public IResponse VisitStartViewChange(StartViewChange startViewChange)
{
if (this.replicaState.HandlerStateChanged.WaitOne(Timeout.TIMEOUT_VIEW_CHANGE) &&
this.replicaState.State is ViewChangeMessageProcessor)
{
return(startViewChange.Accept(this.replicaState.State));
}
return(null);
}
public IResponse VisitStartViewChange(StartViewChange startViewChange)
{
if (startViewChange.ViewNumber <= this.replicaState.ViewNumber)
{
return(null);
}
if (startViewChange.ViewNumber == this.viewNumber &&
ConfigurationUtils.CompareConfigurations(startViewChange.Configuration, this.configuration))
{
return(new StartViewChangeOk(this.replicaState.ServerId, this.viewNumber, this.configuration));
}
Log.Debug("Received Start View Change that don't match.");
return(null);
}
private void MulticastStartViewChange()
{
IMessage message = new StartViewChange(this.replicaState.ServerId, this.viewNumber, this.configuration);
Uri[] currentConfiguration = this.replicaState.ReplicasUrl.ToArray();
IResponses responses = this.messageServiceClient.RequestMulticast(
message,
currentConfiguration,
this.replicaState.Configuration.Count / 2,
(int)(Timeout.TIMEOUT_VIEW_CHANGE),
true);
IResponse[] responsesVector = responses.ToArray();
// There was no quorum to accept the view change
if (responsesVector.Length < this.numberToWait)
{
Log.Debug($"There was no quorum for view change. " +
$"Just received {responsesVector.Length} from at least {this.numberToWait}");
this.replicaState.ChangeToNormalState();
return;
}
// In case I'm the leader, wait for f DoViewChange
if (this.imTheLeader)
{
this.CheckNumberAndSetNewConfiguration();
}
else
{
// Else, send DoViewChange to leader
Uri leader = this.configuration.Values.ToArray()[0];
IMessage doViewMessage = new DoViewChange(
this.replicaState.ServerId,
this.viewNumber,
this.replicaState.ViewNumber,
this.configuration,
this.replicaState.Logger,
this.replicaState.OpNumber,
this.replicaState.CommitNumber);
this.messageServiceClient.Request(doViewMessage, leader, -1);
}
}
public IResponse VisitStartViewChange(StartViewChange startViewChange)
{
return(this.WaitNormalState(startViewChange));
}
