public int execute(JoinCommand command)
{
// delay
this.delay();
if (this.isFrozen)
{
this.frozenCommands.Add(command);
while (true)
{
// freeze
}
return(0);
}
else
{
Console.WriteLine("Recieved " + command.getType() + "-" +
command.getSequenceNumber() + " command from " + command.getIssuerId());
MeetingProposal meeting = this.getMeetingByTopic(command.getTopic());
if (meeting == null)
{
Console.WriteLine("Meeting {0} not found, Contacting other servers ...", command.getTopic());
meeting = this.restoreLostMeeting(command.getTopic());
// Console.WriteLine("Meeting {0} not found, Waiting ...");
// Thread.Sleep(2000);
if (meeting == null)
{
Console.WriteLine("Meeting {0} not found", command.getTopic());
return(0);
}
}
if (meeting.isClosed() || meeting.isCancelled())
{
// a client can join a closed meeting if it was joined before the closing momment
if (command.getTimestamp().CompareTo(meeting.getClosingTimestamp()) < 0)
{
meeting.open();
this.joinMeeting(command.getIssuerId(), meeting, command.getDesiredSlots());
meeting.close();
}
}
else
{
this.joinMeeting(command.getIssuerId(), meeting, command.getDesiredSlots());
}
this.informOtherServers(command);
return(1);
}
}
public void unfreeze()
{
Console.WriteLine("Unfreeze");
this.isFrozen = false;
// avoid executing repeated commands
SortedSet <Command> executedCommands = new SortedSet <Command>();
for (int i = 0; i < this.frozenCommands.Count; i++)
{
Command command = this.frozenCommands[i];
if (executedCommands.Contains(command))
{
Console.WriteLine(command.commandId() + " is duplicated, will not be executed");
continue;
}
if (command.getType() == "CREATE")
{
CreateCommand c = (CreateCommand)command;
this.execute(c);
}
else if (command.getType() == "LIST")
{
ListCommand c = (ListCommand)command;
this.execute(c);
}
else if (command.getType() == "CLOSE")
{
CloseCommand c = (CloseCommand)command;
this.execute(c);
}
else if (command.getType() == "JOIN")
{
JoinCommand c = (JoinCommand)command;
this.execute(c);
}
else if (command.getType() == "WAIT")
{
WaitCommand c = (WaitCommand)command;
this.execute(c);
}
executedCommands.Add(command);
}
this.frozenCommands = new List <Command>();
}
static void Main(string[] args)
{
try
{
// Client Information
string username = args[0];
string client_url = args[1];
string server_url = args[2];
// Start Connection
Regex r = new Regex(@"^(?<protocol>\w+)://[^/]+?:(?<port>\d+)?/",
RegexOptions.None, TimeSpan.FromMilliseconds(100));
Match m = r.Match(client_url);
int port = Int32.Parse(m.Result("${port}"));
BinaryServerFormatterSinkProvider provider = new BinaryServerFormatterSinkProvider();
IDictionary props = new Hashtable();
props["port"] = port;
props["timeout"] = 5000; // in milliseconds
TcpChannel channel = new TcpChannel(props, null, provider);
//TcpChannel channel = new TcpChannel(port);
ClientObject client = new ClientObject();
client.setUsername(username);
client.setUrl(client_url);
client.setPreferedServerUrl(server_url);
RemotingServices.Marshal(client, "ClientObject", typeof(ClientObject));
ChannelServices.RegisterChannel(channel, false);
// Read Commands
int sequeneNumber = 0;
InstructsParser parser = new InstructsParser();
string clientScript = args[3];
string[] lines = File.ReadAllLines(clientScript);
foreach (string line in lines)
{
if (args.Length == 5)
{
Console.WriteLine("Press any key to execute next step: " + line);
Console.ReadLine();
}
ServerInterface server = client.getServer(server_url);
if (server == null)
{
Console.WriteLine("Server is unreachable");
return;
}
server.addClient(client_url);
char[] delimiter = { ' ' };
string[] instructionParts = line.Split(delimiter, StringSplitOptions.RemoveEmptyEntries);
string myId = username + "-" + client_url;
if (instructionParts[0] == "create")
{
CreateCommand command = parser.parseCreateCommand(instructionParts, myId);
command.setIssuerId(myId);
command.setSentByClient(true);
command.setSequenceNumber(sequeneNumber);
command.setTimestamp(DateTime.Now);
sequeneNumber++;
Console.WriteLine(command.getType() + " - " + command.getSequenceNumber());
int res = -1;
while (res == -1)
{
try
{
res = server.execute(command);
}
catch (System.Net.Sockets.SocketException)
{
Console.WriteLine("Timeout: server " + client.getPreferedServerUrl() + " seems to be frozen, trying another server");
server = client.getServer("ANOTHER_SERVER");
}
}
Console.WriteLine("Result: {0}", res);
// gossip
List <string> clients = client.getClientsForGossip();
client.gossip(command.getMeetingProposal(), clients);
}
else if (instructionParts[0] == "list")
{
ListCommand command = parser.parseListCommand(instructionParts);
command.setIssuerId(myId);
command.setSentByClient(true);
command.setSequenceNumber(sequeneNumber);
command.setTimestamp(DateTime.Now);
sequeneNumber++; // lock it
Console.WriteLine(command.getType());
List <MeetingProposal> proposals = null;
while (proposals == null)
{
try
{
proposals = server.execute(command);
}
catch (System.Net.Sockets.SocketException)
{
Console.WriteLine("Timeout: server " + client.getPreferedServerUrl() + " seems to be frozen, trying another server");
server = client.getServer("ANOTHER_SERVER");
}
}
client.listMeetings(proposals);
}
else if (instructionParts[0] == "join")
{
JoinCommand command = parser.parseJoinCommand(instructionParts);
command.setIssuerId(myId);
command.setSentByClient(true);
command.setSequenceNumber(sequeneNumber);
command.setTimestamp(DateTime.Now);
sequeneNumber++; // lock it
Console.WriteLine(command.getType());
int res = -1;
while (res == -1)
{
try
{
res = server.execute(command);
}
catch (System.Net.Sockets.SocketException)
{
Console.WriteLine("Timeout: server " + client.getPreferedServerUrl() + " seems to be frozen, trying another server");
server = client.getServer("ANOTHER_SERVER");
}
}
Console.WriteLine("Result: {0}", res);
}
else if (instructionParts[0] == "close")
{
CloseCommand command = parser.parseCloseCommand(instructionParts);
command.setIssuerId(myId);
command.setSentByClient(true);
command.setSequenceNumber(sequeneNumber);
command.setTimestamp(DateTime.Now);
sequeneNumber++; // lock it
Console.WriteLine(command.getType());
int res = -1;
while (res == -1)
{
try
{
res = server.execute(command);
}
catch (System.Net.Sockets.SocketException)
{
Console.WriteLine("Timeout: server " + client.getPreferedServerUrl() + " seems to be frozen, trying another server");
server = client.getServer("ANOTHER_SERVER");
}
}
Console.WriteLine("Result: {0}", res);
}
else if (instructionParts[0] == "wait")
{
WaitCommand command = parser.parseWaitCommand(instructionParts);
command.setIssuerId(myId);
command.setSentByClient(true);
command.setSequenceNumber(sequeneNumber);
command.setTimestamp(DateTime.Now);
sequeneNumber++; // lock it
Console.WriteLine(command.getType());
int res = -1;
while (res == -1)
{
try
{
res = server.execute(command);
}
catch (System.Net.Sockets.SocketException)
{
Console.WriteLine("Timeout: server " + client.getPreferedServerUrl() + " seems to be frozen, trying another server");
server = client.getServer("ANOTHER_SERVER");
}
}
Console.WriteLine("Result: {0}", res);
}
else
{
NotFoundCommand command = new NotFoundCommand();
Console.WriteLine(command.getType());
}
}
Console.ReadLine();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
Console.WriteLine(e.ToString());
Console.WriteLine(e.StackTrace);
// diagnostic: to see the error before exiting
System.Threading.Thread.Sleep(60000);
}
}