friendica/src/Core/Cache/TraitCompareDelete.php

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<?php
namespace Friendica\Core\Cache;
use Friendica\Core\Cache;
/**
* Trait TraitCompareSetDelete
*
* @brief This Trait is to compensate non native "exclusive" sets/deletes in caches
*
* @package Friendica\Core\Cache
*/
trait TraitCompareDelete
{
abstract public function get($key);
abstract public function set($key, $value, $ttl = Cache::FIVE_MINUTES);
abstract public function delete($key);
abstract public function add($key, $value, $ttl = Cache::FIVE_MINUTES);
/**
* @brief NonNative - Compares if the old value is set and removes it
*
* @param string $key The cache key
* @param mixed $value The old value we know and want to delete
* @return bool
*/
public function compareDelete($key, $value) {
if ($this->add($key . "_lock", true)) {
if ($this->get($key) === $value) {
$this->delete($key);
$this->delete($key . "_lock");
return true;
} else {
$this->delete($key . "_lock");
return false;
}
} else {
return false;
}
}
}