设计模式专题（二十二） ——享元模式

//1.抽象享元类
abstract class Flyweight{
         public functionexecute($params){}
}
//2.具体享元类--可公用
class FlyweightCommonA{
         private $prop;
         public function__construct($prop){
                   $this->prop= $prop;
         }
         public functionexecute($params){
                   //...A类的处理方式
                   //$this->prop->....
         }
}
class FlyweightCommonB{
         private $prop;
         public function__construct($prop){
                   $this->prop= $prop;
         }
         public functionexecute($params){
                   //...B类的处理方式
                   //$this->prop->....
         }
}
//3.具体享元类--私有
class FlyweightPrivate{
         private $prop;
         public function__construct($prop){
                   $this->prop= $prop;
         }
         public functionexecute($params){
                   //...私有类的处理方式
                   //$this->prop->....
         }
}
//4.享元工厂
class FlyweightFactory{
         private$arrFlyweights;
         //array(array(key=>key,obj=>flyweight),...)形式
         public function__construct(array $flyweights = array()){
                   if(!empty($flyweights)){
                            $this->setFlyweights($flyweights);
                   }else{
                            $this->arrFlyweights= $flyweights;
                   }
         }
         public functionsetFlyweights(array $flyweights){
                   if(empty($flyweights)){
                            return;
                   }
                   foreach($flyweightsas $flyweight){
                            if(!isset($this->arrFlyweights[$flyweight['key']])){
                                     $this->arrFlyweights[$flyweight['key']]
                                               =new $flyweight['obj'];
                            }
                   }
         }
         public functiongetFlyweight($key){
                   if(isset($this->arrFlyweights[$key])){
                            return$this->arrFlyweights[$key];
                   }else{
                            returnnull;
                   }
         }
}
//5.客户端
$fw = new FlyweightFactory(
                   array('key'=>'FlyweightCommonA','obj'=>new FlyweightCommonA())
         );
$fw->setFlyweights(
         array('key'=>'FlyweightCommonB','obj'=>new FlyweightCommonB())
);
$fw->getFlyweight('FlyweightCommonA')->execute(array());