function ConfigCacheTag::onSave

Invalidate cache tags when particular system config objects are saved.

Parameters

\Drupal\Core\Config\ConfigCrudEvent $event: The Event to process.

File

core/modules/system/src/EventSubscriber/ConfigCacheTag.php, line 49

Class

ConfigCacheTag

A subscriber invalidating cache tags when system config objects are saved.

Namespace

Code

public function onSave(ConfigCrudEvent $event) {
    $config_name = $event->getConfig()
        ->getName();
    // Changing the site settings may mean a different route is selected for the
    // front page. Additionally a change to the site name or similar must
    // invalidate the render cache since this could be used anywhere.
    if ($config_name === 'system.site') {
        $this->cacheTagsInvalidator
            ->invalidateTags([
            'route_match',
            'rendered',
        ]);
    }
    // Theme configuration and global theme settings.
    if (in_array($config_name, [
        'system.theme',
        'system.theme.global',
    ], TRUE)) {
        $this->cacheTagsInvalidator
            ->invalidateTags([
            'rendered',
        ]);
    }
    // Library and template overrides potentially change for the default theme
    // when the admin theme is changed.
    if ($config_name === 'system.theme' && $event->isChanged('admin')) {
        $this->cacheTagsInvalidator
            ->invalidateTags([
            'library_info',
            'theme_registry',
        ]);
    }
    // Theme-specific settings, check if this matches a theme settings
    // configuration object (THEME_NAME.settings), in that case, clear the
    // rendered cache tag.
    if (preg_match('/^([^\\.]*)\\.settings$/', $config_name, $matches)) {
        if ($this->themeHandler
            ->themeExists($matches[1])) {
            $this->cacheTagsInvalidator
                ->invalidateTags([
                'rendered',
            ]);
        }
    }
}