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import com.sun.net.httpserver.HttpServer;

import java.io.IOException;

import java.io.OutputStream;

import java.net.InetSocketAddress;

import java.time.Duration;

import java.util.Timer;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.concurrent.ScheduledExecutorService;

import java.util.logging.Logger;

import static util.LogSystemStats.logSystemStats;

public class Threadpool {

public static void main(String[] args) throws IOException {

System.out.println("HTTP Server is running...");

HttpServer server = HttpServer.create(new InetSocketAddress(8084), 0);

server.createContext("/send", new VirtualThreadHttpServer.SendMessageHandler());

server.createContext("/messages", new VirtualThreadHttpServer.GetMessageHandler());

server.createContext("/login", new LoginHandler());

server.createContext("/logout", new LogoutHandler());

server.createContext("/register", new RegisterHandler());

server.createContext("/ping", new PingPongHandler());

// 🔁 Use traditional thread pool (pre-Java 21)

int poolSize = Runtime.getRuntime().availableProcessors() * 2;

System.out.println("Using thread pool size: " + poolSize);

ExecutorService executor = Executors.newFixedThreadPool(poolSize);

server.setExecutor(executor);

server.start();

System.out.println("Server started on port 8082 with thread pool size: " + poolSize);

ScheduledExecutorService statsLogger = Executors.newSingleThreadScheduledExecutor();

new Thread(() -> {

while (true) {

logSystemStats();

try {

Thread.sleep(5000); // 5 seconds in milliseconds

} catch (InterruptedException e) {

Thread.currentThread().interrupt();

}

}

}).start();

// every 5 seconds

}

}