关于 php:Symfony DI：Doctrine 事件订阅者的循环服务参考

Symfony DI : Circular service reference with Doctrine event subscriber

为了重构有关工单通知系统的代码，我创建了一个 Doctrine 监听器：

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final class TicketNotificationListener implements EventSubscriber
{
/**
* @var TicketMailer
*/
private $mailer;

/**
* @var TicketSlackSender
*/
private $slackSender;

/**
* @var NotificationManager
*/
private $notificationManager;

/**
* We must wait the flush to send closing notification in order to
* be sure to have the latest message of the ticket.
*
* @var Ticket[]|ArrayCollection
*/
private $closedTickets;

/**
* @param TicketMailer $mailer
* @param TicketSlackSender $slackSender
* @param NotificationManager $notificationManager
*/
public function __construct(TicketMailer $mailer, TicketSlackSender $slackSender, NotificationManager $notificationManager)
{
$this->mailer = $mailer;
$this->slackSender = $slackSender;
$this->notificationManager = $notificationManager;

$this->closedTickets = new ArrayCollection();
}

// Stuff…
}

目标是在使用 Doctrine SQL 创建或更新 Ticket 或 TicketMessage 实体时通过邮件、Slack 和内部通知发送通知。

我已经遇到了 Doctrine 的循环依赖问题，所以我从事件 args 中注入了实体管理器：

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class NotificationManager
{
/**
* Must be set instead of extending the EntityManagerDecorator class to avoid circular dependency.
*
* @var EntityManagerInterface
*/
private $entityManager;

/**
* @var NotificationRepository
*/
private $notificationRepository;

/**
* @var RouterInterface
*/
private $router;

/**
* @param RouterInterface $router
*/
public function __construct(RouterInterface $router)
{
$this->router = $router;
}

/**
* @param EntityManagerInterface $entityManager
*/
public function setEntityManager(EntityManagerInterface $entityManager)
{
$this->entityManager = $entityManager;
$this->notificationRepository = $this->entityManager->getRepository(‘AppBundle:Notification’);
}

// Stuff…
}

管理器从 TicketNotificationListener

注入

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public function postPersist(LifecycleEventArgs $args)
{
// Must be lazy set from here to avoid circular dependency.
$this->notificationManager->setEntityManager($args->getEntityManager());
$entity = $args->getEntity();
}

Web 应用程序正在运行，但是当我尝试运行像 doctrine:database:drop 这样的命令时，我得到了这个：

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[Symfony\\Component\\DependencyInjection\\Exception\\ServiceCircularReferenceException]
Circular reference detected for service“doctrine.dbal.default_connection”, path:“doctrine.dbal.default_connection -> mailer.ticket -> twig -> security.authorization_checker -> security.authentication.manager -> fos_user.user_provider.username_email -> fos_user.user_manager”.

但这与 vendor服务有关。

如何解决这个问题？为什么我只在 cli 上出现此错误？

谢谢。

Symfony DI : Circular service reference with Doctrine event subscriber

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