yii框架源码分析(二)

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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  2abstractclass CApplication extends CModule {  3private$_id;  4private$_basePath;  5abstractpublicfunction processRequest();  6publicfunction __construct($config = null) {  7if (is_string ( $config ))  8$config = require ($config);  9 Yii::setApplication ( $this );//保存整个app实例10if (isset ( $config ['basePath'] )) { 11$this->setBasePath ( $config ['basePath'] ); 12unset ( $config ['basePath'] ); 13 } else14$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$this->init (); 26 } 27protectedfunction registerCoreComponents() { 28$components = array ( 29 'request' => array ( 30 'class' => 'CHttpRequest' 31 ), 32 'urlManager' => array ( 33 'class' => 'CUrlManager' 34 ) 35 ); 3637$this->setComponents ( $components );//父类实现38 } 39publicfunction run() { 40$this->processRequest (); 41 } 42publicfunction getId() { 43if ($this->_id !== null) 44return$this->_id; 45else46return$this->_id = sprintf ( '%x', crc32 ( $this->getBasePath () . $this->name ) ); 47 } 48publicfunction setId($id) { 49$this->_id = $id; 50 } 51publicfunction getBasePath() { 52return$this->_basePath; 53 } 54publicfunction setBasePath($path) { 55if (($this->_basePath = realpath ( $path )) === false || ! is_dir ( $this->_basePath )) 56return; 57 } 58publicfunction getDb() { 59return$this->getComponent ( 'db' );//父类实现60 } 61publicfunction getUrlManager() { 62return$this->getComponent ( 'urlManager' ); 63 } 64publicfunction getController() { 65returnnull; 66 } 67publicfunction getBaseUrl($absolute = false) { 68return$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  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 }

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  2class CUrlManager {  3const GET_FORMAT = 'get';  4public$rules = array ();  5public$urlSuffix = '';  6public$caseSensitive = true;  7public$urlRuleClass = 'CUrlRule';  8private$_urlFormat = self::GET_FORMAT;  9private$_rules = array (); 10private$_baseUrl; 11protectedfunction processRules() { 12//遍历自定义的请求匹配规则13foreach ( $this->rules as$pattern => $route ) { 14//对每一个规则创建CUrlRule实例15$this->_rules [] = $this->createUrlRule ( $route, $pattern ); 16 } 17 } 18protectedfunction createUrlRule($route, $pattern) { 19if (is_array ( $route ) && isset ( $route ['class'] )) 20return$route; 21else { 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 ( $this->urlRuleClass, true ); 24//创建CUrlRule实例25returnnew$urlRuleClass ( $route, $pattern ); 26 } 27 } 28//类似于__construct()29publicfunction init() { 30$this->processRules (); 31 } 32publicfunction parseUrl($request) { 33//获取请求34$rawPathInfo = $request->getPathInfo (); 35$pathInfo = $this->removeUrlSuffix ( $rawPathInfo, $this->urlSuffix ); 36foreach ( $this->_rules as$i => $rule ) { 37if (($r = $rule->parseUrl ( $this, $pathInfo, $rawPathInfo )) !== false) { 38return$r; 39 } 40 } 41return$pathInfo; 42 } 43//解析请求，将请求参数写入$_REQUEST44publicfunction parsePathInfo($pathInfo) { 45if ($pathInfo === '') 46return; 47$segs = explode ( '/', $pathInfo . '/' ); 48$n = count ( $segs ); 49for($i = 0; $i $n