php - 延迟加载和依赖注入模式中的冗余 getter 和 setter

Question

我目前正在我的 PHP 应用程序中实现延迟初始化和依赖注入模式，并面临以下问题：

每个类都有一堆提供外部类对象的 getter 和 setter 方法。有没有一种优雅的方法可以将这种“冗余”删除到父类或某种工厂？

编辑：不失去可测试性的优势;-)

EDIT2：这是一个 getter 和 setter 方法的示例，就像我使用它们一样：

function getSql() {
    if (is_object($this->sql) === FALSE) {
        $registry = \Registry::getInstance();
        $factories = $registry->get('factories');
        $database = $factories['databaseSql'];
        $this->sql = $database->getSql();
    }

    return $this->sql;
}

function setSql($sqlObject) {
    // ... some checks
    $this->sql = $sqlObject;
}

EDIT3 我遵循了使用特征的想法，所以这里是一个使用“注册”类特征的示例解决方案：

trait Registration {

    private $registration = null;

    public function getRegistration() {
        $registry = \Registry::getInstance();
        $factories = $registry->get('factories');

        if (is_object($this->registration) === TRUE) {
            // get obect if instance already exists
            $registration = $this->registration;
        } else if (isset($factories['registration']) === TRUE) {
            // get object using the matching factory
            $registrationFactory = $factories['registration'];
            $registration = $registrationFactory->getRegistration();
        } else if (class_exists('\engine\classes\Registration') === TRUE) {
            // get object using the default object class when no specific factory is defined
            $registration = new \engine\classes\Registration();
        } else {
            throw new \Exception('error getting an instance of Registration');
        }

        $this->registration = $registration;

        return $registration;
    }

    public function setRegistration($object) {
        if (is_object($object) === FALSE)
            throw new \Exception('invalid registration object');

        $this->registration = $object;
    }
}

用法

class Foo {
    use Registration;

    public function bar() {
        $reg = $this->getRegistration();
        // ... use instance of Registration
    }
}