CreateRegistryServicesPass.php

<?php

final class CreateRegistryServicesPass extends AbstractCompilerPass
{
  # …
  
  /**
   * Create a service decorator which will memoize values returned by the registry making it deterministic.
   *
   * @param ContainerBuilder $container
   * @param string $registryId
   * @param string $memoizeGroup
   *
   * @return void
   */
  private function processMemoizer(ContainerBuilder $container, $registryId, $memoizeGroup)
  {
    $decorator = new DefinitionDecorator("{$this->getAlias()}.registry.memoizer");

    $decorator->setDecoratedService(
      $registryId,
      /* $renamedId = */ "{$registryId}_inner"
    );

    $decorator->setPublic(false);

    $decorator->addArgument(new Reference("{$registryId}_inner"));
    $decorator->addArgument($memoizeGroup);

    $container->setDefinition(
      /* $id = */  "{$registryId}_memoizer",
      $decorator
    );
  }

  # …
}

services.yml

services:
  registry.memoizer:
    class: RegistryMemoizer
    abstract: true
    arguments:
      - @registry.memoizer_backend

  registry.doctrine_dbal_memoizer_backend:
    class: DoctrineDbalMemoizeBackend

  registry.memoizer_backend:
    alias: registry.doctrine_dbal_memoizer_backend