src/Core/Cache/TraitCompareDelete.php

   1 <?php
   2
   3 namespace Friendica\Core\Cache;
   4
   5 /**
   6  * Trait TraitCompareSetDelete
   7  *
   8  * This Trait is to compensate non native "exclusive" sets/deletes in caches
   9  *
  10  * @package Friendica\Core\Cache
  11  */
  12 trait TraitCompareDelete
  13 {
  14         abstract public function get($key);
  15
  16         abstract public function set($key, $value, $ttl = Cache::FIVE_MINUTES);
  17
  18         abstract public function delete($key);
  19
  20         abstract public function add($key, $value, $ttl = Cache::FIVE_MINUTES);
  21
  22         /**
  23          * NonNative - Compares if the old value is set and removes it
  24          *
  25          * @param string $key          The cache key
  26          * @param mixed  $value        The old value we know and want to delete
  27          * @return bool
  28          */
  29         public function compareDelete($key, $value) {
  30                 if ($this->add($key . "_lock", true)) {
  31                         if ($this->get($key) === $value) {
  32                                 $this->delete($key);
  33                                 $this->delete($key . "_lock");
  34                                 return true;
  35                         } else {
  36                                 $this->delete($key . "_lock");
  37                                 return false;
  38                         }
  39                 } else {
  40                         return false;
  41                 }
  42         }
  43 }