魔都六环

设计模式(13)chain of responsibility模式

 
  • Dec 08, 2016

目的

使多个对象都可以处理请求，从而避免请求发送者和接受者的耦合关系。

Responsibility

实现

abstract class Handler
{
  protected $handler;
  function setSuccessor(Handler $handler){
    $this->handler = $handler;
  }
  public abstract function HandlerRequest();
}

class ConcreteHandler1 extends Handler
{
  
  public function HandlerRequest(){
  //要么自己处理，要么传出去(增加某些条件)
    if($this->handler){
      $this->Handler->HandlerRequest();
    }else{
      echo "do it  Handler1!!";
    }
  }

}
class ConcreteHandler2 extends Handler
{
  
  public function HandlerRequest(){
  //要么自己处理，要么传出去(增加某些条件)
    if($this->handler){
      $this->Handler->HandlerRequest();
    }else{
      echo "do it  Handler2!!";
    }
  }

}
//测试代码
$handler1 = new ConcreteHandler1();
$handler2 = new ConcreteHandler2();

$handler1->HandlerRequest();
$handler1->setSuccessor($handler2);
$handler2->HandlerRequest();
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