Application => web\Application => Module => ServiceLocator => Component
index.php
- require vendor/autoload.php
- require Yii.php extends \yii\BaseYii
- Yii::$classMap
- Yii::$container = new yii\di\Container();
- BaseYii 定义全局配置常量
- require web/config.php
- (new yii\web\Application($config))->run();
** 构造方法流程：
— Yii::$app = $this
— preInit工作：
1）设定$config的各种初始值：
$config[‘basePath’]，$config[‘vendorPath’]，$config[‘runtimePath’]，$config[‘timeZone’]，
$config[‘components’]
2）$config[‘components’]主要包含：
a）配置文件
'request'，'cache'， ‘user'，’errorHandler'，’mailer'，’log'，'db’ ，’urlManager'
b）base\Application::coreComponents()
log，view，formatter，i18n，mailer，urlManager，assetManager，security
c）Application::coreComponents()
request, response, session, user, errorHandler
3）DEV环境：
$config[‘bootstrap’] => [‘debug’, ‘gii']
$config[‘modules’] => [‘debug’, ‘gii']
— 注册错误处理模块 registerErrorHandler
$this->set('errorHandler', $config['components']['errorHandler']);
— Component::__construct($config);
1）用$config初始化当前应用对象
Yii::configure($this, $config); // 将config配置中的key=>value导出到$this
a）属性存在，$this->$name = $value
b）属性不存在，走Component::__set()
components => $this->_definitions
modules => $this->_modules
traceLevel、levels
2）执行初始化方法，base\Application::init()
a）$this->state = self::STATE_INIT;
b）Application::bootstrap()
i）获取请求对象，$request = $this->getRequest();
ii）设置别名，@webroot、@web
iii）base\Application::bootstrap()
1）$this->extensions = include('yiisoft/extensions.php')
yii2-swiftmailer、yii2-codeception、yii2-bootstrap、yii2-debug、yii2-gii、yii2-faker
2）如果extensions有别名配置，为extensions设置别名（都有）
3）如果extensions有bootstrap配置，则执行对应的bootstrap()（暂无）
4）如果$this->bootstrap()中的模块实现了BootstrapInterface，则执行对应的bootstrap()
- debug
- 注册事件->EVENT_BEFORE_REQUEST->EVENT_END_BODY->renderToolbar()
- 添加路由规则，/debug
** run方法流程
1）触发事件，EVENT_BEFORE_REQUEST
getView()::on(View::EVENT_END_BODY, [$this, 'renderToolbar'])
2）处理请求，Application::handleRequest()
a）Request::resolve();
i）获取 $route、$params
b）动作执行，Module::runAction($route, $params);
i）创建控制器，Module::createController($route)，生成controller、actionId
ii）控制器动作执行，Controller::runAction($actionId, $params)
1）创建动作，createAction($actionId)
2）Component::beforeAction过滤
$event = new ActionEvent($action);
Component::trigger(self::EVENT_BEFORE_ACTION, $event);
a）Component::ensureBehaviors()
i）获取controller::behaviors()并绑定行为，Component::attachBehaviorInternal
1）ActionFilter::attach($this);
$owner->on(Controller::EVENT_BEFORE_ACTION, [$this, 'beforeFilter']);
2）$this->_behaviors[$name] = $behavior;
3）Controller::beforeAction()
a）$this->trigger(self::EVENT_BEFORE_ACTION, $event);
i）ActionFilter::beforeFilter()
1）AcessControl::beforAction()
a）AccessRule::allows()
b）call_user_func($rule->denyCallback, $rule, $action);
c）call_user_func($this->denyCallback, $rule, $action);
d）$this->denyAccess($user);
yii\web\User::loginRequired() => Yii::$app->getResponse()->redirect($this->loginUrl);
2）注册on(Controller::EVENT_AFTER_ACTION, [$this, 'afterFilter'], null, false);
iii）InlineAction::runWithParams()
a）调用Controller内的action方法，call_user_func_array([$controller, $actionMethod], $args);
b）action方法内执行render等渲染方法
iv）Controller::afterAction
$this->trigger(self::EVENT_AFTER_ACTION, $event);
c）response->data = $result
- response->data = $result
3）触发事件EVENT_AFTER_REQUEST
- $response->send();
4）响应发送到客户端，$response->send();
a）触发事件，EVENT_BEFORE_SEND
b）输出准备工作，Response::prepare()
c）触发事件，EVENT_AFTER_PREPARE
d）发送响应头，Response::sendHeaders()
e）发送响应内容，Response::sendContent()
f）触发事件，EVENT_AFTER_SEND
