private void DoRollback()
{
var enumerator = new LogRecordEnumerator(_logManager, _bufferManager);
do
{
var record = enumerator.Current;
if (record.TransactionNumber == _transactionNumber)
{
if (record.Type == LogRecordType.Start)
{
return;
}
record.Undo();
}
} while (enumerator.MoveNext());
}
private void DoRecover()
{
var commitedTransactions = new HashSet <int>();
var enumerator = new LogRecordEnumerator(_logManager, _bufferManager);
do
{
var record = enumerator.Current;
if (record.Type == LogRecordType.Checkpoint)
{
return;
}
if (record.Type == LogRecordType.Commit)
{
commitedTransactions.Add(record.TransactionNumber);
}
else if (!commitedTransactions.Contains(record.TransactionNumber))
{
record.Undo();
}
} while (enumerator.MoveNext());
}