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<?php
// +----------------------------------------------------------------------+
// | PEAR :: Cache |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2004 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.0 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Ulf Wendel <ulf.wendel@phpdoc.de> |
// | Sebastian Bergmann <sb@sebastian-bergmann.de> |
// | Ian Eure <ieure@php.net> |
// +----------------------------------------------------------------------+
//
// $Id: trifile.php 184642 2005-04-18 19:05:01Z dufuz $
require_once 'Cache/Container/file.php';
/**
* Tri-file cache.
*
* This cache container stores files with no special encoding to reduce overhead.
* Expiration & user data are stored in seperate files, prefixed with a '.' and
* suffixed with '.exp' & '.dat' respectively.
*
* See http://atomized.org/PEAR/Cache_trifile.html for more information.
*
* @author Ian Eure <ieure@php.net>
* @version 1.0
*/
class Cache_Container_trifile extends Cache_Container_file
{
/**
* Fetch cached file.
*
* @param string $id Cache ID to fetch
* @param string $group Group to fetch from
* @return array 1-dimensional array in the format: expiration,data,userdata
*/
function fetch($id, $group)
{
$file = $this->getFilename($id, $group);
if (PEAR::isError($file)) {
return $file;
}
if (!file_exists($file)) {
return array(null, null, null);
}
return array(
file_get_contents($this->_getExpFile($file)),
file_get_contents($file),
file_get_contents($this->_getUDFile($file))
);
}
/**
* Get the file to store cache data in.
*
* @return string Cache data file name
* @access private
*/
function _getFile($file)
{
$dir = dirname($file);
$file = basename($file);
return $dir.'/.'.$file;
}
/**
* Get the file to store expiration data in.
*
* @return string Expiration data file name
* @access private
*/
function _getExpFile($file)
{
return $this->_getFile($file).'.exp';
}
/**
* Get the file to store user data in.
*
* @return string User data file name
* @access private
*/
function _getUDFile($file)
{
return $this->_getFile($file).'.dat';
}
/**
* Cache file
*
* @param string $id Cache ID
* @param mixed $cachedata Data to cache
* @param mixed $expires When the data expires
* @param string $group Cache group to store data in
* @param mixed $userdata Additional data to store
* @return boolean true on success, false otherwise
*/
function save($id, $cachedata, $expires, $group, $userdata)
{
$this->flushPreload($id, $group);
$file = $this->getFilename($id, $group);
if (PEAR::isError($file)) {
return $file;
}
if (PEAR::isError($res = $this->_saveData($file, $cachedata))) {
return $res;
}
$expires = $this->getExpiresAbsolute($expires);
if (PEAR::isError($res = $this->_saveData($this->_getExpFile($file), $expires))) {
return $res;
}
if (PEAR::isError($res = $this->_saveData($this->_getUDFile($file), $userdata))) {
return $res;
}
return true;
}
/**
* Save data in a file
*
* @param string $file File to save data in
* @param string $data Data to save
* @return mixed true on success, Cache_Error otherwise
*/
function _saveData($file, $data)
{
// Save data
if (!($fh = @fopen($file, 'wb')))
return new Cache_Error("Can't access '$file' to store cache data. Check access rights and path.", __FILE__, __LINE__);
if ($this->fileLocking) {
flock($fh, LOCK_EX);
}
fwrite($fh, $data);
if ($this->fileLocking) {
flock($fh, LOCK_UN);
}
fclose($fh);
return true;
}
}
?>
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