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<?php
/**
* @package Joomla.Platform
* @subpackage Cache
*
* @copyright Copyright (C) 2005 - 2012 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 view type object
*
* @package Joomla.Platform
* @subpackage Cache
* @since 11.1
*/
class JCacheControllerView extends JCacheController
{
/**
* Get the cached view data
*
* @param object &$view The view object to cache output for
* @param string $method The method name of the view method to cache output for
* @param string $id The cache data id
* @param boolean $wrkarounds True to enable workarounds.
*
* @return boolean True if the cache is hit (false else)
*
* @since 11.1
*/
public function get(&$view, $method, $id = false, $wrkarounds = true)
{
// If an id is not given generate it from the request
if ($id == false)
{
$id = $this->_makeId($view, $method);
}
$data = false;
$data = $this->cache->get($id);
$locktest = new stdClass;
$locktest->locked = null;
$locktest->locklooped = null;
if ($data === false)
{
$locktest = $this->cache->lock($id, null);
// If the loop is completed and returned true it means the lock has been set
// If looped is true try to get the cached data again; it could exist now
if ($locktest->locked == true && $locktest->locklooped == true)
{
$data = $this->cache->get($id);
}
// False means that locking is either turned off or maxtime has been exceeded.
// Execute the view.
}
if ($data !== false)
{
$data = unserialize(trim($data));
if ($wrkarounds === true)
{
echo JCache::getWorkarounds($data);
}
else
{
// No workarounds, so all data is stored in one piece
echo (isset($data)) ? $data : null;
}
if ($locktest->locked == true)
{
$this->cache->unlock($id);
}
return true;
}
/*
* No hit so we have to execute the view
*/
if (method_exists($view, $method))
{
// If previous lock failed try again
if ($locktest->locked == false)
{
$locktest = $this->cache->lock($id);
}
// Capture and echo output
ob_start();
ob_implicit_flush(false);
$view->$method();
$data = ob_get_contents();
ob_end_clean();
echo $data;
/*
* For a view we have a special case. We need to cache not only the output from the view, but the state
* of the document head after the view has been rendered. This will allow us to properly cache any attached
* scripts or stylesheets or links or any other modifications that the view has made to the document object
*/
$cached = array();
$cached = $wrkarounds == true ? JCache::setWorkarounds($data) : $data;
// Store the cache data
$this->cache->store(serialize($cached), $id);
if ($locktest->locked == true)
{
$this->cache->unlock($id);
}
}
return false;
}
/**
* Generate a view cache id.
*
* @param object &$view The view object to cache output for
* @param string $method The method name to cache for the view object
*
* @return string MD5 Hash : view cache id
*
* @since 11.1
*/
protected function _makeId(&$view, $method)
{
return md5(serialize(array(JCache::makeId(), get_class($view), $method)));
}
}