+ */
+final class ReverseContainer
+{
+ private $serviceContainer;
+ private $reversibleLocator;
+ private $tagName;
+ private $getServiceId;
+
+ public function __construct(Container $serviceContainer, ContainerInterface $reversibleLocator, string $tagName = 'container.reversible')
+ {
+ $this->serviceContainer = $serviceContainer;
+ $this->reversibleLocator = $reversibleLocator;
+ $this->tagName = $tagName;
+ $this->getServiceId = \Closure::bind(function ($service): ?string {
+ return array_search($service, $this->services, true) ?: array_search($service, $this->privates, true) ?: null;
+ }, $serviceContainer, Container::class);
+ }
+
+ /**
+ * Returns the id of the passed object when it exists as a service.
+ *
+ * To be reversible, services need to be either public or be tagged with "container.reversible".
+ *
+ * @param object $service
+ */
+ public function getId($service): ?string
+ {
+ if ($this->serviceContainer === $service) {
+ return 'service_container';
+ }
+
+ if (null === $id = ($this->getServiceId)($service)) {
+ return null;
+ }
+
+ if ($this->serviceContainer->has($id) || $this->reversibleLocator->has($id)) {
+ return $id;
+ }
+
+ return null;
+ }
+
+ /**
+ * @return object
+ *
+ * @throws ServiceNotFoundException When the service is not reversible
+ */
+ public function getService(string $id)
+ {
+ if ($this->serviceContainer->has($id)) {
+ return $this->serviceContainer->get($id);
+ }
+
+ if ($this->reversibleLocator->has($id)) {
+ return $this->reversibleLocator->get($id);
+ }
+
+ if (isset($this->serviceContainer->getRemovedIds()[$id])) {
+ throw new ServiceNotFoundException($id, null, null, [], sprintf('The "%s" service is private and cannot be accessed by reference. You should either make it public, or tag it as "%s".', $id, $this->tagName));
+ }
+
+ // will throw a ServiceNotFoundException
+ $this->serviceContainer->get($id);
+ }
+}
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/RegisterReverseContainerPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/RegisterReverseContainerPassTest.php
new file mode 100644
index 0000000000000..1610c13d2ad04
--- /dev/null
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/RegisterReverseContainerPassTest.php
@@ -0,0 +1,77 @@
+
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Tests\Compiler;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\Argument\ServiceLocatorArgument;
+use Symfony\Component\DependencyInjection\Compiler\PassConfig;
+use Symfony\Component\DependencyInjection\Compiler\RegisterReverseContainerPass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\ReverseContainer;
+
+class RegisterReverseContainerPassTest extends TestCase
+{
+ public function testCompileRemovesUnusedServices()
+ {
+ $container = new ContainerBuilder();
+ $container->register('foo', 'stdClass');
+ $container->register('reverse_container', ReverseContainer::class)
+ ->addArgument(new Reference('service_container'))
+ ->addArgument(new ServiceLocatorArgument([]))
+ ->setPublic(true);
+
+ $container->addCompilerPass(new RegisterReverseContainerPass(true));
+ $container->compile();
+
+ $this->assertFalse($container->has('foo'));
+ }
+
+ public function testPublicServices()
+ {
+ $container = new ContainerBuilder();
+ $container->register('foo', 'stdClass')->setPublic(true);
+ $container->register('reverse_container', ReverseContainer::class)
+ ->addArgument(new Reference('service_container'))
+ ->addArgument(new ServiceLocatorArgument([]))
+ ->setPublic(true);
+
+ $container->addCompilerPass(new RegisterReverseContainerPass(true));
+ $container->addCompilerPass(new RegisterReverseContainerPass(false), PassConfig::TYPE_AFTER_REMOVING);
+ $container->compile();
+
+ $foo = $container->get('foo');
+
+ $this->assertSame('foo', $container->get('reverse_container')->getId($foo));
+ $this->assertSame($foo, $container->get('reverse_container')->getService('foo'));
+ }
+
+ public function testReversibleServices()
+ {
+ $container = new ContainerBuilder();
+ $container->register('bar', 'stdClass')->setProperty('foo', new Reference('foo'))->setPublic(true);
+ $container->register('foo', 'stdClass')->addTag('container.reversible');
+ $container->register('reverse_container', ReverseContainer::class)
+ ->addArgument(new Reference('service_container'))
+ ->addArgument(new ServiceLocatorArgument([]))
+ ->setPublic(true);
+
+ $container->addCompilerPass(new RegisterReverseContainerPass(true));
+ $container->addCompilerPass(new RegisterReverseContainerPass(false), PassConfig::TYPE_AFTER_REMOVING);
+ $container->compile();
+
+ $foo = $container->get('bar')->foo;
+
+ $this->assertSame('foo', $container->get('reverse_container')->getId($foo));
+ $this->assertSame($foo, $container->get('reverse_container')->getService('foo'));
+ }
+}
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