public PartitionTxData ReadTxLogFromPartition(ReadContext readCache, TxRec txRec = null)
{
if (txRec == null)
{
return(ReadTxLogFromFile(readCache));
}
return(ReadTxLogFromFileAndTxRec(readCache, txRec));
}
public PartitionTxData ReadTxLogFromPartition(ReadContext readCache, TxRec txRec = null)
{
if (!_isStorageInitialized)
{
InitializeStorage();
}
return(_txSupport.ReadTxLogFromPartition(readCache, txRec));
}
public TT Read <TT>(long rowID, ReadContext readContext)
{
if (!_isStorageInitialized)
{
InitializeStorage();
}
return((TT)_fieldSerializer.Read(rowID, readContext));
}
public PartitionTxData ReadTxLogFromFile(ReadContext readCache)
{
long nextRowID = -1L;
string lastRowIDFilename = null;
var pd = new PartitionTxData(_metadata.FileCount, _partitionID, _startDate, _endTime, readCache);
for (int i = 0; i < _storage.OpenFileCount; i++)
{
var file = _storage.GetOpenedFileByID(i);
if (file == null)
{
continue;
}
IColumnMetadata column;
long fileAppendOffset;
try
{
fileAppendOffset = file.GetAppendOffset();
pd.AppendOffset[file.FileID] = fileAppendOffset;
if (file.DataType == EDataType.Symrk || file.DataType == EDataType.Datak)
{
var keyBlockOffset = file.ReadInt64(MetadataConstants.K_FILE_KEY_BLOCK_OFFSET);
pd.SymbolData[file.FileID].KeyBlockOffset = keyBlockOffset;
var keyBlockSize = file.ReadInt64(keyBlockOffset);
pd.SymbolData[file.FileID].KeyBlockSize = (int)keyBlockSize;
}
column = _metadata.GetColumnByID(file.ColumnID);
if (_metadata.TimestampColumnID == column.ColumnID)
{
var timestamp = file.ReadInt64(fileAppendOffset - TIMESTAMP_DATA_SIZE);
pd.LastTimestamp = timestamp;
}
}
catch (Exception ex)
{
if (ex is NFSdbPartitionException)
{
throw;
}
throw new NFSdbTransactionStateExcepton(
string.Format("Error reading transaction state from file {0}",
file.Filename), ex);
}
var size = StorageSizeUtils.GetRecordSize(column, file.DataType);
if (size > 0)
{
long rowId = fileAppendOffset / size;
if (nextRowID >= 0 && rowId != nextRowID)
{
throw new NFSdbTransactionStateExcepton(
string.Format("File {0} has last rowID" +
" different than file {1}. Journal is not consistent" +
" or mutiple writes happened",
file.Filename, lastRowIDFilename));
}
nextRowID = rowId;
lastRowIDFilename = file.Filename;
}
}
pd.NextRowID = nextRowID;
return(pd);
}
private PartitionTxData ReadTxLogFromFileAndTxRec(ReadContext readCache, TxRec txRec)
{
int symrRead = 0;
var pd = new PartitionTxData(_metadata.FileCount, _partitionID, _startDate, _endTime, readCache);
long nextRowID = RowIDUtil.ToLocalRowID(txRec.JournalMaxRowID - 1) + 1;
pd.NextRowID = nextRowID;
for (int i = 0; i < _storage.OpenFileCount; i++)
{
var file = _storage.GetOpenedFileByID(i);
if (file == null)
{
continue;
}
try
{
if (file.DataType == EDataType.Symrk &&
txRec.SymbolTableIndexPointers != null)
{
var blockOffset = txRec.SymbolTableIndexPointers[symrRead++];
pd.SymbolData[file.FileID].KeyBlockOffset = blockOffset;
long keyBlockSize = file.ReadInt64(blockOffset
+ MetadataConstants.K_FILE_ROW_BLOCK_LEN_OFFSET);
pd.SymbolData[file.FileID].KeyBlockSize = (int)keyBlockSize;
pd.AppendOffset[file.FileID] = blockOffset + keyBlockSize;
}
else if (file.DataType == EDataType.Datak &&
txRec.IndexPointers != null)
{
var blockOffset = txRec.IndexPointers[file.ColumnID];
pd.SymbolData[file.FileID].KeyBlockOffset = blockOffset;
long keyBlockSize = file.ReadInt64(blockOffset
+ MetadataConstants.K_FILE_ROW_BLOCK_LEN_OFFSET);
pd.SymbolData[file.FileID].KeyBlockSize = (int)keyBlockSize;
pd.AppendOffset[file.FileID] = blockOffset + keyBlockSize;
}
else
{
var column = _metadata.GetColumnByID(file.ColumnID);
var size = StorageSizeUtils.GetRecordSize(column, file.DataType);
if (size > 0)
{
// Fixed column.
pd.AppendOffset[file.FileID] = nextRowID * size;
}
else
{
// Variable column.
pd.AppendOffset[file.FileID] = file.GetAppendOffset();
}
if (_metadata.TimestampColumnID == column.ColumnID)
{
var timestamp = file.ReadInt64(pd.AppendOffset[file.FileID] - TIMESTAMP_DATA_SIZE);
pd.LastTimestamp = timestamp;
}
}
}
catch (Exception ex)
{
if (ex is NFSdbPartitionException)
{
throw;
}
throw new NFSdbTransactionStateExcepton(
string.Format("Error reading transaction state from file {0}",
file.Filename), ex);
}
}
pd.NextRowID = nextRowID;
return(pd);
}
