started ex Z4

.idea/uiDesigner.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Palette2">
+    <group name="Swing">
+      <item class="com.intellij.uiDesigner.HSpacer" tooltip-text="Horizontal Spacer" icon="/com/intellij/uiDesigner/icons/hspacer.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="1" hsize-policy="6" anchor="0" fill="1" />
+      </item>
+      <item class="com.intellij.uiDesigner.VSpacer" tooltip-text="Vertical Spacer" icon="/com/intellij/uiDesigner/icons/vspacer.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="1" anchor="0" fill="2" />
+      </item>
+      <item class="javax.swing.JPanel" icon="/com/intellij/uiDesigner/icons/panel.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JScrollPane" icon="/com/intellij/uiDesigner/icons/scrollPane.svg" removable="false" auto-create-binding="false" can-attach-label="true">
+        <default-constraints vsize-policy="7" hsize-policy="7" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JButton" icon="/com/intellij/uiDesigner/icons/button.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="0" fill="1" />
+        <initial-values>
+          <property name="text" value="Button" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JRadioButton" icon="/com/intellij/uiDesigner/icons/radioButton.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="RadioButton" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JCheckBox" icon="/com/intellij/uiDesigner/icons/checkBox.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="3" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="CheckBox" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JLabel" icon="/com/intellij/uiDesigner/icons/label.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="0" anchor="8" fill="0" />
+        <initial-values>
+          <property name="text" value="Label" />
+        </initial-values>
+      </item>
+      <item class="javax.swing.JTextField" icon="/com/intellij/uiDesigner/icons/textField.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JPasswordField" icon="/com/intellij/uiDesigner/icons/passwordField.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JFormattedTextField" icon="/com/intellij/uiDesigner/icons/formattedTextField.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1">
+          <preferred-size width="150" height="-1" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTextArea" icon="/com/intellij/uiDesigner/icons/textArea.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTextPane" icon="/com/intellij/uiDesigner/icons/textPane.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JEditorPane" icon="/com/intellij/uiDesigner/icons/editorPane.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JComboBox" icon="/com/intellij/uiDesigner/icons/comboBox.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="2" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JTable" icon="/com/intellij/uiDesigner/icons/table.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JList" icon="/com/intellij/uiDesigner/icons/list.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="2" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTree" icon="/com/intellij/uiDesigner/icons/tree.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3">
+          <preferred-size width="150" height="50" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JTabbedPane" icon="/com/intellij/uiDesigner/icons/tabbedPane.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
+          <preferred-size width="200" height="200" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JSplitPane" icon="/com/intellij/uiDesigner/icons/splitPane.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="3" hsize-policy="3" anchor="0" fill="3">
+          <preferred-size width="200" height="200" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JSpinner" icon="/com/intellij/uiDesigner/icons/spinner.svg" removable="false" auto-create-binding="true" can-attach-label="true">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JSlider" icon="/com/intellij/uiDesigner/icons/slider.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="8" fill="1" />
+      </item>
+      <item class="javax.swing.JSeparator" icon="/com/intellij/uiDesigner/icons/separator.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="6" anchor="0" fill="3" />
+      </item>
+      <item class="javax.swing.JProgressBar" icon="/com/intellij/uiDesigner/icons/progressbar.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1" />
+      </item>
+      <item class="javax.swing.JToolBar" icon="/com/intellij/uiDesigner/icons/toolbar.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1">
+          <preferred-size width="-1" height="20" />
+        </default-constraints>
+      </item>
+      <item class="javax.swing.JToolBar$Separator" icon="/com/intellij/uiDesigner/icons/toolbarSeparator.svg" removable="false" auto-create-binding="false" can-attach-label="false">
+        <default-constraints vsize-policy="0" hsize-policy="0" anchor="0" fill="1" />
+      </item>
+      <item class="javax.swing.JScrollBar" icon="/com/intellij/uiDesigner/icons/scrollbar.svg" removable="false" auto-create-binding="true" can-attach-label="false">
+        <default-constraints vsize-policy="6" hsize-policy="0" anchor="0" fill="2" />
+      </item>
+    </group>
+  </component>
+</project>

src/exercises/ex_k_bis1/Customer.java

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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() {
+
+    }
+}

src/exercises/ex_k_bis1/TestServiceDesk.java

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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();
+            }
+        }
+        */
+    }
+}

src/exercises/ex_n_bis/LibraryCatalog.java

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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) {}
+}

src/exercises/ex_w/Car.java

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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;
+    }
+}

src/exercises/ex_w/Customer.java

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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() {
+
+    }
+}

src/exercises/ex_w/Garage.java

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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);
+            }
+
+        }
+    }
+}

src/exercises/ex_w/TestingExchanger_Garage.java

@@ -0,0 +1,12 @@
+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();
+    }
+}

src/exercises/ex_z4/AuctionMain.java

@@ -0,0 +1,23 @@
+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();
+        }
+    }
+}

src/exercises/ex_z4/Auctioneer.java

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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);
+            }
+        }
+    }
+}

src/exercises/ex_z4/Bid.java

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+package exercises.ex_z4;
+
+public record Bid(Bidder bidder, double amount) {
+
+}

src/exercises/ex_z4/Bidder.java

@@ -0,0 +1,44 @@
+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;
+    }
+}

src/exercises/ex_z4/Item.java

@@ -0,0 +1,5 @@
+package exercises.ex_z4;
+
+public record Item(String name) {
+
+}