public void addServerToView(String serverid, String serverurl)
{
//prevent deadlock
if (!server.getView().ContainsKey(serverid))
{
lock (server)
{
Console.WriteLine("-------- BEGIN VIEW UPDATE --------");
server.updateView("add", serverid, serverurl);
Console.WriteLine("Server added: " + serverid + " @ " + serverurl);
String backupInfo = server.getBackupServer()[0];
for (int i = 1; i < server.getBackupServer().Length; i++)
{
backupInfo += ", " + server.getBackupServer()[i];
}
Console.WriteLine("New Backup-URL: " + backupInfo);
if (!server.getBackupServer().Equals(server.getURL()))
{
ServerCli bscli = (ServerCli)Activator.GetObject(typeof(ServerCli), server.getBackupServer()[0]);
bscli.addServerToView(serverid, serverurl);
}
//send command to update backup server to clients
foreach (IClient client in clientsList)
{
client.setBackupServerURL(server.getBackupServer());
}
//recreate BackupProposals
recreateBackupProposals();
Console.WriteLine("Backup server in " + clientsList.Count + " client(s) updated.");
Console.WriteLine("--------- END VIEW UPDATE ---------");
}
}
}
public void updateBackupProposals()
{
foreach (String url in server.getView().Values)
{
try
{
ServerCli bscli = (ServerCli)Activator.GetObject(typeof(ServerCli), url);
bscli.fillMPBackup();
}
catch (Exception e)
{
Console.WriteLine("Excpetion updateBackupProposals: " + e.Message + " on url: " + url);
}
}
}
public Message GetMeetingProposalURL(string mpTopic)
{
//look if the server that has the mp is this one
foreach (MeetingProposal serMP in meetingProposals)
{
if (serMP.getMPTopic().Equals(mpTopic))
{
return(new Message(true, server.getURL(), ""));
}
}
//look for the proposal on another servers
string[] backupList = server.getBackupServer();
string result = null;
foreach (string serv in backupList)
{
ServerCli bscli = null;
List <MeetingProposal> bserMPList = null;
if (!serv.Equals(server.getURL()))
{
try
{
bscli = (ServerCli)Activator.GetObject(typeof(ServerCli), serv);
bserMPList = bscli.getServerMeetingProposals();
foreach (MeetingProposal m in bserMPList)
{
if (m.getMPTopic().Equals(mpTopic))
{
result = serv;
}
}
}
catch (Exception e)
{
}
}
}
if (result == null)
{
return(new Message(false, null, "Meeting proposal not found!"));
}
else
{
return(new Message(true, result, ""));
}
}
public void recreateBackupProposals()
{
Console.WriteLine("Recreation of proposal backups started");
foreach (String url in server.getView().Values)
{
try
{
ServerCli bscli = (ServerCli)Activator.GetObject(typeof(ServerCli), url);
bscli.createNewMPBackup();
}
catch (Exception e)
{
Console.WriteLine("Excpetion recreateBackupProposals: " + e);
}
}
updateBackupProposals();
Console.WriteLine("Recreation of proposal backups finished");
}
//should be called on client-side each time an user is updated
private IClient findClient(String username)
{
IClient result = null;
//look for the client on the server
foreach (IClient ic in clientsList)
{
if (ic.getUser().getName().Equals(username))
{
result = ic;
}
}
//look for the client on the other servers
if (result == null)
{
string[] backupList = server.getBackupServer();
foreach (string servURL in backupList)
{
ServerCli bscli = null;
List <IClient> cliList = null;
if (!servURL.Equals(server.getURL()))
{
try
{
bscli = (ServerCli)Activator.GetObject(typeof(ServerCli), servURL);
cliList = bscli.getClientsList();
}
catch (Exception e)
{
}
foreach (IClient c in cliList)
{
if (c.getUser().getName().Equals(username))
{
result = c;
}
}
}
}
}
return(result);
}
public void bookRoom(MeetingRoom mr, string time)
{
lock (meetingLocations)
{
foreach (MeetingLocation ml in meetingLocations)
{
foreach (MeetingRoom room in ml.GetMeetingRooms())
{
if (room.GetName() == mr.GetName())
{
if (room.isBooked(time))
{
return;
}
else
{
room.book(time);
}
}
}
}
}
if (!server.getBackupServer().Equals(server.getURL()))
{
ServerCli bscli = null;
try
{
bscli = (ServerCli)Activator.GetObject(typeof(ServerCli), server.getBackupServer()[0]);
bscli.bookRoom(mr, time);
}
catch (Exception e)
{
Task <Message> task = Task <Message> .Factory.StartNew(() => Response("RemoveServerFromView", new List <String>()
{
bscli.getsURL()
}));
task.Wait();
}
}
}
//Get client urls from the server plus one alive from backup
public Message getSharedClientsList()
{
List <string> list = null;
List <string> auxList = null;
ServerCli bscli = null;
//get servers clients list
list = getClientsURLList();
string[] backupList = server.getBackupServer();
//find a active backup server with active clients
for (int i = 0; i < backupList.Length; i++)
{
if (!server.getBackupServer()[0].Equals(server.getURL()))
{
try
{
bscli = (ServerCli)Activator.GetObject(typeof(ServerCli), backupList[i]);
}
catch (Exception e)
{
if (i + 1 < backupList.Length)
{
bscli = (ServerCli)Activator.GetObject(typeof(ServerCli), backupList[i + 1]);
}
}
if (bscli != null)
{
//get the clients list from the found backup server
auxList = bscli.getClientsURLList();
if (auxList.Count() != 0)
{
list.Add(auxList[0]);
}
}
}
}
return(new Message(true, list, ""));
}
public Message closeRequest(string topic, string username)
{
string primary = server.getView().Values[0];
ServerCli serv = (ServerCli)Activator.GetObject(typeof(ServerCli), primary);
Message mess;// = serv.sequence(server.getURL(), topic, username);
if (!primary.Equals(server.getURL()))
{
Task <Message> task = Task <Message> .Factory.StartNew(() => serv.sequence(server.getURL(), topic, username));
bool done = task.Wait(timeout);
if (done)
{
mess = task.Result;
}
else
{
mess = new Message(false, null, "Close not successfull");
}
}
else
{
Task <Message> task = Task <Message> .Factory.StartNew(() => sequence(server.getURL(), topic, username));
bool done = task.Wait(timeout);
if (done)
{
mess = task.Result;
}
else
{
mess = new Message(false, null, "Close not successfull");
}
}
return(mess);
}
public void fillMPBackup()
{
Console.WriteLine("Update of proposal backups started");
for (int i = 0; i < server.getBackupServer().Length; i++)
{
try
{
ServerCli bscli = (ServerCli)Activator.GetObject(typeof(ServerCli), server.getBackupServer()[i]);
bscli.setMPBackup(i, meetingProposals);
}
catch (Exception e)
{
removeServerFromView(new List <String>()
{
server.getBackupServer()[i]
});
recreateBackupProposals();
fillMPBackup();
}
}
Console.WriteLine("Update of proposal backups finished");
}
public static void Main(string[] args)
{
string[] vs = args[0].Split(
new[] { "'" },
StringSplitOptions.None);
String id = vs[0];
String URL = vs[1];
int maxFaults = Int32.Parse(vs[2]);
int minDelay = Int32.Parse(vs[3]);
int maxDelay = Int32.Parse(vs[4]);
Uri myUri = new Uri(URL);
TcpChannel channel = new TcpChannel(myUri.Port);
ChannelServices.RegisterChannel(channel, false);
SchedulingServer server = new SchedulingServer(id, URL, maxFaults, minDelay, maxDelay);
ServerCli mo = new ServerCli(server);
//RemotingServices.Marshal(mo, "mcm", typeof(ServerCli));
RemotingServices.Marshal(mo, myUri.Segments[1], typeof(ServerCli));
HttpChannel channel1 = new HttpChannel(myUri.Port + 200);
ChannelServices.RegisterChannel(channel1, false);
PuppetServer ps = new PuppetServer(mo); //testing this
RemotingServices.Marshal(ps, "ps", typeof(PuppetServer)); // testing this
Console.WriteLine("Server " + id + " started on Port " + myUri.Port);
System.Console.ReadLine();
}
public PuppetServer(ServerCli sc)
{
this.sc = sc;
}
public Message removeServerFromView(List <String> serverurls)
{
foreach (String serverurl in serverurls)
{
if (server.getView().IndexOfValue(serverurl) != -1)
{
String serverid = server.getView().Keys[server.getView().IndexOfValue(serverurl)];
//prevent deadlock
if (server.getView().ContainsKey(serverid))
{
lock (server)
{
Console.WriteLine("-------- BEGIN VIEW UPDATE --------");
server.updateView("remove", serverid, serverurl);
Console.WriteLine("Server removed: " + serverid + " @ " + serverurl);
String backupInfo = server.getBackupServer()[0];
for (int i = 1; i < server.getBackupServer().Length; i++)
{
backupInfo += ", " + server.getBackupServer()[i];
}
Console.WriteLine("New Backup-URL: " + backupInfo);
if (!server.getBackupServer()[0].Equals(server.getURL()))
{
tryConnectToBackup(0, serverurls);
void tryConnectToBackup(int indexBackupUpdate, List <String> args)
{
try
{
ServerCli bscli = (ServerCli)Activator.GetObject(typeof(ServerCli), server.getBackupServer()[indexBackupUpdate]);
bscli.removeServerFromView(args);
}
catch (Exception e)
{
if (indexBackupUpdate + 1 < server.getBackupServer().Length)
{
args.Add(server.getBackupServer()[indexBackupUpdate]);
tryConnectToBackup(indexBackupUpdate + 1, args);
}
else
{
Console.WriteLine("Error: No Backup-server reachable!");
}
}
}
}
//send command to update backup server to clients
foreach (IClient client in clientsList)
{
client.setBackupServerURL(server.getBackupServer());
}
Console.WriteLine("Backup server in " + clientsList.Count + " client(s) updated.");
Console.WriteLine("--------- END VIEW UPDATE ---------");
}
}
}
}
for (int i = 0; i < serverurls.Count; i++)
{
meetingProposals.AddRange(meetingProposalsBackup[i]);
}
return(new Message(true, null, ""));
}
public Message sequence(string url, string topic, string username)
{
Message mess = null;
if (!closes.ContainsValue(url + " " + topic + " " + username))
{
seq++;
closes.Add(seq, url + " " + topic + " " + username);
Monitor.Enter(server); //lock
try
{
closes.TryGetValue(request, out string str);
string[] data = str.Split(' ');
if (!data[0].Equals(server.getURL()))
{
ServerCli serv = (ServerCli)Activator.GetObject(typeof(ServerCli), data[0]);
Task <Message> task = Task <Message> .Factory.StartNew(() => serv.CloseMeetingProposal(data[1], data[2]));
bool done = task.Wait(timeout);
if (done)
{
mess = task.Result;
}
else
{
mess = new Message(false, null, "Server to close timed out abort operation");
}
}
else
{
Task <Message> task = Task <Message> .Factory.StartNew(() => CloseMeetingProposal(data[1], data[2]));
bool done = task.Wait(timeout);
if (done)
{
mess = task.Result;
}
else
{
mess = new Message(false, null, "Server to close timed out abort operation");
}
}
request++;
}
finally
{
Monitor.Pulse(server);
Monitor.Exit(server);
}
}
else
{
mess = new Message(false, null, "Duplicated request");
}
return(mess);
}
