diff core/lib/Drupal/Core/EventSubscriber/ConfigSnapshotSubscriber.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Core/EventSubscriber/ConfigSnapshotSubscriber.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,72 @@
+<?php
+
+namespace Drupal\Core\EventSubscriber;
+
+use Drupal\Core\Config\ConfigEvents;
+use Drupal\Core\Config\ConfigManagerInterface;
+use Drupal\Core\Config\StorageInterface;
+use Drupal\Core\Config\ConfigImporterEvent;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Create a snapshot when config is imported.
+ */
+class ConfigSnapshotSubscriber implements EventSubscriberInterface {
+
+  /**
+   * The configuration manager.
+   *
+   * @var \Drupal\Core\Config\ConfigManagerInterface
+   */
+  protected $configManager;
+
+  /**
+   * The source storage used to discover configuration changes.
+   *
+   * @var \Drupal\Core\Config\StorageInterface
+   */
+  protected $sourceStorage;
+
+  /**
+   * The snapshot storage used to write configuration changes.
+   *
+   * @var \Drupal\Core\Config\StorageInterface
+   */
+  protected $snapshotStorage;
+
+  /**
+   * Constructs the ConfigSnapshotSubscriber object.
+   *
+   * @param StorageInterface $source_storage
+   *   The source storage used to discover configuration changes.
+   * @param StorageInterface $snapshot_storage
+   *   The snapshot storage used to write configuration changes.
+   */
+  public function __construct(ConfigManagerInterface $config_manager, StorageInterface $source_storage, StorageInterface $snapshot_storage) {
+    $this->configManager = $config_manager;
+    $this->sourceStorage = $source_storage;
+    $this->snapshotStorage = $snapshot_storage;
+  }
+
+  /**
+   * Creates a config snapshot.
+   *
+   * @param \Drupal\Core\Config\ConfigImporterEvent $event
+   *   The Event to process.
+   */
+  public function onConfigImporterImport(ConfigImporterEvent $event) {
+    $this->configManager->createSnapshot($this->sourceStorage, $this->snapshotStorage);
+  }
+
+  /**
+   * Registers the methods in this class that should be listeners.
+   *
+   * @return array
+   *   An array of event listener definitions.
+   */
+  public static function getSubscribedEvents() {
+    $events[ConfigEvents::IMPORT][] = ['onConfigImporterImport', 40];
+    return $events;
+  }
+
+}