// initialize client UI
private void initComponents() {
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setTitle("Distributed Hash Table Client");
keyBox = new JTextField(7);
valueBox = new JTextField(15);
serverBox = new JTextField(2);
keyLabel = new JLabel("Key: ");
keyLabel.setLabelFor(keyBox);
valueLabel = new JLabel("Value: ");
valueLabel.setLabelFor(valueBox);
serverLabel = new JLabel("Server Id: ");
serverLabel.setLabelFor(serverBox);
serverOutput = new JLabel("Server Output:");
JPanel pane = new JPanel(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 0;
pane.add(keyLabel, c);
c.gridx = 1;
pane.add(keyBox, c);
c.gridx = 0;
c.gridy = 1;
pane.add(valueLabel, c);
c.gridx = 1;
pane.add(valueBox, c);
c.gridx = 0;
c.gridy = 2;
pane.add(serverLabel, c);
c.gridx = 1;
pane.add(serverBox, c);
RadioListener radioListener = new RadioListener();
actionGroup = new ButtonGroup();
insertRadionButton = new JRadioButton("Insert");
insertRadionButton.setSelected(true);
insertRadionButton.setActionCommand("insert");
insertRadionButton.addActionListener(radioListener);
lookupRadionButton = new JRadioButton("Lookup");
lookupRadionButton.setActionCommand("lookup");
lookupRadionButton.addActionListener(radioListener);
deleteRadionButton = new JRadioButton("Delete");
deleteRadionButton.setActionCommand("delete");
deleteRadionButton.addActionListener(radioListener);
countRadionButton = new JRadioButton("Count");
countRadionButton.setActionCommand("count");
countRadionButton.addActionListener(radioListener);
actionGroup.add(insertRadionButton);
actionGroup.add(lookupRadionButton);
actionGroup.add(deleteRadionButton);
actionGroup.add(countRadionButton);
c.gridx = 2;
c.gridy = 0;
pane.add(insertRadionButton, c);
c.gridy = 1;
pane.add(lookupRadionButton, c);
c.gridy = 2;
pane.add(deleteRadionButton, c);
c.gridy = 3;
pane.add(countRadionButton, c);
execButton = new JButton("Execute");
execButton.addActionListener(new ExecButtonListener());
c.gridx = 3;
c.gridy = 0;
pane.add(execButton, c);
purgeButton = new JButton("Purge");
purgeButton.addActionListener(new PurgeButtonListener());
c.gridx = 3;
c.gridy = 2;
pane.add(purgeButton, c);
resultArea = new JTextArea(28, 70);
resultArea.setEditable(false);
scrollingArea = new JScrollPane(resultArea);
upperPanel = new Panel(new BorderLayout());
upperPanel.add(pane, BorderLayout.CENTER);
resultPanel = new Panel();
resultPanel.setLayout(new FlowLayout(FlowLayout.CENTER));
resultPanel.add(serverOutput);
resultPanel.add(scrollingArea);
add(upperPanel, BorderLayout.NORTH);
add(resultPanel, BorderLayout.CENTER);
setSize(800, 600);
this.setVisible(true);
}
// append string to the output text area
private void appendOutput(String msg) {
resultArea.append(msg + "\n");
resultArea.append(" ******************************\n");
}