php - 干 : how to use this code in several entities accross Symfony2 project? 特征？

Question

我有一段重复的代码，将在我的 Symfony2 项目中的多个实体中使用，因此应用某种 DRY 就可以了，当然如果可能的话，我正在考虑 PHP Traits .

private static $preDeletedEntities;// static array that will contain entities due to deletion.
private static $deletedEntities;// static array that will contain entities that were deleted (well, at least the SQL was thrown).

/**
 * This callback will be called on the preRemove event
 * @ORM\PreRemove
 */
public function entityDueToDeletion()
{
    // This entity is due to be deleted though not deleted yet.
    self::$preDeletedEntities[] = $this->getId();
}

/**
 * This callback will be called in the postRemove event
 * @ORM\PostRemove
 */
public function entityDeleted()
{
    // The SQL to delete the entity has been issued. Could fail and trigger the rollback in which case the id doesn't get stored in the array.
    self::$deletedEntities[] = $this->getId();
}

public static function getDeletedEntities()
{
    return array_slice(self::$preDeletedEntities, 0, count(self::$deletedEntities));
}

public static function getNotDeletedEntities()
{
    return array_slice(self::$preDeletedEntities, count(self::$deletedEntities)+1, count(self::$preDeletedEntities));
}

public static function getFailedToDeleteEntity()
{
    if(count(self::$preDeletedEntities) == count(self::$deletedEntities)) {
        return NULL; // Everything went ok
    }

    return self::$preDeletedEntities[count(self::$deletedEntities)]; // We return the id of the entity that failed.
}

public static function prepareArrays()
{
    self::$preDeletedEntities = array();
    self::$deletedEntities = array();
}

这是我想到的代码:

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\HasLifecycleCallbacks()
 */
trait DeleteLifeCycleCallbacksTrait
{
    // write things here
}

但是注释会应用于实体吗？可以吗？你会怎样做才能避免不重复代码？

编辑:尝试找到最佳方法

从 @Cerad 用户那里得到一些想法，并且正如文档所说，生命周期事件监听器比简单的生命周期回调功能强大得多，然后我将开始使用它们。

因此，首先，这个生命周期回调|监听器|订阅者的目的是存储每个持久对象的 ID，以便我可以以某种方式获取它并从 Controller 发送回 View 。作为一个简单的视觉示例，假设我从 View 向 Controller 发送这个值数组 (1, 2, 3, 4, 5) ，由于某些 X 原因，只有 1 ,4 和 5持久化(意味着从数据库中完全删除)到数据库，对吗？

我们还要说，我将在 Producto 实体中使用事件监听器。因此，如果不进行测试而仅从示例中获取代码，则 Listener 的代码应该如下所示:

use Doctrine\ORM\Event\LifecycleEventArgs;
use Entity\Producto;

class StoreDeletedIds
{
    private $deletedItems = []; 

    public function postDelete(LifecycleEventArgs $args)
    {
        $entity = $args->getEntity();
        $entityManager = $args->getEntityManager();

        if ($entity instanceof Producto) {
            array_push($deletedItems, $entity->getId());
        }
    }
}

我对此的疑问是:

• 上面的代码可以吗？
• 每次 Doctrine 调用监听器时，$deletedItems 都会被清理吗？
• 如何返回 $deletedItems 以便在 Controller 上捕获它并将其发送回 View ？
• 我还需要定义订阅者吗？为什么？

这对我来说是新主题，所以我需要一些建议

Answer 1

在@PeterPopelyshko评论之后，这是我提供的解决方案，只需定义一个抽象类Model\DeleteLifeCycleCallbacks.php并将代码放入其中:

use Doctrine\ORM\Mapping as ORM; // not so sure if this is need here

abstract class DeleteLifeCycleCallbacks
{
    private static $preDeletedEntities;// static array that will contain entities due to deletion.
    private static $deletedEntities;// static array that will contain entities that were deleted (well, at least the SQL was thrown).

    /**
     * This callback will be called on the preRemove event
     * @ORM\PreRemove
     */
    public function entityDueToDeletion()
    {
        // This entity is due to be deleted though not deleted yet.
        self::$preDeletedEntities[] = $this->getId();
    }

    /**
     * This callback will be called in the postRemove event
     * @ORM\PostRemove
     */
    public function entityDeleted()
    {
        // The SQL to delete the entity has been issued. Could fail and trigger the rollback in which case the id doesn't get stored in the array.
        self::$deletedEntities[] = $this->getId();
    }

    public static function getDeletedEntities()
    {
        return array_slice(self::$preDeletedEntities, 0, count(self::$deletedEntities));
    }

    public static function getNotDeletedEntities()
    {
        return array_slice(self::$preDeletedEntities, count(self::$deletedEntities)+1, count(self::$preDeletedEntities));
    }

    public static function getFailedToDeleteEntity()
    {
        if(count(self::$preDeletedEntities) == count(self::$deletedEntities)) {
            return NULL; // Everything went ok
        }

        return self::$preDeletedEntities[count(self::$deletedEntities)]; // We return the id of the entity that failed.
    }

    public static function prepareArrays()
    {
        self::$preDeletedEntities = array();
        self::$deletedEntities = array();
    }
}

然后按如下方式使用:

/**
 * @ORM\Entity
 * @ORM\HasLifecycleCallbacks()
 */
class Producto extends Model\DeleteLifeCycleCallbacks
{
    // entity methods and properties here
}