private protected async ValueTask ConsumeAsync()
{
await reader.ReadBlockAsync(metadataBuffer.AsMemory()).ConfigureAwait(false);
metadata = new LogEntryMetadata(metadataBuffer);
consumed = false;
}
// fast path - attempt to consume metadata synchronously
private bool TryConsume()
{
if (!reader.TryReadBlock(LogEntryMetadata.Size, out var result) || result.IsCanceled)
{
return(false);
}
metadata = new(result.Buffer, out var metadataEnd);
reader.AdvanceTo(metadataEnd);
consumed = false;
return(true);
}
// slow path - consume metadata asynchronously and allocate buffer on the heap
private async ValueTask ConsumeSlowAsync()
{
if (metadataBuffer.IsEmpty)
{
metadataBuffer = new(new byte[LogEntryMetadata.Size]);
}
await reader.ReadBlockAsync(metadataBuffer).ConfigureAwait(false);
metadata = new(metadataBuffer);
consumed = false;
}
internal static SnapshotMetadata Create <TLogEntry>(TLogEntry snapshot, long index, long length)
where TLogEntry : IRaftLogEntry
=> new SnapshotMetadata(LogEntryMetadata.Create(snapshot, Size, length), index);
private SnapshotMetadata(LogEntryMetadata metadata, long index)
{
Index = index;
RecordMetadata = metadata;
}
