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<?php
/**
* APC class
*/
if (!defined('W3TC')) {
die();
}
w3_require_once(W3TC_LIB_W3_DIR . '/Cache/Base.php');
/**
* Class W3_Cache_Apc
*/
class W3_Cache_Apc extends W3_Cache_Base {
/*
* Used for faster flushing
*
* @var integer $_key_version
*/
private $_key_version = array();
/**
* Adds data
*
* @param string $key
* @param mixed $var
* @param integer $expire
* @param string $group Used to differentiate between groups of cache values
* @return boolean
*/
function add($key, &$var, $expire = 0, $group = '0') {
if ($this->get($key, $group) === false) {
return $this->set($key, $var, $expire, $group);
}
return false;
}
/**
* Sets data
*
* @param string $key
* @param mixed $var
* @param integer $expire
* @param string $group Used to differentiate between groups of cache values
* @return boolean
*/
function set($key, $var, $expire = 0, $group = '0') {
$key = $this->get_item_key($key);
$var['key_version'] = $this->_get_key_version($group);
return apc_store($key . '_' . $this->_blog_id, serialize($var), $expire);
}
/**
* Returns data
*
* @param string $key
* @param string $group Used to differentiate between groups of cache values
* @return mixed
*/
function get_with_old($key, $group = '0') {
$has_old_data = false;
$key = $this->get_item_key($key);
$v = @unserialize(apc_fetch($key . '_' . $this->_blog_id));
if (!is_array($v) || !isset($v['key_version']))
return array(null, $has_old_data);
$key_version = $this->_get_key_version($group);
if ($v['key_version'] == $key_version)
return array($v, $has_old_data);
if ($v['key_version'] > $key_version) {
$this->_set_key_version($v['key_version'], $group);
return array($v, $has_old_data);
}
// key version is old
if (!$this->_use_expired_data)
return array(null, $has_old_data);
// if we have expired data - update it for future use and let
// current process recalculate it
$expires_at = isset($v['expires_at']) ? $v['expires_at'] : null;
if ($expires_at == null || time() > $expires_at) {
$v['expires_at'] = time() + 30;
apc_store($key . '_' . $this->_blog_id, serialize($v), 0);
$has_old_data = true;
return array(null, $has_old_data);
}
// return old version
return array($v, $has_old_data);
}
/**
* Replaces data
*
* @param string $key
* @param mixed $var
* @param integer $expire
* @param string $group Used to differentiate between groups of cache values
* @return boolean
*/
function replace($key, &$var, $expire = 0, $group ='0') {
if ($this->get($key, $group) !== false) {
return $this->set($key, $var, $expire, $group);
}
return false;
}
/**
* Deletes data
*
* @param string $key
* @param string $group
* @return boolean
*/
function delete($key, $group = '') {
$key = $this->get_item_key($key);
if ($this->_use_expired_data) {
$v = @unserialize(apc_fetch($key . '_' . $this->_blog_id));
if (is_array($v)) {
$v['key_version'] = 0;
apc_store($key . '_' . $this->_blog_id, serialize($v), 0);
return true;
}
}
return apc_delete($key . '_' . $this->_blog_id);
}
/**
* Key to delete, deletes .old and primary if exists.
* @param $key
* @return bool
*/
function hard_delete($key) {
$key = $this->get_item_key($key);
return apc_delete($key . '_' . $this->_blog_id);
}
/**
* Flushes all data
*
* @param string $group Used to differentiate between groups of cache values
* @return boolean
*/
function flush($group = '0') {
$this->_get_key_version($group); // initialize $this->_key_version
$this->_key_version[$group]++;
$this->_set_key_version($this->_key_version[$group], $group);
return true;
}
/**
* Checks if engine can function properly in this environment
* @return bool
*/
public function available() {
return function_exists('apc_store');
}
/**
* Returns key postfix
*
* @param string $group Used to differentiate between groups of cache values
* @return integer
*/
private function _get_key_version($group = '0') {
if (!isset($this->_key_version[$group]) || $this->_key_version[$group] <= 0) {
$v = apc_fetch($this->_get_key_version_key($group));
$v = intval($v);
$this->_key_version[$group] = ($v > 0 ? $v : 1);
}
return $this->_key_version[$group];
}
/**
* Sets new key version
*
* @param $v
* @param string $group Used to differentiate between groups of cache values
* @return boolean
*/
private function _set_key_version($v, $group = '0') {
apc_store($this->_get_key_version_key($group), $v, 0);
}
}
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