addItemsToCache method
Implementation
void addItemsToCache({List<NsgDataItem?>? items, String? tag = ''}) {
if (items == null || items.isEmpty) return;
var time = DateTime.now();
var cache = _getItemsCacheByType(items[0].runtimeType);
for (var item in items) {
cache!.add(item: item!, time: time, tag: tag);
}
}