import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;
import java.util.ArrayList;
import java.util.HashMap;

class ChatImpl implements Chat {    

    public ChatImpl() { /* TODO */ }

    public void connect(String nick, ChatBack ref) throws RemoteException { /* TODO */ }
							  
    public void disconnect(String nick) throws RemoteException { /* TODO */ }

    public ArrayList<String> list() throws RemoteException { /* TODO */ }

    public void send(String src, String msg) throws RemoteException { /* TODO */ }

    public void send(String src, String dst, String msg) throws RemoteException { /* TODO */ }
        
}

public class ChatServer {    
    
    public static void main(String args[]) { 
	
        try {
	    Chat chat = new ChatImpl(); 
            Chat stub = (Chat) UnicastRemoteObject.exportObject(chat, 0);
            Registry registry = LocateRegistry.getRegistry();
            registry.rebind("chat", stub);

        } catch (Exception e) { 
	    System.out.println("ChatServer Exception: " + e.getMessage()); 
	    e.printStackTrace(); 
        } 

    } 
}