भीतरी वर्ग MySwingWorker अच्छी तरह से आपको क्या चाहिए कर सकते हैं:
package com.misc;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;
import java.util.concurrent.TimeUnit;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class FutureStuffGUI extends JFrame {
/**
* Provides a variant of SwingWorker which operates with a timeout.
*
* @param <T>
*/
private static abstract class MySwingWorker<T> {
private T result;
private Exception raised;
/**
* Constructor.
*
* @param timeout
* @param timeUnit
*/
public MySwingWorker(final long timeout, final TimeUnit timeUnit) {
result = null;
raised = null;
System.out.println(Thread.currentThread().getName() + " starting");
final FutureTask<T> future = new FutureTask<T>(new Callable<T>() {
public T call() throws Exception {
System.out.println(Thread.currentThread().getName() + " running");
T result = doInBackground();
return result;
}
});
System.out.println(Thread.currentThread().getName() + " future: " + future);
final Thread runner = new Thread(null, future, "FutureThread");
Thread watcher = new Thread(null, new Runnable() {
@Override
public void run() {
runner.start();
try {
result = future.get(timeout, timeUnit);
} catch (Exception ex) {
raised = ex;
}
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
assert SwingUtilities.isEventDispatchThread();
done();
}
});
}
}, "WatcherThread");
watcher.start();
}
/**
* Implement this method as the long-running background task.
*
* @return
* @throws Exception
*/
abstract protected T doInBackground() throws Exception;
/**
* This method is invoked from the UI Event Dispatch Thread on completion or timeout.
*/
abstract protected void done();
/**
* This method should be invoked by the implementation of done() to retrieve
* the result.
*
* @return
* @throws Exception
*/
protected T get() throws Exception {
assert SwingUtilities.isEventDispatchThread();
if (raised != null) {
throw raised;
} else {
return result;
}
}
}
public FutureStuffGUI() {
super("Hello");
init_components();
}
private void init_components() {
JPanel panel = new JPanel();
JButton button = new JButton("Press");
panel.add(button);
add(panel);
pack();
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
new MySwingWorker<String>(5, TimeUnit.SECONDS) {
@Override
protected String doInBackground() throws InterruptedException {
assert !SwingUtilities.isEventDispatchThread();
System.out.println(Thread.currentThread().getName() + " doInBackground");
// if (true) { throw new RuntimeException("Blow up"); }
Thread.sleep(6 * 1000);
return "Hello world!";
}
@Override
protected void done() {
assert SwingUtilities.isEventDispatchThread();
String result;
try {
result = get();
System.out.println(Thread.currentThread().getName() + " done; result: " + result);
} catch (Exception ex) {
System.out.println(Thread.currentThread().getName() + " done; errored:");
ex.printStackTrace();
}
}
};
};
});
}
public static void main(String[] args) {
FutureStuffGUI ui = new FutureStuffGUI();
ui.setVisible(true);
}
}
इसके अलावा: बस टाइमआउट के साथ कॉल() को कॉल करना अभी भी (संभावित रूप से महंगा) काम बाद में किया जा रहा है। कार्य को भी रद्द करने की आवश्यकता है (और इस तरह से लिखा गया है कि इसे वास्तव में काम करना रद्द कर देता है) – Sbodd
आप अपने काम को Future.cancel() विधि –
(जो थ्रेड इंटरप्टेड एक्सेप्शन उत्पन्न करता है, मुझे लगता है) –