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This article brings you relevant knowledge about PHP design patterns. It mainly introduces how PHP implements the chain of responsibility design pattern. Let's take a look at it together. I hope it will be helpful to friends in need.
Reference article address: Let’s talk in depth about the "responsibility chain pattern" of the design pattern tool (with go implementation Process)
Just read the reference article for the implementation principle. The original text is implemented in Go language. Here is a PHP version of the implementation, and the framework uses hyperf.
File structure:
IndexController is the calling end, UserInfoEntity user entity is used to store user information, and flow contains various processing processes
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); } }
Write a unit test and run the index method of indexController. The results are as follows:
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