public bool OnMembershipChanged(MembershipChangeArgs args)
{
if (args != null)
{
if (LoggerManager.Instance.ShardLogger != null && LoggerManager.Instance.ShardLogger.IsDebugEnabled)
{
LoggerManager.Instance.ShardLogger.Debug("LocalShard.OnMembershipChanged()", "Membership change type: " + args.ChangeType);
}
switch (args.ChangeType)
{
case MembershipChangeArgs.MembershipChangeType.PrimarySet:
case MembershipChangeArgs.MembershipChangeType.PrimarySelected:
if (args.ServerName != null)
{
if (args.ServerName.Equals(context.LocalAddress))
{
lock (_mutexOnnodeRole)
{
NodeRole = Common.Configuration.Services.NodeRole.Primary;
}
}
else
{
lock (_mutexOnnodeRole)
{
if (NodeRole != NodeRole.Intermediate)
{
NodeRole = Common.Configuration.Services.NodeRole.Secondary;
}
}
}
Primary = new Server(args.ServerName, Status.Running);
if (LoggerManager.Instance.ShardLogger != null && LoggerManager.Instance.ShardLogger.IsInfoEnabled && args.ElectionId != null)
{
LoggerManager.Instance.ShardLogger.Info("LocalShard.OnMembershipChanged()", "This term's election id is: " + args.ElectionId.Id);
}
if (LoggerManager.Instance.ShardLogger != null && LoggerManager.Instance.ShardLogger.IsInfoEnabled)
{
if (args.ChangeType.Equals(MembershipChangeArgs.MembershipChangeType.PrimarySet))
{
LoggerManager.Instance.ShardLogger.Info("LocalShard.OnMembershipChanged()", "Node " + args.ServerName.IpAddress.ToString() + " set as the primary node for the shard.");
}
else if (args.ChangeType.Equals(MembershipChangeArgs.MembershipChangeType.PrimarySelected))
{
LoggerManager.Instance.ShardLogger.Info("LocalShard.OnMembershipChanged()", "Node " + args.ServerName.IpAddress.ToString() + " selected as the primary node for the shard.");
}
}
AppUtil.LogEvent(AppUtil.EventLogSource, string.Format("Node {0} is selected as primary for shard \"{1}\"", args.ServerName.ToString(), context.LocalShardName),
EventLogEntryType.Information, EventCategories.Information, EventID.PrimaySelected);
}
break;
case MembershipChangeArgs.MembershipChangeType.PrimaryLost:
case MembershipChangeArgs.MembershipChangeType.PrimaryDemoted:
case MembershipChangeArgs.MembershipChangeType.NodeLeft:
if (args.ServerName != null && Primary != null && args.ServerName.Equals(Primary.Address))
{
lock (_mutexOnnodeRole)
{
if (NodeRole != NodeRole.Intermediate)
{
NodeRole = Common.Configuration.Services.NodeRole.None;
}
}
Primary = null;
if (args.ServerName != null)
{
if (args.ChangeType.Equals(MembershipChangeArgs.MembershipChangeType.PrimaryDemoted))
{
AppUtil.LogEvent(AppUtil.EventLogSource, string.Format("Primary Node {0} is demoted for shard \"{1}\"", args.ServerName.ToString(), context.LocalShardName),
EventLogEntryType.Warning, EventCategories.Warning, EventID.PrimaryLost);
if (LoggerManager.Instance.ShardLogger != null && LoggerManager.Instance.ShardLogger.IsWarnEnabled)
{
LoggerManager.Instance.ShardLogger.Warn("LocalShard.OnMembershipChanged()", "The primary " + args.ServerName.ToString() + " is demoted.");
}
}
else if (args.ChangeType.Equals(MembershipChangeArgs.MembershipChangeType.PrimaryLost))
{
AppUtil.LogEvent(AppUtil.EventLogSource, string.Format("Connection with the primary node {0} lost \"{1}\"", args.ServerName.ToString(), context.LocalShardName),
EventLogEntryType.Warning, EventCategories.Warning, EventID.PrimaryLost);
if (LoggerManager.Instance.ShardLogger != null && LoggerManager.Instance.ShardLogger.IsWarnEnabled)
{
LoggerManager.Instance.ShardLogger.Warn("LocalShard.OnMembershipChanged()", "The primary " + args.ServerName.ToString() + " is lost.");
}
}
}
}
_clusterConfigMgr.UpdateClusterConfiguration();
if (args.ServerName != null)
{
ShardConfiguration sConfig = null;
if (_clusterConfigMgr != null && _clusterConfigMgr.LatestConfiguration != null && _clusterConfigMgr.LatestConfiguration.Deployment != null)
{
sConfig = _clusterConfigMgr.LatestConfiguration.Deployment.GetShardConfiguration(context.LocalShardName);
}
{
ServerNode node = null;
if (sConfig != null && sConfig.Servers != null)
{
node = sConfig.Servers.GetServerNode(args.ServerName.IpAddress.ToString());
}
if (node == null)
{
if (_connectionRestoration != null)
{
BrokenConnectionInfo info = new BrokenConnectionInfo();
info.BrokenAddress = args.ServerName;
info.SessionType = SessionTypes.Shard;
_connectionRestoration.UnregisterListener(info);
}
}
}
}
break;
case MembershipChangeArgs.MembershipChangeType.TimeoutOnRestrictedPrimary:
return(_membershipManager.AbortTakeoverMechanismTask(args));
case MembershipChangeArgs.MembershipChangeType.ForcefullyDemotePrimary:
return(_membershipManager.OnForcefulPrimaryDemotion(args));
}
if (_membershipManager != null)
{
_membershipManager.UpdateLocalMembership(args);
if (context != null && context.DatabasesManager != null &&
(args.ChangeType == MembershipChangeArgs.MembershipChangeType.PrimarySet ||
(args.ChangeType == MembershipChangeArgs.MembershipChangeType.PrimarySelected)))
{
context.DatabasesManager.ElectionResult = _membershipManager.LatestMembership.ElectionId;
context.ElectionResult = new ElectionResult();
context.ElectionResult.ElectionId = _membershipManager.LatestMembership.ElectionId;
}
DatabaseMessage primaryChangedMessage = new DatabaseMessage();
primaryChangedMessage.OpCode = OpCode.PrimaryChanged;
IShardListener listener = _shardListeners[Common.MiscUtil.CLUSTER_MANAGER];
listener.OnMessageReceived(primaryChangedMessage, new Server(context.LocalAddress, Status.Running));
}
}
return(false);
}