public static View InitFromConfigVer2(string name, ReplicatedTableConfigurationStore configurationStore, Action <ReplicaInfo> SetConnectionString)
{
View view = new View(name);
if (configurationStore != null)
{
view.ViewId = configurationStore.ViewId;
foreach (ReplicaInfo replica in configurationStore.GetCurrentReplicaChain())
{
SetConnectionString(replica);
CloudTableClient tableClient = ReplicatedTableConfigurationManager.GetTableClientForReplica(replica);
if (tableClient == null)
{
// All replicas MUST exist or View is not relevant
view.Chain.Clear();
ReplicatedTableLogger.LogError("ViewName={0} could not load replica ({1})", name, replica);
break;
}
view.Chain.Add(new Tuple <ReplicaInfo, CloudTableClient>(replica, tableClient));
}
// Infered: first readable replica
view.ReadHeadIndex = view.Chain.FindIndex(tuple => tuple.Item1.IsReadable());
}
return(view);
}
private void ThrowIfAnyPartitionViewHasManyReplicasInConversionMode(ReplicatedTableConfiguredTable config)
{
if (config.ConvertToRTable == false || config.PartitionsToViewMap == null)
{
return;
}
/*
* Key = "" - View = "" => Ignore
* Key = "" - View = "viewName" => Ignore
* Key = "X" - View = "" => Should never happen (already tken care by the flow)
* Key = "Y" - View = "viewName" => 'viewName' can't have more than 1 replica
*/
foreach (var entry in config.PartitionsToViewMap.Where(e => !string.IsNullOrEmpty(e.Key)))
{
string viewName = entry.Value;
ReplicatedTableConfigurationStore viewConfig = GetView(viewName);
// Assert (viewConfig != null)
// In Conversion mode, view should not have more than 1 replica
List <ReplicaInfo> chainList = viewConfig.GetCurrentReplicaChain();
if (chainList.Count <= 1)
{
continue;
}
var msg = string.Format("Table:\'{0}\' refers a partition view:\'{1}\' with more than 1 replica while in Conversion mode!",
config.TableName,
viewName);
throw new Exception(msg);
}
}
private void ThrowIfViewBreaksTableConstraint(string viewName, ReplicatedTableConfigurationStore config)
{
foreach (ReplicatedTableConfiguredTable table in tableList)
{
if (table.ConvertToRTable == false || !table.IsViewReferenced(viewName))
{
continue;
}
// Conversion mode: view shoud not have more than 1 replica
List <ReplicaInfo> chainList = config.GetCurrentReplicaChain();
if (chainList.Count <= 1)
{
continue;
}
var msg = string.Format("Table:\'{0}\' should not have a view:\'{1}\' with more than 1 replica since it is in Conversion mode!",
table.TableName,
viewName);
throw new Exception(msg);
}
}
public static View InitFromConfigVer2(string name, ReplicatedTableConfigurationStore configurationStore, Action <ReplicaInfo> SetConnectionString)
{
View view = new View(name);
if (configurationStore != null)
{
view.ViewId = configurationStore.ViewId;
view.RefreshTime = DateTime.UtcNow;
foreach (ReplicaInfo replica in configurationStore.GetCurrentReplicaChain())
{
SetConnectionString(replica);
CloudTableClient tableClient = ReplicatedTableConfigurationManager.GetTableClientForReplica(replica);
if (tableClient == null)
{
// All replicas MUST exist or View is not relevant
view.Chain.Clear();
ReplicatedTableLogger.LogError("ViewName={0} could not load replica ({1})", name, replica);
break;
}
view.Chain.Add(new Tuple <ReplicaInfo, CloudTableClient>(replica, tableClient));
}
// Infered: first readable replica
view.ReadHeadIndex = view.Chain.FindIndex(tuple => tuple.Item1.IsReadable());
// If not configured use Tail. Chain must be defined at this point, so don't move this code up!
view.ReadTailIndex = configurationStore.ReadViewTailIndex;
if (view.ReadTailIndex < 0)
{
view.ReadTailIndex = view.TailIndex;
}
}
return(view);
}
private void ThrowIfViewHasManyReplicasInConvertionMode(ReplicatedTableConfiguredTable config)
{
if (config.ConvertToRTable == false || string.IsNullOrEmpty(config.ViewName))
{
return;
}
ReplicatedTableConfigurationStore viewConfig = GetView(config.ViewName);
// Assert (viewConfig != null)
// In Convertion mode, view should not have more than 1 replica
List <ReplicaInfo> chainList = viewConfig.GetCurrentReplicaChain();
if (chainList.Count <= 1)
{
return;
}
var msg = string.Format("Table:\'{0}\' refers a view:\'{1}\' with more than 1 replica while in Convertion mode!",
config.TableName,
config.ViewName);
throw new Exception(msg);
}
private void ThrowIfViewIsNotValid(string viewName, ReplicatedTableConfigurationStore config)
{
if (config.ReplicaChain == null || config.ReplicaChain.Any(replica => replica == null))
{
var msg = string.Format("View:\'{0}\' has a null replica(s) !!!", viewName);
throw new Exception(msg);
}
List <ReplicaInfo> chainList = config.GetCurrentReplicaChain();
if (chainList.Any())
{
/* RULE 1:
* =======
* Read replicas rule:
* - [R] replicas are contiguous from Tail backwards
* - [R] replica count >= 1
*/
string readPattern = "^W*R+$";
/* RULE 2:
* =======
* Write replicas rule:
* - [W] replicas are contiguous from Head onwards
* - [W] replica count = 0 or = ChainLength
*/
string writePattern = "^((R+)|(W+))$";
// Get replica sequences
string readSeq = "";
string writeSeq = "";
foreach (var replica in chainList)
{
// Read sequence:
if (replica.IsReadable())
{
readSeq += "R";
}
else
{
readSeq += "W";
}
// Write sequence:
if (replica.IsWritable())
{
writeSeq += "W";
}
else
{
writeSeq += "R";
}
}
// Verify RULE 1:
if (!Regex.IsMatch(readSeq, readPattern))
{
var msg = string.Format("View:\'{0}\' has invalid Read chain:\'{1}\' !!!", viewName, readSeq);
throw new Exception(msg);
}
// Verify RULE 2:
if (!Regex.IsMatch(writeSeq, writePattern))
{
var msg = string.Format("View:\'{0}\' has invalid Write chain:\'{1}\' !!!", viewName, writeSeq);
throw new Exception(msg);
}
}
}
private static void MoveReplicaToFrontAndSetViewToReadOnly(string viewName, ReplicatedTableConfigurationStore conf, string storageAccountName)
{
List<ReplicaInfo> list = conf.ReplicaChain;
int matchIndex = list.FindIndex(r => r.StorageAccountName == storageAccountName);
if (matchIndex == -1)
{
return;
}
// - Ensure its status is *None*
ReplicaInfo candidateReplica = list[matchIndex];
candidateReplica.Status = ReplicaStatus.None;
// - Move it to the front of the chain
list.RemoveAt(matchIndex);
list.Insert(0, candidateReplica);
// Set all active replicas to *ReadOnly*
foreach (ReplicaInfo replica in conf.GetCurrentReplicaChain())
{
if (replica.Status == ReplicaStatus.WriteOnly)
{
var msg = string.Format("View:\'{0}\' : can't set a WriteOnly replica to ReadOnly !!!", viewName);
ReplicatedTableLogger.LogError(msg);
throw new Exception(msg);
}
replica.Status = ReplicaStatus.ReadOnly;
}
// Update view id
conf.ViewId++;
}
private static void EnableWriteOnReplicas(string viewName, ReplicatedTableConfigurationStore conf, string storageAccountName)
{
List<ReplicaInfo> list = conf.ReplicaChain;
if (!list.Any() ||
list[0].StorageAccountName != storageAccountName)
{
return;
}
// First, enable Write on all replicas
foreach (ReplicaInfo replica in conf.GetCurrentReplicaChain())
{
replica.Status = ReplicaStatus.ReadWrite;
}
// Then, set the head to WriteOnly
list[0].Status = ReplicaStatus.WriteOnly;
// one replica chain ? Force to ReadWrite
if (conf.GetCurrentReplicaChain().Count == 1)
{
list[0].Status = ReplicaStatus.ReadWrite;
}
// Update view id
conf.ViewId++;
}
private void ThrowIfViewIsNotValid(string viewName, ReplicatedTableConfigurationStore config)
{
if (config.ReplicaChain == null || config.ReplicaChain.Any(replica => replica == null))
{
var msg = string.Format("View:\'{0}\' has a null replica(s) !!!", viewName);
throw new Exception(msg);
}
List<ReplicaInfo> chainList = config.GetCurrentReplicaChain();
if (chainList.Any())
{
/* RULE 1:
* =======
* Read replicas rule:
* - [R] replicas are contiguous from Tail backwards
* - [R] replica count >= 1
*/
string readPattern = "^W*R+$";
/* RULE 2:
* =======
* Write replicas rule:
* - [W] replicas are contiguous from Head onwards
* - [W] replica count = 0 or = ChainLength
*/
string writePattern = "^((R+)|(W+))$";
// Get replica sequences
string readSeq = "";
string writeSeq = "";
foreach (var replica in chainList)
{
// Read sequence:
if (replica.IsReadable())
{
readSeq += "R";
}
else
{
readSeq += "W";
}
// Write sequence:
if (replica.IsWritable())
{
writeSeq += "W";
}
else
{
writeSeq += "R";
}
}
// Verify RULE 1:
if (!Regex.IsMatch(readSeq, readPattern))
{
var msg = string.Format("View:\'{0}\' has invalid Read chain:\'{1}\' !!!", viewName, readSeq);
throw new Exception(msg);
}
// Verify RULE 2:
if (!Regex.IsMatch(writeSeq, writePattern))
{
var msg = string.Format("View:\'{0}\' has invalid Write chain:\'{1}\' !!!", viewName, writeSeq);
throw new Exception(msg);
}
}
}
public static View InitFromConfigVer2(string name, ReplicatedTableConfigurationStore configurationStore, Action<ReplicaInfo> SetConnectionString)
{
View view = new View(name);
if (configurationStore != null)
{
view.ViewId = configurationStore.ViewId;
foreach (ReplicaInfo replica in configurationStore.GetCurrentReplicaChain())
{
SetConnectionString(replica);
CloudTableClient tableClient = ReplicatedTableConfigurationManager.GetTableClientForReplica(replica);
if (tableClient != null)
{
view.Chain.Add(new Tuple<ReplicaInfo, CloudTableClient>(replica, tableClient));
}
}
// Infered: first readable replica
view.ReadHeadIndex = view.Chain.FindIndex(tuple => tuple.Item1.IsReadable());
}
return view;
}
