public List <IServerService> getView(List <IServerService> view)
{
int numServers;
if (view.Count == 0)
{
Console.WriteLine("No connections found. Broadcasting...");
view = serverRemoteObjects;
numServers = ConfigurationManager.AppSettings.AllKeys.Count(); //TODO use same file for client and server!!
}
else
{
numServers = view.Count;
}
WaitHandle[] handles = new WaitHandle[numServers];
Console.WriteLine("Broadcasting to " + numServers + " servers...");
IAsyncResult[] asyncResults = new IAsyncResult[numServers]; //used when want to access IAsyncResult in index of handled that give the signal
try {
for (int i = 0; i < numServers; i++)
{
IServerService remoteObject = view[i];
requestViewDelegate viewDel = new requestViewDelegate(remoteObject.ViewRequest);
Console.WriteLine(i);
IAsyncResult ar = viewDel.BeginInvoke(null, null);
asyncResults[i] = ar;
handles[i] = ar.AsyncWaitHandle;
}
int indxAsync = WaitHandle.WaitAny(handles, 300); //Wait for the first answer from the servers
if (indxAsync == WaitHandle.WaitTimeout)
{
Console.WriteLine("timeout with " + numServers.ToString());
getView(view);
}
else
{
IAsyncResult asyncResult = asyncResults[indxAsync];
requestViewDelegate viewDel = (requestViewDelegate)((AsyncResult)asyncResult).AsyncDelegate;
try {
List <string> servers = viewDel.EndInvoke(asyncResult);
if (servers.Count() != 0)
{
List <IServerService> serverobjs = new List <IServerService>();
for (int j = 0; j < servers.Count; j++)
{
Console.WriteLine("answer from " + indxAsync + ": " + servers[j] + "(" + servers.Count + ")");
serverobjs.Add((IServerService)Activator.GetObject(typeof(IServerService), servers[j]));
}
return(serverobjs);
}
else
{
return(getView(view)); //TODO? I dont like this
}
}
catch (SocketException) {
Console.WriteLine("ERROR: view is " + view.Count());
Console.WriteLine("Server " + indxAsync + " is down. Restarting...");
List <IServerService> newView = view;
newView.RemoveAt(indxAsync);
Console.WriteLine("Trying again with " + newView.Count);
return(getView(newView));
}
}
}
catch (SocketException e) {
Console.WriteLine("Connection error. Restarting...");
return(getView(serverRemoteObjects)); //TODO? isto acho que nao precisa de estar aqui (este catch)
}
Console.WriteLine("you shouldnt be here");
return(null);
}
public List <IServerService> getView(List <IServerService> view)
{
int numServers;
if (view.Count == 0)
{
Console.WriteLine("No connections found. Broadcasting...");
view = serverRemoteObjects;
numServers = ConfigurationManager.AppSettings.AllKeys.Count();
}
else
{
numServers = view.Count;
}
WaitHandle[] handles = new WaitHandle[numServers];
IAsyncResult[] asyncResults = new IAsyncResult[numServers];
try {
for (int i = 0; i < numServers; i++)
{
IServerService remoteObject = view[i];
requestViewDelegate viewDel = new requestViewDelegate(remoteObject.ViewRequest);
IAsyncResult ar = viewDel.BeginInvoke(null, null);
asyncResults[i] = ar;
handles[i] = ar.AsyncWaitHandle;
}
int[] timeouts = new int[numServers];
if (!WaitHandle.WaitAll(handles, 1000))
{
for (int k = 0; k < numServers; k++)
{
if (handles[k].WaitOne(0) == false)
{
timeouts[k]++;
}
}
}
if (timeouts.Sum() > numServers / 2)
{
//Majority of timeouts
getView(view);
}
else
{
List <string> viewUnion = new List <string>();
int i = 0;
for (; i < numServers; i++) //dont invoke timeouts
{
if (timeouts[i] != 1)
{
try {
requestViewDelegate viewDel = (requestViewDelegate)((AsyncResult)asyncResults[i]).AsyncDelegate;
List <string> servers = viewDel.EndInvoke(asyncResults[i]);
viewUnion = union(servers, viewUnion);
}
catch (SocketException) {
List <IServerService> newView = view;
//If there is a socket exception, it is because he is down
//Therefore we remove it from view
newView.RemoveAt(i);
return(getView(newView));
}
}
}
if (viewUnion.Count() != 0)
{
List <IServerService> serverobjs = new List <IServerService>();
for (int j = 0; j < viewUnion.Count; j++)
{
serverobjs.Add((IServerService)Activator.GetObject(typeof(IServerService), viewUnion[j]));
}
return(serverobjs);
}
else
{
//View is empty, try again
return(getView(view));
}
}
}
catch (SocketException) {
Console.WriteLine("Connection error. Restarting...");
return(getView(serverRemoteObjects));
}
return(getView(serverRemoteObjects));
}
public List <IServerService> getView(List <IServerService> view)
{
int numServers;
if (view.Count == 0)
{
Console.WriteLine("No connections found. Broadcasting...");
view = serverRemoteObjects;
numServers = ConfigurationManager.AppSettings.AllKeys.Count();
}
else
{
numServers = view.Count;
}
WaitHandle[] handles = new WaitHandle[numServers];
IAsyncResult[] asyncResults = new IAsyncResult[numServers];
try {
for (int i = 0; i < numServers; i++)
{
IServerService remoteObject = view[i];
requestViewDelegate viewDel = new requestViewDelegate(remoteObject.ViewRequest);
IAsyncResult ar = viewDel.BeginInvoke(null, null);
asyncResults[i] = ar;
handles[i] = ar.AsyncWaitHandle;
}
int indxAsync = WaitHandle.WaitAny(handles, 300);
if (indxAsync == WaitHandle.WaitTimeout)
{
getView(view);
}
else
{
IAsyncResult asyncResult = asyncResults[indxAsync];
requestViewDelegate viewDel = (requestViewDelegate)((AsyncResult)asyncResult).AsyncDelegate;
try {
List <string> servers = viewDel.EndInvoke(asyncResult);
if (servers.Count() != 0)
{
List <IServerService> serverobjs = new List <IServerService>();
for (int j = 0; j < servers.Count; j++)
{
serverobjs.Add((IServerService)Activator.GetObject(typeof(IServerService), servers[j]));
}
return(serverobjs);
}
else
{
return(getView(view));
}
}
catch (SocketException) {
Console.WriteLine("ERROR: view is " + view.Count());
Console.WriteLine("Server " + indxAsync + " is down. Restarting...");
List <IServerService> newView = view;
newView.RemoveAt(indxAsync);
return(getView(newView));
}
}
}
catch (SocketException e) {
Console.WriteLine("Connection error. Restarting...");
return(getView(serverRemoteObjects));
}
return(getView(serverRemoteObjects));
}
