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ListenerExamples.java
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package net.jcip.examples;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.*;
import java.util.concurrent.*;
import javax.swing.*;
/**
* ListenerExamples
*
* @author Brian Goetz and Tim Peierls
*/
public class ListenerExamples {
private static ExecutorService exec = Executors.newCachedThreadPool();
private final JButton colorButton = new JButton("Change color");
private final Random random = new Random();
private void backgroundRandom() {
colorButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
colorButton.setBackground(new Color(random.nextInt()));
}
});
}
private final JButton computeButton = new JButton("Big computation");
private void longRunningTask() {
computeButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
exec.execute(new Runnable() {
public void run() {
/* Do big computation */
}
});
}
});
}
private final JButton button = new JButton("Do");
private final JLabel label = new JLabel("idle");
private void longRunningTaskWithFeedback() {
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
button.setEnabled(false);
label.setText("busy");
exec.execute(new Runnable() {
public void run() {
try {
/* Do big computation */
} finally {
GuiExecutor.instance().execute(new Runnable() {
public void run() {
button.setEnabled(true);
label.setText("idle");
}
});
}
}
});
}
});
}
private final JButton startButton = new JButton("Start");
private final JButton cancelButton = new JButton("Cancel");
private Future<?> runningTask = null; // thread-confined
private void taskWithCancellation() {
startButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (runningTask != null) {
runningTask = exec.submit(new Runnable() {
public void run() {
while (moreWork()) {
if (Thread.currentThread().isInterrupted()) {
cleanUpPartialWork();
break;
}
doSomeWork();
}
}
private boolean moreWork() {
return false;
}
private void cleanUpPartialWork() {
}
private void doSomeWork() {
}
});
}
;
}
});
cancelButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
if (runningTask != null)
runningTask.cancel(true);
}
});
}
private void runInBackground(final Runnable task) {
startButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
class CancelListener implements ActionListener {
BackgroundTask<?> task;
public void actionPerformed(ActionEvent event) {
if (task != null)
task.cancel(true);
}
}
final CancelListener listener = new CancelListener();
listener.task = new BackgroundTask<Void>() {
public Void compute() {
while (moreWork() && !isCancelled())
doSomeWork();
return null;
}
private boolean moreWork() {
return false;
}
private void doSomeWork() {
}
public void onCompletion(boolean cancelled, String s, Throwable exception) {
cancelButton.removeActionListener(listener);
label.setText("done");
}
};
cancelButton.addActionListener(listener);
exec.execute(task);
}
});
}
}