internal static OperationData WriteRecord(
LogRecord record,
BinaryWriter bw,
bool isPhysicalWrite = true,
bool setRecordLength = true,
bool forceRecomputeOffsets = false)
{
// NOTE:- The binary writer is not where the real data is written
// It is only passed in to avoid each log record from creating its own writer
// The real data of the log record is returned in the operation data
// As a result, reset the position of the writer before starting to write
bw.BaseStream.Position = 0;
var operationData = new OperationData();
record.Write(bw, operationData, isPhysicalWrite, forceRecomputeOffsets);
uint recordLength = 0;
foreach (var data in operationData)
{
recordLength += (uint)data.Count;
}
if (setRecordLength)
{
record.RecordLength = recordLength;
}
var mm = bw.BaseStream as MemoryStream;
var startingPosition = bw.BaseStream.Position;
bw.Write(recordLength);
var arraySegment = new ArraySegment <byte>(
mm.GetBuffer(),
(int)startingPosition,
(int)mm.Position - (int)startingPosition);
// Append and prepend record length in a fixed encoding of sizeof(int) bytes
operationData.Add(arraySegment);
operationData.Insert(0, arraySegment);
return(operationData);
}
