public bool TryGetName(StreamId streamId, out string name)
{
if (streamId % 2 == 1)
{
throw new ArgumentOutOfRangeException(nameof(streamId), "streamId must be even");
}
// we divided by two when calculating the position in the stream, since we dont
// explicitly create metastreams.
var record = _indexReader.ReadPrepare(
streamId: LogV3SystemStreams.StreamsCreatedStreamNumber,
eventNumber: StreamIdConverter.ToEventNumber(streamId));
if (record is null)
{
name = null;
return(false);
}
if (record is not LogV3StreamRecord streamRecord)
{
throw new Exception($"Unexpected log record type: {record}.");
}
name = streamRecord.StreamName;
return(true);
}
public bool TryGetLastValue(out StreamId lastValue)
{
var lastEventNumber = _indexReader.GetStreamLastEventNumber(LogV3SystemStreams.StreamsCreatedStreamNumber);
var success = ExpectedVersion.NoStream < lastEventNumber && lastEventNumber != EventNumber.DeletedStream;
lastValue = StreamIdConverter.ToStreamId(lastEventNumber);
return(success);
}