public async Task Save <T>(T aggregate, CommandMetadata metadata) where T : AggregateRoot
{
if (aggregate == null)
{
throw new ArgumentNullException(nameof(aggregate));
}
var streamName = GetStreamName(aggregate);
var changes = aggregate.GetChanges().ToArray();
await _store.AppendEvents(streamName, aggregate.Version, metadata, changes);
// Append snapshot
if (aggregate is AggregateRootSnapshot snapshotAggregate)
{
if ((snapshotAggregate.Version + changes.Length + 1) - snapshotAggregate.SnapshotVersion >= _snapshotThreshold)
{
await _store.AppendSnapshot(streamName, aggregate.Version + changes.Length, snapshotAggregate.GetSnapshot());
}
}
aggregate.ClearChanges();
}