/**
* Get the layout's XML structure
*
* This is cached because it's expensive to load for each ESI'd block
*
* @return Mage_Core_Model_Layout_Element|SimpleXMLElement
*/
public function getLayoutXml()
{
Varien_Profiler::start('turpentine::helper::esi::getLayoutXml');
if (is_null($this->_layoutXml)) {
if ($useCache = Mage::app()->useCache('layout')) {
$cacheKey = $this->getFileLayoutUpdatesXmlCacheKey();
$this->_layoutXml = simplexml_load_string(Mage::app()->loadCache($cacheKey));
}
// this check is redundant if the layout cache is disabled
if (!$this->_layoutXml) {
$this->_layoutXml = $this->_loadLayoutXml();
if ($useCache) {
Mage::app()->saveCache($this->_layoutXml->asXML(), $cacheKey, array('LAYOUT_GENERAL_CACHE_TAG'));
}
}
}
Varien_Profiler::stop('turpentine::helper::esi::getLayoutXml');
return $this->_layoutXml;
}
