赖注入的问题发生。 DatasyncBase：这个类永远不会被直接实例化，它是由像MogreetDatasync这样的服务类继承的。将构造函数移到MogreetDatasync类进行测试并不能解决问题。
<?php namespace Dashboard\Datasync;
use Dashboard\Repositories\Interfaces\StationsInterface;
use Dashboard\Repositories\Interfaces\CredentialsInterface;
class DatasyncBase {
protected $Station;
protected $Credentials;
protected $results;
protected $stats;
public function __construct(StationsInterface $Station , CredentialsInterface $Credentials) {
$this->Station = $Station;
$this->Credentials = $Credentials;
$this->stats = array();
}
public function __destruct() {
unset($this->results);
unset($this->stats);
}
public function init() {}
protected function fetch($uri = null, $post_fields = null) {
$cURL = curl_init();
curl_setopt($cURL, CURLOPT_URL, $uri);
curl_setopt($cURL, CURLOPT_CUSTOMREQUEST, 'GET');
curl_setopt($cURL, CURLOPT_POSTFIELDS, $post_fields);
$this->results = curl_exec($cURL);
curl_close($cURL);
}
}
一个数据同步服务：
<?php namespace Dashboard\Datasync\Services;
use Dashboard\Datasync\DatasyncBase;
use Dashboard\Datasync\Interfaces\MogreetDatasyncInterface;
class MogreetDatasync extends DatasyncBase implements MogreetDatasyncInterface {
public function init($stationId) {}
protected function uri() {}
protected function parse() {}
protected function write() {}
}
你在哪里实例化DatasyncBase类？你是否意识到如果你想让laravel从IOC容器注入依赖关系，你必须使用App :: make（）？ – jah
DatasyncBase类只是Datasync的父类，所以它通过MogreetDatasync的继承来实例化。我并不知道你必须使用App :: make（）来注入依赖关系，大多数例子中我只使用bind。我将开始研究这种方法，但如果您有一个很好的示例/教程，您可以指点我，这将非常感激。 – David
类型提示自动注入是Laravel所做的事情，而不是PHP所做的。您可以从控制器构造函数注入的原因是因为它使用Laravel的IOC容器的build（）方法实例化。看看这个班级，你会更好地理解发生了什么。我甚至相信Laracasts有关于它的截屏:) – jah