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PHP面向切面编程组件

Jun 13, 2016 am 10:46 AM
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我们使用MVC框架,例如CI、YII、cakePHP,原因之一就是:能够使代码便于维护。

但当业务逻辑不断复杂时,在控制器中调用模型中的方法会越来越臃肿。

面向切面编程的思路,是解决不断变化的业务逻辑与写出便于维护代码的解决方法之一。

 


下面是向切面式组件源码,是根据AOP的思路设计的。

 

 

if (function_exists('__autoload')) { 
    trigger_error("Extension: It looks like your code is using an __autoload() function. Extension uses spl_autoload_register() which will bypass your __autoload() function and may break autoloading.", E_USER_WARNING); 

 
spl_autoload_register(array('ExtensionFactory', 'autoload')); 
 
class ExtensionFactory { 
     
    private static $extFamily = null; 
    private static $_classes = array( 
        'Extension' =>  '/Extension.php', 
        'ExtensionFamily' =>  '/ExtensionFamily.php' 
    ); 
     
    /**
     * Class autoloader. This method is provided to be invoked within an 
     * __autoload() magic method.
     * @param string $className The name of the class to load.
     */ 
    public static function autoload() { 
        foreach(self::$_classes as $v){ 
            require_once dirname(__FILE__) . $v; 
        } 
    } 
     
    /**
     * 必须先调用此方法来实例化扩展族,才能调用addExtension\removeExtension等
     * @return ExtensionFamily
     */ 
    public static function createExtension(){ 
        self::$extFamily = new ExtensionFamily(); 
        return self::$extFamily; 
    } 
     
    public static function removeExtension($extName){ 
        if(is_null(self::$extFamily)){ 
            throw new Exception("Please createExtension first"); 
            return false; 
        }else{ 
            unset(self::$extFamily->_extensionArray[$extName]); 
        } 
    } 
     
    public static function addExtension($extName, Extension $ext){ 
        if(is_null(self::$extFamily)){ 
            throw new Exception("Please createExtension first"); 
            return false; 
        }else{ 
            self::$extFamily->_extensionArray[$extName] = $ext; 
        } 
    } 
     
    public static function removeAllExtension(){ 
        if(is_null(self::$extFamily)){ 
            throw new Exception("Please createExtension first"); 
            return false; 
        }else{ 
            foreach(self::$extFamily->_extensionArray as $extName=>$ext){ 
                unset(self::$extFamily->_extensionArray[$extName]); 
            } 
        } 
    } 

if (function_exists('__autoload')) {
 trigger_error("Extension: It looks like your code is using an __autoload() function. Extension uses spl_autoload_register() which will bypass your __autoload() function and may break autoloading.", E_USER_WARNING);
}

spl_autoload_register(array('ExtensionFactory', 'autoload'));

class ExtensionFactory {
   
    private static $extFamily = null;
    private static $_classes = array(
        'Extension' =>  '/Extension.php',
        'ExtensionFamily' =>  '/ExtensionFamily.php'
    );
   
    /**
     * Class autoloader. This method is provided to be invoked within an
     * __autoload() magic method.
     * @param string $className The name of the class to load.
     */
    public static function autoload() {
        foreach(self::$_classes as $v){
            require_once dirname(__FILE__) . $v;
        }
    }
   
    /**
     * 必须先调用此方法来实例化扩展族,才能调用addExtension\removeExtension等
     * @return ExtensionFamily
     */
    public static function createExtension(){
        self::$extFamily = new ExtensionFamily();
        return self::$extFamily;
    }
   
    public static function removeExtension($extName){
        if(is_null(self::$extFamily)){
            throw new Exception("Please createExtension first");
            return false;
        }else{
            unset(self::$extFamily->_extensionArray[$extName]);
        }
    }
   
    public static function addExtension($extName, Extension $ext){
        if(is_null(self::$extFamily)){
            throw new Exception("Please createExtension first");
            return false;
        }else{
            self::$extFamily->_extensionArray[$extName] = $ext;
        }
    }
   
    public static function removeAllExtension(){
        if(is_null(self::$extFamily)){
            throw new Exception("Please createExtension first");
            return false;
        }else{
            foreach(self::$extFamily->_extensionArray as $extName=>$ext){
                unset(self::$extFamily->_extensionArray[$extName]);
            }
        }
    }
}

 


/**
 * 扩展家族
 *
 * @author Mr.Jin
 */ 
class ExtensionFamily implements Extension{ 
    public $_extensionArray = array(); 
     
    /**
     *
     * @param type $extName 扩展名
     * @param Extension $ext 实现Extension的对象
     */ 
    public function addExtension($extName, Extension $ext){ 
        $this->_extensionArray[$extName] = $ext; 
    } 
     
    public function beforeAppend(&$params){ 
        foreach($this->_extensionArray as $ext){ 
            $ext->beforeAppend($params); 
        } 
    } 
     
    public function afterAppend(&$params) { 
        foreach($this->_extensionArray as $ext){ 
            $ext->afterAppend($params); 
        } 
    } 

 
?> 
/**
 * 扩展家族
 *
 * @author Mr.Jin
 */
class ExtensionFamily implements Extension{
    public $_extensionArray = array();
   
    /**
     *
     * @param type $extName 扩展名
     * @param Extension $ext 实现Extension的对象
     */
    public function addExtension($extName, Extension $ext){
        $this->_extensionArray[$extName] = $ext;
    }
   
    public function beforeAppend(&$params){
        foreach($this->_extensionArray as $ext){
            $ext->beforeAppend($params);
        }
    }
   
    public function afterAppend(&$params) {
        foreach($this->_extensionArray as $ext){
            $ext->afterAppend($params);
        }
    }
}

?>

/**
 * 扩展接口
 *
 * @author Mr.Jin
 */ 
interface Extension { 
    public function beforeAppend(&$params); 
     
    public function afterAppend(&$params); 

 
?> 
/**
 * 扩展接口
 *
 * @author Mr.Jin
 */
interface Extension {
    public function beforeAppend(&$params);
   
    public function afterAppend(&$params);
}

?>

以上三个文件实现了简单的AOP组件。

 

下面是Demo:

/**
 * 自定义Extension
 * 用户积分Extension
 * 根据用户是否登录,决定此次消费是否记录用户积分
 *
 * @author Mr.Jin
 */ 
class ExampleExtension implements Extension { 
    public $check=false; 
     
    public function beforeAppend(&$isLogin) { 
        if($isLogin){ 
            $this->check = true; 
        } 
    } 
     
    public function afterAppend(&$pointer) { 
        if($this->check){ 
            //add pointer  
        }else{ 
            echo '未登录用户,积分不录入'; 
            return; 
        } 
    } 
 

 
?> 
/**
 * 自定义Extension
 * 用户积分Extension
 * 根据用户是否登录,决定此次消费是否记录用户积分
 *
 * @author Mr.Jin
 */
class ExampleExtension implements Extension {
 public $check=false;
   
    public function beforeAppend(&$isLogin) {
        if($isLogin){
         $this->check = true;
        }
    }
   
    public function afterAppend(&$pointer) {
        if($this->check){
         //add pointer
        }else{
         echo '未登录用户,积分不录入';
         return;
        }
    }

}

?>

 


demo.php
require_once('ExtensionFactory.php');//导入组件本身  
 
require_once('ExampleExtension.php');//导入扩展  
 
$ext = ExtensionFactory::createExtension(); 
 
ExtensionFactory::addExtension('example', new ExampleExtension());//积分录入功能  
 
/*
 * 按照需求的变化,可以增加相应的Extension.
 * eg.
 * 新需求:新增会员类型,根据不同类型,进行价格优惠。
 * 实现思路:
 * 一、建立卡号类型工厂
 * 二、建立SeniorMemberExtension、PuTongMeberExtension.
 * 三、工厂方法根据会员类型addExtension
 */ 
 
$isLogin = false; //假设用户未登录  
 
$ext->beforeAppend($isLogin); 
 
 
/**
 * 面向切面编程,最重要一点是:必须先分析出整个业务处理中,哪个才是重点。
 * 这里的重点是订单的入库。
 * 在订单入库之前可能业务逻辑不断增加,例如:登录验证、卡上余额验证等
 * 在订单入库之后:积分处理、订单监控等
 */ 
echo "此处是主要业务逻辑:订单入库\r\n"; 
 
$pointer = 100; 
 
$ext->afterAppend($pointer); 
require_once('ExtensionFactory.php');//导入组件本身

require_once('ExampleExtension.php');//导入扩展

$ext = ExtensionFactory::createExtension();

ExtensionFactory::addExtension('example', new ExampleExtension());//积分录入功能

/*
 * 按照需求的变化,可以增加相应的Extension.
 * eg.
 * 新需求:新增会员类型,根据不同类型,进行价格优惠。
 * 实现思路:
 * 一、建立卡号类型工厂
 * 二、建立SeniorMemberExtension、PuTongMeberExtension.
 * 三、工厂方法根据会员类型addExtension
 */

$isLogin = false; //假设用户未登录

$ext->beforeAppend($isLogin);


/**
 * 面向切面编程,最重要一点是:必须先分析出整个业务处理中,哪个才是重点。
 * 这里的重点是订单的入库。
 * 在订单入库之前可能业务逻辑不断增加,例如:登录验证、卡上余额验证等
 * 在订单入库之后:积分处理、订单监控等
 */
echo "此处是主要业务逻辑:订单入库\r\n";

$pointer = 100;

$ext->afterAppend($pointer);
运行结果:
此处是主要业务逻辑:订单入库
未登录用户,积分不录入

 摘自 God's blog

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