///////////////////////////////////////////////// Input //////////////////////////////////////////////
/// <summary>
/// Remote Requests: Aqui recebo os pedidos remotos
/// </summary>
/// <param name="msg"></param>
/// <returns></returns>
public ViewMsg BullyRequestsRetrival(ViewMsg msg)
{
switch (msg.Type)
{
case ViewMsgType.NewRowdy:
Console.WriteLine("Retrieve: New Rowdy from: " + msg.Source);
UpdateViewServerState(ServerStatus.New, msg.Source, null);
return(ServerViewState.NewRowdyMsgRequest(msg.Source));
case ViewMsgType.StatusUpdate:
Console.WriteLine("Retrieve: Status Update from: " + msg.Source + " : " + msg.Status);
UpdateViewServerState(msg.Status, msg.Source, msg.StateVector);
ServerViewState.ViewStatusChanged();
return(new ViewMsg(ViewMsgType.StatusUpdate, GetStatus(ThisMetaserverId), ThisMetaserverId, MetadataServer.GetQueueStateVector( )));
case ViewMsgType.ServerBetray:
int betrayed = msg.Betrayed;
Console.WriteLine("Server betray: " + betrayed);
if (betrayed == ThisMetaserverId)
{
// Detecta que alguem me está a expulsar e eu estou ligado
Console.WriteLine("Server " + msg.Source + " is cheating on me!!!! I will go to new");
ToNew(true);
}
ServerBetray(msg.Betrayed, msg.Source);
return(null);
default:
Console.WriteLine("Invalide Request type:" + msg.Type + " from " + msg.Source);
throw new Exception("Invalid Request msg: " + msg.Type);
}
}
public void MulticastMsg(ViewMsg msg)
{
msg.Source = ThisMetaserverId;
msg.Status = GetStatus(ThisMetaserverId);
ViewElementsMutex.WaitOne( );
//Contact other servers
for (int id = 0; id < ViewElements.Length; id++)
{
if (id == ThisMetaserverId)
{
continue;
}
// if ( GetStatus( id ) == ServerStatus.Off )
// continue;
msg.Destination = id;
log.Debug(DateTime.Now.Ticks + " [M] Multicast View: " + msg.Status);
IMetaToMeta server = MetadataServer.ConnectToMetaserver(id);
BullyDel invokeDel = new BullyDel(server.BullyRequestsRetrival);
AsyncCallback callback = new AsyncCallback(BullyResponse);
try
{
Console.WriteLine("Multicast: " + msg + " to " + msg.Destination);
invokeDel.BeginInvoke(msg, callback, null);
}
catch (SocketException)
{
UpdateViewServerState(ServerStatus.Off, id, null);
}
}
ViewElementsMutex.ReleaseMutex( );
}
/// <summary>
/// Aqui recebo as respostas
/// </summary>
/// <param name="ar"></param>
private void BullyResponse(IAsyncResult ar)
{
BullyDel del = (BullyDel)((AsyncResult)ar).AsyncDelegate;
ViewMsg msg = del.EndInvoke(ar);
new ProcessResponseDel(ProcessResponse).Invoke(msg);
}
/// <summary>
/// Deunnciar que existe um servidor que falhou
/// </summary>
/// <param name="betrayedServer"></param>
/// <param name="knownFrom">Quem o avisou</param>
public void ServerBetray(int betrayedServer, int knownFrom)
{
//Anunciar aos restantes da view que este falhou.
ViewMsg msg = new ViewMsg(ViewMsgType.ServerBetray, GetStatus(ThisMetaserverId), ThisMetaserverId, MetadataServer.GetQueueStateVector( ));
msg.Source = ThisMetaserverId;
msg.Status = GetStatus(ThisMetaserverId);
msg.Betrayed = betrayedServer;
ViewElementsMutex.WaitOne( );
//Contact other servers
for (int id = 0; id < ViewElements.Length; id++)
{
if (id == ThisMetaserverId || id == knownFrom)
{
continue;
}
if (ViewElements[id] == ServerStatus.Off)
{
Console.WriteLine("Already betrayed" + id);
continue;
}
msg.Destination = id;
try
{
Console.WriteLine("Betray: " + betrayedServer + " to " + msg.Destination);
MetadataServer.ConnectToMetaserver(id).BullyRequestsRetrival(msg);
}
catch (SocketException) {
UpdateViewServerState(ServerStatus.Off, id, null);
if (id != betrayedServer && !(ViewElements[id].Equals(ServerStatus.Off)))
{
ServerBetray(id, ThisMetaserverId);
}
}
}
//Retirar este servidor da minha view
Console.WriteLine("Remove betrayed: " + betrayedServer);
RemoveServerFromView(betrayedServer);
ViewElementsMutex.ReleaseMutex( );
}
private void ProcessResponse(ViewMsg msg)
{
if (msg == null)
{
return;
}
switch (msg.Type)
{
case ViewMsgType.StatusUpdate:
Console.WriteLine("Retrieve: Status Update from: " + msg.Source + " : " + msg.Status);
UpdateViewServerState(msg.Status, msg.Source, msg.StateVector);
ServerViewState.ViewStatusChanged();
break;
default:
Console.WriteLine("Invalide Response type:" + msg.Type + " from " + msg.Source);
throw new Exception("Invalid msg type received:" + msg.Type);
}
}
public ViewMsg BullyRequestsRetrival(ViewMsg msg)
{
return(ViewManager.BullyRequestsRetrival(msg));
}
