protected override Task <long> ReadHeadPositionInternal(CancellationToken cancellationToken)
{
var message = _allStream.LastOrDefault();
return(message == null?Task.FromResult(-1L) : Task.FromResult(message.Position));
}
protected override Task <long> ReadHeadCheckpointInternal(CancellationToken cancellationToken)
{
var streamEvent = _allStream.LastOrDefault();
return(streamEvent == null?Task.FromResult(-1L) : Task.FromResult(streamEvent.Checkpoint));
}