interruptablelongrunningcallable.java

Thinking in JAVA第四版源代码

//: gui/InterruptableLongRunningCallable.java
// Using Callables for long-running tasks.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.concurrent.*;
import net.mindview.util.*;
import static net.mindview.util.SwingConsole.*;

class CallableTask extends Task
implements Callable<String> {
  public String call() {
    run();
    return "Return value of " + this;
  }
}

public class
InterruptableLongRunningCallable extends JFrame {
  private JButton
    b1 = new JButton("Start Long Running Task"),
    b2 = new JButton("End Long Running Task"),
    b3 = new JButton("Get results");
  private TaskManager<String,CallableTask> manager =
    new TaskManager<String,CallableTask>();
  public InterruptableLongRunningCallable() {
    b1.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        CallableTask task = new CallableTask();
        manager.add(task);
        System.out.println(task + " added to the queue");
      }
    });
    b2.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        for(String result : manager.purge())
          System.out.println(result);
      }
    });
    b3.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        // Sample call to a Task method:
        for(TaskItem<String,CallableTask> tt :
            manager)
          tt.task.id(); // No cast required
        for(String result : manager.getResults())
          System.out.println(result);
      }
    });
    setLayout(new FlowLayout());
    add(b1);
    add(b2);
    add(b3);
  }
  public static void main(String[] args) {
    run(new InterruptableLongRunningCallable(), 200, 150);
  }
} ///:~