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Commitb8a7564

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minor#9973 [DoctrineBridge] update doctrine event listeners doc for Symfony 4.2 change (dmaicher, javiereguiluz)
This PR was merged into the master branch.Discussion----------[DoctrineBridge] update doctrine event listeners doc for Symfony 4.2 changeSeesymfony/symfony#27675.Doctrine entity listeners are always lazily instantiated as of Symfony 4.2.Commits-------4409fd6 Explain that lazy listeners are mandatory, not defaultb56ef9e Update event_listeners_subscribers.rstd8bb849 Reworded and added the versionadded directive601450e Update event_listeners_subscribers.rst
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‎doctrine/event_listeners_subscribers.rst‎

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@@ -186,57 +186,17 @@ interface and have an event method for each event it subscribes to::
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For a full reference, see chapter `The Event System`_ in the Doctrine documentation.
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Lazy loading for Event Listeners
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--------------------------------
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Performance Considerations
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--------------------------
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Onesubtle difference between listeners and subscribers is that Symfonycan load
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entity listeners lazily. This means thatyour listenerclass will only be fetched
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from the service container (andthus beinstantiated)once the eventitislinked
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to actually fires.
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Oneimportant difference between listeners and subscribers is that Symfonyloads
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entity listeners lazily. This means thatthe listenerclasses are only fetched
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from the service container (and instantiated)if therelatedevent isactually
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fired.
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Lazy loading might give you a slight performance improvement when your listener
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runs for events that rarely fire. Also, it can help you when you run into
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*circular dependency issues* that may occur when your listener service in turn
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depends on the DBAL connection.
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That's why it is preferable to use entity listeners instead of subscribers
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whenever possible.
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To mark a listener service as lazily loaded, just add the ``lazy`` attribute
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to the tag like so:
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..configuration-block::
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..code-block::yaml
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services:
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App\EventListener\SearchIndexer:
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tags:
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-{ name: doctrine.event_listener, event: postPersist, lazy: true }
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..code-block::xml
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<?xml version="1.0" ?>
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<containerxmlns="http://symfony.com/schema/dic/services"
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xmlns:doctrine="http://symfony.com/schema/dic/doctrine">
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<services>
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<serviceid="App\EventListener\SearchIndexer"autowire="true">
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<tagname="doctrine.event_listener"event="postPersist"lazy="true" />
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</service>
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</services>
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</container>
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..code-block::php
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use App\EventListener\SearchIndexer;
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$container
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->autowire(SearchIndexer::class)
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->addTag('doctrine.event_listener', array('event' => 'postPersist', 'lazy' => 'true'))
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;
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..note::
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  Marking an event listener as ``lazy`` has nothing to do with lazy service
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definitions which are described:doc:`in their own section</service_container/lazy_services>`
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.. _`The Event System`:http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/events.html
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.. _`the Doctrine Documentation`:http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/events.html#entity-listeners
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..versionadded::4.2
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Starting from Symfony 4.2, Doctrine entity listeners are always lazy. In
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previous Symfony versions this behavior was configurable.

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