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- <?php
- /**
- * Class Minify_Cache_Memcache
- * @package Minify
- */
- /**
- * Memcache-based cache class for Minify
- *
- * <code>
- * // fall back to disk caching if memcache can't connect
- * $memcache = new Memcache;
- * if ($memcache->connect('localhost', 11211)) {
- * Minify::setCache(new Minify_Cache_Memcache($memcache));
- * } else {
- * Minify::setCache();
- * }
- * </code>
- **/
- class Minify_Cache_Memcache {
-
- /**
- * Create a Minify_Cache_Memcache object, to be passed to
- * Minify::setCache().
- *
- * @param Memcache $memcache already-connected instance
- *
- * @param int $expire seconds until expiration (default = 0
- * meaning the item will not get an expiration date)
- *
- * @return null
- */
- public function __construct($memcache, $expire = 0)
- {
- $this->_mc = $memcache;
- $this->_exp = $expire;
- }
-
- /**
- * Write data to cache.
- *
- * @param string $id cache id
- *
- * @param string $data
- *
- * @return bool success
- */
- public function store($id, $data)
- {
- return $this->_mc->set($id, "{$_SERVER['REQUEST_TIME']}|{$data}", 0, $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;
- }
- return (function_exists('mb_strlen') && ((int)ini_get('mbstring.func_overload') & 2))
- ? mb_strlen($this->_data, '8bit')
- : strlen($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 $_mc = null;
- private $_exp = null;
-
- // cache of most recently fetched id
- private $_lm = null;
- private $_data = null;
- private $_id = null;
-
- /**
- * Fetch data and timestamp from memcache, store in instance
- *
- * @param string $id
- *
- * @return bool success
- */
- private function _fetch($id)
- {
- if ($this->_id === $id) {
- return true;
- }
- $ret = $this->_mc->get($id);
- if (false === $ret) {
- $this->_id = null;
- return false;
- }
- list($this->_lm, $this->_data) = explode('|', $ret, 2);
- $this->_id = $id;
- return true;
- }
- }
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