Irc.java

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package irc;

/***
 * Irc class : simple implementation of a chat using JAVANAISE
 *
 * @author Fabienne BOYER,
 * @author Lionel DEBROUX, http://lionel.debroux.free.fr
 * @author Savas Ali TOKMEN, http://ali.tokmen.com
 */

import java.awt.*;
import java.awt.event.*;

import jvn.*;


public class Irc {
        protected TextArea text;
        protected TextField data;
        protected JvnObject sentence;

        public static void main(String argv[]) {
                try {
                        // initialize JVN
                        JvnServerImpl js = JvnServerImpl.jvnGetServer();

                        if (js == null) {
                                System.out.println("IRC problem : cannot create server!");
                        }
                        else {
                                // look up the IRC object in the JVN server
                                // if not found, create it, and register it in the JVN server
                                JvnObject jo = js.jvnLookupObject("IRC",JvnObject.class);
                                if (jo == null) {
                                        jo = js.jvnCreateObject(new Sentence());
                                        // after creation, I have a write lock on the object
                                        jo.jvnUnLock();
                                        js.jvnRegisterObject("IRC", jo);
                                }
                                // create the graphical part of the Chat application
                                new Irc(jo);
                        }
                } catch (JvnException je) {
                        System.out.println("IRC problem : " + je.getMessage());
                }
        }

        public Irc(JvnObject jo) {
                // Create frame
                sentence = jo;
                Frame frame=new Frame("Javanaise Client: IRC");
                frame.addWindowListener(new WindowAdapter() {
                        public void windowClosing(WindowEvent e) {
                                e.getWindow().dispose();
                                try {
                                        JvnServerImpl.jvnGetServer().jvnTerminate();
                                } catch (JvnException je) {}
                                System.exit(0);
                        }
                });
                frame.setLayout(new BorderLayout(1,1));

                // Create and add texts
                Panel texts = new Panel(new GridLayout(1,1));
                text=new TextArea(10,60);
                text.setEditable(false);
                text.setForeground(Color.red);
                text.setBackground(Color.black);
                texts.add(text);
                data=new TextField(40);
                texts.add(data);

                // Create and add buttons
                Panel buttons = new Panel(new GridLayout(1,1));
                Button read_and_unlock_button = new Button("Read + unlock");
                read_and_unlock_button.addActionListener(new ButtonListenerJvn1(this, ButtonType.ReadAndUnlock));
                buttons.add(read_and_unlock_button);
                Button read_button = new Button("Read");
                read_button.addActionListener(new ButtonListenerJvn1(this, ButtonType.Read));
                buttons.add(read_button);
                Button unlock_button = new Button("Unlock");
                unlock_button.addActionListener(new ButtonListenerJvn1(this, ButtonType.Unlock));
                buttons.add(unlock_button);
                Button write_button = new Button("Write");
                write_button.addActionListener(new ButtonListenerJvn1(this, ButtonType.Write));
                buttons.add(write_button);
                Button write_and_unlock_button = new Button("Write + unlock");
                write_and_unlock_button.addActionListener(new ButtonListenerJvn1(this, ButtonType.WriteAndUnlock));
                buttons.add(write_and_unlock_button);

                // Add texts + buttons and display frame
                frame.add(texts, BorderLayout.CENTER);
                frame.add(buttons, BorderLayout.SOUTH);
                frame.setSize(500,200);
                frame.setVisible(true);
        }
}


class ButtonListenerJvn1 implements ActionListener {
        Irc irc;
        ButtonType button;

        public ButtonListenerJvn1 (Irc i, ButtonType b) {
                irc = i;
                button = b;
        }

        public void actionPerformed (ActionEvent e) {
                (new ButtonThreadJvn1(irc, button)).start();
        }
}

class ButtonThreadJvn1 extends Thread {
        private Irc irc;
        private ButtonType button;

        ButtonThreadJvn1( Irc i, ButtonType b ) {
                irc = i;
                button = b;
        }

        public void run() {
                try {
                        if( button == ButtonType.Read || button == ButtonType.ReadAndUnlock ) {
                                // lock the object in read mode
                                irc.sentence.jvnLockRead();

                                // invoke the method
                                String s = ((Sentence)(irc.sentence.jvnGetObjectState())).read();

                                // display the read value
                                irc.data.setText(s);
                                irc.text.append(s+"\n");

                                if( button == ButtonType.ReadAndUnlock ) {
                                        // unlock the object
                                        irc.sentence.jvnUnLock();
                                }
                        } else if( button == ButtonType.Unlock ) {
                                // unlock the object
                                irc.sentence.jvnUnLock();
                        } else if( button == ButtonType.Write || button == ButtonType.WriteAndUnlock ) {
                                // get the value to be written from the buffer
                                String s = irc.data.getText();

                                // lock the object in write mode
                                irc.sentence.jvnLockWrite();

                                // invoke the method
                                ((Sentence)(irc.sentence.jvnGetObjectState())).write(s);

                                if( button == ButtonType.WriteAndUnlock ) {
                                        // unlock the object
                                        irc.sentence.jvnUnLock();
                                }
                        }
                } catch (JvnException je) {
                        System.out.println("Javanaise error while processing IRC button action: " + je.getMessage());
                } catch( Exception e ) {
                        System.out.println( "Error while processing IRC button action: "+e);
                }
        }
}

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