PHP一个类AOP的实现
代码片段(3)[全屏查看所有代码]
1. [代码]核心类
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<?php |
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/** |
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* 包装器(Wrapper).
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* Wrapper是一个AOP_LIKE的实现. 也可以看作监听者模式的实现.
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* 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.
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*
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* 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:
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* unpacking --> teardown --> open --> setup --> packing.
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*
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* 例如调用source->doXX(),各个流程将是:
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* unpacking: 解包. 这是调用任意source的函数都会调用的方法;
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* teardown: 撕掉饰品. 对于Wrapper中的每个Decoration,调用其before()函数;
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* open: 真正调用source->doXX()函数;
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* setup: 重新贴上饰品. 对于Wrapper中的每个Decoration,调用其after()函数;
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* packing: 重新打包. 这是调用任意source的函数都会调用的方法;
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*
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*/
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class Wrapper{
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private $source;
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/**
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* @var bool
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*/
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private $undecorated;
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/**
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* @var array[Decoration]
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*/
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private $decorations=array();
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public function __construct($source){
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$this->source = $source;
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}
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public function __call($name,$parameters){
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$this->unpacking($name,$parameters);
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$this->tearDown($name,$parameters);
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// opening
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if(method_exists($this->source, $name)){
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$retval = call_user_func_array(array($this->source,$name),$parameters);
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}
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$this->setup($retval,$name,$parameters);
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$this->packing($retval,$name,$parameters);
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return $retval;
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}
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public function unpacking($name,$parameters){
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}
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public function packing($name,$parameters){
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}
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public function tearDown($name,$parameters){
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if($this->undecorated){
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return;
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}
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foreach ($this->decorations as $d){
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$d->before($name,$parameters);
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}
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}
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public function setup($retval,$name,$parameters){
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if($this->undecorated){
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return ;
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}
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foreach ($this->decorations as $d){
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$d->after($retval,$name,$parameters);
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}
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}
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public function decarate($decoration){
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$this->decorations[] = $decoration;
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}
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public static function wrap($source){
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// wrap the source
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$wrapperConfig = app()->wrappers[get_class($source)];
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if($wrapperConfig){
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$wrapperClass = $wrapperConfig['class'];
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$wrapper = new $wrapperClass($source);
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foreach ($wrapperConfig['decorations'] as $item){
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$decoration = new $item;
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$wrapper->decarate($decoration);
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}
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}
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return $wrapper?$wrapper:$source;
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}
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} |
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?> |
2. [代码]配置
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'wrappers'=>array(
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'ContentService'=>array(
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'class'=>'ContentWrapper',
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'decorations'=>array(
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'DasaiContentDecoration',
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)
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),
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'AOPWorker'=>array(//for test
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'class'=>'DiagnosisWrapper',
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'decorations'=>array(
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'DasaiDiagnosisDecoration'
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),
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),
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), |
3. [代码]测试代码
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class AOPWorker{
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public function testAOP(){
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Debugger::print_r(
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"\n工人:我要做一大堆操作了
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\n工人:... ...
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\n工人:好了 做完了\n");
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return 'OK';
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}
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} |
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public function testAOP(){// test aop 测试入口
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$aop = Wrapper::wrap(new AOPWorker());
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$aop->testAOP(33347);
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} |
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class DiagnosisWrapper extends Wrapper{
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public function unpacking($name, $parameters){
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echo "\nDiagnosisWrapper:喂,有人调用$name,我要解包了.\n";
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}
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public function packing($retval,$name, $parameters){
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echo "\nDiagnosisWrapper:喂,调用$name,结果为$retval,重新打包好了.\n";
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}
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} |
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class DasaiDiagnosisDecoration extends Decoration {
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public function before($name,$parameters){
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echo "\r\nDasaiDiagnosisDecoration:开始调用$name,已经告诉张三李四了.\n";
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}
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public function after($retval,$name,$parameters){
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echo "\nDasaiDiagnosisDecoration:结束调用$name,告诉霍金和Sheldon了.\n";
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}
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} |
