internal override void Visit(UpdateVersionMaxCommitTsRequest req)
{
VersionEntry verEntry = req.RemoteVerEntry;
if (verEntry == null)
{
ConcurrentDictionary <long, VersionEntry> versionList = null;
if (!this.dict.TryGetValue(req.RecordKey, out versionList))
{
throw new TransactionException("The specified record does not exist.");
}
if (!versionList.TryGetValue(req.VersionKey, out verEntry))
{
throw new TransactionException("The specified version does not exist.");
}
}
Debug.Assert(verEntry.VersionKey == req.VersionKey);
//int ticket = verEntry.EnterQueuedLatch();
verEntry.WriteLock();
Interlocked.Exchange(
ref verEntry.MaxCommitTs,
Math.Max(req.MaxCommitTs, Interlocked.Read(ref verEntry.MaxCommitTs)));
VersionEntry.CopyFromRemote(verEntry, req.LocalVerEntry);
//verEntry.ExitQueuedLatch(ticket);
verEntry.UnWriteLock();
req.Result = req.LocalVerEntry;
req.Finished = true;
}
internal override void Visit(ReplaceVersionRequest req)
{
VersionEntry entry = req.RemoteVerEntry;
if (entry == null)
{
ConcurrentDictionary <long, VersionEntry> versionList = null;
if (!this.dict.TryGetValue(req.RecordKey, out versionList))
{
throw new TransactionException("The specified record does not exist.");
}
if (!versionList.TryGetValue(req.VersionKey, out entry))
{
throw new TransactionException("The specified version does not exist.");
}
}
Debug.Assert(entry.VersionKey == req.VersionKey);
// Debug Assertion
// if (!entry.RecordKey.Equals(req.RecordKey))
// {
// throw new Exception("Inconsistent record key");
// }
//int ticket = entry.EnterQueuedLatch();
entry.WriteLock();
if (Interlocked.Read(ref entry.TxId) == req.SenderId &&
Interlocked.Read(ref entry.EndTimestamp) == req.ExpectedEndTs)
{
Interlocked.Exchange(ref entry.BeginTimestamp, req.BeginTs);
Interlocked.Exchange(ref entry.EndTimestamp, req.EndTs);
Interlocked.Exchange(ref entry.TxId, req.TxId);
VersionEntry.CopyFromRemote(entry, req.LocalVerEntry);
// req.LocalVerEntry.RecordKey = req.RecordKey;
}
//entry.ExitQueuedLatch(ticket);
entry.UnWriteLock();
req.Result = req.LocalVerEntry;
req.Finished = true;
}
