103 lines
2.5 KiB
Java
103 lines
2.5 KiB
Java
//: concurrency/waxomatic2/WaxOMatic2.java
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// Using Lock and Condition objects.
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package concurrency.waxomatic2;
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import java.util.concurrent.*;
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import java.util.concurrent.locks.*;
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import static net.mindview.util.Print.*;
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class Car {
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private Lock lock = new ReentrantLock();
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private Condition condition = lock.newCondition();
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private boolean waxOn = false;
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public void waxed() {
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lock.lock();
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try {
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waxOn = true; // Ready to buff
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condition.signalAll();
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} finally {
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lock.unlock();
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}
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}
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public void buffed() {
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lock.lock();
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try {
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waxOn = false; // Ready for another coat of wax
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condition.signalAll();
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} finally {
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lock.unlock();
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}
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}
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public void waitForWaxing() throws InterruptedException {
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lock.lock();
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try {
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while(waxOn == false)
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condition.await();
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} finally {
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lock.unlock();
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}
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}
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public void waitForBuffing() throws InterruptedException{
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lock.lock();
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try {
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while(waxOn == true)
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condition.await();
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} finally {
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lock.unlock();
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}
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}
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}
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class WaxOn implements Runnable {
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private Car car;
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public WaxOn(Car c) { car = c; }
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@Override
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public void run() {
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try {
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while(!Thread.interrupted()) {
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printnb("Wax On! ");
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TimeUnit.MILLISECONDS.sleep(200);
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car.waxed();
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car.waitForBuffing();
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}
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} catch(InterruptedException e) {
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print("Exiting via interrupt");
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}
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print("Ending Wax On task");
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}
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}
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class WaxOff implements Runnable {
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private Car car;
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public WaxOff(Car c) { car = c; }
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@Override
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public void run() {
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try {
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while(!Thread.interrupted()) {
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car.waitForWaxing();
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printnb("Wax Off! ");
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TimeUnit.MILLISECONDS.sleep(200);
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car.buffed();
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}
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} catch(InterruptedException e) {
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print("Exiting via interrupt");
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}
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print("Ending Wax Off task");
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}
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}
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public class WaxOMatic2 {
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public static void main(String[] args) throws Exception {
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Car car = new Car();
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ExecutorService exec = Executors.newCachedThreadPool();
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exec.execute(new WaxOff(car));
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exec.execute(new WaxOn(car));
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TimeUnit.SECONDS.sleep(5);
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exec.shutdownNow();
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}
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} /* Output: (90% match)
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Wax On! Wax Off! Wax On! Wax Off! Wax On! Wax Off! Wax On! Wax Off! Wax On! Wax Off! Wax On! Wax Off! Wax On! Wax Off! Wax On! Wax Off! Wax On! Wax Off! Wax On! Wax Off! Wax On! Wax Off! Wax On! Wax Off! Wax On! Exiting via interrupt
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Ending Wax Off task
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Exiting via interrupt
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Ending Wax On task
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*///:~
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