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5.8

I need to describe the concurrency control following the code design. This is basically two classes. They refer to communication of several agents and a broker in distributed system

Asked by ci04ddi in Java Programming Language

Tags: new, closing, error

Would you be able to help. There are mainly two classes involved in concurrency. Broker and Agent. This is the code:

Agent Class

public class Agent extends JFrame implements Runnable, ActionListener, KeyListener, ListSelectionListener {
    private JTextArea output;
    private JTextArea input;
    private JButton bAccept;
    private JButton bGetList;
    private JButton bClose;
    private final static int INPUT_HEIGHT = 100;
    private final static int AGENT_HEIGHT = 400;
    private final static int AGENT_WIDTH = 300;
    private String username;
    private final static String SERVER_HOST = "127.0.0.1";
    private final static int SERVER_PORT = 8989;
    private final static int CLIENT_PORT = 8980;
    private int portListening;
    private ServerSocket server; // To accept other agents connection
    private int currentStatus;

    private JFrame pop = new JFrame("User List");
    private JTable table;
    private Thread thread;
    private Reader reader;
    private String usernameDest;
    private ObjectInputStream in;
    private ObjectOutputStream out;

    private JScrollPane scrollUpper;

    public static void main(String[] args) {
        Agent agent = new Agent();
    }

    public Agent() {
        super();
        reader = new Reader();
        username = JOptionPane.showInputDialog("Please enter your username: ");
        this.setTitle(username);
        output = new JTextArea();
        output.setLineWrap(true);
        output.setWrapStyleWord(true);
        input = new JTextArea("");
        input.setLineWrap(true);
        input.setWrapStyleWord(true);
        bGetList = new JButton("Get Users");
        bGetList.addActionListener(this);
        bClose = new JButton("Close Connection");
        bClose.addActionListener(this);
        bAccept = new JButton("Send");
        bAccept.addActionListener(this);
        getContentPane().setLayout(new BorderLayout());


        JPanel lowerPanel = new JPanel(new BorderLayout());
        lowerPanel.setBorder(new LineBorder(Color.black));
        input.addKeyListener(this);
        JScrollPane scrollLower = new JScrollPane(input);
        lowerPanel.add(scrollLower, BorderLayout.CENTER);
        lowerPanel.add(bAccept, BorderLayout.EAST);
        lowerPanel.add(bGetList, BorderLayout.SOUTH);

        /* Upper panel */
        JPanel upperPanel = new JPanel(new FlowLayout());
        upperPanel.setBorder(new LineBorder(Color.black));
        upperPanel.add(bGetList);
        upperPanel.add(bClose);
        /* Center panel */
        JPanel centerPanel = new JPanel(new BorderLayout());
        scrollUpper = new JScrollPane(output);
        centerPanel.add(scrollUpper, BorderLayout.CENTER);

        setSize(AGENT_WIDTH, AGENT_HEIGHT);
        lowerPanel.setPreferredSize(new Dimension(this.getWidth(), INPUT_HEIGHT));
        lowerPanel.setMaximumSize(new Dimension(this.getWidth(), INPUT_HEIGHT));


        getContentPane().add(lowerPanel, BorderLayout.SOUTH);
        getContentPane().add(centerPanel, BorderLayout.CENTER);
        getContentPane().add(upperPanel, BorderLayout.NORTH);

        if (thread == null) {
            thread = new Thread(this);
            thread.start();
        }
    }


    private boolean updateBroker() {
        try {
            Socket s = new Socket(SERVER_HOST, SERVER_PORT);
            TreeMap data = new TreeMap();
            data.put(Message.KEY_USERNAME, username);
            InetAddress thisIp = InetAddress.getLocalHost();
            String strIP = thisIp.getHostAddress();
            data.put(Message.KEY_HOST, strIP);
            data.put(Message.KEY_PORT, new Integer(portListening));
            data.put(Message.KEY_AGENT_STATUS, new Integer(currentStatus));
            Message loginMessage = new Message(Message.CMD_AGENT_UPATE, data);
            ObjectOutputStream out = new ObjectOutputStream(s.getOutputStream());

            System.out.println("Sending registering with broker message");
            out.writeObject(loginMessage);
            System.out.println("Receiving registering response from broker");

            ObjectInputStream in = new ObjectInputStream(s.getInputStream());
            System.out.println("received");
            Message response = (Message) in.readObject();
            Integer loginResult = (Integer) response.getData().get(Message.KEY_CMD_RESULT);
            System.out.println("Result: " + loginResult.intValue());
            if (loginResult.intValue() != Codes.RESULT_SUCCESSFULL.intValue()) {
                JOptionPane.showMessageDialog(null, "Error updating client data");
                return false;
            }
            return true;
        } catch (IOException e) {
            JOptionPane.showMessageDialog(null, "Error registering with server");
        } catch (ClassNotFoundException e) {
            JOptionPane.showMessageDialog(null, "Error registering with server");
        }
        return true;
    }


    private boolean processConnect(String ip, int port, String username) {
        try {
            Socket s = new Socket(ip, port);
            TreeMap data = new TreeMap();
            data.put(Message.KEY_USERNAME, this.username);
            Message connectMessage = new Message(Message.CMD_CONNECT, data);
            out = new ObjectOutputStream(s.getOutputStream());

            System.out.println("Connecting with agent ip: " + ip + " port: " + port);
            out.writeObject(connectMessage);
            System.out.println("");

            in = new ObjectInputStream(s.getInputStream());
            System.out.println("Received connection response");
            Message response = (Message) in.readObject();
            Integer cmdResult = (Integer) response.getData().get(Message.KEY_CMD_RESULT);
            if (cmdResult.intValue() != Codes.RESULT_SUCCESSFULL.intValue()) {
                JOptionPane.showMessageDialog(null, "Error in connect");
                return false;
            }
            usernameDest = username;
            setTitle(this.username + " talking with " + usernameDest);
            reader.start();


            currentStatus = AgentData.STATUS_ON_SESSION;
            updateBroker();
            return true;

        } catch (IOException e) {
            JOptionPane.showMessageDialog(null, "Error registering with server");
        } catch (ClassNotFoundException e) {
            JOptionPane.showMessageDialog(null, "Error registering with server");
        }
        return true;
    }

    private boolean getUserList() {
        try {
            Socket s = new Socket(SERVER_HOST, SERVER_PORT);
            TreeMap data = new TreeMap();
            Message loginMessage = new Message(Message.CMD_GET_USERLIST, data);
            ObjectOutputStream out = new ObjectOutputStream(s.getOutputStream());

            System.out.println("sending");
            out.writeObject(loginMessage);
            System.out.println("receiving");

            ObjectInputStream in = new ObjectInputStream(s.getInputStream());
            System.out.println("received");
            Message response = (Message) in.readObject();
            Integer cmdResult = (Integer) response.getData().get(Message.KEY_CMD_RESULT);
            ArrayList userList = (ArrayList) response.getData().get(Message.KEY_USER_LIST);
            System.out.println("Result: " + cmdResult.intValue());
            if (cmdResult.intValue() != Codes.RESULT_SUCCESSFULL.intValue()) {
                JOptionPane.showMessageDialog(null, "Error in GET USER LIST");
                return false;
            }
            String columnNames[] = {"Username", "Status", "IP Address", "Port"};
            String sdata[][] = new String[userList.size()][4];
            for (int i = 0; i < userList.size(); i++) {
                AgentData d = (AgentData) userList.get(i);
                sdata[i][0] = d.getUsername();
                sdata[i][1] = Integer.toString(d.getStatus());
                sdata[i][2] = d.getHostname();
                sdata[i][3] = Integer.toString(d.getPort());
                System.out.println("Username : " + d.getUsername());
                System.out.println("Status : " + d.getStatus());
            }
            pop = new JFrame("Broker's User List");
            DefaultTableModel model = new DefaultTableModel(sdata, columnNames);
            table = new JTable(model);
            JScrollPane scroll = new JScrollPane(table);
            table.getSelectionModel().addListSelectionListener(this);
            pop.setSize(400, 400);
            pop.getContentPane().add(scroll);
            pop.setVisible(true);
            return true;
        } catch (IOException e) {
            JOptionPane.showMessageDialog(null, "Error registering with server");
        } catch (ClassNotFoundException e) {
            JOptionPane.showMessageDialog(null, "Error registering with server");
        }
        return true;
    }


    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == bGetList) { // Get list button was pressed
            getUserList();
        }

        if (e.getSource() == bAccept) { // Accept butotn was pressed
            sendMessage();
        }

        if (e.getSource() == bClose) { // Close connection button was pressed
            if (currentStatus == AgentData.STATUS_AVAILABLE) {
                JOptionPane.showMessageDialog(null, "You are not on session");
                return;
            }
            String confirm = JOptionPane.showInputDialog("Are you sure you want to close connection with " + usernameDest + " ? (Y/N): ");
            if (confirm.equalsIgnoreCase("Y")) {
                closeConnection();
            }
        }
    }

    private void sendMessage() {
        TreeMap data = new TreeMap();
        data.put(Message.KEY_TEXT, input.getText());
        Message txtMessage = new Message(Message.CMD_TEXT_MESSAGE, data);
        try {
            out.writeObject(txtMessage);
            input.setText("");
        } catch (IOException e1) {
            System.out.println("Error reading message");
        }
    }

    private void closeConnection() {
        TreeMap data = new TreeMap();
        Message txtMessage = new Message(Message.CMD_CLOSE_CONNECTION, data);
        try {
            out.writeObject(txtMessage);
            reader = new Reader();
            out.close();
            in.close();
            setTitle(username);
            currentStatus = AgentData.STATUS_AVAILABLE;
            updateBroker();
        } catch (IOException e1) {
            System.out.println("Error reading message");
        }
    }

    public void keyTyped(KeyEvent e) {
    }

    public void keyPressed(KeyEvent e) {
    }

    public void keyReleased(KeyEvent e) {

        if (e.getSource() == input) { // Handle key events in the input text area
            if (e.getKeyCode() == 10) { // Enter was pressed
                sendMessage();
            }
        }
    }

    public void valueChanged(ListSelectionEvent e) {

        if ((ListSelectionModel) e.getSource() == table.getSelectionModel()) { // Connection
            if (e.getValueIsAdjusting()) return;
            ListSelectionModel lsm = (ListSelectionModel) e.getSource();
            if (lsm.isSelectionEmpty()) {
                /* nothing selected */
            } else {
                int selectedRow = lsm.getMinSelectionIndex();
                int status = Integer.parseInt((String) table.getModel().getValueAt(selectedRow, 1));
                if (status == AgentData.STATUS_AVAILABLE) {
                    String username = (String) table.getModel().getValueAt(selectedRow, 0);
                    if (!username.equalsIgnoreCase(this.username)) {
                        String ip = (String) table.getModel().getValueAt(selectedRow, 2);
                        int port = Integer.parseInt((String) table.getModel().getValueAt(selectedRow, 3));
                        pop.setVisible(false);
                        processConnect(ip, port, username);
                    } else {
                        JOptionPane.showMessageDialog(null, "Sorry you can connect to your self, perhaps for the next version");
                    }
                } else {
                    JOptionPane.showMessageDialog(null, "Client is not available");
                }
            }
        }
    }

    public void run() {
        portListening = CLIENT_PORT;
        while (true) {
            try {
                System.out.println("Listening on port " + portListening);
                server = new ServerSocket(portListening);
                currentStatus = AgentData.STATUS_AVAILABLE;
                updateBroker();
                show();
                Socket s = server.accept();
                System.out.println("Connection request arrived from agent");

                currentStatus = AgentData.STATUS_ON_SESSION;
                updateBroker();

                out = new ObjectOutputStream(s.getOutputStream());
                in = new ObjectInputStream(s.getInputStream());

                Message msg = (Message) in.readObject();
                usernameDest = (String) msg.getData().get(Message.KEY_USERNAME);
                setTitle(this.username + " talking with " + usernameDest);
                TreeMap data = new TreeMap();
                data.put(Message.KEY_CMD_RESULT, Codes.RESULT_SUCCESSFULL);
                Message connectMessage = new Message(Message.CMD_CONNECT_RESPONSE, data);
                System.out.println("sending");
                out.writeObject(connectMessage);

                boolean end = false;
                while (!end) {
                    try {
                        msg = (Message) in.readObject();
                        if (msg.getCmd() == Message.CMD_CLOSE_CONNECTION) {
                            setTitle(username);
                            in.close();
                            out.close();
                            s.close();
                            end = true;
                            currentStatus = AgentData.STATUS_AVAILABLE;
                            updateBroker();
                        } else {
                            addText((String) msg.getData().get(Message.KEY_TEXT));
                        }
                    } catch (IOException e) {
                        System.out.println("Error reading 3");
                        end = true;
                    } catch (ClassNotFoundException e) {
                        System.out.println("Error reading 4");
                        end = true;
                    }
                }

            } catch (IOException e) {
                portListening++; /* Port might be used, so let's try another */
                System.out.println("Error accepting connection");
            } catch (ClassNotFoundException e) {
                System.out.println("Error accepting connection");
            }
        }
    }

    private void addText(String msg) {
        System.out.println("Adding " + msg);
        msg = usernameDest + ": " + msg;
        if (!msg.endsWith("\n")) { /* add line feed just if it does not already ends with \n */
            msg = msg + "\n";
        }
        output.append(msg);
        output.setCaretPosition(output.getDocument().getLength());    /* scroll to the end */
    }

    private class Reader extends Thread {

        public Reader() {
        }

        public void run() {
            while (true) {
                try {
                    Message msg = (Message) in.readObject();
                    addText((String) msg.getData().get(Message.KEY_TEXT));
                } catch (IOException e) {
                    System.out.println("Error reading 1");
                    break;
                } catch (ClassNotFoundException e) {
                    System.out.println("Error reading 2");
                    break;
                }
            }
            setTitle(username);
            try {
                in.close();
                out.close();
                currentStatus = AgentData.STATUS_AVAILABLE;
                updateBroker();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}


Broker Class

import javax.swing.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.TreeMap;

public class Broker extends Thread {
    private static final int BROKER_PORT = 8989;
    private ArrayList agentList;
    private ServerSocket server;

    public static void main(String[] args) {
        Broker b = new Broker();// allocate a new thread object
        b.start();// Causes this thread to begin execution
    }

    public Broker() {
        try {
            agentList = new ArrayList();
            server = new ServerSocket(BROKER_PORT);
        } catch (IOException e) {
            JOptionPane.showMessageDialog(null, "Error creating server broker");
        }
    }

    public void run() {// the main loop of the server
        while (true) {

            try {
                Socket s = null;
                s = server.accept();
                processRequest(s);
            } catch (IOException e) {
            }
        }
    }

    private void processAgentUpdate(ObjectOutputStream out, Message msg) {
        /* Validate login for the time being is just to check it's not already logged */
        String username = (String) msg.getData().get(Message.KEY_USERNAME);
        String host = (String) msg.getData().get(Message.KEY_HOST);
        Integer port = ((Integer) msg.getData().get(Message.KEY_PORT));
        Integer status = ((Integer) msg.getData().get(Message.KEY_AGENT_STATUS));
        System.out.println("Processing update for: " + username + " setting status " + status);
        boolean found = false;
        for (int i = 0; i < agentList.size(); i++) {
            System.out.println("Comparing with ->" + username + "<-");
            System.out.println("Comparing with ->" + ((AgentData) agentList.get(i)).getUsername() + "<-");

            if (((AgentData) agentList.get(i)).getUsername().equals(username)) {
                AgentData current = (AgentData) agentList.get(i);
                /* Update agent data */
                if (host != null) {
                    current.setHostname(host);
                }
                if (port != null) {
                    current.setPort(port.intValue());
                }
                if (status != null) {
                    current.setStatus(status.intValue());
                }
                agentList.set(i, current);
                found = true;
                break;
            }
        }
        if (!found) {
            System.out.println("Adding to agent list username " + username + " host " + host);
            agentList.add(new AgentData(username, host, port.intValue(), AgentData.STATUS_AVAILABLE));
        }
        TreeMap data = new TreeMap();
        data.put(Message.KEY_CMD_RESULT, Codes.RESULT_SUCCESSFULL);
        msg = new Message(Message.CMD_AGENT_UPATE_RESPONSE, data);
        try {
            out.writeObject(msg);
            out.close();
        } catch (IOException e) {
        }
    }

    private void processConnect(ObjectOutputStream out, Message msg) {
        String username = (String) msg.getData().get(Message.KEY_USERNAME);
        String usernameDest = (String) msg.getData().get(Message.KEY_USERNAME_DESTINATION);
        for (int i = 0; i < agentList.size(); i++) {
            if (((AgentData) agentList.get(i)).getUsername().equals(username)) {
                System.out.println("Chaning sattus of " + username);
                AgentData current = (AgentData) agentList.get(i);
                current.setStatus(AgentData.STATUS_ON_SESSION);
                agentList.set(i, current);
            }
            if (((AgentData) agentList.get(i)).getUsername().equals(usernameDest)) {
                System.out.println("Chaning sattus of " + usernameDest);
                AgentData current = (AgentData) agentList.get(i);
                current.setStatus(AgentData.STATUS_ON_SESSION);
                agentList.set(i, current);
            }
        }
        TreeMap data = new TreeMap();
        data.put(Message.KEY_CMD_RESULT, Codes.RESULT_SUCCESSFULL);
        msg = new Message(Message.CMD_CONNECT_RESPONSE, data);
        try {
            out.writeObject(msg);
            out.close();
        } catch (IOException e) {
        }
    }

    private void processGetUser(ObjectOutputStream out, Message msg) {
        System.out.println("Processing Get User List");
        TreeMap data = new TreeMap();
        data.put(Message.KEY_CMD_RESULT, Codes.RESULT_SUCCESSFULL);
        data.put(Message.KEY_USER_LIST, agentList);
        for (int i = 0; i < agentList.size(); i++) {
            System.out.println("list[" + i + " ] = Username = " + ((AgentData) agentList.get(i)).getUsername() + " status = " + ((AgentData) agentList.get(i)).getStatus());
        }
        msg = new Message(Message.CMD_GET_USERLIST_RESULT, data);
        try {
            out.writeObject(msg);
            out.close();
        } catch (IOException e) {
        }
    }


    private void processRequest(Socket s) {
        try {
            ObjectInputStream in = new ObjectInputStream(s.getInputStream());
            ObjectOutputStream out = new ObjectOutputStream(s.getOutputStream());
            Message msg = (Message) in.readObject();

            if (msg.getCmd() == Message.CMD_GET_USERLIST) {
                processGetUser(out, msg);
            } else if (msg.getCmd() == Message.CMD_CONNECT) {
                processConnect(out, msg);
            } else if (msg.getCmd() == Message.CMD_AGENT_UPATE) {
                processAgentUpdate(out, msg);
            } else {
                JOptionPane.showMessageDialog(null, "Invalid command");
            }

            in.close();
            out.close();
        } catch (IOException e) {
            JOptionPane.showMessageDialog(null, "Error reading from input stream");
        } catch (ClassNotFoundException e) {
            JOptionPane.showMessageDialog(null, "Error reading from input stream");
        }
    }
}
[+][-]12/07/05 12:57 AM, ID: 15434531Accepted Solution

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Zone: Java Programming Language
Tags: new, closing, error
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Solution Provided By: mayankeagle
Participating Experts: 2
Solution Grade: A
 
[+][-]12/06/05 07:21 AM, ID: 15428117Expert Comment

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