Yii2框架解剖

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