internal void OnConfigurationChanged(ConfigChangeEventArgs arguments)
{
if (arguments != null && _clusterConfigMgr != null)
{
_clusterConfigMgr.UpdateClusterConfiguration();
Address affectedNode = null;
if (arguments.EventParameters != null && arguments.EventParameters.ContainsKey(EventParamName.NodeAddress))
{
affectedNode = arguments.GetParamValue <Address>(EventParamName.NodeAddress);
}
ChangeType type = arguments.GetParamValue <ChangeType>(EventParamName.ConfigurationChangeType);
if ((type != ChangeType.NodeLeft && type != ChangeType.PrimaryGone) && affectedNode == null)
{
return;
}
if (_membershipManager != null)
{
switch (type)
{
//RTD: look for a better way to handle this scenario.
case ChangeType.NodeAdded:
_membershipManager.OnMemberJoined(new Server(affectedNode, Status.Running));
break;
case ChangeType.NodeRemoved:
_membershipManager.OnMemberLeft(new Server(affectedNode, Status.Running));
break;
case ChangeType.PriorityChanged:
_membershipManager.SanityCheckForTakeoverElect();
break;
case ChangeType.NodeLeft:
//this is the event received by the CS when the leaving node is a primary. Tada-- Why
case ChangeType.PrimaryGone:
Membership membership = null;
if (arguments.EventParameters.ContainsKey(EventParamName.Membership))
{
membership = arguments.GetParamValue <Membership>(EventParamName.Membership);
}
if (membership != null && membership.Servers != null)
{
ShardConfiguration sConfig = _clusterConfigMgr.GetShardConfiguration(context.LocalShardName);
if (sConfig != null && sConfig.Servers != null)
{
foreach (KeyValuePair <string, ServerNode> node in sConfig.Servers.Nodes)
{
if (!membership.Servers.Contains(node.Value))
{
affectedNode = new Address(node.Value.Name, sConfig.Port);
break;
}
}
}
if (affectedNode != null && _shardChannels != null && !_shardChannels.ContainsKey(new Server(affectedNode, Status.Running)))
{
_membershipManager.OnActivityTriggered(Activity.NodeLeaving, affectedNode);
_membershipManager.OnMemberLeft(new Server(affectedNode, Status.Running));
_membershipManager.OnActivityComplete();
}
}
break;
}
}
}
}