Move all caching to helper

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/Cache/AttachmentCacheHelper.php

@@ -0,0 +1,52 @@
+<?php
+
+/*
+ * @copyright Copyright (c) 2020 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+declare(strict_types=1);
+
+
+namespace OCA\Deck\Cache;
+
+use OCP\ICache;
+use OCP\ICacheFactory;
+
+class AttachmentCacheHelper {
+	/** @var ICache */
+	private $cache;
+
+	public function __construct(ICacheFactory $cacheFactory) {
+		$this->cache = $cacheFactory->createDistributed('deck-attachments');
+	}
+
+	public function getAttachmentCount(int $cardId): ?int {
+		return $this->cache->get('count-' . $cardId);
+	}
+
+	public function setAttachmentCount(int $cardId, int $count): void {
+		$this->cache->set('count-' . $cardId, $count);
+	}
+
+	public function clearAttachmentCount(int $cardId): void {
+		$this->cache->remove('count-' . $cardId);
+	}
+}