本篇文章给大家带来了关于php设计模式的相关知识，其中主要介绍了php是怎么实现职责链设计模式的，下面一起来看一下，希望对需要的朋友有所帮助。
PHP实现职责链设计模式
参考文章地址：深入聊聊设计模式利器之“职责链模式”（附go实现流程）
实现原理看参考文章就好了 原文是用 go 语言去实现，这里写一个 php 版本的实现方式，框架用的 hyperf。
文件结构：
IndexController 为调用端，UserInfoEntity 用户实体用于存用户信息，flow 里面的为各种处理流程
IndexController
<?php declare(strict_types=1);
/**
* This file is part of Hyperf.
*
* @link https://www.hyperf.io
* @document https://hyperf.wiki
* @contact group@hyperf.io
* @license https://github.com/hyperf/hyperf/blob/master/LICENSE
*/
namespace App\Controller;
use App\Service\Entity\UserInfoEntity;
use App\Service\Flow\Cashier;
use App\Service\Flow\Clinic;
use App\Service\Flow\Pharmacy;
use App\Service\Flow\Reception;
use App\Service\StartHandler;
class IndexController extends AbstractController
{
public function index()
{
$startHandler = new StartHandler();
$userInfo = (new UserInfoEntity())->setName('zhangsan');
$startHandler->setNextHandler(new Reception())
->setNextHandler(new Clinic())
->setNextHandler(new Cashier())
->setNextHandler(new Pharmacy());
$startHandler->execute($userInfo);
}
}
UserInfoEntity
<?php declare(strict_types=1);
/**
* This file is part of Hyperf.
*
* @link https://www.hyperf.io
* @document https://hyperf.wiki
* @contact group@hyperf.io
* @license https://github.com/hyperf/hyperf/blob/master/LICENSE
*/
namespace App\Service\Entity;
class UserInfoEntity
{
private string $name;
private bool $registrationDone = false;
private bool $doctorCheckUpDone = false;
private bool $medicineDone = false;
private bool $paymentDone = false;
public function getName(): string
{
return $this->name;
}
public function setName(string $name): UserInfoEntity
{
$this->name = $name;
return $this;
}
public function isRegistrationDone(): bool
{
return $this->registrationDone;
}
public function setRegistrationDone(bool $registrationDone): UserInfoEntity
{
$this->registrationDone = $registrationDone;
return $this;
}
public function isDoctorCheckUpDone(): bool
{
return $this->doctorCheckUpDone;
}
public function setDoctorCheckUpDone(bool $doctorCheckUpDone): UserInfoEntity
{
$this->doctorCheckUpDone = $doctorCheckUpDone;
return $this;
}
public function isMedicineDone(): bool
{
return $this->medicineDone;
}
public function setMedicineDone(bool $medicineDone): UserInfoEntity
{
$this->medicineDone = $medicineDone;
return $this;
}
public function isPaymentDone(): bool
{
return $this->paymentDone;
}
public function setPaymentDone(bool $paymentDone): UserInfoEntity
{
$this->paymentDone = $paymentDone;
return $this;
}
}
HandlerInterface
<?php declare(strict_types=1);
/**
* This file is part of Hyperf.
*
* @link https://www.hyperf.io
* @document https://hyperf.wiki
* @contact group@hyperf.io
* @license https://github.com/hyperf/hyperf/blob/master/LICENSE
*/
namespace App\Service;
use App\Service\Entity\UserInfoEntity;
interface HandlerInterface
{
public function setNextHandler(HandlerInterface $handler): HandlerInterface;
public function execute(UserInfoEntity $info);
public function do(UserInfoEntity $info);
}
AbstractHandler
<?php declare(strict_types=1);
/**
* This file is part of Hyperf.
*
* @link https://www.hyperf.io
* @document https://hyperf.wiki
* @contact group@hyperf.io
* @license https://github.com/hyperf/hyperf/blob/master/LICENSE
*/
namespace App\Service;
use App\Service\Entity\UserInfoEntity;
class AbstractHandler implements HandlerInterface
{
private HandlerInterface $nextHandler;
public function setNextHandler(HandlerInterface $handler): HandlerInterface
{
$this->nextHandler = $handler;
return $this->nextHandler;
}
public function execute(UserInfoEntity $info)
{
if (! empty($this->nextHandler)) {
try {
$this->nextHandler->do($info);
} catch (\Exception $e) {
return;
}
return $this->nextHandler->execute($info);
}
}
public function do(UserInfoEntity $info)
{
// TODO: Implement do() method.
}
}
StartHandler
<?php declare(strict_types=1);
/**
* This file is part of Hyperf.
*
* @link https://www.hyperf.io
* @document https://hyperf.wiki
* @contact group@hyperf.io
* @license https://github.com/hyperf/hyperf/blob/master/LICENSE
*/
namespace App\Service;
class StartHandler extends AbstractHandler
{
}
Cashier
<?php declare(strict_types=1);
/**
* This file is part of Hyperf.
*
* @link https://www.hyperf.io
* @document https://hyperf.wiki
* @contact group@hyperf.io
* @license https://github.com/hyperf/hyperf/blob/master/LICENSE
*/
namespace App\Service\Flow;
use App\Service\AbstractHandler;
use App\Service\Entity\UserInfoEntity;
class Cashier extends AbstractHandler
{
public function do(UserInfoEntity $info)
{
echo '收费' . PHP_EOL;
$info->setPaymentDone(true);
}
}
Clinic
<?php declare(strict_types=1);
/**
* This file is part of Hyperf.
*
* @link https://www.hyperf.io
* @document https://hyperf.wiki
* @contact group@hyperf.io
* @license https://github.com/hyperf/hyperf/blob/master/LICENSE
*/
namespace App\Service\Flow;
use App\Service\AbstractHandler;
use App\Service\Entity\UserInfoEntity;
class Clinic extends AbstractHandler
{
public function do(UserInfoEntity $info)
{
echo '诊室' . PHP_EOL;
$info->setDoctorCheckUpDone(true);
}
}
Pharmacy
<?php declare(strict_types=1);
/**
* This file is part of Hyperf.
*
* @link https://www.hyperf.io
* @document https://hyperf.wiki
* @contact group@hyperf.io
* @license https://github.com/hyperf/hyperf/blob/master/LICENSE
*/
namespace App\Service\Flow;
use App\Service\AbstractHandler;
use App\Service\Entity\UserInfoEntity;
class Pharmacy extends AbstractHandler
{
public function do(UserInfoEntity $info)
{
echo '药房' . PHP_EOL;
$info->setMedicineDone(true);
}
}
Reception
<?php declare(strict_types=1);
/**
* This file is part of Hyperf.
*
* @link https://www.hyperf.io
* @document https://hyperf.wiki
* @contact group@hyperf.io
* @license https://github.com/hyperf/hyperf/blob/master/LICENSE
*/
namespace App\Service\Flow;
// 挂号
use App\Service\AbstractHandler;
use App\Service\Entity\UserInfoEntity;
class Reception extends AbstractHandler
{
public function do(UserInfoEntity $info)
{
echo '挂号' . PHP_EOL;
$info->setRegistrationDone(true);
}
}
写一个单元测试跑一下 indexController 的 index 方法，结果如下：
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