yii框架源码分析(三)

转载请注明：TheViper http://www.cnblogs.com/TheViper/

上一篇说到CWebApplication中的￥route=$this->getUrlManager ()->parseUrl ($this->getRequest());,得到$route=controler/actionid。

这篇说他后面的$this->runController ( $route );

 1 php  2class CWebApplication extends CApplication {  3public$controllerNamespace;  4private$_controllerPath;  5private$_viewPath;  6private$_systemViewPath;  7private$_controller;  8public$controllerMap=array();  9publicfunction processRequest() {//开始执行请求 10 //获取urlManager组件，解析请求，得到controller/action这种格式的string, 11 //并且将隐藏参数与请求的参数一一对应，匹配起来，写入$_REQUEST中12$route = $this->getUrlManager ()->parseUrl ($this->getRequest()); 13$this->runController ( $route ); 14 } 15publicfunction getRequest() {//获取request组件16return$this->getComponent ( 'request' ); 17 } 18protectedfunction registerCoreComponents() {//注册核心组件19 parent::registerCoreComponents (); 20 } 21//执行contronller22publicfunction runController($route) { 23if (($ca = $this->createController ( $route )) !== null) { 24list ( $controller, $actionID ) = $ca; 25$oldController = $this->_controller; 26$this->_controller = $controller; 27$controller->init ();//钩子,在执行action方法前调用，子类去实现28$controller->run ( $actionID );//开始转入controller类中action方法的执行29$this->_controller = $oldController; 30 } 31 } 32//创建controller类实例,从controller/action这种格式的string中解析出$controller, $actionID 33publicfunction createController($route, $owner = null) { 34if ($owner === null) 35$owner = $this; 36if (($route = trim ( $route, '/' )) === '') 37$route = $owner->defaultController; 3839$route .= '/'; 40while ( ($pos = strpos ( $route, '/' )) !== false ) { 41$id = substr ( $route, 0, $pos ); 42if (! preg_match ( '/^\w+$/', $id )) 43returnnull; 44$id = strtolower ( $id ); 45$route = ( string ) substr ( $route, $pos + 1 ); 46if (! isset ( $basePath )) // first segment47 { 48$basePath = $owner->getControllerPath (); 49$controllerID = ''; 50 } else { 51$controllerID .= '/'; 52 } 53$className = ucfirst ( $id ) . 'Controller'; 54$classFile = $basePath . DIRECTORY_SEPARATOR . $className . '.php'; 5556if (is_file ( $classFile )) { 57if (! class_exists ( $className, false )) 58require ($classFile); 59if (class_exists ( $className, false ) && is_subclass_of ( $className, 'CController' )) { 60$id [0] = strtolower ( $id [0] ); 61returnarray ( 62new$className ( $controllerID . $id, $owner === $this ? null : $owner ), 63$this->parseActionParams ( $route ) 64 ); 65 } 66returnnull; 67 } 68$controllerID .= $id; 69$basePath .= DIRECTORY_SEPARATOR . $id; 70 } 71 } 72protectedfunction parseActionParams($pathInfo) { 73if (($pos = strpos ( $pathInfo, '/' )) !== false) { 74$manager = $this->getUrlManager ();//再次获取urlManager,在上面第一次调用中已经导入。75$manager->parsePathInfo ( ( string ) substr ( $pathInfo, $pos + 1 ) ); 76$actionID = substr ( $pathInfo, 0, $pos ); 77return$manager->caseSensitive ? $actionID : strtolower ( $actionID ); 78 } else79return$pathInfo; 80 } 81publicfunction getControllerPath() { 82if ($this->_controllerPath !== null) 83return$this->_controllerPath; 84else85return$this->_controllerPath = $this->getBasePath () . DIRECTORY_SEPARATOR . 'controllers'; 86 } 87//两个钩子,子类去实现88publicfunction beforeControllerAction($controller, $action) { 89returntrue; 90 } 91publicfunction afterControllerAction($controller, $action) { 92 } 93protectedfunction init() { 94 parent::init (); 95 } 96 }

$ca = $this->createController ( $route ))；createController的作用是将$route中的controller和action分离出来，并创建controller实例。

最后返回controller实例和actionid.

然后回到CWebApplication的runController($route),$controller->init ();在controller初始化时执行，这个需要在子类中重写，比如：

 1class VideoController extends CController {  2publicfunction init() {  3$this->db = Yii::app ()->db;  4 }  5publicfunction actionBroadcast() {  6$b = $this->db->query ( "", array (1 ) );  7$this->render ( "u_broadcast", array (  8 'b' => $b [0] ；  9 ) ); 10 } 11 }    

这样在VideoController中便可以用$this->db调用db组件了。

$controller->run ( $actionID );转入Ccontroller.

 1 php  2class CController {  3protected$db;  4public$defaultAction = 'index';  5private$_id;  6private$_action;  7publicfunction __construct($id, $module = null) {  8$this->_id = $id;  9 } 10publicfunction init() { 11 } 12//过滤方法,子类重写13publicfunction filters() { 14returnarray (); 15 } 16publicfunction run($actionID) { 17//创建action实例18if (($action = $this->createAction ( $actionID )) !== null) { 19$parent = Yii::app (); 20if ($parent->beforeControllerAction ( $this, $action )) { 21$this->runActionWithFilters ( $action, $this->filters () ); 22$parent->afterControllerAction ( $this, $action ); 23 } 24 } 25 } 26publicfunction refresh($terminate = true, $anchor = '') { 27$this->redirect ( Yii::app ()->getRequest ()->getUrl () . $anchor, $terminate ); 28 } 29publicfunction redirect($url, $terminate = true, $statusCode = 302) { 30 Yii::app ()->getRequest ()->redirect ( $url, $terminate, $statusCode ); 31 } 32//如果controller里面有filter33publicfunction runActionWithFilters($action, $filters) { 34if (empty ( $filters )) 35$this->runAction ( $action ); 36else { 37$priorAction = $this->_action; 38$this->_action = $action; 39 CFilterChain::create ( $this, $action, $filters )->run (); 40$this->_action = $priorAction; 41 } 42 } 43publicfunction runAction($action) { 44$priorAction = $this->_action; 45$this->_action = $action; 46if ($this->beforeAction ( $action )) { 47if ($action->runWithParams ( $this->getActionParams () ) === false) 48$this->invalidActionParams ( $action ); 49else50$this->afterAction ( $action ); 51 } 52$this->_action = $priorAction; 53 } 54//渲染视图55publicfunction render($view, $data = array()) { 56if (isset ( $data )) 57extract ( $data ); 58include VIEWS_DIR . "/" . $this->_id . "/" . $view . ".php"; 59 } 60publicfunction renderFile($file, $data = array()) { 61if (isset ( $data )) 62extract ( $data ); 63include VIEWS_DIR . "/" . $file; 64 } 65//跳转到另一个controller/action,不过浏览器的地址没有变66publicfunction forward($route) { 67if (strpos ( $route, '/' ) === false) 68$this->run ( $route ); 69else { 70//不在同一个controller里面，重新创建71 Yii::app ()->runController ( $route ); 72 } 73 } 74publicfunction getActionParams() { 75return$_GET; 76 } 77publicfunction createAction($actionID) { 78if ($actionID === '') 79$actionID = $this->defaultAction; 80if (method_exists ( $this, 'action' . $actionID ) && strcasecmp ( $actionID, 's' )) 81returnnew CInlineAction ( $this, $actionID ); 82 } 83publicfunction getAction() { 84return$this->_action; 85 } 86publicfunction setAction($value) { 87$this->_action = $value; 88 } 89publicfunction getId() { 90return$this->_id; 91 } 92//两个钩子93protectedfunction beforeAction($action) { 94returntrue; 95 } 96protectedfunction afterAction($action) { 97 } 98 }

$this->createAction ( $actionID );创建action实例.

然后是runActionWithFilters($action, $filters)；如果没有filter(),直接runAction($action)。

$action->runWithParams ( $this->getActionParams () ).$action是CInlineAction实例。

 1 php  2class CInlineAction extends CAction  3{  4//执行该动作 5publicfunction run()  6 {  7$method='action'.$this->getId();  8$this->getController()->$method();  9 } 10//执行带提供的请求的参数的动作11publicfunction runWithParams($params) 12 { 13$methodName='action'.$this->getId();//拼接action方法14$controller=$this->getController(); 15$method=new ReflectionMethod($controller, $methodName);//反射16if($method->getNumberOfParameters()>0)//方法参数个数>017return$this->runWithParamsInternal($controller, $method, $params); 18else19return$controller->$methodName(); 20 } 21 }

CAction

 1 php  2abstractclass CAction extends CComponent  3{  4private$_id;  5private$_controller;  6publicfunction __construct($controller,$id)  7 {  8$this->_controller=$controller;  9$this->_id=$id; 10 } 11publicfunction getController() 12 { 13return$this->_controller; 14 } 15publicfunction getId() 16 { 17return$this->_id; 18 } 19//运行带有请求参数的对象。 这个方法通过CController::runAction()内部调用20publicfunction runWithParams($params) 21 { 22$method=new ReflectionMethod($this, 'run'); 23if($method->getNumberOfParameters()>0) 24return$this->runWithParamsInternal($this, $method, $params); 25else26return$this->run(); 27 } 28//执行一个带有命名参数的对象的方法29protectedfunction runWithParamsInternal($object, $method, $params) 30 { 31$ps=array(); 32foreach($method->getParameters() as$i=>$param) 33 { 34$name=$param->getName(); 35if(isset($params[$name])) 36 { 37if($param->isArray()) 38$ps[]=is_array($params[$name]) ? $params[$name] : array($params[$name]); 39elseif(!is_array($params[$name])) 40$ps[]=$params[$name]; 41else42returnfalse; 43 } 44elseif($param->isDefaultValueAvailable()) 45$ps[]=$param->getDefaultValue(); 46else47returnfalse; 48 } 49$method->invokeArgs($object,$ps);//反射，执行50returntrue; 51 } 52 }

这两个类都很简单，就是执行controller类中的action方法。

回到上面的runActionWithFilters($action, $filters)；如果有filter(),CFilterChain::create ( $this, $action, $filters )->run ();

显然，如果有filter的话必须在执行action方法前，就设置好filter过滤器列表。

CFilterChain就是将类似于'application.filters.LoginFilter+upload_video' 这种配置解析成过滤器链。

过滤器链的每一项是一个CInlineFilter或CFilter实例。

 1 php  2//过滤器列表 3class CFilterChain extends CList {  4public$controller;  5public$action;  6public$filterIndex = 0;  7publicfunction __construct($controller, $action) {  8$this->controller = $controller;  9$this->action = $action; 10 } 11//创建过滤器列表12publicstaticfunction create($controller, $action, $filters) { 13$chain = new CFilterChain ( $controller, $action ); 14$actionID = $action->getId (); 15foreach ( $filtersas$filter ) { 16if (is_string ( $filter )) // filterName [+|- action1 action2]17 { 18if (($pos = strpos ( $filter, '+' )) !== false || ($pos = strpos ( $filter, '-' )) !== false) { 19$matched = preg_match ( "/\b{$actionID}\b/i", substr ( $filter, $pos + 1 ) ) > 0; 20if (($filter [$pos] === '+') === $matched) 21$filter = CInlineFilter::create ( $controller, trim ( substr ( $filter, 0, $pos ) ) ); 22 } else23$filter = CInlineFilter::create ( $controller, $filter ); 24 } elseif (is_array ( $filter )) // array('path.to.class [+|- action1, action2]','param1'=>'value1',...)25 { 26$filterClass = $filter [0]; 27unset ( $filter [0] ); 28//开始解析过滤器配置29if (($pos = strpos ( $filterClass, '+' )) !== false || ($pos = strpos ( $filterClass, '-' )) !== false) { 30preg_match ( "/\b{$actionID}\b/i", substr ( $filterClass, $pos + 1 ), $a ); 31$matched = preg_match ( "/\b{$actionID}\b/i", substr ( $filterClass, $pos + 1 ) ) > 0; 32//如果是filterName+action，创建一个过滤器,否则忽略33if (($filterClass [$pos] === '+') === $matched) { 34//解析出过滤器的类名35$filterClass = trim ( substr ( $filterClass, 0, $pos ) ); 36 } else37continue; 38 } 39$filter ['class'] = $filterClass; 40$filter = Yii::createComponent ( $filter ); 41 } 4243if (is_object ( $filter )) { 44$filter->init (); 45$chain->add ( $filter );//list添加过滤器46 } 47 } 48return$chain; 49 } 50publicfunction run() { 51if ($this->offsetExists ( $this->filterIndex )) {//过滤器列表个数不为0 52 //取出过滤器实例53$filter = $this->itemAt ( $this->filterIndex ++ ); 54$filter->filter ( $this ); 55 } else56$this->controller->runAction ( $this->action ); 57 } 58 }

'application.filters.LoginFilter+upload_video' 这种配置会创建CFilter实例。

 1 php  2class CFilter extends CComponent {  3publicfunction filter($filterChain) {  4//前置，后置方法 5if ($this->preFilter ( $filterChain )) {  6$filterChain->run ();  7$this->postFilter ( $filterChain );  8 }  9 } 10//钩子11publicfunction init() { 12 } 13protectedfunction preFilter($filterChain) { 14returntrue; 15 } 16protectedfunction postFilter($filterChain) { 17 } 18 }

然后是上面的CFilterChain::create ( $this, $action, $filters )->run ();中的run(),如果请求被解析成的action是upload_video,yii就会取出LoginFilter实例。

比如我的LoginFilter

 1 php  2class LoginFilter extends CFilter {  3protectedfunction preFilter($filterChain) {  4if (! isset ( $_SESSION )) {  5session_start ();  6 }  7if (isset ( $_SESSION ['user'] ))  8returntrue;  9else { 10setcookie ( "return", Yii::app ()->getRequest ()->getUrl (), time () + 360, '/' ); 11 Yii::app ()->getRequest ()->redirect ( 'http://localhost/youtube/login', true, 302 ); 12returnfalse; 13 } 14 } 15protectedfunction postFilter($filterChain) { 16 } 17} 18 ?>

里面就一个前置和后置，表示对于需要启用过滤器的action方法，分别在执行action方法之前和之后执行自己定义的preFilter,postFilter方法。

然后是$filterChain->run ();这里很容易出错。

其实是再次用CFilterChain里面的run(),注意到里面的$this->filterIndex++,这有点像递归.

如果过滤器要过滤对个action,就像这样去CFilter,然后$filterChain->run ();返回CFilterChain，同时$this->filterIndex++,然后继续$filterChain->run ();。。。。。。

对于我的'application.filters.LoginFilter+upload_video'，只过滤upload_video这一个action,所以当返回CFilterChain时，$this->filterIndex已经变成1了，而过滤器列表只有一个过滤器实例，所以这次就会走$this->controller->runAction ( $this->action );了，这就和没设置过滤器时走的$this->runAction ( $action );一样了。

过滤器分析完后，就是什么数据操作之类的，最后是渲染视图render()。这就太简单了，extract($data),然后在include下视图文件就可以了。

还有forward()方法，就是跳转到另一个controller/action,实质就是返回CWebApplication的runController再来一遍上面分析的过程。

最后附上，裁剪的yii http://files.cnblogs.com/TheViper/framework.zip

以上就介绍了yii框架源码分析(三)，包括了yii框架源码方面的内容，希望对PHP教程有兴趣的朋友有所帮助。