internal override void Visit(UploadVersionRequest req)
{
VersionList versionList = req.RemoteVerList as VersionList;
if (versionList == null)
{
if (!this.dict.TryGetValue(req.RecordKey, out versionList))
{
throw new TransactionException("The specified record does not exist.");
}
}
if (versionList.TryAdd(req.VersionEntry, out VersionEntry remoteEntry))
{
req.RemoteVerEntry = remoteEntry;
req.Result = true;
req.Finished = true;
return;
}
else
{
// The same version key has been added before or by a concurrent tx.
// The new version cannot be inserted.
req.RemoteVerEntry = req.VersionEntry;
req.Result = false;
req.Finished = true;
}
}
internal override void Visit(UploadVersionRequest req)
{
VersionEntry ve = this.GetVersionEntryByKey(req.TableId, req.RecordKey, req.VersionKey, req.LocalVerEntry);
if (ve == null)
{
this.CQLExecute(string.Format(PartitionedCassandraVersionTable.CQL_UPLOAD_VERSION_ENTRY,
req.TableId,
req.RecordKey.ToString(),
req.VersionEntry.VersionKey,
req.VersionEntry.BeginTimestamp,
req.VersionEntry.EndTimestamp,
BytesSerializer.ToHexString(BytesSerializer.Serialize(req.VersionEntry.Record)),
req.VersionEntry.TxId,
req.VersionEntry.MaxCommitTs));
req.RemoteVerEntry = req.VersionEntry;
req.Result = true;
}
else // write-write conflict
{
req.RemoteVerEntry = req.VersionEntry;
req.Result = false;
}
req.Finished = true;
}
internal override void Visit(UploadVersionRequest req)
{
// what is this line doing ???
req.RemoteVerEntry = req.VersionEntry;
byte[][] returnBytes = req.Result as byte[][];
req.Result = returnBytes.IsSuccess();
}
internal override void Visit(UploadVersionRequest req)
{
this.HashId = req.RecordKey as string;
byte[] keyBytes = BitConverter.GetBytes(req.VersionKey);
byte[] valueBytes = VersionEntry.Serialize(req.VersionEntry);
this.RedisReq = new RedisRequest(this.HashId, keyBytes, valueBytes, RedisRequestType.HSetNX)
{
ParentRequest = req
};
}
internal override void Visit(UploadVersionRequest req)
{
bool applied = this.CQLExecuteWithIfApplied(string.Format(CassandraVersionTable.CQL_UPLOAD_VERSION_ENTRY,
req.TableId,
req.RecordKey.ToString(),
req.VersionEntry.VersionKey,
req.VersionEntry.BeginTimestamp,
req.VersionEntry.EndTimestamp,
BytesSerializer.ToHexString(BytesSerializer.Serialize(req.VersionEntry.Record)),
req.VersionEntry.TxId,
req.VersionEntry.MaxCommitTs));
req.Result = applied ? 1L : 0L;
req.Finished = true;
}
internal override void Visit(UploadVersionRequest req)
{
string hashKey = GetHashKey(req);
byte[][] args =
{
Encoding.ASCII.GetBytes(hashKey),
BitConverter.GetBytes(req.VersionKey),
VersionEntry.Serialize(req.VersionEntry)
};
var redisRequest = CreateLuaRequest(
LuaScriptName.UPLOAD_NEW_VERSION, args);
redisRequest.ParentRequest = req;
}
internal override void Visit(UploadVersionRequest req)
{
Dictionary <long, VersionEntry> versionList = req.RemoteVerList as
Dictionary <long, VersionEntry>;
if (versionList == null)
{
if (!this.dict.TryGetValue(req.RecordKey, out versionList))
{
throw new TransactionException("The specified record does not exist.");
}
}
if (versionList.ContainsKey(req.VersionKey))
{
req.RemoteVerEntry = req.VersionEntry;
req.Result = false;
}
else
{
versionList.Add(req.VersionKey, req.VersionEntry);
// Take the dirty version entry to store the current largest version key
VersionEntry tailEntry = versionList[SingletonDictionaryVersionTable.TAIL_KEY];
tailEntry.BeginTimestamp = req.VersionKey;
VersionEntry oldVersion = null;
if (versionList.Count > VersionTable.VERSION_CAPACITY)
{
long headKey = tailEntry.EndTimestamp;
tailEntry.EndTimestamp = headKey + 1;
versionList.TryGetValue(headKey, out oldVersion);
versionList.Remove(headKey);
}
req.RemoteVerEntry = oldVersion == null ? new VersionEntry() : oldVersion;
req.Result = true;
}
req.Finished = true;
}
internal override void Visit(UploadVersionRequest req)
{
ConcurrentDictionary <long, VersionEntry> versionList = req.RemoteVerList as
ConcurrentDictionary <long, VersionEntry>;
if (versionList == null)
{
if (!this.dict.TryGetValue(req.RecordKey, out versionList))
{
throw new TransactionException("The specified record does not exist.");
}
}
if (versionList.TryAdd(req.VersionKey, req.VersionEntry))
{
req.VersionEntry.ResetLatchQueue();
// The new version has been inserted successfully. Re-directs the tail pointer to the new version.
VersionEntry tailEntry = null;
versionList.TryGetValue(SingletonDictionaryVersionTable.TAIL_KEY, out tailEntry);
long headKey = Interlocked.Read(ref tailEntry.EndTimestamp);
long tailKey = Interlocked.Read(ref tailEntry.BeginTimestamp);
if (req.VersionKey < headKey)
{
versionList.Remove(req.VersionKey);
UploadFail(req);
return;
}
// Here we use Interlocked to atomically update the tail entry, instead of ConcurrentDict.TryUpdate().
// This is because once created, the whole tail entry always stays and is never replaced.
// All concurrent tx's only access the tail pointer, i.e., the beginTimestamp field.
long oldVersion = Interlocked.Exchange(ref tailEntry.BeginTimestamp, req.VersionKey);
// Debug Assertion
// if (oldVersion != req.VersionKey - 1)
// {
// throw new Exception("inconsistent version key");
// }
VersionEntry oldVerEntry = null;
// EndTimestamp (headKey) being never set means we just insert
// the first valid version. So the headKey should be redirected.
if (headKey == VersionEntry.DEFAULT_END_TIMESTAMP)
{
Interlocked.Exchange(ref tailEntry.EndTimestamp, tailKey);
}
else if (versionList.Count > VersionTable.VERSION_CAPACITY)
{
Interlocked.Exchange(ref tailEntry.EndTimestamp, headKey + 1);
versionList.TryRemove(headKey, out oldVerEntry);
if (oldVerEntry != null)
{
this.recordPool.TryCache(oldVerEntry.Record);
oldVerEntry.Record = null;
}
}
// Debug Assertion
// long debugTailkey = Interlocked.Read(ref tailEntry.BeginTimestamp);
// if (debugTailkey != req.VersionKey)
// {
// throw new Exception("Someone kicks in :(");
// }
req.RemoteVerEntry = oldVerEntry == null ? new VersionEntry() : oldVerEntry;
req.Result = true;
req.Finished = true;
return;
}
else
{
// The same version key has been added before or by a concurrent tx.
// The new version cannot be inserted.
UploadFail(req);
}
}
static private void UploadFail(UploadVersionRequest req)
{
req.RemoteVerEntry = req.VersionEntry;
req.Result = false;
req.Finished = true;
}
internal virtual void Visit(UploadVersionRequest req)
{
}
