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<?php
/**
* @package Joomla.Platform
* @subpackage Cache
*
* @copyright Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* Joomla! Cache page type object
*
* @package Joomla.Platform
* @subpackage Cache
* @since 11.1
*/
class JCacheControllerPage extends JCacheController
{
/**
* @var integer ID property for the cache page object.
* @since 11.1
*/
protected $_id;
/**
* @var string Cache group
* @since 11.1
*/
protected $_group;
/**
* @var object Cache lock test
* @since 11.1
*/
protected $_locktest = null;
/**
* Get the cached page data
*
* @param string $id The cache data id
* @param string $group The cache data group
* @param boolean $wrkarounds True to use wrkarounds
*
* @return boolean True if the cache is hit (false else)
*
* @since 11.1
*/
public function get($id = false, $group = 'page', $wrkarounds = true)
{
// Initialise variables.
$data = false;
// If an id is not given, generate it from the request
if ($id == false)
{
$id = $this->_makeId();
}
// If the etag matches the page id ... set a no change header and exit : utilize browser cache
if (!headers_sent() && isset($_SERVER['HTTP_IF_NONE_MATCH']))
{
$etag = stripslashes($_SERVER['HTTP_IF_NONE_MATCH']);
if ($etag == $id)
{
$browserCache = isset($this->options['browsercache']) ? $this->options['browsercache'] : false;
if ($browserCache)
{
$this->_noChange();
}
}
}
// We got a cache hit... set the etag header and echo the page data
$data = $this->cache->get($id, $group);
$this->_locktest = new stdClass;
$this->_locktest->locked = null;
$this->_locktest->locklooped = null;
if ($data === false)
{
$this->_locktest = $this->cache->lock($id, $group);
if ($this->_locktest->locked == true && $this->_locktest->locklooped == true)
{
$data = $this->cache->get($id, $group);
}
}
if ($data !== false)
{
$data = unserialize(trim($data));
if ($wrkarounds === true)
{
$data = JCache::getWorkarounds($data);
}
$this->_setEtag($id);
if ($this->_locktest->locked == true)
{
$this->cache->unlock($id, $group);
}
return $data;
}
// Set id and group placeholders
$this->_id = $id;
$this->_group = $group;
return false;
}
/**
* Stop the cache buffer and store the cached data
*
* @param boolean $wrkarounds True to use wrkarounds
*
* @return boolean True if cache stored
*
* @since 11.1
*/
public function store($wrkarounds = true)
{
// Get page data from JResponse body
$data = JResponse::getBody();
// Get id and group and reset the placeholders
$id = $this->_id;
$group = $this->_group;
$this->_id = null;
$this->_group = null;
// Only attempt to store if page data exists
if ($data)
{
$data = $wrkarounds == false ? $data : JCache::setWorkarounds($data);
if ($this->_locktest->locked == false)
{
$this->_locktest = $this->cache->lock($id, $group);
}
$sucess = $this->cache->store(serialize($data), $id, $group);
if ($this->_locktest->locked == true)
{
$this->cache->unlock($id, $group);
}
return $sucess;
}
return false;
}
/**
* Generate a page cache id
*
* @return string MD5 Hash : page cache id
*
* @since 11.1
* @todo Discuss whether this should be coupled to a data hash or a request
* hash ... perhaps hashed with a serialized request
*/
protected function _makeId()
{
return JCache::makeId();
}
/**
* There is no change in page data so send an
* unmodified header and die gracefully
*
* @return void
*
* @since 11.1
*/
protected function _noChange()
{
$app = JFactory::getApplication();
// Send not modified header and exit gracefully
header('HTTP/1.x 304 Not Modified', true);
$app->close();
}
/**
* Set the ETag header in the response
*
* @param string $etag The entity tag (etag) to set
*
* @return void
*
* @since 11.1
*/
protected function _setEtag($etag)
{
JResponse::setHeader('ETag', $etag, true);
}
}