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Louis Heredero 2025-01-13 18:18:14 +01:00
parent c7d054e973
commit afc2fbfa8a
Signed by: HEL
GPG Key ID: 8D83DE470F8544E7
13 changed files with 478 additions and 0 deletions
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124
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17
src/exercises/ex_k_bis1/Customer.java Normal file
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package exercises.ex_k_bis1;
public class Customer implements Runnable {
/*private String name;
private ServiceDesk serviceDesk;
public Customer(String name, ServiceDesk serviceDesk) {
this.name = name;
this.serviceDesk = serviceDesk;
}
*/
@Override
public void run() {
}
}

22
src/exercises/ex_k_bis1/TestServiceDesk.java Normal file
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package exercises.ex_k_bis1;
public class TestServiceDesk {
public static void main(String[] args) {
/*
ServiceDesk serviceDesk = new ServiceDesk(2);
for (int j = 0; j<3; j++) {
new Thread(new ServiceRepresentative(serviceDesk), "Employee-"+ j).start();
}
// Start customer threads
for (int i = 0; i < 10; i++) { // 30 customers
String name = "Customer-" + i;
new Thread(new Customer(name, serviceDesk)).start();
try {
Thread.sleep((int) (Math.random() * 1000)); // Random arrival
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
*/
}
}

75
src/exercises/ex_n_bis/LibraryCatalog.java Normal file
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package exercises.ex_n_bis;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
public class LibraryCatalog {
private final Map<String, String> catalog = new HashMap<>();
private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
private final Lock readLock = lock.readLock();
private final Lock writeLock = lock.writeLock();
public LibraryCatalog() {
}
public ArrayList<Book> getBooks() {
ArrayList<Book> books = new ArrayList<>();
try {
readLock.lock();
catalog.forEach((title, author) -> {
books.add(new Book(title, author));
});
} finally {
readLock.unlock();
}
return books;
}
public String findBook(String title) {
String author;
try {
readLock.lock();
author = catalog.get(title);
} finally {
readLock.unlock();
}
if (author == null) {
System.out.println("The book '" + title + "' is not in the catalog");
return null;
}
return author;
}
public void addBook(String title, String author) {
try {
writeLock.lock();
catalog.put(title, author);
} finally {
writeLock.unlock();
}
}
public void removeBook(String title) {
try {
writeLock.lock();
catalog.remove(title);
} finally {
writeLock.unlock();
}
}
public void updateBook(String title, String newAuthor) {
try {
writeLock.lock();
catalog.replace(title, newAuthor);
} finally {
writeLock.unlock();
}
}
public record Book(String title, String author) {}
}

19
src/exercises/ex_w/Car.java Normal file
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package exercises.ex_w;
public class Car {
private String name;
private String licensePlateNumber;
public Car(String name, String licensePlateNumber) {
this.name = name;
this.licensePlateNumber = licensePlateNumber;
}
public String getLicensePlateNumber() {
return licensePlateNumber;
}
@Override
public String toString() {
return name;
}
}

18
src/exercises/ex_w/Customer.java Normal file
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package exercises.ex_w;
public class Customer implements Runnable {
private final String name;
private final String licensePlateNumber;
private Car car;
public Customer(String name, Car car) {
this.name = name;
this.car = car;
licensePlateNumber = car.getLicensePlateNumber();
}
@Override
public void run() {
}
}

33
src/exercises/ex_w/Garage.java Normal file
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package exercises.ex_w;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Exchanger;
public class Garage implements Runnable {
private List<Car> courtesyCars = new ArrayList<>();
private Exchanger<Car> receiveExchanger = new Exchanger<>();
public Garage() {
}
public Car leaveForRepair(Car car) throws InterruptedException {
return receiveExchanger.exchange(car);
}
@Override
public void run() {
while (true) {
Car courtesyCar = courtesyCars.removeFirst();
try {
Car toRepair = receiveExchanger.exchange(courtesyCar);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
}

12
src/exercises/ex_w/TestingExchanger_Garage.java Normal file
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package exercises.ex_w;
public class TestingExchanger_Garage {
String[] carTypes = {"Seat Alhambra", "BMW Mini", "Tesla 3"};
public static void main(String[] args) {
// Create a Customer thread and a Garage thread
// that use an exchanger for replacing the customer car
// with a courtesy car during the reparation. At the end of the day,
// the cars are exchanged back.
Garage garage = new Garage();
}
}

23
src/exercises/ex_z4/AuctionMain.java Normal file
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package exercises.ex_z4;
import java.util.Random;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.Semaphore;
public class AuctionMain {
public static final String[] names = {
"Sabrina", "José", "Patrick", "Salomé", "Lisa", "Alfred", "Annna", "Alex", "Kevin"
};
public static void main(String[] args) {
Semaphore mutex = new Semaphore(1);
ConcurrentLinkedQueue<Bid> bids = new ConcurrentLinkedQueue<>();
Auctioneer auctioneer = new Auctioneer("Paul", bids, mutex);
new Thread(auctioneer).start();
for (int i = 0; i < names.length; i++) {
new Thread(new Bidder(names[i])).start();
}
}
}

81
src/exercises/ex_z4/Auctioneer.java Normal file
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package exercises.ex_z4;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.Semaphore;
public class Auctioneer implements Runnable {
private String name;
private ConcurrentLinkedQueue<Bid> bids;
private Semaphore mutex;
private Bid maximumBid;
private Thread countdownThread = null;
public Auctioneer(String name, ConcurrentLinkedQueue<Bid> bids, Semaphore mutex) {
this.name = name;
this.bids = bids;
this.mutex = mutex;
}
public void placeBid(Bid bid) {
bids.add(bid);
notify();
}
private void countdown() {
try {
Thread.sleep(1000);
System.out.println("Three");
Thread.sleep(1000);
System.out.println("Two");
Thread.sleep(1000);
System.out.println("One");
Thread.sleep(1000);
System.out.println("End of the Auction !");
notify();
} catch (InterruptedException _) {}
}
public void startCountdown() {
countdownThread = new Thread(this::countdown);
countdownThread.start();
}
public Bid getMaximumBid() {
return maximumBid;
}
public void endAuction(){
System.out.println("End of the auction ! ");
notifyAll();
}
@Override
public void run() {
while (true) {
try {
mutex.acquire();
Bid current_bid = bids.poll();
if (current_bid == null) {
startCountdown();
wait();
if (bids.isEmpty()) {
endAuction();
}
continue;
}
if (!bids.isEmpty()) {
if (current_bid.amount() > maximumBid.amount()) {
maximumBid = current_bid;
System.out.println("New bid : " + maximumBid.amount() + " by " + maximumBid.bidder());
mutex.release();
return;
}
} else {
mutex.release();
}
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
}

5
src/exercises/ex_z4/Bid.java Normal file
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package exercises.ex_z4;
public record Bid(Bidder bidder, double amount) {
}

44
src/exercises/ex_z4/Bidder.java Normal file
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package exercises.ex_z4;
import java.util.Random;
import java.util.ArrayList;
import java.util.List;
public class Bidder implements Runnable {
private static int nextId = 0;
private final String name;
private final int id;
private final List<Item> items = new ArrayList<>();
private Double lastBid = null;
public Bidder(String name) {
this.name = name;
this.id = nextId++;
}
@Override
public void run() {
while(true){
Random rand = new Random();
double addon = rand.nextDouble(500);
lastBid += addon;
}
}
public String getName() {
return name;
}
public int getId() {
return id;
}
public Double getLastBid() {
return lastBid;
}
@Override
public String toString() {
return "(" + id + ") " + name;
}
}

5
src/exercises/ex_z4/Item.java Normal file
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package exercises.ex_z4;
public record Item(String name) {
}