public override async Task <ReadModelEnvelope <TReadModel> > GetAsync(string id, CancellationToken cancellationToken)
{
var readModelType = typeof(TReadModel);
var stream = id == "null"
? readModelType.Name.ToLowerInvariant()
: $"{readModelType.Name.ToLowerInvariant()}-{id}";
var(lastMessage, found) = await _client.DB().ReadLastMessageFromStream(stream);
if (!found)
{
Log.Verbose(() => $"Could not find any StreamsDb read model '{readModelType.PrettyPrint()}' with ID '{id}'");
return(ReadModelEnvelope <TReadModel> .Empty(id));
}
var json = Encoding.UTF8.GetString(lastMessage.Value);
var readModel = JsonConvert.DeserializeObject <TReadModel>(json);
var readModelVersion = lastMessage.Position;
Log.Verbose(() => $"Found StreamsDb read model '{readModelType.PrettyPrint()}' with ID '{id}' and version '{readModelVersion}'");
return(ReadModelEnvelope <TReadModel> .With(id, readModel, readModelVersion));
}
public async Task <AllCommittedEventsPage> LoadAllCommittedEvents(GlobalPosition globalPosition, int pageSize, CancellationToken cancellationToken)
{
var streamsDbMessages = new List <Message>();
IGlobalSlice currentSlice;
var from = globalPosition.IsStart
? StreamsDB.Driver.GlobalPosition.Begin
: StreamsDB.Driver.GlobalPosition.Begin.Parse(globalPosition.Value);
do
{
currentSlice = await _client.DB().ReadGlobalForward(from, pageSize).ConfigureAwait(false);
from = currentSlice.Next;
streamsDbMessages.AddRange(currentSlice.Messages);
}while (streamsDbMessages.Count < pageSize && currentSlice.HasNext);
var eventFlowEvents = Map(streamsDbMessages);
return(new AllCommittedEventsPage(new GlobalPosition(currentSlice.Next.ToString()), eventFlowEvents));
}
private async Task InitializeCursors()
{
var(message, found) = await _client.DB().ReadLastMessageFromStream(_cursorsStream);
_cursor = found ? JsonConvert.DeserializeObject <long>(Encoding.UTF8.GetString(message.Value)) : 0;
}
