src/Core/Cache/TraitCompareDelete.php

   1 <?php
   2
   3 namespace Friendica\Core\Cache;
   4
   5 use Friendica\Core\Cache;
   6
   7 /**
   8  * Trait TraitCompareSetDelete
   9  *
  10  * This Trait is to compensate non native "exclusive" sets/deletes in caches
  11  *
  12  * @package Friendica\Core\Cache
  13  */
  14 trait TraitCompareDelete
  15 {
  16         abstract public function get($key);
  17
  18         abstract public function set($key, $value, $ttl = Cache::FIVE_MINUTES);
  19
  20         abstract public function delete($key);
  21
  22         abstract public function add($key, $value, $ttl = Cache::FIVE_MINUTES);
  23
  24         /**
  25          * NonNative - Compares if the old value is set and removes it
  26          *
  27          * @param string $key          The cache key
  28          * @param mixed  $value        The old value we know and want to delete
  29          * @return bool
  30          */
  31         public function compareDelete($key, $value) {
  32                 if ($this->add($key . "_lock", true)) {
  33                         if ($this->get($key) === $value) {
  34                                 $this->delete($key);
  35                                 $this->delete($key . "_lock");
  36                                 return true;
  37                         } else {
  38                                 $this->delete($key . "_lock");
  39                                 return false;
  40                         }
  41                 } else {
  42                         return false;
  43                 }
  44         }
  45 }