public void updateClientState()
{
try
{
Task <Message> task = null;
try
{
task = Task <Message> .Factory.StartNew(() => server.Response("GetSharedClientsList", null));
}
catch (Exception e)
{
if (connectToBackup(0, new List <string>()))
{
task = Task <Message> .Factory.StartNew(() => server.Response("GetSharedClientsList", null));
}
return;
}
bool taskCompleted = task.Wait(timeout);
if (taskCompleted)
{
Message mess = task.Result;
if (mess.getSucess())
{
List <string> urls = (List <string>)mess.getObj();
ClientServ c = null;
int index = 0;
try{
c = (ClientServ)Activator.GetObject(typeof(ClientServ), urls[index]);
} catch (Exception e) {
c = (ClientServ)Activator.GetObject(typeof(ClientServ), urls[index + 1]);
}
List <MeetingProposal> update = c.getMeetingProposals();
if (update == null || update.Count == 0)
{
Console.WriteLine("Client doesn't have anything to update");
}
else
{
foreach (MeetingProposal m in update)
{
cs.getUser().addMyMP(m);
}
Console.WriteLine("Client updated");
}
}
}
} catch (Exception e) {
Console.WriteLine("Unable to connect to the server");
}
}
static void Main(string[] args)
{
TcpChannel channel;
Cliente cli;
String script = "";
if (args.Length == 2)
{
script = args[1];
}
string[] vs = args[0].Split(
new[] { "'" },
StringSplitOptions.None);
String username = vs[0];
String cURL = vs[1];
String sURL = vs[2];
String[] sURLBackup;
List <String> localClients = new List <String>();
cli = new Cliente(username, cURL, sURL, script);
Uri myUri = new Uri(cURL);
channel = new TcpChannel(myUri.Port);
ChannelServices.RegisterChannel(channel, false);
cs = new ClientServ(cli);
//RemotingServices.Marshal(cs, "cc", typeof(ClientServ));
RemotingServices.Marshal(cs, myUri.Segments[1], typeof(ClientServ));
server = (ISchedulingServer)Activator.GetObject(typeof(ISchedulingServer), sURL);
List <String> arg = new List <String>();
arg.Add(cURL);
Message mess = null; // = server.Response("Register", arg); //it should wait but it should be a task!
try
{
Task <Message> task = Task <Message> .Factory.StartNew(() => server.Response("Register", arg));
task.Wait();
mess = task.Result;
}
catch (Exception e)
{
//Should we give here another server for the Client to connect?
Console.WriteLine("The server you tried to connect unfortunately is not available");
Console.WriteLine("Please close window and try to connect to another server adress");
Console.ReadLine();
}
sURLBackup = Array.ConvertAll((object[])mess.getObj(), Convert.ToString);
cs.setBackupServerURL(sURLBackup);
cs.setLocalClients(localClients);
Console.WriteLine("Cliente " + new Uri(cURL).Port + " (" + username + ") " + mess.getMessage());
//check if the client has to be updated
cs.updateClientState();
if (args.Length == 1 || args.Length == 2)
{
Boolean run = true;
Console.WriteLine("Hello, " + username + ". Welcome to MSDAD");
Console.WriteLine("Type list to list the user's meeting proposals");
Console.WriteLine("Type create <topic> <# of min participants> <# of slots> <# of invitees> [slots] [invitees] to create a new meeting proposal");
Console.WriteLine("Type join <meetingTopic> <# of slots> [slots] to join the specific meeting");
Console.WriteLine("Type close <meetingTopic> to close the specific meeting proposal");
Console.WriteLine("Type wait <time in milliseconds> to let the Cliente wait");
Console.WriteLine("Type quit to exit");
//if script client
if (args.Length == 2)
{
string allScript = System.IO.File.ReadAllText(script);
string[] commandList = allScript.Split(
new[] { Environment.NewLine },
StringSplitOptions.None);
Console.WriteLine("If you wish the script to be run stpe-by-step write YES");
String s = Console.ReadLine();
if (s.ToLower().Equals("yes"))
{
foreach (string command in commandList)
{
Console.WriteLine("Press Enter to execute the line:");
Console.WriteLine(command);
Console.ReadLine();
cli.ProcessConsoleLine(command);
}
}
else
{
foreach (string command in commandList)
{
cli.ProcessConsoleLine(command);
}
}
}
else
{
while (run)
{
Console.Write("Insert command: ");
string command = Console.ReadLine();
if (command.Split(
new[] { " " }, StringSplitOptions.None)[0].Equals("quit"))
{
System.Environment.Exit(1);
}
else
{
cli.ProcessConsoleLine(command);
}
}
}
}
else
{
System.Console.WriteLine("ERROR: Wrong number of arguments!");
}
}
//TODO we have to make all calls to the server fail proof, both from freezes and crashes
public Boolean connectToBackup(int index, List <String> args)
{
Boolean _return = true;
Console.WriteLine("Connection to Server lost. Trying to reconnect...");
try
{
args.Add(sURL);
this.sURL = sURLBackup[index];
server = (ISchedulingServer)Activator.GetObject(typeof(ISchedulingServer), sURLBackup[index]);
//server.Response("RemoveServerFromView", args).getMessage();
Task <Message> task = Task <Message> .Factory.StartNew(() => server.Response("RemoveServerFromView", args));
task.Wait();
List <String> arg = new List <String>();
arg.Add(cURL);
Message mess; // = server.Response("Register", arg);
task = Task <Message> .Factory.StartNew(() => server.Response("Register", arg)); // should we send an error here ?
task.Wait();
mess = task.Result;
sURLBackup = Array.ConvertAll((object[])mess.getObj(), Convert.ToString);
Console.WriteLine("Cliente " + new Uri(cURL).Port + " (" + username + ") " + mess.getMessage());
//coordinate local clients to reconnect to different backup servers
int pointer = index + 1 % sURLBackup.Length;
foreach (string url in localClients)
{
if (url != cURL)
{
ClientServ c = (ClientServ)Activator.GetObject(typeof(ClientServ), url);
c.connectToBackup(pointer % sURLBackup.Length, new List <String>());
pointer++;
}
}
_return = true;
}
catch (Exception e)
{
Console.WriteLine(e);
try
{
if (index + 1 < sURLBackup.Length)
{
connectToBackup(index + 1, args);
}
else
{
Console.WriteLine("Error: No Backup-server reachable!");
_return = false;
}
}
catch (Exception e2)
{
_return = false;
}
}
return(_return);
}
// this can be to share the proposal we created or the redirect a received proposal
public void ShareProposal(MeetingProposal mp, List <string> urls, string serv)
{
//update the list of clients from the server when the call didn't came from a client on
//the same server
if (!serv.Equals(this.sURL))
{
try
{
Task <Message> task = null;
try
{
task = Task <Message> .Factory.StartNew(() => server.Response("GetSharedClientsList", null));
}
catch (Exception e)
{
if (connectToBackup(0, new List <string>()))
{
task = Task <Message> .Factory.StartNew(() => server.Response("GetSharedClientsList", null));
}
return;
}
bool taskCompleted = task.Wait(timeout);
if (taskCompleted)
{
Message output = task.Result;
//get the list for the new gossip group
urls = (List <string>)output.getObj();
//update the server identifier
serv = this.sURL;
//remove the client url from that list
urls.Remove(cURL);
}
} catch (Exception e) {
Console.WriteLine("Connection to server failed");
}
}
if (serv.Equals(this.sURL) && urls.Count == 0)
{
//terminal condition
}
else if (urls.Count < gossipParam)
{
//when we have less than gossipParam clients to share
foreach (string u in urls)
{
ClientServ c = (ClientServ)Activator.GetObject(typeof(ClientServ), u);
c.receiveProposal(mp, new List <string>(), serv);
}
}
else
{
//when we have more than gossipParam clients to share
List <string> myURLs = new List <string>();
List <string> removeList = new List <string>();
for (int w = 0; w < gossipParam; w++)
{
removeList.Add(urls[w]);
}
foreach (string rmv in removeList)
{
myURLs.Add(rmv);
urls.Remove(rmv);
}
//divide the list and create a new one for each client
//given by the gossipParam
int standardSize = urls.Count / gossipParam;
int rest = urls.Count % gossipParam;
List <string>[] otherURLs = new List <string> [gossipParam];
for (int init = 0; init < otherURLs.Length; init++)
{
otherURLs[init] = new List <string>();
}
int counter = 0;
//first distribute the client urls giving standardSize urls
//to each one
for (int i = 0; i < otherURLs.Length; i++)
{
for (int j = 0; j < standardSize; j++)
{
otherURLs[i].Add(urls[j + counter]);
}
counter += standardSize;
}
//if there is any urls left to distribute, do it, by giving one
//to each list
for (int i = 0; i < otherURLs.Length && rest > 0; i++)
{
otherURLs[i].Add(urls[i + counter]);
rest--;
}
//propagate the meeting proposals
for (int i = 0; i < myURLs.Count; i++)
{
//prevent sending to itself
if (myURLs[i] != cURL)
{
ClientServ c = (ClientServ)Activator.GetObject(typeof(ClientServ), myURLs[i]);
if (c != null)
{
c.receiveProposal(mp, otherURLs[i], serv);
}
}
}
}
}