PHP一个类AOP的实现_PHP_编程开发_程序员俱乐部

由于项目有一个需求,需要在原来的代码上做一个封装.?由于不想修改原有代码,?查了一下,?PHP没有方便的支持AOP的方法,于是参考了网上一些文章,写了个包装器,?可以在不修改原有代码的基础上为函数添加before和after实现.

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代码片段(3)[全屏查看所有代码]

1.?[代码]核心类?????class="jump_to_code">

monospace !important; font-size: 10pt !important; display: block !important;">01 <?php 02 ? 03 /** 04 ?* 包装器(Wrapper). 05 ?* Wrapper是一个AOP_LIKE的实现. 也可以看作监听者模式的实现. 06 ?* 一个Wrapper报装了一个对象(source). source可以是任意对象(不包括数组及原子类型),甚至是一个Wrapper. 07 ?* 08 ?* 包装器可以任意添加饰品(Decoration).通过Wrapper调用source的函数的流程将是: 09 ?*? unpacking --> teardown --> open --> setup --> packing. 10 ?* 11 ?*? 例如调用source->doXX(),各个流程将是: 12 ?*? unpacking:? 解包. 这是调用任意source的函数都会调用的方法; 13 ?*? teardown:?? 撕掉饰品. 对于Wrapper中的每个Decoration,调用其before()函数; 14 ?*? open:?????? 真正调用source->doXX()函数; 15 ?*? setup:????? 重新贴上饰品. 对于Wrapper中的每个Decoration,调用其after()函数; 16 ?*? packing:??? 重新打包.? 这是调用任意source的函数都会调用的方法; 17 ?* 18 ?*/ 19 class?Wrapper{ 20 ????private?$source; 21 ? 22 ????/** 23 ?????* @var bool 24 ?????*/ 25 ????private?$undecorated; 26 ? 27 ????/** 28 ?????* @var array[Decoration] 29 ?????*/ 30 ????private?$decorations=array(); 31 ? 32 ????public?function?__construct($source){ 33 ????????$this->source =?$source; 34 ????} 35 ? 36 ????public?function?__call($name,$parameters){ 37 ????????$this->unpacking($name,$parameters); 38 ????????$this->tearDown($name,$parameters); 39 ? 40 ????????// opening 41 ????????if(method_exists($this->source,?$name)){ 42 ????????????$retval?= call_user_func_array(array($this->source,$name),$parameters); 43 ????????} 44 ? 45 ????????$this->setup($retval,$name,$parameters); 46 ????????$this->packing($retval,$name,$parameters); 47 ? 48 ????????return?$retval; 49 ????} 50 ? 51 ????public?function?unpacking($name,$parameters){ 52 ????} 53 ? 54 ????public?function?packing($name,$parameters){ 55 ????} 56 ? 57 ????public?function?tearDown($name,$parameters){ 58 ????????if($this->undecorated){ 59 ????????????return; 60 ????????} 61 ????????foreach?($this->decorations?as?$d){ 62 ????????????$d->before($name,$parameters); 63 ????????} 64 ????} 65 ? 66 ????public?function?setup($retval,$name,$parameters){ 67 ????????if($this->undecorated){ 68 ????????????return?; 69 ????????} 70 ????????foreach?($this->decorations?as?$d){ 71 ????????????$d->after($retval,$name,$parameters); 72 ????????} 73 ????} 74 ? 75 ????public?function?decarate($decoration){ 76 ????????$this->decorations[] =?$decoration; 77 ????} 78 ? 79 ? 80 ? 81 ????public?static?function?wrap($source){ 82 ????????//? wrap the source 83 ????????$wrapperConfig?= app()->wrappers[get_class($source)]; 84 ????????if($wrapperConfig){ 85 ????????????$wrapperClass?=?$wrapperConfig['class']; 86 ????????????$wrapper?=?new?$wrapperClass($source); 87 ? 88 ????????????foreach?($wrapperConfig['decorations']?as?$item){ 89 ????????????????$decoration?=?new?$item; 90 ????????????????$wrapper->decarate($decoration); 91 ????????????} 92 ????????} 93 ????????return?$wrapper?$wrapper:$source; 94 ????} 95 ? 96 } 97 ? 98 ?>

2.?[代码]配置?????

01 'wrappers'=>array( 02 ????????'ContentService'=>array( 03 ????????????????'class'=>'ContentWrapper', 04 ????????????????'decorations'=>array( 05 ????????????????????????'DasaiContentDecoration', 06 ????????????????) 07 ????????), 08 ????????'AOPWorker'=>array(//for test 09 ????????????'class'=>'DiagnosisWrapper', 10 ????????????'decorations'=>array( 11 ????????????????'DasaiDiagnosisDecoration' 12 ????????????), 13 ????????), 14 ),

3.?[代码]测试代码?????

01 class?AOPWorker{ 02 ????public?function?testAOP(){ 03 ????????Debugger::print_r( 04 ????????????"\n工人:我要做一大堆操作了 05 ????????????????\n工人:... ... 06 ????????????????\n工人:好了 做完了\n"); 07 ????????return?'OK'; 08 ????} 09 ? 10 } 11 ? 12 ? 13 public?function?testAOP(){// test aop? 测试入口 14 ????????$aop?= Wrapper::wrap(new?AOPWorker()); 15 ????????$aop->testAOP(33347); 16 } 17 ? 18 ? 19 ? 20 class?DiagnosisWrapper?extends?Wrapper{ 21 ? 22 ????public?function?unpacking($name,?$parameters){ 23 ????????echo?"\nDiagnosisWrapper:喂,有人调用$name,我要解包了.\n"; 24 ????} 25 ? 26 ? 27 ????public?function?packing($retval,$name,?$parameters){ 28 ????????echo?"\nDiagnosisWrapper:喂,调用$name,结果为$retval,重新打包好了.\n"; 29 ????} 30 } 31 ? 32 ? 33 ? 34 class?DasaiDiagnosisDecoration?extends?Decoration { 35 ????public?function?before($name,$parameters){ 36 ????????echo?"\r\nDasaiDiagnosisDecoration:开始调用$name,已经告诉张三李四了.\n"; 37 ????} 38 ? 39 ????public?function?after($retval,$name,$parameters){ 40 ????????echo?"\nDasaiDiagnosisDecoration:结束调用$name,告诉霍金和Sheldon了.\n"; 41 ????} 42 }