function ConfigSubscriber::onConfigSave

Causes the container to be rebuilt on the next request.

This event subscriber assumes that the new default langcode and old default langcode are valid langcodes. If the schema definition of either system.site:default_langcode or language.negotiation::url.prefixes changes then this event must be changed to work with both the old and new schema definition so this event is update safe.

Parameters

\Drupal\Core\Config\ConfigCrudEvent $event: The configuration event.

File

core/modules/language/src/EventSubscriber/ConfigSubscriber.php, line 87

Class

ConfigSubscriber

Deletes the container if default language has changed.

Namespace

Code

public function onConfigSave(ConfigCrudEvent $event) {
    $saved_config = $event->getConfig();
    if ($saved_config->getName() == 'system.site' && $event->isChanged('default_langcode')) {
        $new_default_langcode = $saved_config->get('default_langcode');
        $default_language = $this->configFactory
            ->get('language.entity.' . $new_default_langcode);
        // During an import the language might not exist yet.
        if (!$default_language->isNew()) {
            $this->languageDefault
                ->set(new Language($default_language->get()));
            $this->languageManager
                ->reset();
            // Directly update language negotiation settings instead of calling
            // language_negotiation_url_prefixes_update() to ensure that the code
            // obeys the hook_update_N() restrictions.
            $negotiation_config = $this->configFactory
                ->getEditable('language.negotiation');
            $negotiation_changed = FALSE;
            $url_prefixes = $negotiation_config->get('url.prefixes');
            $old_default_langcode = $saved_config->getOriginal('default_langcode');
            if (empty($url_prefixes[$old_default_langcode])) {
                $negotiation_config->set('url.prefixes.' . $old_default_langcode, $old_default_langcode);
                $negotiation_changed = TRUE;
            }
            if (empty($url_prefixes[$new_default_langcode])) {
                $negotiation_config->set('url.prefixes.' . $new_default_langcode, '');
                $negotiation_changed = TRUE;
            }
            if ($negotiation_changed) {
                $negotiation_config->save(TRUE);
            }
        }
        // Trigger a container rebuild on the next request by invalidating it.
        ConfigurableLanguageManager::rebuildServices();
    }
    elseif ($saved_config->getName() == 'language.types' && $event->isChanged('negotiation')) {
        // If the negotiation configuration changed the language negotiator and
        // the language path processor have to be reset so that they regenerate
        // the method instances and also sort them accordingly to the new config.
        $this->languageNegotiator
            ->reset();
        if (isset($this->pathProcessorLanguage)) {
            $this->pathProcessorLanguage
                ->reset();
        }
    }
}