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<?php
/**
* SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
* SPDX-FileCopyrightText: 2016 ownCloud, Inc.
* SPDX-License-Identifier: AGPL-3.0-only
*/
namespace OC\Memcache;
trait CADTrait {
abstract public function get($key);
abstract public function remove($key);
abstract public function add($key, $value, $ttl = 0);
/**
* Compare and delete
*
* @param string $key
* @param mixed $old
* @return bool
*/
public function cad($key, $old) {
//no native cas, emulate with locking
if ($this->add($key . '_lock', true)) {
if ($this->get($key) === $old) {
$this->remove($key);
$this->remove($key . '_lock');
return true;
} else {
$this->remove($key . '_lock');
return false;
}
} else {
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;
}
}
}
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