Symfony Services FooListener Example

services.yml

AppBundle\EventListener\FooListener:
    arguments:
        $entityManager: "@doctrine.orm.entity_manager"
    tags:
        - { name: 'doctrine.orm.entity_listener', event: 'preUpdate', entity: 'AppBundle\Entity\Foo' }
        - { name: 'doctrine.orm.entity_listener', event: 'postUpdate', entity: 'AppBundle\Entity\Foo' }