1 files changed, 25 insertions, 0 deletions
diff --git a/lib/public/DB/QueryBuilder/Sharded/IShardMapper.php b/lib/public/DB/QueryBuilder/Sharded/IShardMapper.php
new file mode 100644
index 00000000000..fa00fb68719
--- /dev/null
+++ b/lib/public/DB/QueryBuilder/Sharded/IShardMapper.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2024 Robin Appelman <robin@icewind.nl>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCP\DB\QueryBuilder\Sharded;
+
+/**
+ * Implementation of logic of mapping shard keys to shards.
+ * @since 30.0.0
+ */
+interface IShardMapper {
+	/**
+	 * Get the shard number for a given shard key and total shard count
+	 *
+	 * @param int $key
+	 * @param int $count
+	 * @return int
+	 * @since 30.0.0
+	 */
+	public function getShardForKey(int $key, int $count): int;
+}