对具有不同服务参数的多个实体使用相同的EntityListener [英] Using the same EntityListener for multiple entities with differrent service argument

问题描述

由于EntityListener被注册为服务，是否可以使用不同的参数多次注册相同的类，并将每个类与特定的实体相关联?

As an EntityListener is registered as a service, is it possible to register the same class multiple times with different argument and associate each of them with a particular entity ?

考虑以下实体:

/**
 * Class EntityA
 * @ORM\Entity
 * @ORM\EntityListeners({"myBundle\EventListener\SharedListener"})
 */
class EntityA implements sharedBehaviourInterface
{
    // stuff here
}

/**
 * Class EntityB
 * @ORM\Entity
 * @ORM\EntityListeners({"myBundle\EventListener\SharedListener"})
 */
class EntityB implements sharedBehaviourInterface
{
    // stuff here
}

我想为这两个先前的实体注册以下侦听器:

I would like to register the following listener for both previous entities as this :

class SharedListener
{
    private $usefulParameter;

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

    /**
     * @PrePersist
     *
     */
    public function prePersist(sharedBehaviourInterface $dbFile, LifecycleEventArgs $event)
    {
        // code here
    }

    // more methods
}

使用:

mybundle.entitya.listener:
    class: myBundle\EventListener\SharedListener
    arguments:
        - '%entitya.parameter%' # The important change goes here ...
    tags:
        - { name: doctrine.orm.entity_listener }
mybundle.entityb.listener:
    class: myBundle\EventListener\SharedListener
    arguments:
        - '%entityb.parameter%' # ... and here
    tags:
        - { name: doctrine.orm.entity_listener }

它不起作用，实际上让我感到惊讶的是，实体中的EntityListener声明针对的是Listener类而不是服务.是否可以针对特定服务?喜欢:

It does not work, and I'm actually surprised that the EntityListener declaration in the Entity targets the Listener class and not the service. Is it possible to target a specific service instead ? Like :

@ORM\EntityListeners({"mybundle.entityb.listener"})

或者我想做的事甚至不可能吗?

Or what I'm trying to do isn't even possible ?

推荐答案

您可以使用 @configured_service_id 表示法将其他服务注入到服务中.此方法适用于构造函数参数和setter注入.

You can inject other services into services with the @configured_service_id notation.This works for constructor arguments and setter injection.

通常所说:不要尝试在不需要的地方找到抽象.在大多数情况下，从长远来看，稍微重复一些代码就容易得多.

Generally spoken: Do not try to find an abstraction where it isn't needed. Most of the time a little code duplication is far easier in long term.

我将为每个目的简单地构建两个独立的侦听器.

I would simply built two independent listeners for each purpose.

做一个简单的检查，如果Entity不是应由同一侦听器处理的两个实体之一，则跳出处理程序:

Do a simple check that jumps out of the handler if the Entity is NOT one of the two Entities that should be handled with the same listener:

<?php
use Doctrine\Common\Persistence\Event\LifecycleEventArgs;

class MyEventListener
{
    public function preUpdate(LifecycleEventArgs $args)
    {
        $entity = $args->getObject();
        $entityManager = $args->getObjectManager();

        if (!$entity instanceof EntityA && !$entity instanceof EntityB) {
            return;
        }

        /* Your listener code */
    }
}

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