/// <summary>
/// Rolls back transaction by copying all backed up data bask to master stream and closes the transaction.
/// </summary>
public void RollbackTransaction()
{
if (logStreamHeader != null)
{
if (logStreamHeader.TransactionCompleted)
{
throw new InvalidOperationException("Can't rollback completed transaction");
}
logStream.Position = TransactionLogStreamMetadata.StructureSize;
// Copy segments from log stream back to stream
for (int i = 0; i < logStreamHeader.SegmentCount; i++)
{
SegmentMetadata sh = SegmentMetadata.Load(logStream);
if (!sh.TransactionId.Equals(logStreamHeader.TransactionId))
{
throw new InvalidOperationException("Wrong segment found in transaction log");
}
masterStream.Position = sh.Position;
CopyData(logStream, sh.Size, masterStream);
}
// Set back original stream length
if (logStreamHeader.StreamLength < masterStream.Length)
{
masterStream.SetLength(logStreamHeader.StreamLength);
}
masterStream.Flush();
logStream.SetLength(0);
logStream.Flush();
logStreamHeader = null;
rollbackNeeded = false;
}
}
