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<?php
/**
* APC storage engine for cache.
*
*
* PHP 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package Cake.Cache.Engine
* @since CakePHP(tm) v 1.2.0.4933
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/
/**
* APC storage engine for cache
*
* @package Cake.Cache.Engine
*/
class ApcEngine extends CacheEngine {
/**
* Initialize the Cache Engine
*
* Called automatically by the cache frontend
* To reinitialize the settings call Cache::engine('EngineName', [optional] settings = array());
*
* @param array $settings array of setting for the engine
* @return boolean True if the engine has been successfully initialized, false if not
* @see CacheEngine::__defaults
*/
public function init($settings = array()) {
parent::init(array_merge(array('engine' => 'Apc', 'prefix' => Inflector::slug(APP_DIR) . '_'), $settings));
return function_exists('apc_dec');
}
/**
* Write data for key into cache
*
* @param string $key Identifier for the data
* @param mixed $value Data to be cached
* @param integer $duration How long to cache the data, in seconds
* @return boolean True if the data was successfully cached, false on failure
*/
public function write($key, $value, $duration) {
if ($duration == 0) {
$expires = 0;
} else {
$expires = time() + $duration;
}
apc_store($key . '_expires', $expires, $duration);
return apc_store($key, $value, $duration);
}
/**
* Read a key from the cache
*
* @param string $key Identifier for the data
* @return mixed The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it
*/
public function read($key) {
$time = time();
$cachetime = intval(apc_fetch($key . '_expires'));
if ($cachetime !== 0 && ($cachetime < $time || ($time + $this->settings['duration']) < $cachetime)) {
return false;
}
return apc_fetch($key);
}
/**
* Increments the value of an integer cached key
*
* @param string $key Identifier for the data
* @param integer $offset How much to increment
* @return New incremented value, false otherwise
*/
public function increment($key, $offset = 1) {
return apc_inc($key, $offset);
}
/**
* Decrements the value of an integer cached key
*
* @param string $key Identifier for the data
* @param integer $offset How much to subtract
* @return New decremented value, false otherwise
*/
public function decrement($key, $offset = 1) {
return apc_dec($key, $offset);
}
/**
* Delete a key from the cache
*
* @param string $key Identifier for the data
* @return boolean True if the value was successfully deleted, false if it didn't exist or couldn't be removed
*/
public function delete($key) {
return apc_delete($key);
}
/**
* Delete all keys from the cache. This will clear every cache config using APC.
*
* @param boolean $check If true, nothing will be cleared, as entries are removed
* from APC as they expired. This flag is really only used by FileEngine.
* @return boolean True Returns true.
*/
public function clear($check) {
if ($check) {
return true;
}
$info = apc_cache_info('user');
$cacheKeys = $info['cache_list'];
unset($info);
foreach ($cacheKeys as $key) {
if (strpos($key['info'], $this->settings['prefix']) === 0) {
apc_delete($key['info']);
}
}
return true;
}
/**
* Returns the `group value` for each of the configured groups
* If the group initial value was not found, then it initializes
* the group accordingly.
*
* @return array
**/
public function groups() {
$groups = apc_fetch($this->settings['groups']);
if (count($groups) !== count($this->settings['groups'])) {
foreach ($this->settings['groups'] as $group) {
if (!isset($groups[$group])) {
apc_store($group, 1);
$groups[$group] = 1;
}
}
ksort($groups);
}
$result = array();
foreach ($groups as $group => $value) {
$result[] = $group . $value;
}
return $result;
}
/**
* Increments the group value to simulate deletion of all keys under a group
* old values will remain in sotrage until they expire.
*
* @return boolean success
**/
public function clearGroup($group) {
apc_inc($group, 1, $success);
return $success;
}
}
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