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package threads;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.logging.*;
import javax.swing.*;
/**
*
* @author André Uhres
*/
public class ThreadsDemo extends JFrame {
private JButton btRefresh1, btRefresh2, btRefresh3, btRefreshAll;
private JLabel jLabel1, jLabel2, jLabel3, lbSum;
private JPanel jPanel1, jPanel2, jPanel3;
private final Random r = new Random();
private SwingWorker<Integer, Object> thread1, thread2, thread3;
private SwingWorker<Void, Void> threadSum;
private CountDownLatch latch;
public ThreadsDemo() {
btRefreshAll = new JButton();
jPanel1 = new JPanel();
btRefresh1 = new JButton();
jLabel1 = new JLabel();
jPanel2 = new JPanel();
btRefresh2 = new JButton();
jLabel2 = new JLabel();
jPanel3 = new JPanel();
btRefresh3 = new JButton();
jLabel3 = new JLabel();
lbSum = new JLabel();
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setTitle("ThreadDemo");
getContentPane().setLayout(new GridLayout(0, 1));
btRefreshAll.setText("Refresh all and calculate sum");
btRefreshAll.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
btRefreshAllActionPerformed(evt);
}
});
getContentPane().add(btRefreshAll);
jPanel1.setBorder(BorderFactory.createLineBorder(new Color(0, 0, 0)));
btRefresh1.setText("Refresh");
btRefresh1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(final ActionEvent evt) {
btRefresh1ActionPerformed(evt);
}
});
jPanel1.add(btRefresh1);
jLabel1.setText("0");
jLabel1.setPreferredSize(new Dimension(100, 14));
jPanel1.add(jLabel1);
getContentPane().add(jPanel1);
jPanel2.setBorder(BorderFactory.createLineBorder(new Color(0, 0, 0)));
btRefresh2.setText("Refresh");
btRefresh2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(final ActionEvent evt) {
btRefresh2ActionPerformed(evt);
}
});
jPanel2.add(btRefresh2);
jLabel2.setText("0");
jLabel2.setPreferredSize(new Dimension(100, 14));
jPanel2.add(jLabel2);
getContentPane().add(jPanel2);
jPanel3.setBorder(BorderFactory.createLineBorder(new Color(0, 0, 0)));
btRefresh3.setText("Refresh");
btRefresh3.addActionListener(new ActionListener() {
@Override
public void actionPerformed(final ActionEvent evt) {
btRefresh3ActionPerformed(evt);
}
});
jPanel3.add(btRefresh3);
jLabel3.setText("0");
jLabel3.setPreferredSize(new Dimension(100, 14));
jPanel3.add(jLabel3);
getContentPane().add(jPanel3);
lbSum.setBackground(new Color(255, 255, 204));
lbSum.setText("sum = 0");
lbSum.setOpaque(true);
getContentPane().add(lbSum);
setSize(400, 300);
setLocationRelativeTo(null);
}
private void btRefreshAllActionPerformed(final ActionEvent evt) {
btRefreshAll.setEnabled(false);
threadSum = new SwingWorker<Void, Void>() {
@Override
protected Void doInBackground() throws Exception {
latch = new CountDownLatch(3);
btRefresh1.doClick();
btRefresh2.doClick();
btRefresh3.doClick();
latch.await();
return null;
}
@Override
protected void done() {
int sum = Integer.parseInt(jLabel1.getText());
sum += Integer.parseInt(jLabel2.getText());
sum += Integer.parseInt(jLabel3.getText());
lbSum.setText("sum = " + String.valueOf(sum));
btRefreshAll.setEnabled(true);
}
};
threadSum.execute();
}
private void btRefresh1ActionPerformed(final ActionEvent evt) {
update(thread1, jLabel1);
}
private void btRefresh2ActionPerformed(final ActionEvent evt) {
update(thread2, jLabel2);
}
private void btRefresh3ActionPerformed(final ActionEvent evt) {
update(thread3, jLabel3);
}
private void update(SwingWorker<Integer, Object> thread, final JLabel label) {
if (thread == null || thread.isDone()) {
thread = new RefreshWorker(10, label);
thread.execute();
}
}
public static void main(final String args[]) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new ThreadsDemo().setVisible(true);
}
});
}
private class RefreshWorker extends SwingWorker<Integer, Object> {
private final int maxNum;
private final JLabel label;
public RefreshWorker(final int maxNum, final JLabel label) {
this.maxNum = maxNum;
this.label = label;
}
@Override
protected Integer doInBackground() throws Exception {
int num = r.nextInt(maxNum);
return num;
}
@Override
protected void done() {
try {
int num = get();
label.setText(String.valueOf(num));
} catch (InterruptedException ex) {
Logger.getLogger(ThreadsDemo.class.getName()).log(Level.SEVERE, null, ex);
} catch (ExecutionException ex) {
Logger.getLogger(ThreadsDemo.class.getName()).log(Level.SEVERE, null, ex);
} finally {
if (latch != null) {
latch.countDown();
}
}
}
}
} |
