public function BackendCompilerPass::process in Drupal 8

Same name and namespace in other branches

1. 9 core/lib/Drupal/Core/DependencyInjection/Compiler/BackendCompilerPass.php \Drupal\Core\DependencyInjection\Compiler\BackendCompilerPass::process()
2. 10 core/lib/Drupal/Core/DependencyInjection/Compiler/BackendCompilerPass.php \Drupal\Core\DependencyInjection\Compiler\BackendCompilerPass::process()

File

core/lib/Drupal/Core/DependencyInjection/Compiler/BackendCompilerPass.php, line 39

Class

BackendCompilerPass

Defines a compiler pass to allow automatic override per backend.

Namespace

Drupal\Core\DependencyInjection\Compiler

Code

public function process(ContainerBuilder $container) {
  if ($container
    ->hasParameter('default_backend')) {
    $default_backend = $container
      ->getParameter('default_backend');

    // Opt out from the default backend.
    if (!$default_backend) {
      return;
    }
  }
  else {
    try {
      $default_backend = $container
        ->get('database')
        ->driver();
      $container
        ->set('database', NULL);
    } catch (\Exception $e) {

      // If Drupal is not installed or a test doesn't define database there
      // is nothing to override.
      return;
    }
  }
  foreach ($container
    ->findTaggedServiceIds('backend_overridable') as $id => $attributes) {

    // If the service is already an alias it is not the original backend, so
    // we don't want to fallback to other storages any longer.
    if ($container
      ->hasAlias($id)) {
      continue;
    }
    if ($container
      ->hasDefinition("{$default_backend}.{$id}") || $container
      ->hasAlias("{$default_backend}.{$id}")) {
      $container
        ->setAlias($id, new Alias("{$default_backend}.{$id}"));
    }
  }
}