public async Task <IndexResult> AddAsync(string email, Guid userId)
{
while (true)
{
var maybeEvent = await ReadUserByEmailIndexedEventAsync(email);
if (maybeEvent.HasValue)
{
return(maybeEvent.ValueOrFailure().UserId == userId
? IndexResult.EmailAccepted
: IndexResult.EmailRejected);
}
try
{
var userByEmailAdded = new UserIndexedByEmail(userId);
var eventData = _eventSerializer.ToEventData(userByEmailAdded);
await _connection.AppendToStreamAsync(
StreamBy(email),
ExpectedVersion.EmptyStream,
eventData);
return(IndexResult.EmailAccepted);
}
catch (WrongExpectedVersionException)
{
}
}
}
public async Task <long> SaveEventsAsync <TEvent>(string streamName, long expectedStreamVersion, IEnumerable <TEvent> events)
{
var eventDatas = events.Select(e => _serializer.ToEventData(e));
var streamVersion = MapStreamVersionToEventStoreStreamVersion(expectedStreamVersion);
// TODO: Handle failure cases
var writeResult = await _connection.AppendToStreamAsync(streamName, streamVersion, eventDatas);
return(writeResult.NextExpectedVersion);
}