/**
* Returns cache driver. Cached items will persist between connections and are
* available to all users. When debug is enabled a dummy cache driver is used
* that caches nothing.
*
* @return \GO\Base\Cache\CacheInterface
*/
public static function cache()
{
if (!isset(self::$_cache)) {
if (GO::config()->debug || !GO::isInstalled()) {
self::$_cache = new \GO\Base\Cache\None();
} else {
if (!isset(GO::session()->values['cacheDriver'])) {
$cachePref = array("\\GO\\Base\\Cache\\Apc", "\\GO\\Base\\Cache\\Disk");
foreach ($cachePref as $cacheDriver) {
$cache = new $cacheDriver();
if ($cache->supported()) {
GO::debug("Using {$cacheDriver} cache");
GO::session()->values['cacheDriver'] = $cacheDriver;
self::$_cache = $cache;
break;
}
}
} else {
$cacheDriver = GO::session()->values['cacheDriver'];
self::$_cache = new $cacheDriver();
}
}
}
return self::$_cache;
}
