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上一篇主要分析了Yii::createWebapplication ( $config )->run ();的createWebApplication ( $config )部分，这篇分析后面的。

run()也是不在CWebApplication里面，在CApplication 里。

 1 <?php 2 abstract class CApplication extends CModule { 3     PRivate $_id; 4     private $_basePath; 5     abstract public function processRequest(); 6     public function __construct($config = null) { 7         if (is_string ( $config )) 8             $config = require ($config); 9         Yii::setApplication ( $this );//保存整个app实例10         if (isset ( $config ['basePath'] )) {11             $this->setBasePath ( $config ['basePath'] );12             unset ( $config ['basePath'] );13         } else14             $this->setBasePath ( 'protected' );15         //设置别名,后面就可以用application表示basePath了16         Yii::setPathOfAlias ( 'application', $this->getBasePath () );17         //钩子，模块 预 初始化时执行，子类实现。不过这时，配置还没有写入框架18         $this->preinit ();19         $this->registerCoreComponents ();20         //父类实现21         $this->configure ( $config );22         //加载静态应用组件23         $this->preloadComponents ();24         //这才开始初始化模块25         $this->init ();26     }27     protected function registerCoreComponents() {28         $components = array (29                 'request' => array (30                         'class' => 'CHttpRequest'31                 ),32                 'urlManager' => array (33                         'class' => 'CUrlManager'34                 )35         );36 37         $this->setComponents ( $components );//父类实现38     }39     public function run() {40         $this->processRequest ();41     }42     public function getId() {43         if ($this->_id !== null)44             return $this->_id;45         else46             return $this->_id = sprintf ( '%x', crc32 ( $this->getBasePath () . $this->name ) );47     }48     public function setId($id) {49         $this->_id = $id;50     }51     public function getBasePath() {52         return $this->_basePath;53     }54     public function setBasePath($path) {55         if (($this->_basePath = realpath ( $path )) === false || ! is_dir ( $this->_basePath ))56             return;57     }58     public function getDb() {59         return $this->getComponent ( 'db' );//父类实现60     }61     public function getUrlManager() {62         return $this->getComponent ( 'urlManager' );63     }64     public function getController() {65         return null;66     }67     public function getBaseUrl($absolute = false) {68         return $this->getRequest ()->getBaseUrl ( $absolute );69     }70 }

run()又用了CWebApplication里面的processRequest()。薛强大哥（yii作者），架构要不要这样啊.裁剪后当然觉得这样的调用很没意思。

后面的主要在CWebApplication里了。

 1 <?php 2 class CWebApplication extends CApplication { 3     public $controllerNamespace; 4     private $_controllerPath; 5     private $_viewPath; 6     private $_systemViewPath; 7     private $_controller; 8     public $controllerMap=array(); 9     public function processRequest() {//开始执行请求10         //获取urlManager组件，解析请求，得到controller/action这种格式的string,11         //并且将隐藏参数与请求的参数一一对应，匹配起来，写入$_REQUEST中12         $route = $this->getUrlManager ()->parseUrl ($this->getRequest());13         $this->runController ( $route );14     }15     public function getRequest() {//获取request组件16         return $this->getComponent ( 'request' );17     }18     protected function registerCoreComponents() {//注册核心组件19         parent::registerCoreComponents ();20     }21     //执行contronller22     public function runController($route) {23         if (($ca = $this->createController ( $route )) !== null) {24             list ( $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, $actionID 33     public function createController($route, $owner = null) {34         if ($owner === null)35             $owner = $this;36         if (($route = trim ( $route, '/' )) === '')37             $route = $owner->defaultController;38 39         $route .= '/';40         while ( ($pos = strpos ( $route, '/' )) !== false ) {41             $id = substr ( $route, 0, $pos );42             if (! preg_match ( '/^\w+$/', $id ))43                 return null;44             $id = strtolower ( $id );45             $route = ( string ) substr ( $route, $pos + 1 );46             if (! 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';55 56             if (is_file ( $classFile )) {57                 if (! class_exists ( $className, false ))58                     require ($classFile);59                 if (class_exists ( $className, false ) && is_subclass_of ( $className, 'CController' )) {60                     $id [0] = strtolower ( $id [0] );61                     return array (62                             new $className ( $controllerID . $id, $owner === $this ? null : $owner ),63                             $this->parseActionParams ( $route )64                     );65                 }66                 return null;67             }68             $controllerID .= $id;69             $basePath .= DIRECTORY_SEPARATOR . $id;70         }71     }72     protected function parseActionParams($pathInfo) {73         if (($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 );77             return $manager->caseSensitive ? $actionID : strtolower ( $actionID );78         } else79             return $pathInfo;80     }81     public function getControllerPath() {82         if ($this->_controllerPath !== null)83             return $this->_controllerPath;84         else85             return $this->_controllerPath = $this->getBasePath () . DIRECTORY_SEPARATOR . 'controllers';86     }87     //两个钩子,子类去实现88     public function beforeControllerAction($controller, $action) {89         return true;90     }91     public function afterControllerAction($controller, $action) {92     }93     protected function init() {94         parent::init ();95     }96 }

对于$this->getUrlManager ()，YiiBase里面有'CUrlManager' => 'CUrlManager.php'这个映射，说明是实例化了CUrlManager这个类。

 1 <?php 2 class CUrlManager { 3     const GET_FORMAT = 'get'; 4     public $rules = array (); 5     public $urlSuffix = ''; 6     public $caseSensitive = true; 7     public $urlRuleClass = 'CUrlRule'; 8     private $_urlFormat = self::GET_FORMAT; 9     private $_rules = array ();10     private $_baseUrl;11     protected function processRules() {12         //遍历自定义的请求匹配规则13         foreach ( $this->rules as $pattern => $route ) {14             //对每一个规则创建CUrlRule实例15             $this->_rules [] = $this->createUrlRule ( $route, $pattern );16         }17     }18     protected function createUrlRule($route, $pattern) {19         if (is_array ( $route ) && isset ( $route ['class'] ))20             return $route;21         else {22             //import第二个参数表示是否立即包含类文件。 如果为flase，则类文件仅在被使用时包含。 这个参数仅当使用一个类的路径 别名 时才会用到23             $urlRuleClass = Yii::import ( $this->urlRuleClass, true );24             //创建CUrlRule实例25             return new $urlRuleClass ( $route, $pattern );26         }27     }28     //类似于__construct()29     public function init() {30         $this->processRules ();31     }32     public fu