PHP一个类AOP的实现[转及修改]

根据OSC上的@hoohle的代码修改的。 地址：http://www.oschina.net/code/snippet_186535_24755 发现代码在部分地方没讲清楚，自己完善了一些 无 ?php/** * 包装器(Wrapper). * Wrapper是一个AOP_LIKE的实现. 也可以看作监听者模式的实现. * 一个Wrapper报装了

 teardown --> open --> setup --> packing.
 *
 *	例如调用source->doXX(),各个流程将是:
 *	unpacking: 	解包. 这是调用任意source的函数都会调用的方法;
 *	teardown: 	撕掉饰品. 对于Wrapper中的每个Decoration,调用其before()函数;
 *	open: 		真正调用source->doXX()函数;
 *	setup: 		重新贴上饰品. 对于Wrapper中的每个Decoration,调用其after()函数;
 *	packing:	重新打包.  这是调用任意source的函数都会调用的方法;
 *
 */
class Wrapper{
	private $source;

	/**
	 * @var bool
	 */
	private $undecorated;

	/**
	 * @var array[Decoration]
	 */
	private $decorations=array();

	public function __construct($source){
		$this->source = $source;
	}

	public function __call($name,$parameters){
		$this->unpacking($name,$parameters);
		$this->tearDown($name,$parameters);

		//opening
		$retval = $this->opening($name,$parameters);

		$this->setup($retval,$name,$parameters);
		$this->packing($retval,$name,$parameters);

		return $retval;
	}

	public function unpacking($name,$parameters){
	}

	public function packing($name,$parameters){
	}
	
	private function opening($name,$parameters){
		// opening
		if(method_exists($this->source, $name)){
			$retval = call_user_func_array(array($this->source,$name),$parameters);
		}
		
		return $retval;
	}

	public function tearDown($name,$parameters){
		if($this->undecorated){
			return;
		}
		$before='before';
		foreach ($this->decorations as $d){
			if(method_exists($d, $before))
			{ 
				$d->$before($name,$parameters);
			} 
		}
	}

	public function setup($retval,$name,$parameters){
		if($this->undecorated){
			return ;
		}
		$after='after';
		foreach ($this->decorations as $d){
			if(method_exists($d, $after))
			{ 
				$d->$after($retval,$name,$parameters);
			} 
		}
	}

	public function decarate($decoration){
		$this->decorations[] = $decoration;
	}



	public static function wrap($source){
		//  wrap the source
		$wrapperConfig = Aop::app()->wrappers[get_class($source)];
		if($wrapperConfig){
			$wrapperClass = $wrapperConfig['class'];
			$wrapper = new $wrapperClass($source);

			foreach ($wrapperConfig['decorations'] as $item){
				if(class_exists($item)){
					$decoration = new $item;
					$wrapper->decarate($decoration);
				}
			}
		}
		return $wrapper?$wrapper:$source;
	}

}

?>

wrappers=array(
				'ContentService'=>array(
						'class'=>'ContentWrapper',
						'decorations'=>array(
								'DasaiContentDecoration',
						)
				),
				'AOPWorker'=>array(//for test
					'class'=>'DiagnosisWrapper',
					'decorations'=>array(
						'DasaiDiagnosisDecoration'
					),
				),
		);
		
	}
	
	public static function app(){
		return new Aop();
	
	}
}



class AOPWorker{
	public function testAOP(){
		echo '
这里是调用的地方 
';
		return 'OK';
	}

}


class DiagnosisWrapper extends Wrapper{

	public function unpacking($name, $parameters){
		echo "DiagnosisWrapper:喂,有人调用$name,我要解包了.
";
	}


	public function packing($retval,$name, $parameters){
		echo "DiagnosisWrapper:喂,调用$name,结果为$retval,重新打包好了.
";
	}
}



class DasaiDiagnosisDecoration  {
	public function before($name,$parameters){
		echo "DasaiDiagnosisDecoration:开始调用$name , 信息 ：$parameters[0] 已经告诉张三李四了.
";
	}

	public function after($retval,$name,$parameters){
		echo "
DasaiDiagnosisDecoration:结束调用$name,告诉霍金和Sheldon了.
";
	}
}


function testAOP(){// test aop  测试入口
		$aop = Wrapper::wrap(new AOPWorker());
		$aop->testAOP(33347);
}


testAOP();






?>