package rmiServer;

import java.rmi.AlreadyBoundException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;

import rmi.Hello;

/**
 * Server for RMI Hello
 *
 * @author Bryan Higgs
 * @version 1.0
 */
public class HelloServer implements Hello
{
  public String sayHello() throws RemoteException
  {
    return "Hello, RMI world!";
  }
  
  /**
   * Main entry point for server
   * @param args the command line arguments
   *             args[0] contains the port number for the registry
   */
  public static void main(String[] args)
  {
    // Determine the port number
    int port = 1099;  // the default port number for the registry
    if (args.length > 0)
    {
      try
      {
        port = Integer.parseInt(args[0]);
      }
      catch (NumberFormatException nfe)
      {
        System.err.println("Port number " + args[1] + " invalid");
        return;
      }
    }
        
    try
    {
      // Create the object that provides the service
      HelloServer object = new HelloServer();
      // Export the remote object to the Java RMI runtime
      Hello stub = (Hello) UnicastRemoteObject.exportObject(object, 0);
      
      // Bind the remote object's stub in the RMI registry
      Registry registry = LocateRegistry.getRegistry(port);
      registry.bind("Hello", stub);
      
      System.err.println("Server ready...");
    }
    catch (AlreadyBoundException abe)
    {
      // The attempt to bind failed, because it's already bound
      abe.printStackTrace();
    }
    catch (RemoteException re)
    {
      re.printStackTrace();
    }
  }
}