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PHP 框架 Yaf 学习札记-默认行为

Jun 13, 2016 pm 01:07 PM
application controller php yaf

PHP 框架 Yaf 学习笔记----默认行为

Yaf是一个C语言编写的PHP框架,以php扩展的形式. 是 laruence(鸟哥)? 的作品


laruence 是PHP 开发组成员, PECL 开发者. Yaf, Taint等Pecl扩展作者.


Yaf 相关文章 http://www.laruence.com/tag/yaf? ? 在线手册


在线手册系统完整的阐述了Yaf的一切,这里作为学习导读,列出Yaf的默认行为(契约)


0.Yaf 配置文件(php.ini风格)

其实分两部分,一个是php.ini中的配置 "yaf." 开头,这部分通常是不用调整的。

另一部分是Yaf_Application初始化时刻的配置 "application." 开头

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配置可以引入php常量定义


1.Yaf 的必须配置,其实就是个目录设定

yaf.directory=APP_PATH
application.directory=APP_PATH
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也就是 appliction 脚本目录,至少要定义一个,application.directory优先


2.Yaf 有一套完整的目录组织,文件命名规则

所有Yaf应用都应该遵循下面的目录组织结构

- index.php //入口文件
- .htaccess //重写规则    
+ conf
  |- application.ini //配置文件   
application/
  + controllers
     - Index.php //默认控制器
  + views    
     |+ index   //控制器
        - index.phtml //默认视图
  + modules //其他模块
  - library
  - models  //model目录
  - plugins //插件目录
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Yaf支持大小写敏感和不敏感两种方式,但是我没有找到大小写敏感的用法(linux环境)
类命名和搜索规则
类名称???????????? 对应目录
ClassModel????? models
ClassPlugin????? plugins
ClassController controllers
其他??????????????? library


3.Yaf 是通过以包含分隔符"_"的类名称配合目录组织,和完整的类命名规则完成类加载管理

比如以前你有一个Bar类文件Bar.php,如果用到Yaf里,并自动加载,那么就要这样组织

把Bar.php放到library目录下的一个子目录里面,比如 myclass

并且要更改Bar.php里面的类名(一般都是Bar的)为MyClass_Bar

也就是说类名必须包含目录名 具体解释


4.错误处理

Yaf里面错误处理可以通过一个控制器完成,声明在 APP_PATH/controllers/Error.php 里

class ErrorController extends Yaf_Controller_Abstract {...} 
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当然错误控制器是否生效受配置影响

application.dispatcher.throwException=1
application.dispatcher.catchException=1
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具体看 官方提供的例子


5.视图view

render视图需要指定视图模板文件,可以用相对(application/views)路径或者绝对路径


6.路由

Yaf提供了多种级别的路径支持,正则路由也有支持,你可以用配置文件写路由,或者在Bootstrap.php里面用php脚本写路由


个人认为Yaf最吸引人的地方是:

PHP Framework in PHP extension,如果没有数据库访问的瓶颈造成的木桶效应,Yaf这种形式是最优的

使用Yaf后在某种级别的应用中内存占用应该降低很多

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7.BUG?发现如下问题,不知道是否是bug

Yaf在匹配配置文件的节(section)的时候,不是对名称完全匹配,比如配置里面有

[product]
...
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new Yaf_Application("conf/app.ini",'p')//照样可以被匹配到
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8.MVC

Yaf和大多数框架一样提供了一个默认的MVC行为,对于M(setDefaultModule)我没有找到更改生效的方法。
C和V是一一对应的,当然可以名称不同,可以通过Yaf_Dispatcher的setView方法进行设置。

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9.单例模式类,Yaf中

Yaf_Application
Yaf_Loader
Yaf_Dispatcher
Yaf_Registry
Yaf_Session
类实例
是单例,其他不是
需要注意如果在Yaf_Controller_Abstract继承类action中使用了forward,那将会产生新的实例对象。

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10.非嵌套Dispatcher(2.x版本以下)

Yaf对请求的处理是非嵌套的,这意味着所有对 Controller转移都是非嵌套的,如果一个Controller没有执行完,发生了转移,那有可能发生不可知的结果甚至错误,Yaf提供的 forward是等待当前Controller执行完毕才处理的,因此如果完全按照MVC的方式对请求进行处理,要达到嵌套处理的效果,需要自己实现代码.流程对应说明

mainloopstart
  dispatchLoopStartup
     preDispatch//其实是个循环受forward控制
          这之间request不能发送改变,可以forward但是会被延期执行
     postDispatch
     forward的request延期执行,循环到preDispatch
  dispatchLoopShutdown
  可以dispatch一个新的request,会开始新的dispatchLoopStartup
mainloopend
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