public async Task SaveAggregate(TAggregateRoot aggregate)
{
if (!aggregate.HasChanges())
{
return;
}
var streamId = GetStreamId(aggregate.AggregateId);
var changes = aggregate.GetChanges();
if (aggregate.AggregateIsNotPersisted())
{
await _eventStore.CreateStream(streamId, changes);
}
else
{
await _eventStore.AppendStream(streamId, changes, aggregate.AggregateVersion);
}
}
private IEventStream GetStream(Guid streamId, bool createIfNotExists)
{
IEventStream stream;
if (_streams.TryGetValue(streamId, out stream))
{
return(stream);
}
stream = _eventStore.OpenStream(streamId);
if (stream != null)
{
stream = _streams.GetOrAdd(streamId, stream);
return(stream);
}
if (createIfNotExists)
{
stream = _streams.GetOrAdd(streamId, id => _eventStore.CreateStream(id));
return(stream);
}
return(null);
}