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我有問題獲得依賴注入來處理依賴性反轉。我可以在構造函數中調用App :: make，並且依賴性反轉工作正常......只有當我嘗試將其注入構造函數中時，纔會遇到問題。Laravel依賴注入域名空間
ReflectionException Class StationsInterface does not exist
會打這將是... /統計/站/ mogreet一個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
相關的代碼塊如下：
服務提供商：
<?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：請注意，在此構造函數中，我使用App :: make而不是注入依賴項。如果我注入依賴關係，就會像我在DatasyncBase類中那樣得到一個類解析錯誤。
<?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;
}
}
}
這個類的構造函數就是依賴注入的問題發生。 DatasyncBase：這個類永遠不會被直接實例化，它是由像MogreetDatasync這樣的服務類繼承的。將構造函數移到MogreetDatasync類進行測試並不能解決問題。
<?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($cURL);
}
}
一個數據同步服務：
<?php namespace Dashboard\Datasync\Services;
use Dashboard\Datasync\DatasyncBase;
use Dashboard\Datasync\Interfaces\MogreetDatasyncInterface;
class MogreetDatasync extends DatasyncBase implements MogreetDatasyncInterface {
public function init($stationId) {}
protected function uri() {}
protected function parse() {}
protected function write() {}
}
你在哪裏實例化DatasyncBase類？你是否意識到如果你想讓laravel從IOC容器注入依賴關係，你必須使用App :: make（）？ – jah
DatasyncBase類只是Datasync的父類，所以它通過MogreetDatasync的繼承來實例化。我並不知道你必須使用App :: make（）來注入依賴關係，大多數例子中我只使用bind。我將開始研究這種方法，但如果您有一個很好的示例/教程，您可以指點我，這將非常感激。 – David
類型提示自動注入是Laravel所做的事情，而不是PHP所做的。您可以從控制器構造函數注入的原因是因爲它使用Laravel的IOC容器的build（）方法實例化。看看這個班級，你會更好地理解發生了什麼。我甚至相信Laracasts有關於它的截屏:) – jah