www.gusucode.com > FavShop网店系统源码程序 > FavShop网店系统 1.0/upload/cake/libs/cache/file.php
<?php
/* SVN FILE: $Id: file.php 6311 2008-01-02 06:33:52Z phpnut $ */
/**
* File Storage engine for cache
*
*
* PHP versions 4 and 5
*
* CakePHP(tm) : Rapid Development Framework <http://www.cakephp.org/>
* Copyright 2005-2008, Cake Software Foundation, Inc.
* 1785 E. Sahara Avenue, Suite 490-204
* Las Vegas, Nevada 89104
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @filesource
* @copyright Copyright 2005-2008, Cake Software Foundation, Inc.
* @link http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
* @package cake
* @subpackage cake.cake.libs.cache
* @since CakePHP(tm) v 1.2.0.4933
* @version $Revision: 6311 $
* @modifiedby $LastChangedBy: phpnut $
* @lastmodified $Date: 2008-01-02 00:33:52 -0600 (Wed, 02 Jan 2008) $
* @license http://www.opensource.org/licenses/mit-license.php The MIT License
*/
/**
* Included libraries.
*
*/
if (!class_exists('File')) {
uses ('File');
}
/**
* File Storage engine for cache
*
* @todo use the File and Folder classes (if it's not a too big performance hit)
* @package cake
* @subpackage cake.cake.libs.cache
*/
class FileEngine extends CacheEngine {
/**
* Instance of File class
*
* @var object
* @access private
*/
var $__File = null;
/**
* settings
* path = absolute path to cache directory, default => CACHE
* prefix = string prefix for filename, default => cake_
* lock = enable file locking on write, default => false
* serialize = serialize the data, default => true
*
* @var array
* @see CacheEngine::__defaults
* @access public
*/
var $settings = array();
/**
* Set to true if FileEngine::init(); and FileEngine::__active(); do not fail.
*
* @var boolean
* @access private
*/
var $__active = false;
/**
* True unless FileEngine::__active(); fails
*
* @var boolean
* @access private
*/
var $__init = true;
/**
* Initialize the Cache Engine
*
* Called automatically by the cache frontend
* To reinitialize the settings call Cache::engine('EngineName', [optional] settings = array());
*
* @param array $setting array of setting for the engine
* @return boolean True if the engine has been successfully initialized, false if not
* @access public
*/
function init($settings = array()) {
parent::init($settings);
$defaults = array('path' => CACHE, 'prefix'=> 'cake_', 'lock'=> false, 'serialize'=> true);
$this->settings = array_merge($defaults, $this->settings, $settings);
if(!isset($this->__File)) {
$this->__File =& new File($this->settings['path'] . DS . 'cake');
}
$this->settings['path'] = $this->__File->Folder->cd($this->settings['path']);
if(empty($this->settings['path'])) {
return false;
}
return $this->__active();
}
/**
* Garbage collection. Permanently remove all expired and deleted data
*
* @return boolean True if garbage collection was succesful, false on failure
* @access public
*/
function gc() {
return $this->clear(true);
}
/**
* Write data for key into cache
*
* @param string $key Identifier for the data
* @param mixed $data Data to be cached
* @param mixed $duration How long to cache the data, in seconds
* @return boolean True if the data was succesfully cached, false on failure
* @access public
*/
function write($key, &$data, $duration) {
if (empty($data) || !$this->__init) {
return false;
}
if($this->__setKey($key) === false) {
return false;
}
if ($duration == null) {
$duration = $this->settings['duration'];
}
$windows = false;
$lineBreak = "\n";
if (substr(PHP_OS, 0, 3) == "WIN") {
$lineBreak = "\r\n";
$windows = true;
}
if (!empty($this->settings['serialize'])) {
if ($windows) {
$data = str_replace('\\', '\\\\\\\\', serialize($data));
} else {
$data = serialize($data);
}
}
if ($this->settings['lock']) {
$this->__File->lock = true;
}
$expires = time() + $duration;
$contents = $expires . $lineBreak . $data . $lineBreak;
$success = $this->__File->write($contents);
$this->__File->close();
return $success;
}
/**
* Read a key from the cache
*
* @param string $key Identifier for the data
* @return mixed The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it
* @access public
*/
function read($key) {
if($this->__setKey($key) === false || !$this->__init) {
return false;
}
if ($this->settings['lock']) {
$this->__File->lock = true;
}
$cachetime = $this->__File->read(11);
if ($cachetime !== false && intval($cachetime) < time()) {
$this->__File->close();
$this->__File->delete();
return false;
}
$data = $this->__File->read(true);
if (!empty($data) && !empty($this->settings['serialize'])) {
$data = stripslashes($data);
$data = preg_replace('!s:(\d+):"(.*?)";!se', "'s:'.strlen('$2').':\"$2\";'", $data);
$data = unserialize($data);
if (is_array($data)) {
$data = array_map('stripslashes_deep', $data);
}
}
$this->__File->close();
return $data;
}
/**
* Delete a key from the cache
*
* @param string $key Identifier for the data
* @return boolean True if the value was successfully deleted, false if it didn't exist or couldn't be removed
* @access public
*/
function delete($key) {
if($this->__setKey($key) === false || !$this->__init) {
return false;
}
return $this->__File->delete();
}
/**
* Delete all values from the cache
*
* @param boolean $check Optional - only delete expired cache items
* @return boolean True if the cache was succesfully cleared, false otherwise
* @access public
*/
function clear($check) {
if (!$this->__init) {
return false;
}
$dir = dir($this->settings['path']);
if ($check) {
$now = time();
$threshold = $now - $this->settings['duration'];
}
while (($entry = $dir->read()) !== false) {
if($this->__setKey(str_replace($this->settings['prefix'], '', $entry)) === false) {
continue;
}
if ($check) {
$mtime = $this->__File->lastChange();
if ($mtime === false || $mtime > $threshold) {
continue;
}
$expires = $this->__File->read(11);
$this->__File->close();
if ($expires > $now) {
continue;
}
}
$this->__File->delete();
}
$dir->close();
return true;
}
/**
* Get absolute file for a given key
*
* @param string $key The key
* @return mixed Absolute cache file for the given key or false if erroneous
* @access private
*/
function __setKey($key) {
$this->__File->Folder->cd($this->settings['path']);
$this->__File->name = $this->settings['prefix'] . $key;
if (!$this->__File->Folder->inPath($this->__File->pwd(), true)) {
return false;
}
}
/**
* Determine is cache directory is writable
*
* @return boolean
* @access private
*/
function __active() {
if (!$this->__active && $this->__init && !is_writable($this->settings['path'])) {
$this->__init = false;
trigger_error(sprintf(__('%s is not writable', true), $this->settings['path']), E_USER_WARNING);
} else {
$this->__active = true;
}
return true;
}
}
?>