private void TryRemoveFromView(string deadURL)
{
lock (SuspectedDead){
if (SuspectedDead.ContainsKey(deadURL) || !TSMan.ServerView.Contains(deadURL))
{
return;
}
SuspectedDead.Add(deadURL, 0);
}
Console.WriteLine("Suspect dead: " + deadURL);
List <string> serversUrl = TSMan.ServerView.DeepUrlsCopy();
AsyncCallback remoteCallback = new AsyncCallback(RemoveFromViewCallback);
// Send vote requests to remove suspected dead server from view
TSpaceAdvServerSMR server;
foreach (string serverUrl in serversUrl)
{
server = (TSpaceAdvServerSMR)Activator.GetObject(typeof(ITSpaceServer), serverUrl);
RemoteDeletefromViewDelegate remoteDel = new RemoteDeletefromViewDelegate(server.TryConnection);
try
{
// Call remote method
remoteDel.BeginInvoke(deadURL, false, remoteCallback, deadURL);
}
catch (Exception) { }
}
Monitor.Enter(SuspectedDead);
//TODO: Change quorum to update on view change and be just variable
while (SuspectedDead.ContainsKey(deadURL) &&
(SuspectedDead[deadURL] < TSMan.Quorum(TSMan.ServerView.GetUrls().Count)))
{
Monitor.Wait(SuspectedDead);
}
Monitor.Exit(SuspectedDead);
Console.WriteLine("Confirmed dead: " + deadURL);
lock (SuspectedDead)
{
//Already has been removed
if (!SuspectedDead.ContainsKey(deadURL))
{
return;
}
}
// Get operation sequence number
string operationID = TSMan.URL + "_" + (ViewUpdateCounter++);
int seqNum = GetSequenceNumber(operationID, deadURL);
//Send view update to all servers and wait for majority
UpdateView(deadURL, operationID, serversUrl, seqNum, false);
}
private void RemoveFromViewCallback(IAsyncResult result)
{
string serverURL = (string)result.AsyncState;
RemoteDeletefromViewDelegate del = (RemoteDeletefromViewDelegate)((AsyncResult)result).AsyncDelegate;
// Retrieve results.
bool isDead = !del.EndInvoke(result);
lock (SuspectedDead)
{
if (isDead && SuspectedDead.ContainsKey(serverURL))
{
SuspectedDead[serverURL]++;
}
Monitor.PulseAll(SuspectedDead);
}
}