void SerializeIntoBuffer(object metadata, IReadOnlyList <object> events, out int startOffset, out IDescriptorSerializerContext serializerContext, out BlockType blockType, out int lenWithoutEndPadding, out ByteBuffer block) { startOffset = (int)EndBufferLen + HeaderSize; var writer = new ByteBufferWriter(); writer.WriteBlock(_zeroes.AsSpan(0, startOffset)); serializerContext = Mapping; if (metadata != null) { serializerContext = serializerContext.StoreNewDescriptors(writer, metadata); } if (events != null) { foreach (var o in events) { serializerContext = serializerContext.StoreNewDescriptors(writer, o); } if (events.Count == 0) { events = null; } } serializerContext.FinishNewDescriptors(writer); blockType = BlockType.FirstBlock; if (serializerContext.SomeTypeStored) { blockType |= BlockType.HasTypeDeclaration; } if (metadata != null) { serializerContext.StoreObject(writer, metadata); blockType |= BlockType.HasMetadata; } if (events != null) { if (events.Count == 1) { serializerContext.StoreObject(writer, events[0]); blockType |= BlockType.HasOneEvent; } else { writer.WriteVUInt32((uint)events.Count); foreach (var o in events) { serializerContext.StoreObject(writer, o); } blockType |= BlockType.HasMoreEvents; } } lenWithoutEndPadding = (int)writer.GetCurrentPosition(); writer.WriteBlock(_zeroes.AsSpan(0, (int)(SectorSize - 1))); block = writer.Data; if (CompressionStrategy.ShouldTryToCompress(lenWithoutEndPadding - startOffset)) { var compressedBlock = ByteBuffer.NewSync(block.Buffer, startOffset, lenWithoutEndPadding - startOffset); if (CompressionStrategy.Compress(ref compressedBlock)) { blockType |= BlockType.Compressed; Array.Copy(compressedBlock.Buffer, compressedBlock.Offset, block.Buffer, startOffset, compressedBlock.Length); lenWithoutEndPadding = startOffset + compressedBlock.Length; Array.Copy(_zeroes, 0, block.Buffer, lenWithoutEndPadding, (int)SectorSize - 1); } } }