常用设计模式之责任链模式及其php实现

主要角色

抽象责任(Responsibility）角色：定义所有责任支持的公共方法。

具体责任(Concrete Responsibility)角色：以抽象责任接口实现的具体责任

责任链(Chain of responsibility)角色：设定责任的调用规则

类图

实例

<?php
abstract class Responsibility { // 抽象责任角色
    protected $next; // 下一个责任角色
 
    public function setNext(Responsibility $l) {
        $this->next = $l;
        return $this;
    }
    abstract public function operate(); // 操作方法
}
 
class ResponsibilityA extends Responsibility {
    public function __construct() {}
    public function operate(){
        if (false == is_null($this->next)) {
            $this->next->operate();
        }
    };
}
class ResponsibilityB extends Responsibility {
    public function __construct() {}
    public function operate(){
        if (false == is_null($this->next)) {
            $this->next->operate();
        }
    };
}
 
$res_a = new ResponsibilityA();
$res_b = new ResponsibilityB();
$res_a->setNext($res_b);
?>