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‎chapter24.md

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### 第二十四章 加薪非要老总批 －－－ 职责链模式
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```php
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abstract class Handler
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{
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protected $successor;
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//设置继承者
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public function setSuccessor(Handler $successor)
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{
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$this->successor = $successor;
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}
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//处理请求的抽象方法
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abstract function handleRequest(int $request);
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}
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//如果可以处理请求，就处理之，否者转发给它的后继者
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class ConcreteHandler1 extends Handler
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{
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public function handleRequest(int $request)
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{
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if ($request >=0 && $request < 10)
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{
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echo "ConcreteHandler1 handle it\n";
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} else if ($this->successor != null) {
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// 转移
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$this->successor->handleRequest($request);
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}
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}
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}
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class ConcreteHandler2 extends Handler
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{
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public function handleRequest(int $request)
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{
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if ($request >=10 && $request < 20)
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{
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echo "ConcreteHandler2 handle it\n";
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} else if ($this->successor != null) {
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$this->successor->handleRequest($request);
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}
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}
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}
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// client
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$h1 = new ConcreteHandler1();
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$h2 = new ConcreteHandler2();
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设置职责链上下家
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$h1->setSuccessor($h2);
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$requests = [1,5,7,16,25];
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循环给最小处理者提交请求，不同的数额，由不同权限处理者处理
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foreach ($requests as $value) {
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$h1->handleRequest($value);
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}
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```
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总结
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> ***职责链模式***， 使多个对象都有机会处理请求，从而避免请求的发送者和接受者之间的耦合关系。将这个对象连成一条链，并沿着这条链传递该请求，直到有一个对像处理它为止。
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> 当用户提交一个请求时，请求是沿着链传递直至有一个对象负责处理它。
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> 接受者和发送者都没有对方的明确信息，且链中的对象自己也并不知道链的结构。结果是职责链可简化对象的相互连接，它们仅需要保持一个向其后继者的引用，而不需要保持它所有的候选者的引用。
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> 随时地增加或修改处理一个请求的结构。增强了给对象指派职责的灵活性。
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> 一个请求极有可能到了链的末端都得不到处理，或者因为没有正确配置而得不到处理。
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上一章：[第二十三章 烤羊肉串引来的思考 －－－ 命令模式](https://github.com/flyingalex/design-patterns-by-php/blob/master/chapter23.md)
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下一章：[第二十五章 ](https://github.com/flyingalex/design-patterns-by-php/blob/master/chapter25.md)

‎codes/ChainOfResponsibility.php

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// abstract class Handler
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// {
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// protected $successor;
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// 设置继承者
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// public function setSuccessor(Handler $successor)
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// {
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// $this->successor = $successor;
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// }
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// 处理请求的抽象方法
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// abstract function handleRequest(int $request);
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// }
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// 如果可以处理请求，就处理之，否者转发给它的后继者
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// class ConcreteHandler1 extends Handler
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// {
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// public function handleRequest(int $request)
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// {
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// echo "ConcreteHandler1 handle it\n";
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// } else if ($this->successor != null) {
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// // 转移
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// $this->successor->handleRequest($request);
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// }
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// }
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// // client
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// $h1 = new ConcreteHandler1();
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// $h2 = new ConcreteHandler2();
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// 设置职责链上下家
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// $h1->setSuccessor($h2);
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// $requests = [1,5,7,16,25];
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// 循环给最小处理者提交请求，不同的数额，由不同权限处理者处理
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// foreach ($requests as $value) {
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// $h1->handleRequest($value);
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// }
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{
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public function requestApplications(Request $request)
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{
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if ($request->requestType === 'dayoff' && $request->number <=2)
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if ($request->getRequestType() === 'dayoff' && $request->getNumber() <=2)
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{
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echo $this->name.":".$request->getRequestContent()." times:".$request->getNumber()."\n";
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} else {
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if ($this->superior != null) {
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$superior->requestApplications($request);
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$this->superior->requestApplications($request);
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}
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}
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}
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{
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public function requestApplications(Request $request)
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{
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if ($request->requestType === 'dayoff' && $request->number <=5)
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if ($request->getRequestType() === 'dayoff' && $request->getNumber() <=5)
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{
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echo $this->name.":".$request->getRequestContent()." times:".$request->getNumber()."\n";
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} else {
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if ($this->superior != null) {
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$superior->requestApplications($request);
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$this->superior->requestApplications($request);
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}
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}
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}
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{
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public function requestApplications(Request $request)
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{
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if ($request->requestType === 'dayoff')
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if ($request->getRequestType() === 'dayoff')
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{
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echo $this->name.":".$request->getRequestContent()." times:".$request->getNumber()."\n";
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} else if ($request->requestType === 'salary' && $request->number <= 500){
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} else if ($request->getRequestType() === 'salary' && $request->getNumber() <= 500){
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echo $this->name.":".$request->getRequestContent()." money:".$request->getNumber()."\n";
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} else {
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echo "no way!\n";
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}
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}
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}
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}
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$jinli = new CommonManager('jinli');
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$zongjian = new MajaorManager('zongjian');
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$zhongjinli = new GeneralManager('zhongjinli');
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$jinli->setSuperior($zongjian);
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$zongjian->setSuperior($zhongjinli);
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$request = new Request();
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$request->setRequestType('dayoff');
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$request->setRequestContent('xiaocai dayoff');
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$request->setNumber(1);
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$jinli->requestApplications($request);
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$request2 = new Request();
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$request2->setRequestType('dayoff');
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$request2->setRequestContent('xiaocai dayoff');
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$request2->setNumber(4);
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$jinli->requestApplications($request2);
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$request3 = new Request();
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$request3->setRequestType('salary');
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$request3->setRequestContent('xiaocai add salary');
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$request3->setNumber(500);
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$jinli->requestApplications($request3);
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$request4 = new Request();
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$request4->setRequestType('salary');
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$request4->setRequestContent('xiaocai add salary');
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$request4->setNumber(10000);
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$jinli->requestApplications($request4);
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