public async Task AppendEventsAsync(IReadOnlyCollection <IEvent> events)
{
if (events == null)
{
throw new ArgumentNullException(nameof(events));
}
// persist events in Event Store
await _store.Streams[_streamName].AppendManyAsync(events);
// forward events to indices so they can update their state
foreach (var ev in events)
{
_cache.ApplyEvent(ev);
}
}