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