public IndexAddressColumn(IRawFile kData, int capacity, long recordCountHint)
{
_fileID = kData.FileID;
_partitionID = kData.PartitionID;
int keycountHint = Math.Max(capacity, 1);
// Nuber of records per keyblock
// is a half of statistically expected
// but minimum size is 10
_rowBlockLenBitHint = (int)Math.Floor(Math.Log(Math.Max(recordCountHint / keycountHint / 2, 16), 2.0)) - 1;
_rowBlockLenBitHint = Math.Max(_rowBlockLenBitHint, 4);
int rowBlockLen = 1 << _rowBlockLenBitHint;
_kData = kData;
if (kData.GetAppendOffset() > 0)
{
rowBlockLen = _kData.ReadInt32(ROW_BLOK_LEN_ADDRESS_OFFSET);
_rowBlockLenBitHint = (int)Math.Log(rowBlockLen, 2);
if (1 << _rowBlockLenBitHint != rowBlockLen)
{
throw new NFSdbInvalidStateException("Row block length specified in file '{0}' equals " +
"{1}. Only power of 2 values are supported.",
_kData.Filename, rowBlockLen);
}
}
else if (kData.Access == EFileAccess.ReadWrite)
{
kData.WriteInt64(0, rowBlockLen); // 8
kData.WriteInt64(KEY_BLOCK_ADDRESS_OFFSET, INITIAL_KEYBLOCK_OFFSET); // 8
const int defaultKeyBlockSize = 0;
kData.WriteInt64(INITIAL_KEYBLOCK_OFFSET, defaultKeyBlockSize); // 8
kData.WriteInt64(INITIAL_KEYBLOCK_OFFSET + 8, 0); // 8
kData.SetAppendOffset(INITIAL_APPEND_OFFSET);
}
_rowBlockSize = rowBlockLen * 8 + 8;
}
public void Add(int key, long value, PartitionTxData tx)
{
var keyRecOffset = _indexAddress.ReadKeyRecordOffset(key, tx);
var blockOffset = _kData.ReadInt64(keyRecOffset);
long offset = keyRecOffset + 8;
var rowCount = _kData.ReadInt64(offset);
var cellIndex = (int)(rowCount & (_rowBlockLen - 1));
if (blockOffset == 0 || cellIndex == 0)
{
var prevRowBlockOffset = blockOffset;
blockOffset = tx.AppendOffset[_rFileID] + _rowBlockSize;
tx.AppendOffset[_rFileID] = blockOffset;
_rData.WriteInt64(blockOffset - 8, prevRowBlockOffset);
// Save block offset in k file
_kData.WriteInt64(keyRecOffset, blockOffset);
}
// Save value in index
_rData.WriteInt64(blockOffset - _rowBlockSize + 8 * cellIndex, value);
// Save row count in k file
_kData.WriteInt64(offset, rowCount + 1);
}
public void SetBytes(long rowID, byte[] value, PartitionTxData tx)
{
var offset = rowID * MetadataConstants.STRING_INDEX_FILE_RECORD_SIZE;
if (value != null)
{
var writeOffset = tx.AppendOffset[_data.FileID];
_index.WriteInt64(offset, writeOffset);
var size = value.Length;
WriteLength(writeOffset, size);
_data.WriteBytes(writeOffset + HEADER_SIZE, value, 0, size);
tx.AppendOffset[_data.FileID] = writeOffset + HEADER_SIZE + size;
}
else
{
_index.WriteInt64(offset, MetadataConstants.INDEX_NULL_DATA_VALUE);
}
}
public void SetInt64(long rowID, long value)
{
var offset = rowID * _sizeBytes;
_storage.WriteInt64(offset, value);
}
public void SaveKeyRecord(KeyRecord rowBlockDet, ITransactionContext tx)
{
_kData.WriteInt64(rowBlockDet.KeyOffset, rowBlockDet.BlockOffset);
_kData.WriteInt64(rowBlockDet.KeyOffset + 8, rowBlockDet.RowCount);
}