Added multithreaded TcpClient and TcpServer

src/main/java/org/toop/Main.java

@@ -3,9 +3,11 @@ package org.toop;
 import org.toop.eventbus.Events;
 import org.toop.eventbus.GlobalEventBus;
 import org.toop.server.Server;
+import org.toop.server.backend.Testsss;
 
 import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.LogManager;
+import org.toop.server.backend.local.TcpServer;
 
 public class Main {
     private static final Logger logger = LogManager.getLogger(Main.class);
@@ -16,11 +18,11 @@ public class Main {
             throw new RuntimeException("A event could not be initialized");
         }
 
+        TcpServer server = new TcpServer(5001);
+        Thread serverThread = new Thread(server);
+        serverThread.start();
         Server.start("REMOTE", "127.0.0.1", "5001");
-
-        GlobalEventBus.post(new Events.ServerEvents.command("HELP", "THANK"));
-        GlobalEventBus.post(new Events.ServerEvents.command("GET"));
-
+//        Testsss.start(""); // Used for testing server.
         Window.start("");
 
     }

src/main/java/org/toop/eventbus/Events.java

@@ -20,6 +20,8 @@ public class Events implements IEvents {
          */
         public record OnCommand(org.toop.server.ServerCommand command, String[] args, String result) {}
 
+        public record ReceivedMessage(String message) {}
+
         /**
          * Triggers on changing the server backend.
          */

src/main/java/org/toop/server/Server.java

@@ -10,8 +10,8 @@ import org.toop.server.backend.local.Local;
 import org.toop.server.backend.remote.Remote;
 import org.toop.server.backend.remote.TcpClient;
 
+import java.io.IOException;
 import java.net.UnknownHostException;
-import java.util.Arrays;
 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.LinkedBlockingQueue;
 
@@ -24,16 +24,11 @@ public class Server extends Thread {
         REMOTE,
     }
 
-    public enum Message {
-        OK,
-        ERR,
-        SVR,
-    }
-
     String ip;
     String port;
     IBackend backend;
     BlockingQueue<String> commandQueue;
+    // TODO Reconnect and keep trying to connect.
 
     public Server(String set_backend, String set_ip, String set_port) {
         ip = set_ip;
@@ -107,6 +102,7 @@ public class Server extends Thread {
      */
     private void sendCommandByString(String command, String... args) {
         if (!ServerCommand.isValid(command)) {
+            logger.error("Invalid command: {}", command);
             return;
         }
 
@@ -123,27 +119,10 @@ public class Server extends Thread {
         command = String.join(" ", fullCommand);
 
         this.commandQueue.add(command);
-        logger.info("Command {} added to the queue", command);
+        logger.info("Command '{}' added to the queue", command);
 
     }
 
-//    /**
-//     * Sends a command to the server.
-//     *
-//     * @param command the command to execute
-//     * @return a Message indicating success or error
-//     */
-//    public void sendCommand(ServerCommand command) {
-//
-//        Message result = Message.OK;
-//
-//        this.commandQueue.add(command.toString());
-//
-//        GlobalEventBus.post(new Events.ServerEvents.OnCommand(command, new String[0], result));
-//
-//        return result;
-//    }
-
     @Override
     public String toString() {
         return String.format(
@@ -161,7 +140,6 @@ public class Server extends Thread {
                 -> this.setPort(event.port()));
     }
 
-
     /**
      * DO NOT USE, USE START INSTEAD.
      */
@@ -171,24 +149,43 @@ public class Server extends Thread {
             theRemoteServerTimeline(client);
         } catch (UnknownHostException | InterruptedException e) { // TODO Better error handling.
             throw new RuntimeException(e);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
         }
     }
 
-    private void theRemoteServerTimeline(TcpClient client) throws InterruptedException {
-        sleep(1000);
-        while (true) {
+    private void theRemoteServerTimeline(TcpClient client) throws InterruptedException { // TODO: Rename
+        sleep(1000); // Just wait, because why not
+
+        new Thread(() -> {
             try {
-                String command = this.commandQueue.take(); // waits until an element is available
-                logger.info("Sending command: {}", command);
+                while (true) {
+                    String received = client.readLine(); // blocks until a line is available
+                    if (received != null) {
+                        logger.info("Received: '{}'", received);
+                        GlobalEventBus.post(new Events.ServerEvents.ReceivedMessage(received));
+                    } else {
+                        break;
+                    }
+                }
+            } catch (IOException e) {
+                logger.error("Error reading from server", e);
+            }
+        }).start();
+
+        new Thread(() -> {
+            try {
+                while (true) {
+                    String command = commandQueue.take(); // blocks until a command is available
                     client.sendMessage(command);
-                client.readLine();
+                    logger.info("Sent command: '{}'", command);
+                }
             } catch (InterruptedException e) {
                 Thread.currentThread().interrupt();
-                break;
-            } catch (Exception e) {
-                logger.error("Error in remote server timeline", e);
-            }
+            } catch (IOException e) {
+                throw new RuntimeException(e);
             }
+        }).start();
     }
 
     /**
@@ -203,7 +200,7 @@ public class Server extends Thread {
         try {
             new Server(backend, ip, port).start();
         } catch (IllegalArgumentException e) {
-            new Server(backend, "127.0.0.1", "5001").start(); // TODO: Doesn't do anything.
+            new Server("REMOTE", "127.0.0.1", "5001").start(); // TODO: Doesn't do anything.
         }
     }
 

src/main/java/org/toop/server/ServerMessage.java

@@ -0,0 +1,45 @@
+package org.toop.server;
+
+import java.util.EnumSet;
+
+public enum ServerMessage {
+    OK,
+    ERR,
+    SVR;
+
+    private static final EnumSet<ServerMessage> VALID_COMMANDS = EnumSet.of(
+        ServerMessage.OK,     ServerMessage.ERR,     ServerMessage.SVR
+    );
+
+    public static EnumSet<ServerMessage> getValidCommands() {
+        return VALID_COMMANDS;
+    }
+
+    // TODO: Garbage code.
+    /**
+     * @param command Checks if string is a valid command.
+     * @return returns a boolean if string is a valid command.
+     */
+    public static boolean isValid(String command) {
+        try {
+            ServerMessage.valueOf(command.toUpperCase());
+            return true;
+        } catch (IllegalArgumentException err) {
+            return false;
+        }
+    }
+
+    // TODO: Return something better
+    /**
+     * @param command Converts a string into a ServerCommand.
+     * @return returns a ServerCommand enum.
+     */
+    public static ServerMessage getCommand(String command) {
+        if (isValid(command)) {
+            ServerMessage.valueOf(command.toUpperCase());
+            return ServerMessage.valueOf(command.toUpperCase());
+        }
+        return null;
+    }
+
+}

src/main/java/org/toop/server/backend/IBackend.java

@@ -1,9 +1,9 @@
 package org.toop.server.backend;
 
-import org.toop.server.Server;
+import org.toop.server.ServerMessage;
 
 public interface IBackend {
-    Server.Message login(String username);
+    ServerMessage login(String username);
 //    boolean isValidBackend(String backend);
 }
 

src/main/java/org/toop/server/backend/Testsss.java

@@ -0,0 +1,25 @@
+package org.toop.server.backend;
+
+import org.toop.eventbus.Events;
+import org.toop.eventbus.GlobalEventBus;
+
+public class Testsss extends Thread {
+
+    public Testsss() {}
+
+    public void run() {
+        while (true) {
+            try {
+                sleep(1000);
+                GlobalEventBus.post(new Events.ServerEvents.command("HELP", "TEST"));
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
+    public static void start(String keepEmpty) {
+        new Testsss().start();
+    }
+
+}

src/main/java/org/toop/server/backend/local/Local.java

@@ -1,11 +1,11 @@
 package org.toop.server.backend.local;
 
-import org.toop.server.Server;
+import org.toop.server.ServerMessage;
 import org.toop.server.backend.IBackend;
 
 public class Local implements IBackend {
     @Override
-    public Server.Message login(String username) {
+    public ServerMessage login(String username) {
         return null;
     }
 

src/main/java/org/toop/server/backend/local/TcpServer.java

@@ -0,0 +1,63 @@
+package org.toop.server.backend.local;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.toop.Main;
+
+import java.io.*;
+import java.net.*;
+
+public class TcpServer implements Runnable {
+
+    private static final Logger logger = LogManager.getLogger(Main.class);
+
+    private int port;
+    private boolean running = true;
+
+    public TcpServer(int port) {
+        this.port = port;
+    }
+
+    @Override
+    public void run() {
+        try (ServerSocket serverSocket = new ServerSocket(port)) {
+            logger.info("Server listening on port " + port);
+
+            while (running) {
+                Socket clientSocket = serverSocket.accept();
+                logger.info("Connected to client: " + clientSocket.getInetAddress());
+
+                // Handle each client in a new thread
+                new Thread(() -> handleClient(clientSocket)).start();
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private void handleClient(Socket clientSocket) {
+        try (
+                BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
+                PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true)
+        ) {
+            String message;
+            while ((message = in.readLine()) != null) {
+                logger.info("Received: " + message);
+                out.println("Echo: " + message);
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        } finally {
+            try {
+                clientSocket.close();
+                logger.info("Client disconnected.");
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    public void stop() {
+        running = false;
+    }
+}

src/main/java/org/toop/server/backend/remote/Remote.java

@@ -1,11 +1,11 @@
 package org.toop.server.backend.remote;
 
-import org.toop.server.Server;
+import org.toop.server.ServerMessage;
 import org.toop.server.backend.IBackend;
 
 public class Remote implements IBackend {
     @Override
-    public Server.Message login(String username) {
+    public ServerMessage login(String username) {
         return null;
     }
 

src/main/java/org/toop/server/backend/remote/TcpClient.java

@@ -24,9 +24,12 @@ public class TcpClient {
         this.out = createOut();
     }
 
-    public TcpClient(String serverIp, int serverPort) throws UnknownHostException {
+    public TcpClient(String serverIp, int serverPort) throws IOException {
         this.serverAddress = InetAddress.getByName(serverIp);
         this.serverPort = serverPort;
+        this.socket = createSocket();
+        this.in = createIn();
+        this.out = createOut();
     }
 
     private Socket createSocket() throws IOException {
@@ -42,7 +45,7 @@ public class TcpClient {
     }
 
     public void sendMessage(String message) throws IOException {
-        this.out.write(message);
+        this.out.println(message);
     }
 
     public String readLine() throws IOException {