/// <summary>
/// Callback function to process take's server' replies
/// <param name="ar"A AsyncResult Delgate Object.</param>
/// </summary>
public static void CallbackTake(IAsyncResult ar)
{
RemoteAsyncTakeDelegate del = (RemoteAsyncTakeDelegate)((AsyncResult)ar).AsyncDelegate;
lock (TakeLock)
{
_responseTake.Add(del.EndInvoke(ar));
takeHandles[takeCounter++].Set();
if (takeCounter == numServers)
{
takeCounter = 0;
}
}
}
public Tuple Take(Tuple tuple)
{
bool ViewOutOfDate = true;
while (ViewOutOfDate)
{
View actualView = this.GetView();
int numberServers = actualView.Servers.Count;
numServers = numberServers;
takeHandles = new AutoResetEvent[numberServers];
for (int i = 0; i < actualView.Servers.Count; i++)
{
takeHandles[i] = new AutoResetEvent(false);
}
Console.WriteLine("Vou tentar take: " + tuple);
List <string> toRemove = new List <string>();
_responseTake = new List <List <Tuple> >();
foreach (string serverPath in actualView.Servers)
{
try
{
ITupleSpaceXL server = (ITupleSpaceXL)Activator.GetObject(typeof(ITupleSpaceXL), serverPath);
RemoteAsyncTakeDelegate RemoteDel = new RemoteAsyncTakeDelegate(server.take);
AsyncCallback RemoteCallback = new AsyncCallback(CallbackTake);
IAsyncResult RemAr = RemoteDel.BeginInvoke(_workerId, _requestId, tuple, _view, CallbackTake, null);
ViewOutOfDate = false;
}
catch (System.Net.Sockets.SocketException)
{
Console.WriteLine("** FRONTEND TAKE: Could not call take on server " + serverPath);
}
}
//miguel: this only works in perfect case
//TODO: One machine belonging to the view has just crashed
WaitHandle.WaitAll(takeHandles, 10000);
if (_responseTake.Count != _view.Servers.Count)
{
takeCounter = 0;
foreach (string s in _view.Servers)
{
try
{
ITupleSpaceXL tupleSpace = (ITupleSpaceXL)Activator.GetObject(typeof(ITupleSpaceXL), s);
tupleSpace.checkView();
}
catch (Exception) { Console.WriteLine("Server " + s + " is dead."); }
}
if (_responseTake.Count > 0)
{
ViewOutOfDate = false;
}
}
else
{
if (_responseTake.Contains(null) == true)
{
Console.WriteLine("** FRONTEND TAKE: View has been changed.");
_requestId++;
}
else
{
ViewOutOfDate = false;
}
}
}
//Performs the intersection of all responses and decide using TupleSelection
Tuple tup = TupleSelection(Intersection(_responseTake));
if (tup == null)
{
Remove(null);
}
//Tuple tup is now selected lets remove
if (tup != null)
{
Remove(tup);
}
_requestId++;
if (tup != null)
{
Console.WriteLine("** FRONTEND TAKE: Here is a response: " + tup);
}
else
{
Console.WriteLine("** FRONTEND TAKE: Here is a NULL response");
}
return(tup);
}
