1 files changed, 18 insertions, 0 deletions
diff --git a/lib/private/Memcache/CADTrait.php b/lib/private/Memcache/CADTrait.php
index bb010e238dc..d0f6611c4f3 100644
--- a/lib/private/Memcache/CADTrait.php
+++ b/lib/private/Memcache/CADTrait.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
  * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
@@ -35,4 +36,21 @@ trait CADTrait {
 			return false;
 		}
 	}
+
+	public function ncad(string $key, mixed $old): bool {
+		//no native cad, emulate with locking
+		if ($this->add($key . '_lock', true)) {
+			$value = $this->get($key);
+			if ($value !== null && $value !== $old) {
+				$this->remove($key);
+				$this->remove($key . '_lock');
+				return true;
+			} else {
+				$this->remove($key . '_lock');
+				return false;
+			}
+		} else {
+			return false;
+		}
+	}
 }