function UpdateCompilerPass::process

File

core/lib/Drupal/Core/Update/UpdateCompilerPass.php, line 21

Class

UpdateCompilerPass

Removes services with unmet dependencies.

Namespace

Code

public function process(ContainerBuilder $container) {
  $process_aliases = FALSE;
  // Loop over the defined services and remove any with unmet dependencies.
  // The kernel cannot be booted if the container has such services. This
  // allows modules to run their update hooks to enable newly added
  // dependencies.
  do {
    $has_changed = FALSE;
    foreach ($container->getDefinitions() as $key => $definition) {
      // Ensure all the definition's arguments are valid.
      foreach ($definition->getArguments() as $argument) {
        if ($this->isArgumentMissingService($argument, $container)) {
          $container->removeDefinition($key);
          $container->log($this, sprintf('Removed service "%s"; reason: depends on non-existent service "%s".', $key, (string) $argument));
          $has_changed = TRUE;
          $process_aliases = TRUE;
          // Process the next definition.
          continue 2;
        }
      }
      // Ensure all the method call arguments are valid.
      foreach ($definition->getMethodCalls() as $call) {
        foreach ($call[1] as $argument) {
          if ($this->isArgumentMissingService($argument, $container)) {
            $container->removeDefinition($key);
            $container->log($this, sprintf('Removed service "%s"; reason: method call "%s" depends on non-existent service "%s".', $key, $call[0], (string) $argument));
            $has_changed = TRUE;
            $process_aliases = TRUE;
            // Process the next definition.
            continue 3;
          }
        }
      }
    }
    // Repeat if services have been removed.
  } while ($has_changed);
  // Remove aliases to services that have been removed. This does not need to
  // be part of the loop above because references to aliases have already been
  // resolved by Symfony's ResolveReferencesToAliasesPass.
  if ($process_aliases) {
    foreach ($container->getAliases() as $key => $alias) {
      $id = (string) $alias;
      if (!$container->has($id)) {
        $container->removeAlias($key);
        $container->log($this, sprintf('Removed alias "%s"; reason: alias to non-existent service "%s".', $key, $id));
      }
    }
  }
}