private int SendPrepareMessage(ClientRequest clientRequest)
{
int viewNumber;
int opNumber;
int commitNumber;
Uri[] replicasUrls;
lock (this.replicaState) {
viewNumber = this.replicaState.ViewNumber;
commitNumber = this.replicaState.CommitNumber;
opNumber = this.replicaState.IncrementOpNumberNumber();
this.replicaState.Logger.Add(clientRequest);
replicasUrls = this.replicaState.ReplicasUrl.ToArray();
}
PrepareMessage prepareMessage = new PrepareMessage(
this.replicaState.ServerId,
viewNumber,
clientRequest,
opNumber,
commitNumber);
// Wait for (Number backup replicas + the leader) / 2
int f = this.replicaState.Configuration.Count / 2;
this.messageServiceClient.RequestMulticast(prepareMessage, replicasUrls, f, -1, true);
return(opNumber);
}
public IResponse VisitPrepareMessage(PrepareMessage prepareMessage)
{
if (prepareMessage.ViewNumber < this.replicaState.ViewNumber)
{
return(null);
}
if (this.replicaState.OpNumber >= prepareMessage.OpNumber)
{
return(new PrepareOk(this.replicaState.ServerId, this.replicaState.ViewNumber, prepareMessage.OpNumber));
}
// It must wait for previous messages.
while (this.replicaState.OpNumber != (prepareMessage.OpNumber - 1))
{
if (prepareMessage.ViewNumber < this.replicaState.ViewNumber)
{
return(null);
}
if (this.replicaState.OpNumber >= prepareMessage.OpNumber - 1)
{
return(new PrepareOk(this.replicaState.ServerId, this.replicaState.ViewNumber, prepareMessage.OpNumber));
}
this.replicaState.HandlersPrepare.WaitOne();
}
int opNumber;
int replicaView;
lock (this.replicaState) {
replicaView = this.replicaState.ViewNumber;
opNumber = this.replicaState.IncrementOpNumberNumber();
this.replicaState.Logger.Add(prepareMessage.ClientRequest);
}
// Notify all threads that are waiting for new prepare messages
this.replicaState.HandlersPrepare.Set();
this.replicaState.HandlersPrepare.Reset();
this.replicaState.HandlersCommits.Set();
this.replicaState.HandlersCommits.Reset();
return(new PrepareOk(this.replicaState.ServerId, replicaView, opNumber));
}
/// <summary>
/// SOLID:
/// Falhas:
/// - Apenas escreve no ecrã. E se quisermos escrever num ficheiro?
/// - Apenas escreve "Olá MUndo"...e se quisermos escrever outras coisa?
/// - E se quisermos a acrescentar mais "features"?
/// - ????
/// </summary>
static void Main1()
{
//1
//Console.WriteLine("Ola Mundo");
//2
IGetMessage mensagem = new ConsoleGetMessage();
ITextWriter writer = new ConsoleTextWriter();
//auxiliar
PrepareMessage msg = new PrepareMessage(mensagem, writer);
msg.Go();
ITextWriter writer2 = new FileTextWriter();
PrepareMessage msg2 = new PrepareMessage(mensagem, writer2);
msg2.Go();
Console.ReadKey();
}
public IResponse VisitPrepareMessage(PrepareMessage prepareMessage)
{
return(this.WaitNormalState(prepareMessage));
}
public static void Handle(
PrepareMessage message,
Replica replica,
byte[] replicaSecret,
out int[] block,
out string secretShare,
out Dictionary <int, uint> childSecretHashes,
out uint secretHash,
Dictionary <int, CancellationTokenSource> secretShareMessageTokenSources)
{
block = message.Block;
var requestCounterViewNumber = message.RequestCounterViewNumber;
replica.Tee.VerifyCounter(
replica.PrimaryReplica.PublicKey,
requestCounterViewNumber,
replicaSecret,
out secretShare,
out childSecretHashes,
out secretHash);
if (replica.ChildReplicas.Any())
{
foreach (var childReplica in replica.ChildReplicas)
{
var tokenSource = new CancellationTokenSource();
Task.Delay(5000, tokenSource.Token)
.ContinueWith(t =>
{
if (!t.IsCanceled)
{
// we send message about a suspected replica to the primary replica
Network.EmulateLatency();
replica.PrimaryReplica.SendMessage(
new SuspectMessage
{
ReplicaId = childReplica.Id
});
}
});
secretShareMessageTokenSources.Add(childReplica.Id, tokenSource);
}
}
else
{
// we send a message with a secret share to the parent replica
Network.EmulateLatency();
replica.ParentReplica.SendMessage(
new SecretShareMessage
{
ReplicaId = replica.Id,
ReplicaSecretShares = new Dictionary <int, string> {
{ replica.Id, secretShare }
}
});
Log(replica, "Send a secret to the parent replica (ParentReplicaId: {0})", replica.ParentReplica.Id);
}
}
