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Jul 2, 2018
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Tell about ServiceLocatorTagPass::register() #9990

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Tell about ServiceLocatorTagPass::register()
nicolas-grekas Jul 1, 2018
b3a3905
Minor reword
javiereguiluz Jul 2, 2018
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21 changes: 18 additions & 3 deletions service_container/service_subscribers_locators.rst
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Expand Up @@ -349,9 +349,24 @@ Now you can use the service locator by injecting it in any other service:
->setArguments(array(new Reference('app.command_handler_locator')))
;

.. tip::
In :doc:`compiler passes </service_container/compiler_passes>` it's recommended
to use the :method:`Symfony\\Component\\DependencyInjection\\Compiler\\ServiceLocatorTagPass::register`
method to create the service locators. This will save you some boilerplate and
will share identical locators amongst all the services referencing them::

use Symfony\Component\DependencyInjection\Compiler\ServiceLocatorTagPass;
use Symfony\Component\DependencyInjection\ContainerBuilder;

public function process(ContainerBuilder $container)
{
//...

$locateableServices = array(
//...
'logger' => new Reference('logger'),
);

If the service locator is not intended to be used by multiple services, it's
better to create and inject it as an anonymous service.
$myService->addArgument(ServiceLocatorTagPass::register($locateableServices));
}

.. _`Command pattern`: https://en.wikipedia.org/wiki/Command_pattern