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[AutowireLocator] Using #[AutowireLocator] with tagged class #20934

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71 changes: 71 additions & 0 deletions service_container/service_subscribers_locators.rst
Original file line number Diff line number Diff line change
Expand Up @@ -397,6 +397,77 @@ attribute::
}
}

Using AutowireLocator with tagged class

Another way to use
:class:`Symfony\\Component\\DependencyInjection\\Attribute\\AutowireLocator`
attribute is location class tagged with a specific :doc:`tag </service_container/tags>`

Tagging allows you to add classes without having to explicitly list classes in
:class:`Symfony\\Component\\DependencyInjection\\Attribute\\AutowireLocator`
attribute

It is also possible to use the #[AutoconfigureTag] attribute directly on the base class or interface and all classes implementing this interface will be automatically tagged and included in
:class:`Symfony\\Component\\DependencyInjection\\Attribute\\AutowireLocator`
attribute::

// src/CommandBus.php
namespace App;

use Psr\Container\ContainerInterface;
use Symfony\Component\DependencyInjection\Attribute\AutowireLocator;

class CommandBus
{
public function __construct(
#[AutowireLocator("command_handler")]
private ContainerInterface $handlers,
) {
}

public function handle(Object $command, string $handlerClassName): mixed
{
if ($this->handlers->has($handlerClassName)) {
$handler = $this->handlers->get($handlerClassName);

return $handler->handle($command);
}
}
}

// src/CommandHandler/CommandHandlerInterface.php
namespace App\CommandHandler;

use Symfony\Component\DependencyInjection\Attribute\AutoconfigureTag;

#[AutoconfigureTag('command_handler')]
interface CommandHandlerInterface
{
public function handle(object $command);
}

// src/CommandHandler/FooHandler.php
namespace App\CommandHandler;

class FooHandler implements CommandHandlerInterface
{
public function handle(object $command)
{
dump("Foo", $command);
}
}

// src/CommandHandler/BarHandler.php
namespace App\CommandHandler;

class BarHandler implements CommandHandlerInterface
{
public function handle(object $command)
{
dump("Bar", $command);
}
}

.. _service-locator_autowire-iterator:

The AutowireIterator Attribute
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