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<?php
/**
* @version $Id:storage.php 6961 2007-03-15 16:06:53Z tcp $
* @package Joomla.Framework
* @subpackage Cache
* @copyright Copyright (C) 2005 - 2010 Open Source Matters. All rights reserved.
* @license GNU/GPL, see LICENSE.php
* Joomla! is free software. This version may have been modified pursuant
* to the GNU General Public License, and as distributed it includes or
* is derivative of works licensed under the GNU General Public License or
* other free or open source software licenses.
* See COPYRIGHT.php for copyright notices and details.
*/
// Check to ensure this file is within the rest of the framework
defined('JPATH_BASE') or die();
/**
* Abstract cache storage handler
*
* @abstract
* @package Joomla.Framework
* @subpackage Cache
* @since 1.5
*/
class JCacheStorage extends JObject
{
/**
* Constructor
*
* @access protected
* @param array $options optional parameters
*/
function __construct( $options = array() )
{
$this->_application = (isset($options['application'])) ? $options['application'] : null;
$this->_language = (isset($options['language'])) ? $options['language'] : 'en-GB';
$this->_locking = (isset($options['locking'])) ? $options['locking'] : true;
$this->_lifetime = (isset($options['lifetime'])) ? $options['lifetime'] : null;
$this->_now = (isset($options['now'])) ? $options['now'] : time();
// Set time threshold value. If the lifetime is not set, default to 60 (0 is BAD)
// _threshold is now available ONLY as a legacy (it's deprecated). It's no longer used in the core.
if (empty($this->_lifetime)) {
$this->_threshold = $this->_now - 60;
$this->_lifetime = 60;
} else {
$this->_threshold = $this->_now - $this->_lifetime;
}
}
/**
* Returns a reference to a cache storage hanlder object, only creating it
* if it doesn't already exist.
*
* @static
* @param string $handler The cache storage handler to instantiate
* @return object A JCacheStorageHandler object
* @since 1.5
*/
function &getInstance($handler = 'file', $options = array())
{
static $now = null;
if(is_null($now)) {
$now = time();
}
$options['now'] = $now;
//We can't cache this since options may change...
$handler = strtolower(preg_replace('/[^A-Z0-9_\.-]/i', '', $handler));
$class = 'JCacheStorage'.ucfirst($handler);
if(!class_exists($class))
{
$path = dirname(__FILE__).DS.'storage'.DS.$handler.'.php';
if (file_exists($path) ) {
require_once($path);
} else {
return JError::raiseWarning(500, 'Unable to load Cache Storage: '.$handler);
}
}
$return = new $class($options);
return $return;
}
/**
* Get cached data by id and group
*
* @abstract
* @access public
* @param string $id The cache data id
* @param string $group The cache data group
* @param boolean $checkTime True to verify cache time expiration threshold
* @return mixed Boolean false on failure or a cached data string
* @since 1.5
*/
function get($id, $group, $checkTime)
{
return;
}
/**
* Store the data to cache by id and group
*
* @abstract
* @access public
* @param string $id The cache data id
* @param string $group The cache data group
* @param string $data The data to store in cache
* @return boolean True on success, false otherwise
* @since 1.5
*/
function store($id, $group, $data)
{
return true;
}
/**
* Remove a cached data entry by id and group
*
* @abstract
* @access public
* @param string $id The cache data id
* @param string $group The cache data group
* @return boolean True on success, false otherwise
* @since 1.5
*/
function remove($id, $group)
{
return true;
}
/**
* Clean cache for a group given a mode.
*
* group mode : cleans all cache in the group
* notgroup mode : cleans all cache not in the group
*
* @abstract
* @access public
* @param string $group The cache data group
* @param string $mode The mode for cleaning cache [group|notgroup]
* @return boolean True on success, false otherwise
* @since 1.5
*/
function clean($group, $mode)
{
return true;
}
/**
* Garbage collect expired cache data
*
* @abstract
* @access public
* @return boolean True on success, false otherwise.
*/
function gc()
{
return true;
}
/**
* Test to see if the storage handler is available.
*
* @abstract
* @static
* @access public
* @return boolean True on success, false otherwise.
*/
function test()
{
return true;
}
}