private async Task <(TModel, ulong?)> ReadModelStateAsync(object id, TemporalOrder?temporalOrder, DateTime?temporalDateFrom, ulong?temporalNumberFrom)
{
if (temporalOrder != TemporalOrder.Newest && !temporalDateFrom.HasValue && !temporalNumberFrom.HasValue)
{
return(null, null);
}
var streamName = EventStoreCommon.GetStateStreamName <TModel>(id);
TModel model = null;
ulong? modelEventNumber = null;
long?count = null;
if (temporalOrder == TemporalOrder.Newest)
{
count = 1;
}
if (temporalOrder == TemporalOrder.Newest || temporalDateFrom.HasValue || temporalNumberFrom.HasValue)
{
var eventData = (await Engine.ReadBackwardsAsync(streamName, null, count, temporalNumberFrom, null, temporalDateFrom)).LastOrDefault();
if (eventData != null)
{
var eventState = EventStoreCommon.Deserialize <EvenStoreStateData <TModel> >(eventData.Data.Span);
modelEventNumber = eventState.Number;
model = eventState.Model;
}
}
return(model, modelEventNumber);
}
private void SaveModelState(object id, TModel model, ulong eventNumber)
{
var streamName = EventStoreCommon.GetStateStreamName <TModel>(id);
var eventState = new EvenStoreStateData <TModel>()
{
Model = model,
Number = eventNumber,
Deleted = model == null
};
var data = EventStoreCommon.Serialize(eventState);
Engine.Append(Guid.NewGuid(), "StoreState", streamName, null, EventStoreState.Any, data);
}