package rmiClient;

import java.rmi.NotBoundException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

import rmi.Hello;

/**
 * Client for Hello RMI server.
 *
 * @author Bryan Higgs
 * @version 1.0
 */
public class HelloClient
{
  /**
   * Main entry point for client
   * @param args the command line arguments
   *             args[0] contains the server hostname
   *             args[1] contains the port number for the registry
   */
  public static void main(String[] args)
  {
    // Determine server hostname
    String host = null;
    if (args.length > 0)
      host = args[0];
    
    // Determine the port number
    int port = 1099;  // the default port number for the registry
    if (args.length > 1)
    {
      try
      {
        port = Integer.parseInt(args[1]);
      }
      catch (NumberFormatException nfe)
      {
        System.err.println("Port number " + args[1] + " invalid");
        return;
      }
    }
    
    try
    {
      // Find the RMI registry
      Registry registry = LocateRegistry.getRegistry(host, port);
      // Look up the server
      Hello stub = (Hello) registry.lookup("Hello");
      
      // Call the server at the sayHello entry point.
      String response = stub.sayHello();
      System.out.println("Response: " + response);
    }
    catch (NotBoundException nbe)
    {
      nbe.printStackTrace();
    }
    catch (RemoteException re)
    {
      re.printStackTrace();
    }
  }
  
  /**
   * Creates a new instance of HelloClient
   * (Make private to disable constructor)
   */
  public HelloClient()
  {
  }
}