yii2框架随笔33
今天来看yii\base\InlineAction
namespace yii\base; use Yii; /** * InlineAction表示一个动作被定义为一个控制器的方法. * * The name of the controller method is available via [[actionMethod]] which * is set by the [[controller]] who creates this action. * * @author Qiang Xue <qiang.xue@gmail.com> * @since 2.0 */ class InlineAction extends Action { /** * @var string the controller method that this inline action is associated with */ public $actionMethod; /** * @param string $id the ID of this action * @param Controller $controller the controller that owns this action * @param string $actionMethod the controller method that this inline action is associated with * @param array $config name-value pairs that will be used to initialize the object properties */ public function __construct($id, $controller, $actionMethod, $config = []) { // 传入action的id,controller的实例,action方法的名称以及action的配置 $this->actionMethod = $actionMethod; parent::__construct($id, $controller, $config); } /** * 这个动作用指定的参数运行. * 这种方法主要是由控制器调用. * @param array $params action parameters * @return mixed the result of the action */ public function runWithParams($params) { // 获取action的参数,通过合并出入的参数和默认参数得出 $args = $this->controller->bindActionParams($this, $params); Yii::trace('Running action: ' . get_class($this->controller) . '::' . $this->actionMethod . '()', __METHOD__); if (Yii::$app->requestedParams === null) { // 记录请求的参数 Yii::$app->requestedParams = $args; } // 执行controller的这个action方法 return call_user_func_array([$this->controller, $this->actionMethod], $args); } } public function __construct($id, $module, $config = []) { + // 传入controller的id和所在的module的实例 $this->id = $id; $this->module = $module; parent::__construct($config); @@ -117,6 +118,7 @@ public function actions() */ public function runAction($id, $params = []) { + // 创建action的实例 $action = $this->createAction($id); if ($action === null) { throw new InvalidRouteException('Unable to resolve the request: ' . $this->getUniqueId() . '/' . $id); @@ -125,6 +127,7 @@ public function runAction($id, $params = []) Yii::trace("Route to run: " . $action->getUniqueId(), __METHOD__); if (Yii::$app->requestedAction === null) { + // 记录当前的action为requestedAction Yii::$app->requestedAction = $action; } @@ -135,24 +138,31 @@ public function runAction($id, $params = []) $runAction = true; // call beforeAction on modules + // 从外到里一层层执行module的beforeAction foreach ($this->getModules() as $module) { if ($module->beforeAction($action)) { + // 将执行成功的module放入到$modules中,顺序会颠倒 array_unshift($modules, $module); } else { + // 执行失败,就标记一下,并跳出循环 $runAction = false; break; } } $result = null; + // modules的beforeAction执行成功而且controller本身的beforeAction也执行成功 if ($runAction && $this->beforeAction($action)) { // run the action + // 执行action $result = $action->runWithParams($params); + // 执行controller本身的afterAction $result = $this->afterAction($action, $result); // call afterAction on modules + // 从里到外一层层执行所有modules的beforeAction foreach ($modules as $module) { /* @var $module Module */ $result = $module->afterAction($action, $result); @@ -211,17 +221,25 @@ public function bindActionParams($action, $params) public function createAction($id) { if ($id === '') { + // 如果action的id为空,就是用默认的action $id = $this->defaultAction; } + // 获取actions方法中的定义的actionMap $actionMap = $this->actions(); if (isset($actionMap[$id])) { + // 如果action的id在actionMap中,就去创建这个action return Yii::createObject($actionMap[$id], [$id, $this]); } elseif (preg_match('/^[a-z0-9\\-_]+$/', $id) && strpos($id, '--') === false && trim($id, '-') === $id) { + // 如果id符合命名规范,并且不存在--,而且两边不存在- + // 必须是数字/小写字母/右斜线/中划线/下划线组成的的 + // 用与拼接controller类名类似的方法拼接action方法的名称 $methodName = 'action' . str_replace(' ', '', ucwords(implode(' ', explode('-', $id)))); if (method_exists($this, $methodName)) { + // 如果方法存在,就new一个ReflectionMethod实例 $method = new \ReflectionMethod($this, $methodName); if ($method->isPublic() && $method->getName() === $methodName) { + // 如果方法是public的,就new一个InlineAction返回 return new InlineAction($id, $this, $methodName); } } @@ -297,9 +315,13 @@ public function afterAction($action, $result) */ public function getModules() { + // 用当前controller的module组成modules的数组 $modules = [$this->module]; $module = $this->module; + // 遍历module的module,直到为空 while ($module->module !== null) { + // array_unshift — 在数组开头插入一个或多个单元 + // 将外面的module插入到modules数组的开头 array_unshift($modules, $module->module); $module = $module->module; }