path:framework/base/interfaces.php
overview:This file contains core interfaces for Yii framework.
interface IApplicationComponent:all application components must implement。
在application完成配置后就调用init()初始化application。
interface ICache：must be implemented by cache components。
interface ICacheDependency：must be implemented by cache dependency classes.
interface IStatePersister：must be implemented by state persister classes.
interface IFilter：must be implemented by action filters.
interface IAction：must be implemented by controller actions.
interface IWebServiceProvider：may be implemented by Web service provider classes.
interface IViewRenderer：is implemented by a view renderer class.
interface IUserIdentity：is implemented by a user identity class.
interface IWebUser：is implemented by a user application component}.
interface IAuthManager：is implemented by an auth manager application component.
interface IBehavior：is implemented by all behavior classes.
interface IWidgetFactory：must be implemented by a widget factory class.
interface IDataProvider：must be implemented by data provider classes.
interface ILogFilter：must be implemented by log filters.