public void WriteCreateOrUpdateCommand(byte[] prefix, ByteBuffer key, ByteBuffer value, out uint valueFileId, out uint valueOfs, out int valueSize)
{
var command = KVCommandType.CreateOrUpdate;
if (_compression.ShouldTryToCompressKey(prefix.Length + key.Length))
{
if (prefix.Length != 0)
{
var fullkey = new byte[prefix.Length + key.Length];
Array.Copy(prefix, 0, fullkey, 0, prefix.Length);
Array.Copy(key.Buffer, key.Offset, fullkey, prefix.Length, key.Length);
prefix = BitArrayManipulation.EmptyByteArray;
key = ByteBuffer.NewAsync(fullkey);
}
if (_compression.CompressKey(ref key))
{
command |= KVCommandType.FirstParamCompressed;
}
}
valueSize = value.Length;
if (_compression.CompressValue(ref value))
{
command |= KVCommandType.SecondParamCompressed;
valueSize = -value.Length;
}
if (_writerWithTransactionLog.GetCurrentPosition() + prefix.Length + key.Length + 16 > MaxTrLogFileSize)
{
WriteStartOfNewTransactionLogFile();
}
_writerWithTransactionLog.WriteUInt8((byte)command);
_writerWithTransactionLog.WriteVInt32(prefix.Length + key.Length);
_writerWithTransactionLog.WriteVInt32(value.Length);
_writerWithTransactionLog.WriteBlock(prefix);
_writerWithTransactionLog.WriteBlock(key);
if (valueSize != 0)
{
if (valueSize > 0 && valueSize < MaxValueSizeInlineInMemory)
{
StoreValueInlineInMemory(value, out valueOfs, out valueSize);
valueFileId = 0;
}
else
{
valueFileId = _fileIdWithTransactionLog;
valueOfs = (uint)_writerWithTransactionLog.GetCurrentPosition();
}
_writerWithTransactionLog.WriteBlock(value);
}
else
{
valueFileId = 0;
valueOfs = 0;
}
}
internal void WriteHeader(AbstractBufferedWriter writer)
{
FileCollectionWithFileInfos.WriteHeader(writer, _guid);
writer.WriteUInt8((byte)KVFileType.TransactionLog);
writer.WriteVInt64(_generation);
writer.WriteVInt32((int)_previousFileId);
}
public void SetKeyPrefix(byte[] prefix, int prefixOfs, int prefixLen)
{
lock (_log)
{
_log.WriteUInt8((byte)KVReplayOperation.SetKeyPrefix);
_log.WriteVUInt32(TrIndex);
_log.WriteVInt32(prefixLen);
_log.WriteVInt32(prefixOfs);
_log.WriteBlock(prefix, prefixOfs, prefixLen);
_log.FlushBuffer();
}
_tr.SetKeyPrefix(prefix, prefixOfs, prefixLen);
}
