Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Core\EventSubscriber;
Chris@0: 
Chris@0: use Drupal\Core\Config\ConfigEvents;
Chris@0: use Drupal\Core\Config\ConfigManagerInterface;
Chris@0: use Drupal\Core\Config\StorageInterface;
Chris@0: use Drupal\Core\Config\ConfigImporterEvent;
Chris@0: use Symfony\Component\EventDispatcher\EventSubscriberInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * Create a snapshot when config is imported.
Chris@0:  */
Chris@0: class ConfigSnapshotSubscriber implements EventSubscriberInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * The configuration manager.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Config\ConfigManagerInterface
Chris@0:    */
Chris@0:   protected $configManager;
Chris@0: 
Chris@0:   /**
Chris@0:    * The source storage used to discover configuration changes.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Config\StorageInterface
Chris@0:    */
Chris@0:   protected $sourceStorage;
Chris@0: 
Chris@0:   /**
Chris@0:    * The snapshot storage used to write configuration changes.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Config\StorageInterface
Chris@0:    */
Chris@0:   protected $snapshotStorage;
Chris@0: 
Chris@0:   /**
Chris@0:    * Constructs the ConfigSnapshotSubscriber object.
Chris@0:    *
Chris@12:    * @param \Drupal\Core\Config\StorageInterface $source_storage
Chris@0:    *   The source storage used to discover configuration changes.
Chris@12:    * @param \Drupal\Core\Config\StorageInterface $snapshot_storage
Chris@0:    *   The snapshot storage used to write configuration changes.
Chris@0:    */
Chris@0:   public function __construct(ConfigManagerInterface $config_manager, StorageInterface $source_storage, StorageInterface $snapshot_storage) {
Chris@0:     $this->configManager = $config_manager;
Chris@0:     $this->sourceStorage = $source_storage;
Chris@0:     $this->snapshotStorage = $snapshot_storage;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Creates a config snapshot.
Chris@0:    *
Chris@0:    * @param \Drupal\Core\Config\ConfigImporterEvent $event
Chris@0:    *   The Event to process.
Chris@0:    */
Chris@0:   public function onConfigImporterImport(ConfigImporterEvent $event) {
Chris@0:     $this->configManager->createSnapshot($this->sourceStorage, $this->snapshotStorage);
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Registers the methods in this class that should be listeners.
Chris@0:    *
Chris@0:    * @return array
Chris@0:    *   An array of event listener definitions.
Chris@0:    */
Chris@0:   public static function getSubscribedEvents() {
Chris@0:     $events[ConfigEvents::IMPORT][] = ['onConfigImporterImport', 40];
Chris@0:     return $events;
Chris@0:   }
Chris@0: 
Chris@0: }