/** * Performs a "check and set" to store data. * * The set will be successful only if the no other request has updated the value since it was fetched since * this request. * * @link http://www.php.net/manual/en/memcached.cas.php * * @param float $cas_token Unique value associated with the existing item. Generated by memcached. * @param string $key The key under which to store the value. * @param mixed $value The value to store. * @param string $group The group value appended to the $key. * @param int $expiration The expiration time, defaults to 0. * @param string $server_key The key identifying the server to store the value on. * @param bool $byKey True to store in internal cache by key; false to not store by key * @return bool Returns TRUE on success or FALSE on failure. */ public function cas($cas_token, $key, $value, $group = 'default', $expiration = 0, $server_key = '', $byKey = false) { $derived_key = $this->buildKey($key, $group); $expiration = $this->sanitize_expiration($expiration); /** * If group is a non-Memcached group, save to runtime cache, not Memcached. Note * that since check and set cannot be emulated in the run time cache, this value * operation is treated as a normal "add" for no_mc_groups. */ if (in_array($group, $this->no_mc_groups)) { $this->add_to_internal_cache($derived_key, $value); return true; } // Save to Memcached if (false !== $byKey) { $result = $this->mc->casByKey($cas_token, $server_key, $derived_key, $value, $expiration); } else { $result = $this->mc->cas($cas_token, $derived_key, $value, $expiration); } // Store in runtime cache if cas was successful if (Memcached::RES_SUCCESS === $this->getResultCode()) { $this->add_to_internal_cache($derived_key, $value); } return $result; }
/** * @inheritdoc */ public function casByKey($cas_token, $server_key, $key, $value, $expiration = null) { $key = $this->prefix . $key; return parent::casByKey($cas_token, $server_key, $key, $value, $expiration = null); }