public Task ClearStateAsync(string grainType, Orleans.GrainReference grainReference, Orleans.GrainState grainState)
{
if (!(grainState is IAggregateState))
throw new NotAggregateStateException(grainState.GetType());
var state = grainState as IAggregateState;
var stream = this.GetStreamName(grainType, grainReference);
return this.Connection.DeleteStreamAsync(stream, state.Version);
}
public async Task WriteStateAsync(string grainType, GrainReference grainReference, Orleans.IGrainState grainState)
{
if (!(grainState is IAggregateState))
throw new NotAggregateStateException(grainState.GetType());
var state = grainState as IAggregateState;
var stream = this.GetStreamName(grainType, grainReference);
var newEvents = state.UncommitedEvents;
if (newEvents.Count == 0)
return;
var originalVersion = state.Version - newEvents.Count - 1;
var expectedVersion = originalVersion == -1 ? ExpectedVersion.NoStream : originalVersion;
var eventsToSave = newEvents.Select(e => ToEventData(e)).ToList();
if (eventsToSave.Count < WritePageSize)
{
await this.Connection.AppendToStreamAsync(stream, expectedVersion, eventsToSave.ToArray());
}
else
{
var transaction = await this.Connection.StartTransactionAsync(stream, expectedVersion);
var position = 0;
while (position < eventsToSave.Count)
{
var pageEvents = eventsToSave.Skip(position).Take(WritePageSize);
await transaction.WriteAsync(pageEvents);
position += WritePageSize;
}
await transaction.CommitAsync();
}
state.UncommitedEvents.Clear();
}
