Yii源码阅读笔记(十二)
Action类,控制器中方法的基类:
namespace yii\base; use Yii; /** * Action is the base class for all controller action classes. * Action是所有控制器方法的基类 * Action provides a way to reuse action method code. An action method in an Action * class can be used in multiple controllers or in different projects. * Action提供了一种重用代码的方法,一个Action类中的方法可以被多个控制器或不同的项目调用 * Derived classes must implement a method named `run()`. This method * will be invoked by the controller when the action is requested. * 驱动类必须实现run()方法,该方法在action被请求的时候被控制器调用 * The `run()` method can have parameters which will be filled up * with user input values automatically according to their names. * 如果请求带有参数,run方法会自动带参数运行,例如: * For example, if the `run()` method is declared as follows: * * ```php * public function run($id, $type = 'book') { ... } * ``` * * And the parameters provided for the action are: `['id' => 1]`. * Then the `run()` method will be invoked as `run(1)` automatically. * * @property string $uniqueId The unique ID of this action among the whole application. This property is * read-only. * * @author Qiang Xue <qiang.xue@gmail.com> * @since 2.0 */ class Action extends Component { /** * @var action的ID */ public $id; /** * @var Controller|\yii\web\Controller 当前action的控制器 */ public $controller; /** * Constructor. * 构造函数,用于初始化action 的ID和控制器,并且调用component的构造方法初始化对象 * * @param string $id the ID of this action * @param Controller $controller the controller that owns this action * @param array $config name-value pairs that will be used to initialize the object properties */ public function __construct($id, $controller, $config = []) { $this->id = $id; $this->controller = $controller; parent::__construct($config); } /** * Returns the unique ID of this action among the whole application. * 用于取得当前action的唯一ID 形式为controller ID/action ID * @return string the unique ID of this action among the whole application. */ public function getUniqueId() { return $this->controller->getUniqueId() . '/' . $this->id; } /** * Runs this action with the specified parameters. * This method is mainly invoked by the controller. * 用指定的参数运行,该方法主要被控制器调用 * * @param array $params the parameters to be bound to the action's run() method. * @return mixed the result of the action * @throws InvalidConfigException if the action class does not have a run() method */ public function runWithParams($params) { if (!method_exists($this, 'run')) {//如果run方法不存在,抛出异常 throw new InvalidConfigException(get_class($this) . ' must define a "run()" method.'); } $args = $this->controller->bindActionParams($this, $params);//绑定参数 Yii::trace('Running action: ' . get_class($this) . '::run()', __METHOD__);//记录trace信息 if (Yii::$app->requestedParams === null) { Yii::$app->requestedParams = $args;//如果是命令行运行,按命令行方式获取参数 } if ($this->beforeRun()) {//调用run的前置操作 $result = call_user_func_array([$this, 'run'], $args);//用php内置函数带参数执行run方法 $this->afterRun();//调用后置操作 return $result;//返回结果 } else { return null; } } /** * This method is called right before `run()` is executed. * You may override this method to do preparation work for the action run. * If the method returns false, it will cancel the action. * run方法的前置方法,通常在子类中重写来实现某些前置功能 * * @return boolean whether to run the action. */ protected function beforeRun() { return true; } /** * This method is called right after `run()` is executed. * You may override this method to do post-processing work for the action run. * run方法的后置方法,通常在子类中重写来实现某些后置功能 * */ protected function afterRun() { } }
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