Caching except admin panel

Hello.
How can i exclude admin panel from cache?

function wp_cache_add($key, $data, $group = '', $expire = 0) {
	global $wp_object_cache;

	$pos = strpos($_SERVER['REQUEST_URI'], 'wp-admin');
	if ($pos === false){
	return $wp_object_cache->add($key, $data, $group, $expire);
	}
	else
		return false;
}

does not work