URLMonitorPanelpublic class URLMonitorPanel extends JPanel implements URLPingTask.URLUpdate
| Fields Summary |
|---|
| ScheduledThreadPoolExecutor | executor | | ScheduledFuture | cancellable | | URL | url | | URLPingTask | task | | JPanel | status | | JButton | startButton | | JButton | stopButton |
| Constructors Summary |
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public URLMonitorPanel(String url, ScheduledThreadPoolExecutor se)
setLayout(new BorderLayout());
executor = se;
this.url = new URL(url);
add(new JLabel(url), BorderLayout.CENTER);
JPanel temp = new JPanel();
status = new JPanel();
status.setSize(20, 20);
temp.add(status);
startButton = new JButton("Start");
startButton.setEnabled(false);
startButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
makeTask();
startButton.setEnabled(false);
stopButton.setEnabled(true);
}
});
stopButton = new JButton("Stop");
stopButton.setEnabled(true);
stopButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
cancellable.cancel(true);
startButton.setEnabled(true);
stopButton.setEnabled(false);
}
});
temp.add(startButton);
temp.add(stopButton);
add(temp, BorderLayout.EAST);
makeTask();
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| Methods Summary |
|---|
| public void | isAlive(boolean b)
SwingUtilities.invokeLater(new Runnable() {
public void run() {
status.setBackground(b ? Color.GREEN : Color.RED);
status.repaint();
}
});
| | public static void | main(java.lang.String[] args)
JFrame frame = new JFrame("URL Monitor");
Container c = frame.getContentPane();
c.setLayout(new BoxLayout(c, BoxLayout.Y_AXIS));
ScheduledThreadPoolExecutor se =
new ScheduledThreadPoolExecutor((args.length + 1) / 2);
for (int i = 0; i < args.length; i++) {
c.add(new URLMonitorPanel(args[i], se));
}
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent evt) {
System.exit(0);
}
});
frame.pack();
frame.show();
| | private void | makeTask()
task = new URLPingTask(url, this);
cancellable = executor.scheduleAtFixedRate(task, 0L, 5L, TimeUnit.SECONDS);
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