131 lines
2.5 KiB
PHP
131 lines
2.5 KiB
PHP
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<?php
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/**
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* Class Minify_Cache_APC
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* @package Minify
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*/
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/**
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* APC-based cache class for Minify
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*
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* <code>
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* Minify::setCache(new Minify_Cache_APC());
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* </code>
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*
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* @package Minify
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* @author Chris Edwards
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**/
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class Minify_Cache_APC {
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/**
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* Create a Minify_Cache_APC object, to be passed to
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* Minify::setCache().
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*
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*
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* @param int $expire seconds until expiration (default = 0
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* meaning the item will not get an expiration date)
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*
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* @return null
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*/
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public function __construct($expire = 0)
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{
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$this->_exp = $expire;
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}
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/**
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* Write data to cache.
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*
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* @param string $id cache id
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*
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* @param string $data
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*
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* @return bool success
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*/
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public function store($id, $data)
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{
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return apc_store($id, "{$_SERVER['REQUEST_TIME']}|{$data}", $this->_exp);
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}
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/**
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* Get the size of a cache entry
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*
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* @param string $id cache id
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*
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* @return int size in bytes
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*/
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public function getSize($id)
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{
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return $this->_fetch($id)
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? strlen($this->_data)
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: false;
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}
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/**
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* Does a valid cache entry exist?
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*
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* @param string $id cache id
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*
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* @param int $srcMtime mtime of the original source file(s)
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*
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* @return bool exists
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*/
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public function isValid($id, $srcMtime)
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{
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return ($this->_fetch($id) && ($this->_lm >= $srcMtime));
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}
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/**
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* Send the cached content to output
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*
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* @param string $id cache id
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*/
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public function display($id)
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{
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echo $this->_fetch($id)
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? $this->_data
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: '';
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}
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/**
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* Fetch the cached content
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*
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* @param string $id cache id
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*
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* @return string
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*/
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public function fetch($id)
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{
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return $this->_fetch($id)
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? $this->_data
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: '';
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}
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private $_exp = null;
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// cache of most recently fetched id
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private $_lm = null;
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private $_data = null;
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private $_id = null;
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/**
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* Fetch data and timestamp from apc, store in instance
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*
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* @param string $id
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*
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* @return bool success
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*/
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private function _fetch($id)
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{
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if ($this->_id === $id) {
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return true;
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}
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$ret = apc_fetch($id);
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if (false === $ret) {
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$this->_id = null;
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return false;
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}
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list($this->_lm, $this->_data) = explode('|', $ret, 2);
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$this->_id = $id;
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return true;
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}
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}
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