Application of PHP design patterns in container and microservice architecture

The importance of design patterns in container and microservice architectures in solving design challenges: Singleton, factory, and dependency injection patterns simplify development and code quality in container architectures. Proxy, Observer, and Facade patterns enable functional decoupling, communication, and simplification of complex interfaces in microservices architecture.

Application of PHP design patterns in containers and microservice architecture

Introduction

Container and microservice architectures are wildly popular in modern software development, and design patterns play a vital role in these architectures. They provide reusable and proven solutions to common design challenges, simplifying development and improving code quality.

Application of design patterns in container architecture

• Singleton pattern: Ensure that there is only one specific class in the container instance. This is useful for sharing resources or implementing global state.
• Factory pattern: Provides a unified interface for creating objects. It allows dynamic creation of different types of objects, thus increasing flexibility.
• Dependency Injection (Dependency Injection) mode: Inject dependencies into classes instead of hardcoding them. This provides loose coupling and testability.

Practical case: Using singleton mode to manage database connections

// 数据库连接单例类
class Database
{
    private static $instance = null;

    private function __construct() {}

    public static function getInstance()
    {
        if (self::$instance === null) {
            self::$instance = new PDO('mysql:host=localhost;dbname=db', 'root', 'password');
        }

        return self::$instance;
    }
}

// 获取数据库连接实例
$db = Database::getInstance();

Application of design pattern in microservice architecture

• Proxy (Proxy) mode: Provides indirect access to remote services, thereby hiding their underlying implementation. This enables service decoupling and load balancing.
• Observer pattern: Allows objects to subscribe to events and respond to them. It is used to implement loosely coupled communication.
• Facade mode: Provides a simple unified interface for complex subsystems. It simplifies service calls and hides internal details.

Practical case: Using the observer pattern to notify microservices

// 事件接口
interface EventInterface
{
    public function getName();
}

// 事件类
class UserCreatedEvent implements EventInterface
{
    private $userId;

    public function __construct(int $userId)
    {
        $this->userId = $userId;
    }

    public function getName()
    {
        return 'user_created';
    }
}

// 观察者类
class NotifierObserver
{
    public function notify(EventInterface $event)
    {
        // 发送通知...
    }
}

// 事件发布者
class EventPublisher
{
    private $observers = [];

    public function subscribe(ObserverInterface $observer)
    {
        $this->observers[] = $observer;
    }

    public function publish(EventInterface $event)
    {
        foreach ($this->observers as $observer) {
            $observer->notify($event);
        }
    }
}

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