php设计模式之责任链模式(ResponsibilityChain)
发表于：2019-08-16 10:36:41浏览：55次
这种模式有另一种称呼：控制链模式。它主要由一系列对于某些命令的处理器构成，每个查询会在处理器构成的责任链中传递，在每个交汇点由处理器判断是否需要对它们进行响应与处理。每次的处理程序会在有处理器处理这些请求时暂停。
```php
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)) {
$this->next->operate();
echo 'Res_A start'."
"; } } } class ResponsibilityB extends Responsibility { public function __construct() {} public function operate(){ if (false == is_null($this->next)) { $this->next->operate(); echo 'Res_B start'; } } } $res_a = new ResponsibilityA(); $res_b = new ResponsibilityB(); $res_a->setNext($res_b); $res_a->operate();//输出：Res_A start ?> ```
"; } } } class ResponsibilityB extends Responsibility { public function __construct() {} public function operate(){ if (false == is_null($this->next)) { $this->next->operate(); echo 'Res_B start'; } } } $res_a = new ResponsibilityA(); $res_b = new ResponsibilityB(); $res_a->setNext($res_b); $res_a->operate();//输出：Res_A start ?> ```
