public void CanWriteMultipleRollbackRecordsToLog()
{
_logRecord = new RollbackRecord(_logManager, _bufferManager, 1);
var lsn = _logRecord.WriteToLog();
var lsn2 = new RollbackRecord(_logManager, _bufferManager, 2).WriteToLog();
_logManager.Flush(lsn2);
var page = _fileManager.ResolvePage();
_ = page.Read(new Block(_logFileName, 0));
_ = page.GetInt(0, out var nextResPosition);
_ = page.GetInt(sizeof(int), out var recordType1);
_ = page.GetInt(sizeof(int) * 2, out var transactionId1);
_ = page.GetInt(12 + 0, out var recordLength2);
_ = page.GetInt(12 + sizeof(int), out var recordType2);
_ = page.GetInt(12 + sizeof(int) * 2, out var transactionId2);
Assert.AreEqual(0, lsn);
Assert.AreEqual(1, lsn2);
Assert.AreEqual((sizeof(int) + sizeof(LogRecordType) + sizeof(int)) * 2, nextResPosition);
Assert.AreEqual((int)LogRecordType.Rollback, recordType1);
Assert.AreEqual(1, transactionId1);
Assert.AreEqual(0, recordLength2);
Assert.AreEqual((int)LogRecordType.Rollback, recordType2);
Assert.AreEqual(2, transactionId2);
}
public void Rollback()
{
_bufferManager.FlushAll(_transactionNumber);
DoRollback();
int lsn = new RollbackRecord(_logManager, _bufferManager, _transactionNumber)
.WriteToLog();
_logManager.Flush(lsn);
}
public void CanReadRollbackRecord()
{
var rec = new RollbackRecord(_logManager, _bufferManager, 5);
var lsn = rec.WriteToLog();
_logManager.Flush(lsn);
_enumerator = new LogRecordEnumerator(_logManager, _bufferManager);
var record = _enumerator.Current as RollbackRecord;
Assert.AreEqual(LogRecordType.Rollback, record.Type);
Assert.AreEqual(5, record.TransactionNumber);
}
public void CanReadBackwardsFromLog()
{
_logRecord = new RollbackRecord(_logManager, _bufferManager, 1);
var lsn = _logRecord.WriteToLog();
_logManager.Flush(lsn);
var enumerator = _logManager.GetEnumerator();
var basicLogRecord = enumerator.Current;
var logRecord = new RollbackRecord(_logManager, _bufferManager, basicLogRecord);
Assert.AreEqual(LogRecordType.Rollback, logRecord.Type);
Assert.AreEqual(1, logRecord.TransactionNumber);
}
public void CanRollback()
{
_recoveryManager = new RecoveryManager(_bufferManager, _logManager, 6);
var block = new Block(RandomFilename, 0);
var buffer = _bufferManager.Pin(block);
_recoveryManager.Rollback();
_bufferManager.Unpin(buffer);
_bufferManager.FlushAll(6);
var page = _fileManager.ResolvePage();
_ = page.Read(new Block(_name, 0));
var enumerator = _logManager.GetEnumerator();
var record = enumerator.Current;
var commitRecord = new RollbackRecord(_logManager, _bufferManager, record);
Assert.AreEqual(LogRecordType.Rollback, commitRecord.Type);
Assert.AreEqual(6, commitRecord.TransactionNumber);
}