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<?php
/**
* Class Minify_Cache_Wincache
* @package Minify
*/
/**
* WinCache-based cache class for Minify
*
* <code>
* Minify::setCache(new Minify_Cache_WinCache());
* </code>
*
* @package Minify
* @author Matthias Fax
**/
class Minify_Cache_WinCache implements Minify_CacheInterface
{
/**
* Create a Minify_Cache_Wincache object, to be passed to
* Minify::setCache().
*
* @param int $expire seconds until expiration (default = 0
* meaning the item will not get an expiration date)
*
* @throws Exception
*/
public function __construct($expire = 0)
{
if (!function_exists('wincache_ucache_info')) {
throw new Exception("WinCache for PHP is not installed to be able to use Minify_Cache_WinCache!");
}
$this->_exp = $expire;
}
/**
* Write data to cache.
*
* @param string $id cache id
*
* @param string $data
*
* @return bool success
*/
public function store($id, $data)
{
return wincache_ucache_set($id, "{$_SERVER['REQUEST_TIME']}|{$data}", $this->_exp);
}
/**
* Get the size of a cache entry
*
* @param string $id cache id
*
* @return int size in bytes
*/
public function getSize($id)
{
if (!$this->_fetch($id)) {
return false;
}
if (function_exists('mb_strlen') && ((int) ini_get('mbstring.func_overload') & 2)) {
return mb_strlen($this->_data, '8bit');
} else {
return strlen($this->_data);
}
}
/**
* Does a valid cache entry exist?
*
* @param string $id cache id
*
* @param int $srcMtime mtime of the original source file(s)
*
* @return bool exists
*/
public function isValid($id, $srcMtime)
{
return ($this->_fetch($id) && ($this->_lm >= $srcMtime));
}
/**
* Send the cached content to output
*
* @param string $id cache id
*/
public function display($id)
{
echo $this->_fetch($id) ? $this->_data : '';
}
/**
* Fetch the cached content
*
* @param string $id cache id
*
* @return string
*/
public function fetch($id)
{
return $this->_fetch($id) ? $this->_data : '';
}
private $_exp = null;
// cache of most recently fetched id
private $_lm = null;
private $_data = null;
private $_id = null;
/**
* Fetch data and timestamp from WinCache, store in instance
*
* @param string $id
*
* @return bool success
*/
private function _fetch($id)
{
if ($this->_id === $id) {
return true;
}
$suc = false;
$ret = wincache_ucache_get($id, $suc);
if (!$suc) {
$this->_id = null;
return false;
}
list($this->_lm, $this->_data) = explode('|', $ret, 2);
$this->_id = $id;
return true;
}
}
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