public async Task SaveAsync(Aggregate aggregate, Action <IDictionary <string, object> > updateHeaders = null)
{
var headers = new Dictionary <string, object>();
updateHeaders?.Invoke(headers);
var streamName = getStreamName(aggregate.GetType(), aggregate.Id);
var newEvents = aggregate.Changes.ToList();
var originalVersion = aggregate.State.Version - newEvents.Count;
var expectedVersion = originalVersion == InitialVersion
? ExpectedVersion.NoStream
: originalVersion.Subtract(1);
var events = newEvents.Select(@event => (EventData)ToEventData(@event, headers));
var eventToSave = events as IList <EventData> ?? events.ToList();
if (eventToSave.Count < WritePageSize)
{
try
{
await connection.AppendToStreamAsync(streamName, expectedVersion, eventToSave);
}
catch (Exception exception)
{
log.Error(exception);
}
}
else
{
try
{
using (var transaction = await connection.StartTransactionAsync(streamName, expectedVersion))
{
var position = 0;
while (position < eventToSave.Count)
{
var pageEvents = eventToSave.Skip(position).Take(WritePageSize);
try
{
await transaction.WriteAsync(pageEvents);
}
catch (Exception e) when(e.Message.Contains("WrongExpectedVersion"))
{
log.Error(e);
// todo: throw appropriate exception e.g. AggregateVersionException
}
catch (Exception e)
{
log.Error(e);
}
position += WritePageSize;
}
await transaction.CommitAsync();
}
}
catch (Exception e)
{
log.Error(e);
}
}
aggregate.ClearCommittedEvents();
}