深入探讨PHP中的派发器设计模式

interface HandlerInterface {
    public function handle($request);
}

class CreateUserHandler implements HandlerInterface {
    public function handle($request) {
        // 处理创建用户的请求
    }
}

class UpdateUserHandler implements HandlerInterface {
    public function handle($request) {
        // 处理更新用户的请求
    }
}

class DeleteUserHandler implements HandlerInterface {
    public function handle($request) {
        // 处理删除用户的请求
    }
}

class Dispatcher {
    protected $handlers = [];

    public function register($requestType, HandlerInterface $handler) {
        $this->handlers[$requestType] = $handler;
    }

    public function dispatch($request) {
        $requestType = $request->getType();
        if (isset($this->handlers[$requestType])) {
            $handler = $this->handlers[$requestType];
            $handler->handle($request);
        } else {
            throw new Exception("No handler found for request type: " . $requestType);
        }
    }
}

class UserRequest {
    protected $type;

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

    public function getType() {
        return $this->type;
    }
}

$dispatcher = new Dispatcher();

// 注册处理器
$dispatcher->register('create', new CreateUserHandler());
$dispatcher->register('update', new UpdateUserHandler());
$dispatcher->register('delete', new DeleteUserHandler());

// 创建请求
$request = new UserRequest('create');
$dispatcher->dispatch($request);