yii2源码学习笔记(十四），yii2源码学习笔记
Module类是模块和应用类的基类。 yiisoft\yii2\base\Module.php
1 2 /**
3 * @link http://www.yiiframework.com/
4 * @copyright Copyright (c) 2008 Yii Software LLC
5 * @license http://www.yiiframework.com/license/
6 */
7
8 namespace yii\base;
9
10 use Yii;
11 use yii\di\ServiceLocator;
12
13 /**
14 * Module is the base class for module and application classes.
15 * Module是模块和应用类的基类
16 * A module represents a sub-application which contains MVC elements by itself, such as
17 * models, views, controllers, etc.
18 * 模块是一个由模型、视图、控制器等组成的子应用
19 * A module may consist of [[modules|sub-modules]].
20 * 模块内也可以包含模块或子模块
21 * [[components|Components]] may be registered with the module so that they are globally
22 * accessible within the module.
23 * 组件可以注册到模块，以便在模块内全局访问
24 * @property array $aliases List of path aliases to be defined. The array keys are alias names (must start
25 * with '@') and the array values are the corresponding paths or aliases. See [[setAliases()]] for an example.
26 * This property is write-only. 要定义的别名路径数组 只写
27 * @property string $basePath The root directory of the module. 模块的根路径
28 * @property string $controllerPath The directory that contains the controller classes. This property is
29 * read-only. 控制器类的路径 只读
30 * @property string $layoutPath The root directory of layout files. Defaults to "[[viewPath]]/layouts".
31 * 模板路径数组 只读
32 * @property array $modules The modules (indexed by their IDs). 模块数组
33 * @property string $uniqueId The unique ID of the module. This property is read-only.模块的唯一标识 只读
34 * @property string $viewPath The root directory of view files. Defaults to "[[basePath]]/views".
35 * 模块下视图文件路径
36 * @author Qiang Xue
37 * @since 2.0
38 */
39 class Module extends ServiceLocator
40 {
41 /**
42 * @event ActionEvent an event raised before executing a controller action. 在执行控制的的action方法前触发
43 * You may set [[ActionEvent::isValid]] to be false to cancel the action execution.
44 * 可以设置[[ActionEvent::isValid]]为false取消行动的执行。
45 */
46 const EVENT_BEFORE_ACTION = 'beforeAction';
47 /**
48 * @event ActionEvent an event raised after executing a controller action.
49 * 在执行控制的的action方法后触发
50 *
51 */
52 const EVENT_AFTER_ACTION = 'afterAction';
53
54 /**
55 * @var array custom module parameters (name => value). 自定义模块参数
56 */
57 public $params = [];
58 /**
59 * @var string an ID that uniquely identifies this module among other modules which have the same [[module|parent]].
60 * 模块的唯一标识，用于区分同一父模块下的模块
61 */
62 public $id;
63 /**
64 * @var Module the parent module of this module. Null if this module does not have a parent.
65 * 当前模块的父模块
66 */
67 public $module;
68 /**
69 * @var string|boolean the layout that should be applied for views within this module. This refers to a view name
70 * relative to [[layoutPath]]. If this is not set, it means the layout value of the [[module|parent module]]
71 * will be taken. If this is false, layout will be disabled within this module.
72 * 布局文件 如果没有设置，调用 [[module|parent module]]的值。如果是false，在模块中布局将被禁用。
73 */
74 public $layout;
75 /**
76 * @var array mapping from controller ID to controller configurations. 控制器ID到控制器配置的映射
77 * Each name-value pair specifies the configuration of a single controller.
78 * A controller configuration can be either a string or an array.
79 * If the former, the string should be the fully qualified class name of the controller.
80 * If the latter, the array must contain a 'class' element which specifies
81 * the controller's fully qualified class name, and the rest of the name-value pairs
82 * in the array are used to initialize the corresponding controller properties. For example,
83 * 每个键值对指定单独的控制器，控制器配置可以是字符串或者数组，如果是前者，该字符串是指定控制的的全路径
84 95 * 如果是后者，则包含一个‘class’元素指定控制器的全路径，其余的参数用于初始化对应的属性
85 * ~~~
86 * [
87 * 'account' => 'app\controllers\UserController',
88 * 'article' => [
89 * 'class' => 'app\controllers\PostController',
90 * 'pageTitle' => 'something new',
91 * ],
92 * ]
93 * ~~~
94 */
95 public $controllerMap = [];
96 /**
97 * @var string the namespace that controller classes are in. 控制器的命名空间
98 * This namespace will be used to load controller classes by prepending it to the controller
99 * class name.
100 * 命名空间 在控制器类的前面加载控制器类
101 * If not set, it will use the `controllers` sub-namespace under the namespace of this module.
102 * For example, if the namespace of this module is "foo\bar", then the default
103 * controller namespace would be "foo\bar\controllers".
104 * 如果没有设置，默认为当前模块的命名空间加上 `controllers`构成的命名空间
105 119 * 如当前模块的命名空间为"foo\bar"，控制器的默认命名空间为"foo\bar\controllers"
106 * See also the [guide section on autoloading](guide:concept-autoloading) to learn more about
107 * defining namespaces and how classes are loaded.
108 */
109 public $controllerNamespace;
110 /**
111 * @var string the default route of this module. Defaults to 'default'. 当前前模块的默认路由
112 * The route may consist of child module ID, controller ID, and/or action ID.
113 * For example, `help`, `post/create`, `admin/post/create`.
114 * If action ID is not given, it will take the default value as specified in
115 * [[Controller::defaultAction]].
116 * route 可能包含子模块ID，控制器ID，操作ID，如果action ID未给定，会调用[Controller::defaultAction]指定的action
117 */
118 public $defaultRoute = 'default';
119
120 /**
121 * @var string the root directory of the module. 当前模块的根路径
122 */
123 private $_basePath;
124 /**
125 * @var string the root directory that contains view files for this module 当前模块下视图文件的路径
126 */
127 private $_viewPath;
128 /**
129 * @var string the root directory that contains layout view files for this module.
130 * 当前模块下的布局文件路径
131 */
132 private $_layoutPath;
133 /**
134 * @var array child modules of this module 当前模块的子模块数组
135 */
136 private $_modules = [];
137
138
139 /**
140 * Constructor. 构造函数
141 * @param string $id the ID of this module 当前模块的标识
142 * @param Module $parent the parent module (if any) 当前模块的父模块
143 * @param array $config name-value pairs that will be used to initialize the object properties
144 * 配置文件 用于初始化对象属性
145 */
146 public function __construct($id, $parent = null, $config = [])
147 {
148 $this->id = $id; //给当前模块唯一标识
149 $this->module = $parent; //当前模块的父模块
150 parent::__construct($config); //调用父类的配置
151 }
152
153 /**
154 * Returns the currently requested instance of this module class. 取得当前类的实例
155 * If the module class is not currently requested, null will be returned.
156 * 没有当前请求的模块类，将返回null。
157 * This method is provided so that you access the module instance from anywhere within the module.
158 * 可以在模块内的任何地方访问类的实例
159 * @return static|null the currently requested instance of this module class, or null if the module class is not requested.
160 */
161 public static function getInstance()
162 {
163 $class = get_called_class();
164 return isset(Yii::$app->loadedModules[$class]) ? Yii::$app->loadedModules[$class] : null;
165 }
166
167 /**
168 * Sets the currently requested instance of this module class. 设置模块类的当前请求实例。
169 * @param Module|null $instance the currently requested instance of this module class.
170 * If it is null, the instance of the calling class will be removed, if any.
171 * 当前模块类的实例。如果为null，调用类的实例将被删除
172 */
173 public static function setInstance($instance)
174 {
175 if ($instance === null) {//如果没有传入参数，直接unset
176 unset(Yii::$app->loadedModules[get_called_class()]);
177 } else {//将该类和类的实例存入loadedModules数组中
178 Yii::$app->loadedModules[get_class($instance)] = $instance;
179 }
180 }
181
182 /**
183 * Initializes the module.
184 * 初始化模块
185 * This method is called after the module is created and initialized with property values
186 * given in configuration. The default implementation will initialize [[controllerNamespace]]
187 * if it is not set.
188 * 该模块创建和初始化给出的配置 如果没有设置，默认初始化[[controllerNamespace]]
189 * If you override this method, please make sure you call the parent implementation.
190 * 重写确保父类调用
191 */
192 public function init()
193 {
194 if ($this->controllerNamespace === null) {//判断是否为空
195 $class = get_class($this); //获取类名
196 if (($pos = strrpos($class, '\\')) !== false) {
197 $this->controllerNamespace = substr($class, 0, $pos) . '\\controllers'; //取得命名空间
198 }
199 }
200 }
201
202 /**
203 * Returns an ID that uniquely identifies this module among all modules within the current application.
204 * Note that if the module is an application, an empty string will be returned.
205 * 当前应用程序中模块的唯一标识，如果该模块是应用程序返回空字符串
206 * @return string the unique ID of the module.模块的唯一标识
207 */
208 public function getUniqueId()
209 { //如果当前模块有父模块，则返回拼接的标识作为唯一ID，否则只返回当前模块ID
210 return $this->module ? ltrim($this->module->getUniqueId() . '/' . $this->id, '/') : $this->id;
211 }
212
213 /**
214 * Returns the root directory of the module. 返回当前模块的根路径
215 * It defaults to the directory containing the module class file. 默认为包含模块类文件的路径。
216 * @return string the root directory of the module. 当前模块的根路径
217 */
218 public function getBasePath()
219 {
220 if ($this->_basePath === null) {
221 $class = new \ReflectionClass($this); //生成当前类的反射对象
222 $this->_basePath = dirname($class->getFileName());//取得类定义的路径
223 }
224
225 return $this->_basePath;
226 }
227
228 /**
229 * Sets the root directory of the module. 设置当前模块的根路径
230 * This method can only be invoked at the beginning of the constructor. 只在构造函数开始时调用。
231 * @param string $path the root directory of the module. This can be either a directory name or a path alias.
232 * 模块的根目录。可以是一个目录名或路径别名
233 * @throws InvalidParamException if the directory does not exist. 如果路径不存在。抛出异常
234 */
235 public function setBasePath($path)
236 {
237 $path = Yii::getAlias($path);//将路径别名转换为实际路径。
238 $p = realpath($path); //返回绝对路径名
239 if ($p !== false && is_dir($p)) {
240 $this->_basePath = $p;//是目录名且不为false，返回目录名，否则抛出异常
241 } else {
242 throw new InvalidParamException("The directory does not exist: $path");
243 }
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