/// <summary>
/// Initializes a new instance of the <see cref="PseudoNodes"/> class.
/// </summary>
/// <param name="backend">the backend to use</param>
/// <param name="getSettingFunction">Function to get settings</param>
public PseudoNodes(RingMasterBackendCore backend, Func <string, string> getSettingFunction)
{
if (getSettingFunction == null)
{
getSettingFunction = (s) => null;
}
this.getSetting = getSettingFunction;
this.backend = backend;
this.serviceHealingMgr = new ServiceHealingManager(this);
}
/// <summary>
/// establishes a candidate for the new member set.
/// </summary>
/// <param name="clusterMemberset">cluste memberset</param>
/// <param name="proposedMemberset">proposed memberset</param>
public void EnableNewRuntimeMemberset(List <ClusterMember> clusterMemberset, List <ClusterMember> proposedMemberset)
{
this.newMapping = null;
if (clusterMemberset != null && proposedMemberset != null)
{
this.newMapping = ServiceHealingManager.GetMapping(clusterMemberset, proposedMemberset);
if (this.newMapping.Count == 0)
{
this.newMapping = null;
}
}
if (this.newMapping == null)
{
this.newMapping = null;
this.minMembers = int.MaxValue;
this.serviceHealingString = null;
}
else
{
if (proposedMemberset == null || clusterMemberset == null)
{
return;
}
if (clusterMemberset.Count == proposedMemberset.Count)
{
Trace.TraceInformation("EnableNewRuntimeMemberset: Service Healing detected: {0}", ServiceHealingManager.ToString(this.newMapping.Values));
}
else
{
Trace.TraceInformation("EnableNewRuntimeMemberset: Scale Out detected: {0}", ServiceHealingManager.ToString(this.newMapping.Values));
}
this.minMembers = (int)(clusterMemberset.Count / 2) + 1;
this.serviceHealingString = string.Format("Cluster={0}-Runtime={1}", ServiceHealingManager.ToString(clusterMemberset), ServiceHealingManager.ToString(proposedMemberset));
}
}
/// <summary>
/// updates the health pesudo-nodes
/// </summary>
private void UpdateHealthNodes()
{
try
{
string basepath = "/$metadata/health";
Dictionary <string, HealthDefinition> health = this.backend.Factory.GetHealth();
List <Op> ops = new List <Op>();
foreach (string child in this.self.GetChildren(basepath, false))
{
ops.Add(Op.Delete(basepath + "/" + child, -1, DeleteMode.SuccessEvenIfNodeDoesntExist));
}
foreach (KeyValuePair <string, HealthDefinition> line in health)
{
ops.Add(Op.Delete(basepath + "/" + line.Key + " : " + line.Value.Description, -1, DeleteMode.SuccessEvenIfNodeDoesntExist));
ops.Add(Op.Create(basepath + "/" + line.Key + " : " + line.Value.Description, null, null, CreateMode.Ephemeral));
}
string clusterpath = "/$metadata/clusterreplicaset";
foreach (string child in this.self.GetChildren(clusterpath, false))
{
ops.Add(Op.Delete(clusterpath + "/" + child, -1));
}
ops.Add(Op.Create(clusterpath + "/" + ServiceHealingManager.ToString(this.GetClusterMemberset()), null, null, CreateMode.Ephemeral | CreateMode.SuccessEvenIfNodeExistsFlag));
this.self.Multi(ops.AsReadOnly(), true, null, 0);
}
catch (Exception e)
{
Trace.TraceWarning("While UpdateHealthNodes: {0}", e);
}
}
