Adds virtual threads example

pom.xml

@@ -32,8 +32,8 @@
 	</licenses>
 
 	<properties>
-		<maven.compiler.source>11</maven.compiler.source>
-		<maven.compiler.target>11</maven.compiler.target>
+		<maven.compiler.source>21</maven.compiler.source>
+		<maven.compiler.target>21</maven.compiler.target>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 

src/main/java/es/uvigo/esei/dai/threads/EchoBenchmark.java

+/*-
+ * #%L
+ * Ejemplos de DAI - Multithilo
+ * %%
+ * Copyright (C) 2014 - 2026 Miguel Reboiro Jato
+ * %%
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public
+ * License along with this program.  If not, see
+ * <http://www.gnu.org/licenses/gpl-3.0.html>.
+ * #L%
+ */
+package es.uvigo.esei.dai.threads;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.InetAddress;
+import java.net.Socket;
+import java.net.UnknownHostException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
+public class EchoBenchmark {
+    private final static String[] MESSAGES = {
+        "Hello", "How are you?", "I'm fine"
+    };
+
+    public static class EchoTask implements Runnable {
+        @Override
+        public void run() {
+            try (Socket socket = new Socket(InetAddress.getLocalHost(), 50000)) {
+                // Conexión con el servidor
+                final SocketIOManager ioManager = new SocketIOManager(socket);
+
+                for (String message : MESSAGES) {
+                    ioManager.println(message);
+    
+                    ioManager.readLine();
+                }
+
+                ioManager.println("quit");
+            } catch (final UnknownHostException e) {
+                System.out.println("Unknown host: localhost");
+            } catch (final IOException e) {
+                System.out.println("Connection error: " + e.getMessage());
+            }
+        }
+    }
+
+    public static void main(String[] args) throws InterruptedException {
+        long millis = System.currentTimeMillis();
+        ExecutorService service = Executors.newVirtualThreadPerTaskExecutor();
+
+        for (int i = 0; i < 10_000; i++) {
+            service.submit(new EchoTask());
+        }
+
+        service.shutdown();
+        service.awaitTermination(Long.MAX_VALUE, TimeUnit.DAYS);
+
+        System.out.println(System.currentTimeMillis() - millis);
+    }
+}

src/main/java/es/uvigo/esei/dai/threads/example4/VirtualThreadEchoServer.java

+/*-
+ * #%L
+ * Ejemplos de DAI - Multithilo
+ * %%
+ * Copyright (C) 2014 - 2023 Miguel Reboiro Jato
+ * %%
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public
+ * License along with this program.  If not, see
+ * <http://www.gnu.org/licenses/gpl-3.0.html>.
+ * #L%
+ */
+package es.uvigo.esei.dai.threads.example4;
+
+import java.io.IOException;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+import es.uvigo.esei.dai.threads.ServiceThread;
+
+public class VirtualThreadEchoServer {
+  public static void main(String[] args) {
+    try (ServerSocket serverSocket = new ServerSocket(50000)) {
+      final ExecutorService threadPool = Executors.newVirtualThreadPerTaskExecutor();
+
+      while (true) {
+        final Socket clientSocket = serverSocket.accept();
+
+        threadPool.execute(new ServiceThread(clientSocket));
+      }
+    } catch (final IOException e) {
+      System.err.println("Server socket could not be created");
+    }
+  }
+}

src/main/java/es/uvigo/esei/dai/threads/example4/AsynchronousMultiThreadedEchoServer.java → src/main/java/es/uvigo/esei/dai/threads/example5/AsynchronousMultiThreadedEchoServer.java

@@ -19,7 +19,7 @@
  * <http://www.gnu.org/licenses/gpl-3.0.html>.
  * #L%
  */
-package es.uvigo.esei.dai.threads.example4;
+package es.uvigo.esei.dai.threads.example5;
 
 import java.io.IOException;
 import java.net.InetSocketAddress;