diff core/modules/block_content/src/BlockContentUuidLookup.php @ 0:c75dbcec494b

Initial commit from drush-created site

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/modules/block_content/src/BlockContentUuidLookup.php	Thu Jul 05 14:24:15 2018 +0000
@@ -0,0 +1,63 @@
+<?php
+
+namespace Drupal\block_content;
+
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Cache\CacheCollector;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\Lock\LockBackendInterface;
+
+/**
+ * A cache collector that caches IDs for block_content UUIDs.
+ *
+ * As block_content entities are used as block plugin derivatives, it is a
+ * fairly safe limitation that there are not hundreds of them, a site will
+ * likely run into problems with too many block content entities in other places
+ * than a cache that only stores UUID's and IDs. The same assumption is not true
+ * for other content entities.
+ *
+ * @internal
+ */
+class BlockContentUuidLookup extends CacheCollector {
+
+  /**
+   * The entity type manager.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  protected $entityTypeManager;
+
+  /**
+   * Constructs a BlockContentUuidLookup instance.
+   *
+   * @param \Drupal\Core\Cache\CacheBackendInterface $cache
+   *   The cache backend.
+   * @param \Drupal\Core\Lock\LockBackendInterface $lock
+   *   The lock backend.
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+   *   The entity type manager.
+   */
+  public function __construct(CacheBackendInterface $cache, LockBackendInterface $lock, EntityTypeManagerInterface $entity_type_manager) {
+    parent::__construct('block_content_uuid', $cache, $lock);
+    $this->entityTypeManager = $entity_type_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function resolveCacheMiss($key) {
+    $ids = $this->entityTypeManager->getStorage('block_content')->getQuery()
+      ->condition('uuid', $key)
+      ->execute();
+
+    // Only cache if there is a match, otherwise creating new entities would
+    // require to invalidate the cache.
+    $id = reset($ids);
+    if ($id) {
+      $this->storage[$key] = $id;
+      $this->persist($key);
+    }
+    return $id;
+  }
+
+}