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[PHP]设计模式 五 责任链模式

  • 2026-04-16 07:06:34
[PHP]设计模式 五 责任链模式

PHP设计模式 五

责任链模式

责任链模式,见名知意,流程是链式,通过链式的流程处理请求。

事务A/权限=1事务B/权限=2事务C/权限=3处理权限=3的事情,通过链式找到对应事务,将请求对象和接受对象解除耦合关系。沿着链式关系传递请求,直到请求被处理。事务A->事务B->事务C

应用范围

框架

  • Web 框架的中间件/过滤器/拦截器:如 Express/Koa 的中间件栈、Spring MVC 的 Filter 和 Interceptor、ASP.NET Core 的中间件管道。每个中间件可以决定处理请求、终止链、或传递给下一个。

  • HTTP 客户端拦截器:如vue3路由守卫,用于权限控制,或者是指对 HTTP 请求进行拦截处理(如 token 添加、错误处理),最后会返回next()。

  • 安全框架:Spring Security 通过一系列 Filter组成安全过滤器链,依次处理认证、授权、CSRF 防护等。

  • 事件处理系统:GUI 编程中的事件冒泡,如浏览器 DOM 事件从目标元素逐级冒泡到 document;Android 的 View 事件分发机制(dispatchTouchEvent → onInterceptTouchEvent → onTouchEvent)也是职责链的变体。

业务逻辑

  • 多级审批流程:如 OA 系统中的请假审批(组长 → 经理 → 总监 → 总经理),报销审批、合同审批等。每级审批人是一个处理节点,可以批准、拒绝或转交。

  • 工作流引擎:在复杂的工作流系统中,任务按预定顺序(链)在多个处理者间流转,每个节点执行特定业务操作或人工审批。

  • 风控与审核:如内容审核系统(机器初审 → 敏感词过滤 → 人工复审 → 终审),每个节点对内容进行不同维度的检查。

数据处理

  • 数据清洗与转换:ETL 流程中,一条数据依次经过“格式校验 → 缺失值填充 → 类型转换 → 脱敏处理”等一系列处理器。

  • 参数校验与预处理:API 入口处,对输入参数进行链式校验:非空校验 → 格式校验(邮箱/手机号)→ 业务规则校验(如库存是否充足)。

  • 规则引擎:一组业务规则形成链,按优先级依次匹配。例如电商促销规则:先检查是否满足满减门槛 → 再检查是否可用优惠券 → 最后检查是否享受会员折扣,任一规则匹配后可能终止或继续组合。

动态算法与策略选择

  • 支付渠道路由:根据订单金额、用户偏好、渠道可用性等因素,依次尝试支付渠道:余额支付 → 银行卡 → 第三方支付(微信/支付宝),直到成功。

  • 服务降级与熔断:在微服务调用中,形成降级链:优先尝试主服务 → 失败则尝试备用服务 → 再失败则返回本地缓存数据。

  • 资源加载策略:如缓存加载:一级缓存(本地)→ 二级缓存(Redis)→ 数据库。任一层次命中则返回,否则继续向下。

游戏开发

  • 伤害计算链:攻击命中后,依次经过“护甲减免 → 抗性减免 → 护盾吸收 → 最终伤害结算”等多个处理环节,每个环节可以修改伤害值。

  • 技能效果链:一个技能触发后,可能附带多个效果:造成伤害 → 附加 debuff → 触发连击 → 回复自身生命值,这些效果可以组织成一条链顺序执行。

  • UI 事件穿透:处理点击事件时,从最上层 UI 元素向下或向上传递,直到有控件消费该事件。

代码实现

抽象类

abstractclassHandler{private $nextHandler;publicfunctionsetNext(Handler $nextHandler){$this->nextHandler = $nextHandler;    }publicfunctionnext(){$this->nextHandler->handlerRequest();    }abstractpublicfunctionhandlerRequest(){}   }

实现类

//校验authclassCheckAuthHandlerextendsHandler{  publicfunctionhandlerRequest(){        $request = request();        $token = $request->header("token");//校验token        $checkAuth = $this->checkAuth();if(empty($checkAuth)){thrownew RequestException("token错误");        }return$this->next();    }  }
//校验权限classCheckPermissionHandlerextendsHandler{publicfunctionhandlerRequest(){        $request = request();        $token = $request->header("token");//校验token        $checkPermission = $this->checkPermission();if(empty($checkPermission)){thrownew RequestException("用户无权限");        }return$this->next();    }  }

基础控制器

classControllerextendsHandler{publicfunctionhandlerRequest(){        $request = request();$this->doController($request);    }   }

控制器类

//文章类classArticleControllerextendsController(){publicfunctiondeleteArticle(){//删除文章    }  }

实际调用

//设置链式调用顺序  $handlers = ["CheckAuthHandler::class","CheckPermissionHandler::class",  ];//构建链式结构  $lastHandler = null;for($i=1;$i++;$i<count($handlers)){    $handler1 = $handlers[$i-1];    $handler2 = $handlers[$i];    $handler1->setNext($handler2);    $lastHandler = $handler2;  }//保证链式结构最后是controller  $controller = new Controller();  $handler2->setNext($controller);

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  1. CONNECT:[ UseTime:0.000623s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000780s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000310s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000273s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000657s ]
  6. SELECT * FROM `set` [ RunTime:0.000241s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000743s ]
  8. SELECT * FROM `article` WHERE `id` = 484081 LIMIT 1 [ RunTime:0.000787s ]
  9. UPDATE `article` SET `lasttime` = 1776317554 WHERE `id` = 484081 [ RunTime:0.002923s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000281s ]
  11. SELECT * FROM `article` WHERE `id` < 484081 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000577s ]
  12. SELECT * FROM `article` WHERE `id` > 484081 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000390s ]
  13. SELECT * FROM `article` WHERE `id` < 484081 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000679s ]
  14. SELECT * FROM `article` WHERE `id` < 484081 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001028s ]
  15. SELECT * FROM `article` WHERE `id` < 484081 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003096s ]
0.108617s