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上一篇說到CWebApplication中的￥route=$this->getUrlManager ()->parseUrl ($this->getRequest());,得到$route=controler/actionid。
這篇說他後面的$this->runController ( $route );
1 <?php
2 class CWebApplication extends CApplication {
3 public $controllerNamespace;
4 private $_controllerPath;
5 private $_viewPath;
6 private $_systemViewPath;
7 private $_controller;
8 public $controllerMap=array();
9 public function processRequest() {//開始執行請求
10 //獲取urlManager組件，解析請求，得到controller/action這種格式的string,
11 //並且將隱藏參數與請求的參數一一對應，匹配起來，寫入$_REQUEST中
12 $route = $this->getUrlManager ()->parseUrl ($this->getRequest());
13 $this->runController ( $route );
14 }
15 public function getRequest() {//獲取request組件
16 return $this->getComponent ( 'request' );
17 }
18 protected function registerCoreComponents() {//注冊核心組件
19 parent::registerCoreComponents ();
20 }
21 //執行contronller
22 public function runController($route) {
23 if (($ca = $this->createController ( $route )) !== null) {
24 list ( $controller, $actionID ) = $ca;
25 $oldController = $this->_controller;
26 $this->_controller = $controller;
27 $controller->init ();//鉤子,在執行action方法前調用，子類去實現
28 $controller->run ( $actionID );//開始轉入controller類中action方法的執行
29 $this->_controller = $oldController;
30 }
31 }
32 //創建controller類實例,從controller/action這種格式的string中解析出$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 segment
47 {
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 ();//再次獲取urlManager,在上面第一次調用中已經導入。
75 $manager->parsePathInfo ( ( string ) substr ( $pathInfo, $pos + 1 ) );
76 $actionID = substr ( $pathInfo, 0, $pos );
77 return $manager->caseSensitive ? $actionID : strtolower ( $actionID );
78 } else
79 return $pathInfo;
80 }
81 public function getControllerPath() {
82 if ($this->_controllerPath !== null)
83 return $this->_controllerPath;
84 else
85 return $this->_controllerPath = $this->getBasePath () . DIRECTORY_SEPARATOR . 'controllers';
86 }
87 //兩個鉤子,子類去實現
88 public function beforeControllerAction($controller, $action) {
89 return true;
90 }
91 public function afterControllerAction($controller, $action) {
92 }
93 protected function init() {
94 parent::init ();
95 }
96 }
$ca = $this->createController ( $route ))；createController的作用是將$route中的controller和action分離出來，並創建controller實例。
最後返回controller實例和actionid.
然後回到CWebApplication的runController($route),$controller->init ();在controller初始化時執行，這個需要在子類中重寫，比如：
1 class VideoController extends CController {
2 public function init() {
3 $this->db = Yii::app ()->db;
4 }
5 public function actionBroadcast() {
6 $b = $this->db->query ( "", array (1 ) );
7 $this->render ( "u_broadcast", array (
8 'b' => $b [0] ；
9 ) );
10 }
11 }
這樣在VideoController中便可以用$this->db調用db組件了。
$controller->run ( $actionID );轉入Ccontroller.
1 <?php
2 class CController {
3 protected $db;
4 public $defaultAction = 'index';
5 private $_id;
6 private $_action;
7 public function __construct($id, $module = null) {
8 $this->_id = $id;
9 }
10 public function init() {
11 }
12 //過濾方法,子類重寫
13 public function filters() {
14 return array ();
15 }
16 public function run($actionID) {
17 //創建action實例
18 if (($action = $this->createAction ( $actionID )) !== null) {
19 $parent = Yii::app ();
20 if ($parent->beforeControllerAction ( $this, $action )) {
21 $this->runActionWithFilters ( $action, $this->filters () );
22 $parent->afterControllerAction ( $this, $action );
23 }
24 }
25 }
26 public function refresh($terminate = true, $anchor = '') {
27 $this->redirect ( Yii::app ()->getRequest ()->getUrl () . $anchor, $terminate );
28 }
29 public function redirect($url, $terminate = true, $statusCode = 302) {
30 Yii::app ()->getRequest ()->redirect ( $url, $terminate, $statusCode );
31 }
32 //如果controller裡面有filter
33 public function runActionWithFilters($action, $filters) {
34 if (empty ( $filters ))
35 $this->runAction ( $action );
36 else {
37 $priorAction = $this->_action;
38 $this->_action = $action;
39 CFilterChain::create ( $this, $action, $filters )->run ();
40 $this->_action = $priorAction;
41 }
42 }
43 public function runAction($action) {
44 $priorAction = $this->_action;
45 $this->_action = $action;
46 if ($this->beforeAction ( $action )) {
47 if ($action->runWithParams ( $this->getActionParams () ) === false)
48 $this->invalidActionParams ( $action );
49 else
50 $this->afterAction ( $action );
51 }
52 $this->_action = $priorAction;
53 }
54 //渲染視圖
55 public function render($view, $data = array()) {
56 if (isset ( $data ))
57 extract ( $data );
58 include VIEWS_DIR . "/" . $this->_id . "/" . $view . ".php";
59 }
60 public function renderFile($file, $data = array()) {
61 if (isset ( $data ))
62 extract ( $data );
63 include VIEWS_DIR . "/" . $file;
64 }
65 //跳轉到另一個controller/action,不過浏覽器的地址沒有變
66 public function forward($route) {
67 if (strpos ( $route, '/' ) === false)
68 $this->run ( $route );
69 else {
70 //不在同一個controller裡面，重新創建
71 Yii::app ()->runController ( $route );
72 }
73 }
74 public function getActionParams() {
75 return $_GET;
76 }
77 public function createAction($actionID) {
78 if ($actionID === '')
79 $actionID = $this->defaultAction;
80 if (method_exists ( $this, 'action' . $actionID ) && strcasecmp ( $actionID, 's' ))
81 return new CInlineAction ( $this, $actionID );
82 }
83 public function getAction() {
84 return $this->_action;
85 }
86 public function setAction($value) {
87 $this->_action = $value;
88 }
89 public function getId() {
90 return $this->_id;
91 }
92 //兩個鉤子
93 protected function beforeAction($action) {
94 return true;
95 }
96 protected function afterAction($action) {
97 }
98 }
$this->createAction ( $actionID );創建action實例.
然後是runActionWithFilters($action, $filters)；如果沒有filter(),直接runAction($action)。
$action->runWithParams ( $this->getActionParams () ).$action是CInlineAction實例。
1 <?php
2 class CInlineAction extends CAction
3 {
4 //執行該動作
5 public function run()
6 {
7 $method='action'.$this->getId();
8 $this->getController()->$method();
9 }
10 //執行帶提供的請求的參數的動作
11 public function runWithParams($params)
12 {
13 $methodName='action'.$this->getId();//拼接action方法
14 $controller=$this->getController();
15 $method=new ReflectionMethod($controller, $methodName);//反射
16 if($method->getNumberOfParameters()>0)//方法參數個數>0
17 return $this->runWithParamsInternal($controller, $method, $params);
18 else
19 return $controller->$methodName();
20 }
21 }
CAction
1 <?php
2 abstract class CAction extends CComponent
3 {
4 private $_id;
5 private $_controller;
6 public function __construct($controller,$id)
7 {
8 $this->_controller=$controller;
9 $this->_id=$id;
10 }
11 public function getController()
12 {
13 return $this->_controller;
14 }
15 public function getId()
16 {
17 return $this->_id;
18 }
19 //運行帶有請求參數的對象。 這個方法通過CController::runAction()內部調用
20 public function runWithParams($params)
21 {
22 $method=new ReflectionMethod($this, 'run');
23 if($method->getNumberOfParameters()>0)
24 return $this->runWithParamsInternal($this, $method, $params);
25 else
26 return $this->run();
27 }
28 //執行一個帶有命名參數的對象的方法
29 protected function runWithParamsInternal($object, $method, $params)
30 {
31 $ps=array();
32 foreach($method->getParameters() as $i=>$param)
33 {
34 $name=$param->getName();
35 if(isset($params[$name]))
36 {
37 if($param->isArray())
38 $ps[]=is_array($params[$name]) ? $params[$name] : array($params[$name]);
39 elseif(!is_array($params[$name]))
40 $ps[]=$params[$name];
41 else
42 return false;
43 }
44 elseif($param->isDefaultValueAvailable())
45 $ps[]=$param->getDefaultValue();
46 else
47 return false;
48 }
49 $method->invokeArgs($object,$ps);//反射，執行
50 return true;
51 }
52 }
這兩個類都很簡單，就是執行controller類中的action方法。
回到上面的runActionWithFilters($action, $filters)；如果有filter(),CFilterChain::create ( $this, $action, $filters )->run ();
顯然，如果有filter的話必須在執行action方法前，就設置好filter過濾器列表。
CFilterChain就是將類似於'application.filters.LoginFilter+upload_video' 這種配置解析成過濾器鏈。
過濾器鏈的每一項是一個CInlineFilter或CFilter實例。
1 <?php
2 //過濾器列表
3 class CFilterChain extends CList {
4 public $controller;
5 public $action;
6 public $filterIndex = 0;
7 public function __construct($controller, $action) {
8 $this->controller = $controller;
9 $this->action = $action;
10 }
11 //創建過濾器列表
12 public static function create($controller, $action, $filters) {
13 $chain = new CFilterChain ( $controller, $action );
14 $actionID = $action->getId ();
15 foreach ( $filters as $filter ) {
16 if (is_string ( $filter )) // filterName [+|- action1 action2]
17 {
18 if (($pos = strpos ( $filter, '+' )) !== false || ($pos = strpos ( $filter, '-' )) !== false) {
19 $matched = preg_match ( "/\b{$actionID}\b/i", substr ( $filter, $pos + 1 ) ) > 0;
20 if (($filter [$pos] === '+') === $matched)
21 $filter = CInlineFilter::create ( $controller, trim ( substr ( $filter, 0, $pos ) ) );
22 } else
23 $filter = CInlineFilter::create ( $controller, $filter );
24 } elseif (is_array ( $filter )) // array('path.to.class [+|- action1, action2]','param1'=>'value1',...)
25 {
26 $filterClass = $filter [0];
27 unset ( $filter [0] );
28 //開始解析過濾器配置
29 if (($pos = strpos ( $filterClass, '+' )) !== false || ($pos = strpos ( $filterClass, '-' )) !== false) {
30 preg_match ( "/\b{$actionID}\b/i", substr ( $filterClass, $pos + 1 ), $a );
31 $matched = preg_match ( "/\b{$actionID}\b/i", substr ( $filterClass, $pos + 1 ) ) > 0;
32 //如果是filterName+action，創建一個過濾器,否則忽略
33 if (($filterClass [$pos] === '+') === $matched) {
34 //解析出過濾器的類名
35 $filterClass = trim ( substr ( $filterClass, 0, $pos ) );
36 } else
37 continue;
38 }
39 $filter ['class'] = $filterClass;
40 $filter = Yii::createComponent ( $filter );
41 }
42
43 if (is_object ( $filter )) {
44 $filter->init ();
45 $chain->add ( $filter );//list添加過濾器
46 }
47 }
48 return $chain;
49 }
50 public function run() {
51 if ($this->offsetExists ( $this->filterIndex )) {//過濾器列表個數不為0
52 //取出過濾器實例
53 $filter = $this->itemAt ( $this->filterIndex ++ );
54 $filter->filter ( $this );
55 } else
56 $this->controller->runAction ( $this->action );
57 }
58 }
'application.filters.LoginFilter+upload_video' 這種配置會創建CFilter實例。
1 <?php
2 class CFilter extends CComponent {
3 public function filter($filterChain) {
4 //前置，後置方法
5 if ($this->preFilter ( $filterChain )) {
6 $filterChain->run ();
7 $this->postFilter ( $filterChain );
8 }
9 }
10 //鉤子
11 public function init() {
12 }
13 protected function preFilter($filterChain) {
14 return true;
15 }
16 protected function postFilter($filterChain) {
17 }
18 }
然後是上面的CFilterChain::create ( $this, $action, $filters )->run ();中的run(),如果請求被解析成的action是upload_video,yii就會取出LoginFilter實例。
比如我的LoginFilter
1 <?php
2 class LoginFilter extends CFilter {
3 protected function preFilter($filterChain) {
4 if (! isset ( $_SESSION )) {
5 session_start ();
6 }
7 if (isset ( $_SESSION ['user'] ))
8 return true;
9 else {
10 setcookie ( "return", Yii::app ()->getRequest ()->getUrl (), time () + 360, '/' );
11 Yii::app ()->getRequest ()->redirect ( 'http://localhost/youtube/login', true, 302 );
12 return false;
13 }
14 }
15 protected function postFilter($filterChain) {
16 }
17 }
18 ?>
裡面就一個前置和後置，表示對於需要啟用過濾器的action方法，分別在執行action方法之前和之後執行自己定義的preFilter,postFilter方法。
然後是$filterChain->run ();這裡很容易出錯。
其實是再次用CFilterChain裡面的run(),注意到裡面的$this->filterIndex++,這有點像遞歸.
如果過濾器要過濾對個action,就像這樣去CFilter,然後$filterChain->run ();返回CFilterChain，同時$this->filterIndex++,然後繼續$filterChain->run ();。。。。。。
對於我的'application.filters.LoginFilter+upload_video'，只過濾upload_video這一個action,所以當返回CFilterChain時，$this->filterIndex已經變成1了，而過濾器列表只有一個過濾器實例，所以這次就會走$this->controller->runAction ( $this->action );了，這就和沒設置過濾器時走的$this->runAction ( $action );一樣了。
過濾器分析完後，就是什麼數據操作之類的，最後是渲染視圖render()。這就太簡單了，extract($data),然後在include下視圖文件就可以了。
還有forward()方法，就是跳轉到另一個controller/action,實質就是返回CWebApplication的runController再來一遍上面分析的過程。
最後附上，裁剪的yii http://files.cnblogs.com/TheViper/framework.zip
