Java3 lesson 5 homework.

src/lesson5/Car.java

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+package lesson5;
+
+import java.util.concurrent.BrokenBarrierException;
+import java.util.concurrent.CyclicBarrier;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class Car implements Runnable {
+    private static int CARS_COUNT;
+    static {
+        CARS_COUNT = 0;
+    }
+    private Race race;
+    private int speed;
+    private String name;
+    private CyclicBarrier carcb;
+    private static AtomicInteger ai = new AtomicInteger(0);
+
+    public int getSpeed() {
+        return speed;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Car (Race race, int speed, CyclicBarrier cyclicBarrier){
+        this.race = race;
+        this.speed = speed;
+        CARS_COUNT++;
+        this.name = "Участник №" + CARS_COUNT;
+        this.carcb = cyclicBarrier;
+
+    }
+
+    @Override
+    public void run() {
+        try {
+            System.out.println(this.name + " готовится");
+            Thread.sleep(500 + (int)(Math.random()*800));
+            System.out.println(this.name + " готов");
+            carcb.await();
+            carcb.await();
+            for (int i = 0; i < race.getStages().size(); i++) {
+                race.getStages().get(i).go(this);
+            }
+            if (ai.incrementAndGet() == 1){
+                System.out.println("ПОБЕДИТЕЛЬ - " + name);
+            }
+            carcb.await();
+            }catch (InterruptedException e){
+            e.printStackTrace();
+            }catch (BrokenBarrierException e){
+            e.printStackTrace();
+        }
+    }
+}

src/lesson5/MainClass.java

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+package lesson5;
+
+
+import java.util.concurrent.BrokenBarrierException;
+import java.util.concurrent.CyclicBarrier;
+import java.util.concurrent.Semaphore;
+
+public class MainClass {
+    public static final int CARS_COUNT = 4;
+    static Semaphore smp = new Semaphore(CARS_COUNT/2);
+    static CyclicBarrier cb = new CyclicBarrier(CARS_COUNT + 1);
+
+    public static void main(String[] args) {
+        System.out.println("ВАЖНОЕ ОБЪЯВЛЕНИЕ >>> Подготовка!!!");
+        Race race = new Race(new Road(60), new Tunnel(), new Road(40));
+        Car[] cars = new Car[CARS_COUNT];
+        for (int i = 0; i < cars.length; i++) {
+            cars[i] = new Car(race, 20 + (int)(Math.random()*10), cb);
+        }
+        for (int i = 0; i <cars.length ; i++) {
+            new Thread(cars[i]).start();
+        }
+
+        try{
+            cb.await();
+            System.out.println("ВАЖНОЕ ОБЪЯВЛЕНИЕ >>> Гонка началась!!!");
+            cb.await();
+            cb.await();
+        }catch (InterruptedException e){
+            e.printStackTrace();
+        }catch (BrokenBarrierException e){
+            e.printStackTrace();
+        }
+        System.out.println("ВАЖНОЕ ОБЪЯВЛЕНИЕ >>> Гонка закончилась!!!");
+    }
+}

src/lesson5/Race.java

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+package lesson5;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+
+public class Race {
+    private ArrayList<Stage> stages;
+
+    public ArrayList<Stage> getStages(){
+        return stages;
+    }
+
+    public Race(Stage...stages){
+        this.stages = new ArrayList<>(Arrays.asList(stages));
+    }
+}

src/lesson5/Road.java

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+package lesson5;
+
+public class Road extends Stage {
+    public Road(int length){
+        this.length = length;
+        this.description = "Дорога " + length + " метров";
+    }
+
+    @Override
+    public void go(Car c) {
+        try {
+            System.out.println(c.getName() + " начал этап: " + description);
+            Thread.sleep(length/c.getSpeed() * 1000);
+            System.out.println(c.getName() + " закончил этап: " + description);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+}

src/lesson5/Stage.java

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+package lesson5;
+
+import lesson5.Car;
+
+public abstract class Stage {
+    protected int length;
+    protected String description;
+
+    public String getDescription(){
+        return description;
+    }
+
+    public abstract void go(Car c);
+}

src/lesson5/Tunnel.java

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+package lesson5;
+
+public class Tunnel extends Stage {
+    public Tunnel(){
+        this.length = 80;
+        this.description = " Тоннель " + length + " метров";
+    }
+    @Override
+    public void go(Car c) {
+        try {
+            try {
+                System.out.println(c.getName() + " готовится к этапу (ждёт): " + description);
+                MainClass.smp.acquire();
+                System.out.println(c.getName() + " начал этап: " + description);
+                Thread.sleep(length/c.getSpeed() * 1000);
+            }catch (InterruptedException e){
+                e.printStackTrace();
+            }finally {
+                System.out.println(c.getName() + " закончил этап: " + description);
+                MainClass.smp.release();
+            }
+        }catch (Exception e){
+            e.printStackTrace();
+        }
+    }
+}