[DependencyInjection] Add #[AutowireCallable] and #[AutowireServiceClosure]

Author: alexandre-daubois

reference/attributes.rst

@@ -34,7 +34,9 @@ Dependency Injection
 * :ref:`Autoconfigure <lazy-services_configuration>`
 * :ref:`AutoconfigureTag <di-instanceof>`
 * :ref:`Autowire <autowire-attribute>`
+* :ref:`AutowireCallable <container_closure-as-argument>`
 * :doc:`AutowireDecorated </service_container/service_decoration>`
+* :doc:`AutowireServiceClosure </service_container/service_closures>`
 * :ref:`Exclude <service-psr4-loader>`
 * :ref:`TaggedIterator <tags_reference-tagged-services>`
 * :ref:`TaggedLocator <service-subscribers-locators_defining-service-locator>`

service_container.rst

@@ -702,6 +702,8 @@ For a full list of *all* possible services in the container, run:
 
     $ php bin/console debug:container
 
+.. _container_closure-as-argument:
+
 Injecting a Closure as an Argument
 ----------------------------------
 
@@ -796,6 +798,51 @@ Our configuration looks like this:
 
     The ``closure`` argument type was introduced in Symfony 6.1.
 
+It is also possible to convert a callable into an injected closure
+thanks to the
+:class:`Symfony\\Component\\DependencyInjection\\Attribute\\AutowireCallable`
+attribute. Let's say our ``MessageHashGenerator`` class now has a ``generate()``
+method::
+
+        // src/Hash/MessageHashGenerator.php
+        namespace App\Hash;
+
+        class MessageHashGenerator
+        {
+            public function generate(): string
+            {
+                // Compute and return a message hash
+            }
+        }
+
+We can inject the ``generate()`` method of the ``MessageHashGenerator``
+like this::
+
+    // src/Service/MessageGenerator.php
+    namespace App\Service;
+
+    use App\Hash\MessageHashGenerator;
+    use Psr\Log\LoggerInterface;
+    use Symfony\Component\DependencyInjection\Attribute\AutowireCallable;
+
+    class MessageGenerator
+    {
+        public function __construct(
+            private readonly LoggerInterface $logger,
+            #[AutowireCallable(service: MessageHashGenerator::class, method: 'generate')]
+            private readonly \Closure $generateMessageHash
+        ) {
+            // ...
+        }
+
+        // ...
+    }
+
+.. versionadded:: 6.3
+
+    The :class:`Symfony\\Component\\DependencyInjection\\Attribute\\AutowireCallable`
+    attribute was introduced in Symfony 6.3.
+
 .. _services-binding:
 
 Binding Arguments by Name or Type

service_container/service_closures.rst

@@ -92,6 +92,44 @@ argument of type ``service_closure``:
     Another way to inject services lazily is via a
     :doc:`service locator </service_container/service_subscribers_locators>`.
 
+Thanks to the
+:class:`Symfony\\Component\\DependencyInjection\\Attribute\\AutowireServiceClosure`
+attribute, defining a service wrapped in a closure can directly be done
+in the service class, without further configuration::
+
+    // src/Service/MyService.php
+    namespace App\Service;
+
+    use Symfony\Component\DependencyInjection\Attribute\AutowireServiceClosure;
+    use Symfony\Component\Mailer\MailerInterface;
+
+    class MyService
+    {
+        public function __construct(
+            #[AutowireServiceClosure('mailer')]
+            private readonly \Closure $mailer
+        ) {
+            $this->mailer = $mailer;
+        }
+
+        public function doSomething(): void
+        {
+            // ...
+
+            $this->getMailer()->send($email);
+        }
+
+        private function getMailer(): MailerInterface
+        {
+            return ($this->mailer)();
+        }
+    }
+
+.. versionadded:: 6.3
+
+    The :class:`Symfony\\Component\\DependencyInjection\\Attribute\\AutowireServiceClosure`
+    attribute was introduced in Symfony 6.3.
+
 Using a Service Closure in a Compiler Pass
 ------------------------------------------