/// <summary>
/// Delete the entry corresponding to this logical node name from the node mapping table
/// as well as the local cache.
/// </summary>
/// <param name="logicalNodeName"></param>
public void DeleteNodeMappingEntry(string logicalNodeName)
{
lock (this._operationLock)
{
try
{
this.RefreshWhenNeeded();
//Update the node mapping table by deleting the entry corresponding to this logical node name
CloudTable table = this.TableClient.GetTableReference(this.NodeMappingTableName);
TableOperation retrieveOperation = TableOperation.Retrieve <NodeMappingTableEntry>(AzureNaming.AzurePartitionKey, logicalNodeName.ToUpper());
NodeMappingTableEntry entry = null;
TableResult retrievedResult = table.Execute(retrieveOperation);
if (retrievedResult.Result != null)
{
entry = (NodeMappingTableEntry)retrievedResult.Result;
}
if (entry != null)
{
TableOperation deleteOperation = TableOperation.Delete(entry);
table.Execute(deleteOperation);
}
//Update the cache
string physicalEpr = null;
if (this._logicalNameToPhysicalEprMapping.TryGetValue(logicalNodeName, out physicalEpr))
{
this._logicalNameToPhysicalEprMapping.Remove(logicalNodeName);
this._logicalNameToPhysicalInstanceMapping.Remove(logicalNodeName);
}
if (physicalEpr != null)
{
this._physicalEprToLogicalNameMapping.Remove(physicalEpr);
}
}
catch (Exception)
{
//It will get traced in the calling module
this.TableClient = null;
//If there is any error deleting the entry from the node mapping table
//mark the cache for refresh the next time it is accessed
this._needRefreshOnNextOperation = true;
//Any retry logic should be in the caller
throw;
}
}
}
/// <summary>
/// refresh the node mapping from Azure storage table for a specific logical node
/// this is used for SOA proxy to update the node mapping info
/// </summary>
/// <param name="logicalNodeName">the node logical name</param>
public void RefreshNodeMapping(string logicalNodeName)
{
lock (this._operationLock)
{
try
{
//Retrieve the node entry from node mapping table by the logical node name
CloudTable table = this.TableClient.GetTableReference(this.NodeMappingTableName);
TableOperation retrieveOperation = TableOperation.Retrieve <NodeMappingTableEntry>(AzureNaming.AzurePartitionKey, logicalNodeName.ToUpper());
NodeMappingTableEntry entry = null;
TableResult retrievedResult = table.Execute(retrieveOperation);
if (retrievedResult.Result != null)
{
entry = (NodeMappingTableEntry)retrievedResult.Result;
}
if (entry != null)
{
//Update the cache if the epr in the cache is out-of-date
string physicalEpr = null;
if (this._logicalNameToPhysicalEprMapping.TryGetValue(entry.NodeName, out physicalEpr))
{
if (!string.Equals(physicalEpr, entry.EndpointString, StringComparison.OrdinalIgnoreCase))
{
this._logicalNameToPhysicalEprMapping[entry.NodeName] = entry.EndpointString;
this._logicalNameToPhysicalInstanceMapping[entry.NodeName] = entry.RoleInstanceName;
this._physicalEprToLogicalNameMapping[entry.EndpointString] = entry.NodeName;
}
}
else
{
//insert the node mapping info in the cache
this._logicalNameToPhysicalEprMapping[entry.NodeName] = entry.EndpointString;
this._logicalNameToPhysicalInstanceMapping[entry.NodeName] = entry.RoleInstanceName;
this._physicalEprToLogicalNameMapping[entry.EndpointString] = entry.NodeName;
}
}
}
catch (Exception)
{
//It will get traced in the calling module
this.TableClient = null;
//Any retry logic should be in the caller
throw;
}
}
}
/// <summary>
/// THIS IS FOR SCHEDULER INTERNAL USE ONLY!
/// The format of endpoint string is: [ip]:[port1]:[port2]:...
/// There is no protocol prefix!
/// </summary>
/// <param name="items"></param>
public void UpdateNodeMapping(KeyValuePair <string, string>[] items, Dictionary <string, string> nodeNameToRoleName, Dictionary <string, string> nodeNameToInstanceName)
{
lock (this._operationLock)
{
this.RefreshWhenNeeded();
try
{
CloudTable table = this.TableClient.GetTableReference(this.NodeMappingTableName);
foreach (KeyValuePair <string, string> item in items)
{
string nodeName = item.Key;
string endpointString = item.Value;
string instanceId = null;
nodeNameToInstanceName.TryGetValue(nodeName, out instanceId);
// Update the storage first
string existingEndpointStr = null;
string existingInstanceId = null;
if (this._logicalNameToPhysicalEprMapping.TryGetValue(nodeName, out existingEndpointStr))
{
if (string.Compare(endpointString, existingEndpointStr, StringComparison.InvariantCultureIgnoreCase) == 0)
{
if (!this._logicalNameToPhysicalInstanceMapping.TryGetValue(nodeName, out existingInstanceId) ||
string.Compare(instanceId, existingInstanceId, StringComparison.InvariantCultureIgnoreCase) == 0)
{
// No need to update
continue;
}
}
// Update the storage
NodeMappingTableEntry entry = null;
try
{
TableOperation retrieveOperation = TableOperation.Retrieve <NodeMappingTableEntry>(AzureNaming.AzurePartitionKey, nodeName.ToUpper());
TableResult retrievedResult = table.Execute(retrieveOperation);
if (retrievedResult.Result != null)
{
entry = (NodeMappingTableEntry)retrievedResult.Result;
}
}
catch
{
// Swallow the ResourceNotFound exception, and leave the entry to be null
}
if (endpointString == null)
{
// Remove the binding
TableOperation deleteOperation = TableOperation.Delete(entry);
table.Execute(deleteOperation);
}
else
{
entry.EndpointString = endpointString;
entry.RoleInstanceName = instanceId;
TableOperation updateOperation = TableOperation.Replace(entry);
table.Execute(updateOperation);
}
}
else
{
if (endpointString == null)
{
// We don't save a null phyical address
continue;
}
// Add to the storage table
Debug.Assert(nodeNameToRoleName.ContainsKey(nodeName));
NodeMappingTableEntry entry = new NodeMappingTableEntry(nodeName.ToUpper(), endpointString, nodeNameToRoleName[nodeName], nodeNameToInstanceName[nodeName]);
TableOperation insertOperation = TableOperation.Insert(entry);
table.Execute(insertOperation);
}
}
// Now update the cache at last
foreach (KeyValuePair <string, string> item in items)
{
string originalEndpointString;
if (this._logicalNameToPhysicalEprMapping.TryGetValue(item.Key, out originalEndpointString))
{
this._physicalEprToLogicalNameMapping.Remove(originalEndpointString);
}
if (item.Value == null)
{
// This means remove the binding
this._logicalNameToPhysicalEprMapping.Remove(item.Key);
this._logicalNameToPhysicalInstanceMapping.Remove(item.Key);
}
else
{
// This means update the binding
this._logicalNameToPhysicalEprMapping[item.Key] = item.Value;
this._physicalEprToLogicalNameMapping[item.Value] = item.Key;
string instanceId = null;
if (nodeNameToRoleName.TryGetValue(item.Key, out instanceId))
{
this._logicalNameToPhysicalInstanceMapping[item.Key] = instanceId;
}
}
}
}
catch (Exception)
{
this.TableClient = null;
this._needRefreshOnNextOperation = true;
throw;
}
}
}
