public override void Start()
{
MetadataServer.PauseServer( );
long[] state = MetadataServer.GetQueueStateVector( );
Console.WriteLine("View Pause with state: " + state.ToArray());
Manager.UpdateViewServerState(ServerStatus.Pause, MetadataServer.ThisMetaserverId, state);
// ask Paused to other
Manager.MulticastMsg(new ViewMsg(ViewMsgType.StatusUpdate, ServerStatus.Pause, Manager.ThisMetaserverId, state));
//Wait to know the state of all new servers
//Se houver algum online, paused ou ready, queremos saber o estado dele
//Verificar quais as maiores posicoes
long[] lastestStatus = WaitUntilSameStatus(state);
//Deliver all message on application layer
Console.WriteLine("All message delivered");
//Change state to ready
Manager.ToReady();
}
private Boolean UpdateFromServers(List <int> serverIds)
{
foreach (int serverId in serverIds)
{
Console.WriteLine("Copy from : " + serverId);
IMetaToMeta server = MetadataServer.ConnectToMetaserver(serverId);
//Request copy from master
try
{
CopyStructMetadata dataStruct = server.RequestUpdate(MetadataServer.GetQueueStateVector(), MetadataServer.ThisMetaserverId);
//Update the server
MetadataServer.UpdateServer(dataStruct);
}
catch (SocketException)
{
return(false);
}
}
return(true);
}
public override ViewMsg NewRowdyMsgRequest(int source)
{
return(new ViewMsg(ViewMsgType.StatusUpdate, ServerStatus.Off, Manager.ThisMetaserverId, MetadataServer.GetQueueStateVector( )));
}
///////////////////////////////////////////////// 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);
}
}
/// <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( );
}
public override void Start()
{
Console.WriteLine("View new");
MetadataServer.PauseServer();
//Multicast All to STOP. All servers will change to Paused.
Manager.MulticastMsg(new ViewMsg(ViewMsgType.NewRowdy, ServerStatus.New, Manager.ThisMetaserverId, MetadataServer.GetQueueStateVector( )));
//ViewStatusChanged will finish and change status:
//Aguardar que os restantes passem a off ou a paused (ou se for novo, segue
while (!CheckIfStatusIsKnown())
{
lock (locker)
{
Monitor.Wait(locker, 1000);
}
}
CopyProcess( );
if (Manager.CountOnServers( ) == 1)
{
Console.WriteLine("Single server ");
Manager.ToOnline( );
return;
}
//Change state to ready
Manager.ToReady();
}
public override ViewMsg NewRowdyMsgRequest(int source)
{
//This server is already Ready so just waiting
return(new ViewMsg(ViewMsgType.StatusUpdate, ServerStatus.Ready, Manager.ThisMetaserverId, MetadataServer.GetQueueStateVector( )));
}
public override void Start()
{
Console.WriteLine("View Ready");
//Multicast I'm ready
//Multicast All to STOP. All servers will change to Paused.
Manager.MulticastMsg(new ViewMsg(ViewMsgType.StatusUpdate, ServerStatus.Ready, Manager.ThisMetaserverId, MetadataServer.GetQueueStateVector( )));
//Wait for all server being ready
//All servers are paused or off
// Wait until at least on server is ready
while (!CheckIfAllServerReady( ))
{
lock ( serversReadyLocker )
{
Monitor.Wait(serversReadyLocker, 1000);
}
//TODO ao fim de X, voltar atrás e ver se falharam
}
//Change to Online
Manager.ToOnline();
}
public override void Start()
{
Console.WriteLine("View online");
Manager.MulticastMsg(new ViewMsg(ViewMsgType.StatusUpdate, ServerStatus.Online, Manager.ThisMetaserverId, MetadataServer.GetQueueStateVector( )));
// verificar que todos os estao online ou off agora
var availableServerStatus = new List <ServerStatus> {
ServerStatus.Off, ServerStatus.Online
};
while (!Manager.CheckServerStatus(availableServerStatus, false))
{
Thread.Sleep(100);
}
//Restart receiving requests
MetadataServer.PlayServer();
Console.WriteLine("Server recovered!! ");
}