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[DependencyInjection] add tagged argument locator #15821

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[DependencyInjection] add tagged argument locator #15821

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46 changes: 46 additions & 0 deletions service_container/service_subscribers_locators.rst
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Expand Up @@ -395,6 +395,52 @@ other services. To do so, create a new service definition using the
The services defined in the service locator argument must include keys,
which later become their unique identifiers inside the locator.

.. versionadded:: 5.4

Since Symfony 5.4 you can create a reusable service locator from tagged services too:

.. configuration-block::

.. code-block:: yaml

# config/services.yaml
services:
app.command_handler_locator:
class: Symfony\Component\DependencyInjection\ServiceLocator
arguments: [!tagged_iterator { tag: 'app.handler', default_index_method: 'getCommandName' }]

.. code-block:: xml

<!-- config/services.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://symfony.com/schema/dic/services https://symfony.com/schema/dic/services/services-1.0.xsd">

<services>

<service id="app.command_handler_locator" class="Symfony\Component\DependencyInjection\ServiceLocator">
<argument type="tagged_iterator" tag="app.handler" default-index-method="getCommandName"/>
</service>

</services>
</container>

.. code-block:: php

// config/services.php
namespace Symfony\Component\DependencyInjection\Loader\Configurator;

use Symfony\Component\DependencyInjection\ServiceLocator;

return function(ContainerConfigurator $configurator) {
$services = $configurator->services();

$services->set('app.command_handler_locator', ServiceLocator::class)
->args([tagged_iterator('app.handler', null, 'getCommandName')])
;
};

Now you can inject the service locator in any other services:

.. configuration-block::
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