package thread.exercises.goteborg.ball.freezingBalls;
import thread.exercises.goteborg.ball.init.BallWorld;
import javax.swing.*;
import java.awt.*;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Semaphore;
public class Balls {
public static void nap(int ms) {
try {
Thread.sleep(ms);
} catch (InterruptedException e) {
//
// Print out the name of the tread that caused this.
//
System.err.println("Thread " + Thread.currentThread().getName() +
" throwed exception " + e.getMessage());
}
}
public static void main(String[] a) {
final BallWorld world = new BallWorld();
final JFrame win = new JFrame();
SwingUtilities.invokeLater(() -> {
win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
win.getContentPane().add(world);
win.pack();
win.setVisible(true);
});
Thread.currentThread().setName("MyMainThread");
Semaphore barrier = new Semaphore(4);
try {
barrier.acquire(4);
} catch (InterruptedException e) {
e.printStackTrace();
}
List<Ball> balls = new ArrayList<>();
Ball red = new Ball(world, 50, 80, 5, 10, Color.red, barrier);
red.start();
balls.add(red);
nap((int) (1000 * Math.random()));
Ball blue = new Ball(world, 70, 100, 8, 6, Color.blue, barrier);
blue.start();
balls.add(blue);
nap((int) (1000 * Math.random()));
Ball green = new Ball(world, 150, 100, 9, 7, Color.green, barrier);
green.start();
balls.add(green);
nap((int) (1000 * Math.random()));
Ball black = new Ball(world, 200, 130, 3, 8, Color.black, barrier);
black.start();
balls.add(black);
nap((int) (5000 * Math.random()));
while(true) {
while (barrier.availablePermits() < 4) {
nap((int) (1000 * Math.random()));
}
nap((int) (1000 * Math.random()));
try {
barrier.acquire(4);
} catch (InterruptedException e) {
e.printStackTrace();
}
for (Ball b : balls) {
b.unFreeze();
nap((int) (100 * Math.random()));
}
}
}
}