依赖注入模式
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<?php
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namespace demo\Structural\DependencyInjection;
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/**
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* 数据库配置
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*/
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class DatabaseConfiguration
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{
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/**
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* @var string
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*/
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private $host;
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/**
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* @var int
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*/
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private $port;
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/**
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* @var string
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*/
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private $username;
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/**
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* @var string
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*/
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private $password;
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public function __construct(string $host, int $port, string $username, string $password)
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{
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$this->host = $host;
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$this->port = $port;
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$this->username = $username;
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$this->password = $password;
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}
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public function getHost() : string
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{
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return $this->host;
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}
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public function getPort() : int
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{
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return $this->port;
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}
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public function getUsername() : string
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{
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return $this->username;
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}
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public function getPassword() : string
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{
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return $this->password;
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}
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}
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<?php
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namespace demo\Structural\DependencyInjection;
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/**
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* 数据库连接
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*/
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class DatabaseConnection
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{
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/**
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* @var DatabaseConfiguration
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*/
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private $configuration;
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/**
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* @param DatabaseConfiguration $config
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*/
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public function __construct(DatabaseConfiguration $config)
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{
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$this->configuration = $config;
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}
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public function getDsn() : string
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{
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// 这仅仅是演示,而不是一个真正的 DSN
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// 注意,这里只使用了注入的配置。 所以,
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// 这里是关键的分离关注点。
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// 将获取的信息 按照 %s:%s@%s:%d 拼装成字符串
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// 格式化字符串
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return sprintf(
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'%s:%s@%s:%d',
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$this->configuration->getUsername(),
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$this->configuration->getPassword(),
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$this->configuration->getHost(),
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$this->configuration->getPort()
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);
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}
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}
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<?php
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namespace demo\Structural\DependencyInjection;
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class Run extends \bin\Design
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{
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/**
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* 用松散耦合的方式来更好的实现可测试、可维护和可扩展的代码。
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*
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* 依赖注入模式:依赖注入(Dependency Injection)是控制反转(Inversion of Control)的一种实现方式。
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* 要实现控制反转,通常的解决方案是将创建被调用者实例的工作交由 IoC 容器来完成,然后在调用者中注入被调用者(通过构造器 / 方法注入实现),
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* 这样我们就实现了调用者与被调用者的解耦,该过程被称为依赖注入。
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*
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* DatabaseConfiguration 被注入 DatabaseConnection 并获取所需的 $config 。
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* 如果没有依赖注入模式, 配置将直接创建 DatabaseConnection 。这对测试和扩展来说很不好。
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*
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* @inheritDoc
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*/
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public function setDesignName() : string
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{
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return '依赖注入模式(Dependency Injection)';
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}
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/**
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* @inheritDoc
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*/
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public function setDesignRefUrl() : string
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{
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return 'https://learnku.com/docs/php-design-patterns/2018/DependencyInjection/1501';
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}
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/**
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* @inheritDoc
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*/
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public function main()
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{
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// 设置配置信息
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$config = new DatabaseConfiguration('localhost', 3306, 'domnikl', '1234');
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// 格式化配置信息
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$connection = new DatabaseConnection($config);
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dump($connection->getDsn());
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}
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}
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<?php
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namespace demo\Structural\DependencyInjection\Tests;
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use demo\Structural\DependencyInjection\DatabaseConfiguration;
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use demo\Structural\DependencyInjection\DatabaseConnection;
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class DependencyInjectionTest extends \PHPUnit\Framework\TestCase
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{
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public function testDependencyInjection()
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{
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$config = new DatabaseConfiguration('localhost', 3306, 'domnikl', '1234');
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$connection = new DatabaseConnection($config);
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$this->assertEquals('domnikl:1234@localhost:3306', $connection->getDsn());
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}
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}
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