70 lines
2.2 KiB
Java
70 lines
2.2 KiB
Java
package chat;
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import java.io.IOException;
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import java.net.ServerSocket;
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import java.net.Socket;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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public class ChatServer {
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private final int port;
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private final Set<ClientHandler> connectedClients;
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private final ExecutorService threadPool;
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public ChatServer(int port) {
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this.port = port;
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this.connectedClients = Collections.synchronizedSet(new HashSet<>());
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this.threadPool = Executors.newCachedThreadPool();
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}
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public void start() {
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try (ServerSocket serverSocket = new ServerSocket(port)) {
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System.out.println("Chat server started on port " + port);
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while (true) {
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Socket clientSocket = serverSocket.accept();
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ClientHandler clientHandler = new ClientHandler(clientSocket, this);
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connectedClients.add(clientHandler);
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threadPool.execute(clientHandler);
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}
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} catch (IOException e) {
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System.err.println("Server error: " + e.getMessage());
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} finally {
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threadPool.shutdown();
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}
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}
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public void broadcast(String message, ClientHandler sender) {
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// step 1: iterate through connectedClients safely
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// step 2: skip the sender client
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// step 3: send message to remaining clients using sendMessage
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}
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public void broadcastSystemMessage(String message) {
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// step 1: iterate through all connected clients
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// step 2: send system message to each client
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}
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public void removeClient(ClientHandler clientHandler) {
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// step 1: remove client from connectedClients set
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// step 2: retrieve username from clientHandler
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// step 3: broadcast system message about user leaving
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}
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public static void main(String[] args) {
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int port = 12345;
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if (args.length > 0) {
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try {
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port = Integer.parseInt(args[0]);
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} catch (NumberFormatException e) {
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System.err.println("Invalid port. Using default: " + port);
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}
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}
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new ChatServer(port).start();
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}
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}
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