Distributed Systems tutorial 4



Implementation of remote method invocation
(RMI)

RemoteInterface.java
import java.rmi.*;
public interface RemoteInterface extends Remote
{
  public int add(int x,int y)throws Exception;
}
ServerImplements.java
import java.rmi.*;
import java.rmi.server.*;
import java.lang.String;
interface RemoteInterface extends Remote {
  public int add(int x, int y) throws Exception;
}
public class ServerImplements extends UnicastRemoteObject implements
RemoteInterface {
  public ServerImplements() throws Exception {
  super();
  }
  public int add(int x, int y) {
  return (x + y);
  }
}
Server.java
import java.rmi.*;
import java.net.*;
public class Server {
  public static void main(String args[]) {
  try {
  ServerImplements s = new ServerImplements();
  Naming.rebind("RMIAPPLICATION", s);
  System.out.println("Server has been started");
  } catch (Exception e) {
  System.out.println(e.getMessage());
  }
  }
}
Client.java
import java.rmi.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class Client extends JFrame {
  TextField t1 = new TextField(30);
  TextField t2 = new TextField(30);
  Label rs = new Label("Sum= 0");
  JButton b = new JButton("Add");
  Panel p = new Panel(new GridLayout(4, 1, 5, 5));
  RemoteInterface s;
  public Client() {
  super("Client Side");
  setSize(250, 250);
  setLocation(300, 300);
  getContentPane().add(p, "North");
  p.add(t1);
  p.add(t2);
  p.add(rs);
  p.add(b);
  try {
  String ipp = JOptionPane
  .showInputDialog("Please enter the IP Address to Connect");
  String ip = "rmi://" + ipp + "/RMIAPPLICATION";
  s = (RemoteInterface) Naming.lookup(ip);
  } catch (Exception exp) {
  JOptionPane.showMessageDialog(null, exp.getMessage());
  }
  b.addActionListener(new ActionListener() {
  public void actionPerformed(ActionEvent evt) {
  int a = Integer.parseInt(t1.getText());
  int b = Integer.parseInt(t2.getText());
  try {
  int r = s.add(a, b);
  rs.setText("Sum of two no =" + r);
  } catch (Exception epx) {
  }
  }
  });
  }
  public static void main(String args[]) {
  Client c = new Client();
  c.setDefaultCloseOperation(EXIT_ON_CLOSE);
  c.setVisible(true);
  }
}

Steps for execution:
Step-1
javac RemoteInterface.java
javac ServerImplements.java
Step-2
rmic ServerImplements
This steps create Stub/ Skeleton
Step-3
javac Server.java
jvac Client.javaa
Step-4
Open Two More Consoles. by writing 'start' twice.
Step-5
On first console
rmiregistry
Step-6
On second console
java Server
Step-7
On third console
java Client


Output:-







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