Cache handler:

$e107cache = e107::getCache();

Retrieve cache:

if( $cacheData = $e107cache->retrieve('your_code')) 
{ 
return $cacheData; 
}

Save cache:

$cache_data = ''; 
$cache_data = $text; 
$e107cache->set('your_code', $cache_data); 
return $cache_data;

System cache:

e107::getCache()->set_sys(params);
e107::getCache()->retrieve_sys('params');
e107::getCache()->clear_sys();