Typing indicator + Metrics

Client/src/main/java/dev/wiing/gossip/client/Connection.java

@@ -2,12 +2,15 @@ package dev.wiing.gossip.client;
 
 import dev.wiing.gossip.lib.PacketHandler;
 import dev.wiing.gossip.lib.PacketManager;
+import dev.wiing.gossip.lib.PacketMetrics;
 import dev.wiing.gossip.lib.data.LongData;
 import dev.wiing.gossip.lib.models.SecretUser;
 import dev.wiing.gossip.lib.models.Topic;
 import dev.wiing.gossip.lib.models.User;
 import dev.wiing.gossip.lib.packets.*;
 
+import java.beans.PropertyChangeListener;
+import java.beans.PropertyChangeSupport;
 import java.io.IOException;
 import java.net.Socket;
 import java.net.SocketException;
@@ -18,6 +21,13 @@ public class Connection {
 
     private static final Connection instance = new Connection();
 
+    private PropertyChangeSupport changeSupport;
+
+    private boolean recordStats = false;
+
+    private String compiledConnectionStats = "CONNECTION STATS\nNeed an update";
+    private String compiledCacheStats = "CACHE STATS\nNeed an update";
+
     private final PacketManager packetManager = new PacketManager();
 
     private final PacketHandler packetHandler = new PacketHandler();
@@ -32,6 +42,7 @@ public class Connection {
 
     private Connection() {
         packetManager.registerPackets();
+        changeSupport = new PropertyChangeSupport(this);
     }
 
     public static Connection getInstance() {
@@ -51,6 +62,8 @@ public class Connection {
 
         public PacketHandlerRunnable(Connection connection) {
             this.connection = connection;
+
+            connection.packetHandler.addAllPacketsToMap(connection.packetManager.getPacketMap().values());
         }
 
         @Override
@@ -69,6 +82,8 @@ public class Connection {
                     if (!connection.getPacketHandler().runPacket(packet)) {
                         connection.queuedPackets.add(packet);
                     }
+
+                    connection.updateConnectionStats();
                 } catch (SocketException e) {
                     break;
                 } catch (IOException e) {
@@ -83,6 +98,91 @@ public class Connection {
         handlerThread.start();
     }
 
+    public void updateConnectionStats() {
+        if (!recordStats) return;
+
+        StringBuilder sb = new StringBuilder();
+
+        PacketMetrics m = packetManager.getPacketMetrics();
+
+        sb.append("OUTGOING CONNECTION\n");
+        sb.append("Packets Sent: ").append(m.getTotalPacketsSentCount()).append("\n");
+        sb.append("Bytes Sent: ").append(m.getTotalPacketsSentBytes()).append(" B\n");
+        sb.append("Common Types:\n");
+        m.getSendHistory().values().stream()
+                .filter(packets -> !packets.isEmpty())
+                .sorted((o1, o2) -> Integer.compare(o2.size(), o1.size()))
+                .limit(4)
+                .forEachOrdered(packets -> {
+                    sb      .append("  ")
+                            .append(packets.size())
+                            .append("x ")
+                            .append(packets.get(0).getClass().getSimpleName())
+                            .append("\n");
+                });
+
+        sb.append("\n");
+
+        sb.append("INCOMING CONNECTION\n");
+        sb.append("Packets Received: ").append(m.getTotalPacketsReceivedCount()).append("\n");
+        sb.append("Packets in Queue: ").append(getQueueSize()).append("\n");
+        sb.append("Bytes Received: ").append(m.getTotalPacketsReceivedBytes()).append(" B\n");
+        sb.append("Common Types:\n");
+        m.getReceiveHistory().values().stream()
+                .filter(packets -> !packets.isEmpty())
+                .sorted((o1, o2) -> Integer.compare(o2.size(), o1.size()))
+                .limit(4)
+                .forEachOrdered(packets -> {
+                    sb      .append("  ")
+                            .append(packets.size())
+                            .append("x ")
+                            .append(packets.get(0).getClass().getSimpleName())
+                            .append("\n");
+                });
+
+        compiledConnectionStats = sb.toString();
+
+        changeSupport.firePropertyChange("connectionStatsChange", null, compiledConnectionStats);
+    }
+
+    public void updateCacheStats() {
+        if (!recordStats) return;
+
+        StringBuilder sb = new StringBuilder();
+
+        sb.append("DATA CACHE\n");
+        sb.append("Users Cached: ").append(userCache.getSize()).append("\n");
+        sb.append("Topics Cached: ").append(topicCache.getSize()).append("\n");
+
+        compiledCacheStats = sb.toString();
+
+        changeSupport.firePropertyChange("cacheStatsChange", null, compiledCacheStats);
+    }
+
+    public boolean isRecordStats() {
+        return recordStats;
+    }
+
+    public String getCompiledConnectionStats() {
+        return compiledConnectionStats;
+    }
+
+    public String getCompiledCacheStats() {
+        return compiledCacheStats;
+    }
+
+    public void setRecordStats(boolean recordStats) {
+        this.recordStats = recordStats;
+    }
+
+    public void addStatListener(PropertyChangeListener listener) {
+        changeSupport.addPropertyChangeListener(listener);
+    }
+
+    public void removeStatListener(PropertyChangeListener listener) {
+        changeSupport.removePropertyChangeListener(listener);
+    }
+
     public Socket getSocket() {
         return socket;
     }
@@ -134,6 +234,8 @@ public class Connection {
                 continue;
             }
 
+            updateConnectionStats();
+
             return packet;
         }
     }
@@ -192,6 +294,10 @@ public class Connection {
         }
     }
 
+    public int getQueueSize() {
+        return queuedPackets.size();
+    }
+
     public SecretUser getSelf() {
         return self;
     }
@@ -230,7 +336,20 @@ public class Connection {
     });
 
     public User getUser(long userID) {
-        return userCache.get(userID);
+        int prevSize = userCache.getSize();
+
+        User result = userCache.get(userID);
+
+        if (prevSize != userCache.getSize())
+            updateCacheStats();
+
+        return result;
+    }
+
+    public void saveUser(User user) {
+        userCache.put(user.getUserID(), user);
+
+        updateCacheStats();
     }
 
     private final DataCache<Topic> topicCache = new DataCache<>(id -> {
@@ -263,6 +382,19 @@ public class Connection {
     });
 
     public Topic getTopic(long topicID) {
-        return topicCache.get(topicID);
+        int prevSize = topicCache.getSize();
+
+        Topic result = topicCache.get(topicID);
+
+        if (prevSize != topicCache.getSize())
+            updateCacheStats();
+
+        return result;
+    }
+
+    public void saveTopic(Topic topic) {
+        topicCache.put(topic.getId(), topic);
+
+        updateCacheStats();
     }
 }

Client/src/main/java/dev/wiing/gossip/client/DataCache.java

@@ -30,6 +30,7 @@ public class DataCache<T> {
 
         T result;
 
+        synchronized (cache) {
             if ((result = cache.getOrDefault(id, null)) != null) {
                 return result;
             }
@@ -38,6 +39,7 @@ public class DataCache<T> {
             if (result != null) {
                 cache.put(id, result);
             }
+        }
 
         return result;
     }
@@ -45,4 +47,8 @@ public class DataCache<T> {
     public void put(long id, T val) {
         cache.put(id, val);
     }
+
+    public int getSize() {
+        return cache.size();
+    }
 }

Client/src/main/java/dev/wiing/gossip/client/controllers/AvatarController.java

@@ -0,0 +1,120 @@
+package dev.wiing.gossip.client.controllers;
+
+import dev.wiing.gossip.client.data.UserAvatar;
+import dev.wiing.gossip.client.generic.Pair;
+import dev.wiing.gossip.client.utils.Utils;
+import dev.wiing.gossip.lib.models.User;
+import javafx.event.ActionEvent;
+import javafx.event.EventHandler;
+import javafx.fxml.FXML;
+import javafx.fxml.Initializable;
+import javafx.geometry.Pos;
+import javafx.scene.Parent;
+import javafx.scene.control.Button;
+import javafx.scene.control.Label;
+import javafx.scene.effect.ColorAdjust;
+import javafx.scene.effect.Effect;
+import javafx.scene.layout.FlowPane;
+import javafx.scene.layout.Pane;
+import javafx.scene.layout.VBox;
+
+import java.net.URL;
+import java.util.ResourceBundle;
+
+public class AvatarController implements Initializable {
+
+    private VBox selectedAvatarPair;
+
+    private UserAvatar selectedAvatar;
+
+    @FXML
+    private FlowPane flowAvatars;
+
+    @FXML
+    private Label lblSelectedDesc;
+
+    @FXML
+    private Label lblSelectedName;
+
+    @FXML
+    private Pane paneSelectedIcon;
+
+    @FXML
+    private VBox vboxAvatarButton;
+
+    @FXML
+    private Button btnSave;
+
+    @FXML
+    private VBox vboxRoot;
+
+    @Override
+    public void initialize(URL location, ResourceBundle resources) {
+        flowAvatars.getChildren().clear();
+
+        UserAvatar.MORNING.applyToRegionBackground(paneSelectedIcon, true);
+
+        Effect effect = new ColorAdjust(0.0, -1.0, -0.4, 0.0);
+
+        for (UserAvatar avatar : UserAvatar.getAvatars()) {
+            VBox vBox = new VBox();
+            vBox.getStyleClass().add("clickable");
+            vBox.setSpacing(16);
+            vBox.setAlignment(Pos.CENTER);
+
+            Pane pane = new Pane();
+            pane.setMinSize(64, 64);
+            pane.setMaxSize(64, 64);
+            avatar.applyToRegionBackground(pane, true);
+
+            Label label = new Label();
+            label.setText(avatar.getName());
+            label.getStyleClass().addAll("axis", "accent");
+
+            vBox.getChildren().addAll(pane, label);
+
+            vBox.setEffect(effect);
+
+            vBox.setOnMouseClicked(event -> {
+                if (selectedAvatarPair != null) {
+                    selectedAvatarPair.setEffect(effect);
+                }
+
+                selectedAvatarPair = vBox;
+
+                selectAvatar(avatar);
+
+                vBox.setEffect(null);
+            });
+
+            flowAvatars.getChildren().add(vBox);
+        }
+    }
+
+    public void selectAvatar(UserAvatar avatar) {
+        selectedAvatar = avatar;
+
+        lblSelectedName.setText(avatar.getName());
+        lblSelectedDesc.setText(avatar.getDescription());
+
+        avatar.applyToRegionBackground(paneSelectedIcon, false);
+
+        vboxRoot.setStyle("-accent: " + selectedAvatar.getColor());
+    }
+
+    public UserAvatar getSelectedAvatar() {
+        return selectedAvatar;
+    }
+
+    public void setOnSave(EventHandler<ActionEvent> eventHandler) {
+        btnSave.setOnAction(event -> {
+            btnSave.getScene().getWindow().hide();
+            eventHandler.handle(event);
+        });
+    }
+
+    public static Pair<Parent, AvatarController> createInstance() {
+        return Utils.createInstance("views/avatar-view.fxml");
+    }
+
+}

Client/src/main/java/dev/wiing/gossip/client/controllers/LoginController.java

@@ -3,6 +3,7 @@ package dev.wiing.gossip.client.controllers;
 
 import dev.wiing.gossip.client.Connection;
 import dev.wiing.gossip.client.data.UserAvatar;
+import dev.wiing.gossip.client.utils.Utils;
 import dev.wiing.gossip.lib.models.SecretUser;
 import dev.wiing.gossip.lib.packets.RegisterCredentialsPacket;
 import dev.wiing.gossip.lib.packets.Packet;
@@ -35,6 +36,11 @@ public class LoginController implements Initializable {
     @FXML
     private TextField txtUsername;
 
+    @FXML
+    private VBox vboxRoot;
+
+    private UserAvatar selectedAvatar = UserAvatar.MORNING;
+
     @Override
     public void initialize(URL location, ResourceBundle resources) {
         UserAvatar.MORNING.applyToRegionBackground(paneIcon, false);
@@ -42,17 +48,31 @@ public class LoginController implements Initializable {
         Circle circle = new Circle(paneIcon.getMinWidth() * 0.5);
         paneIcon.setShape(circle);
         hboxEditOverlay.setShape(circle);
+
+        vboxRoot.setStyle("-accent: " + selectedAvatar.getColor());
     }
 
     @FXML
     public void onChangeIcon(MouseEvent event) {
+        var pair = AvatarController.createInstance();
 
+        pair.second().selectAvatar(selectedAvatar);
+
+        Utils.openParentAsWindow(pair.first(), "Gossip -- Avatar Menu");
+
+        pair.second().setOnSave(event1 -> {
+            selectedAvatar = pair.second().getSelectedAvatar();
+
+            selectedAvatar.applyToRegionBackground(paneIcon, false);
+
+            vboxRoot.setStyle("-accent: " + selectedAvatar.getColor());
+        });
     }
 
     @FXML
     public void onLogin(ActionEvent event) {
         RegisterRequestPacket packet = new RegisterRequestPacket();
-        packet.setAvatarID((byte)0);
+        packet.setAvatarID((byte)selectedAvatar.getId());
         packet.setUsername(txtUsername.getText());
 
         Connection.getInstance().sendPacket(packet);

Client/src/main/java/dev/wiing/gossip/client/controllers/MainChatController.java

@@ -6,17 +6,22 @@ import dev.wiing.gossip.client.controllers.item.SystemMessageItemController;
 import dev.wiing.gossip.client.generic.Pair;
 import dev.wiing.gossip.client.utils.Utils;
 import dev.wiing.gossip.lib.models.SystemMessage;
+import dev.wiing.gossip.lib.models.User;
 import dev.wiing.gossip.lib.models.UserMessage;
 import dev.wiing.gossip.lib.models.Topic;
 import dev.wiing.gossip.lib.packets.MessagePushPacket;
 import dev.wiing.gossip.lib.packets.TopicJoinPacket;
+import dev.wiing.gossip.lib.packets.TypingPingPacket;
 import javafx.application.Platform;
 import javafx.event.ActionEvent;
 import javafx.fxml.FXML;
 import javafx.scene.Parent;
 import javafx.scene.control.Label;
 import javafx.scene.control.TextArea;
+import javafx.scene.input.KeyCode;
+import javafx.scene.input.KeyEvent;
 import javafx.scene.input.MouseEvent;
+import javafx.scene.layout.Region;
 import javafx.scene.layout.VBox;
 
 import java.beans.PropertyChangeEvent;
@@ -64,6 +69,10 @@ public class MainChatController {
     @FXML
     private VBox vboxVisitPage;
 
+    private Thread typingWaitThread = null;
+
+    private boolean composeFieldPreviouslyEmpty = true;
+
     public void setTopic(Topic topic) {
         this.topic = topic;
 
@@ -82,7 +91,7 @@ public class MainChatController {
                 });
             }
 
-            if (evt.getPropertyName().equals("messageAdd")) {
+            else if (evt.getPropertyName().equals("messageAdd")) {
                 Platform.runLater(() -> {
                     if (evt.getNewValue() instanceof UserMessage) {
                         addMessage((UserMessage)evt.getNewValue());
@@ -93,7 +102,13 @@ public class MainChatController {
                     }
                 });
             }
+
+            else if (evt.getPropertyName().equals("typingAdd") || evt.getPropertyName().equals("typingRemove")) {
+                Platform.runLater(this::updateTypingMembers);
+            }
         });
+
+        updateTypingMembers();
     }
 
     private void setTopicName(String name) {
@@ -163,24 +178,111 @@ public class MainChatController {
         }
     }
 
-    @FXML
+    private void sendMessage() {
-    void onSend(MouseEvent event) {
         String messageContents = txtCompose.getText();
 
+        if (messageContents.isBlank()) {
+            return;
+        }
+
+        composeFieldPreviouslyEmpty = true;
         txtCompose.clear();
 
         MessagePushPacket packet = new MessagePushPacket();
         packet.setTopicID(topic.getId());
-        packet.setMessage(messageContents);
+        packet.setMessage(messageContents.strip());
 
         Connection.getInstance().sendPacketAuthenticated(packet);
 
         try {
             Connection.getInstance().findAck(MessagePushPacket.TYPE);
-
         } catch (IOException e) {
             throw new RuntimeException(e);
         }
+
+        TypingPingPacket pingPacket = new TypingPingPacket();
+        pingPacket.setTyping(false);
+        pingPacket.setTopicID(topic.getId());
+
+        Connection.getInstance().sendPacketAuthenticated(pingPacket);
+
+        typingWaitThread.interrupt();
+        typingWaitThread = null;
+    }
+
+    @FXML
+    void onSend(MouseEvent event) {
+        sendMessage();
+    }
+
+    @FXML
+    void onKeyTyped(KeyEvent event) {
+        boolean isBlankTextField = txtCompose.getText().isBlank();
+
+        if (!isBlankTextField && typingWaitThread != null && typingWaitThread.isAlive()) return;
+
+        if (isBlankTextField && composeFieldPreviouslyEmpty) return;
+
+        TypingPingPacket packet = new TypingPingPacket();
+        packet.setTyping(!isBlankTextField);
+        packet.setTopicID(topic.getId());
+
+        Connection.getInstance().sendPacketAuthenticated(packet);
+
+        composeFieldPreviouslyEmpty = isBlankTextField;
+
+        if (typingWaitThread != null) typingWaitThread.interrupt();
+
+        if (isBlankTextField) return;
+
+        typingWaitThread = new Thread(() -> {
+            try {
+                Thread.sleep(5000);
+            } catch (InterruptedException ignored) {
+            }
+        });
+        typingWaitThread.start();
+    }
+
+    @FXML
+    void onKeyPressed(KeyEvent event) {
+        if (event.getCode() == KeyCode.ENTER) {
+            if (event.isShiftDown()) {
+                txtCompose.insertText(txtCompose.getLength(), "\n");
+            } else {
+                sendMessage();
+            }
+        }
+    }
+
+    public void updateTypingMembers() {
+        if (topic.getTypingUsersCount() == 0) {
+            lblTyping.setText("");
+            lblTyping.setMinHeight(0);
+            lblTyping.setMaxHeight(0);
+            return;
+        }
+
+        lblTyping.setMinHeight(Region.USE_COMPUTED_SIZE);
+        lblTyping.setMaxHeight(Region.USE_COMPUTED_SIZE);
+
+        if (topic.getTypingUsersCount() > 3) {
+            lblTyping.setText("Several babblers are writing...");
+            return;
+        }
+
+        StringBuilder sb = new StringBuilder();
+
+        for (User user : topic.getTypingUsersReadOnly()) {
+            if (!sb.isEmpty()) sb.append(", ");
+            sb.append(user.getUsername());
+        }
+
+        sb.append(topic.getTypingUsersCount() == 1 ? " is" : " are");
+
+        sb.append(" writing...");
+
+        lblTyping.setText(sb.toString());
     }
 
     public static Pair<Parent, MainChatController> createInstance() {
@@ -188,3 +290,6 @@ public class MainChatController {
     }
 
 }
+
+// TODO: better mutliline input
+// 25 + 17 per extra line

Client/src/main/java/dev/wiing/gossip/client/controllers/MainController.java

@@ -5,6 +5,7 @@ import dev.wiing.gossip.client.controllers.item.TopicItemController;
 import dev.wiing.gossip.client.data.UserAvatar;
 import dev.wiing.gossip.client.generic.Pair;
 import dev.wiing.gossip.client.utils.Utils;
+import dev.wiing.gossip.lib.PacketHandler;
 import dev.wiing.gossip.lib.data.LongData;
 import dev.wiing.gossip.lib.models.*;
 import dev.wiing.gossip.lib.packets.*;
@@ -14,15 +15,16 @@ import javafx.fxml.FXML;
 import javafx.fxml.Initializable;
 import javafx.scene.Parent;
 import javafx.scene.control.Label;
+import javafx.scene.input.MouseEvent;
 import javafx.scene.layout.AnchorPane;
 import javafx.scene.layout.Pane;
 import javafx.scene.layout.VBox;
 
 import java.net.SocketException;
 import java.net.URL;
-import java.util.Map;
+import java.util.*;
-import java.util.ResourceBundle;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.stream.Collectors;
 
 public class MainController implements Initializable {
 
@@ -48,6 +50,11 @@ public class MainController implements Initializable {
     @FXML
     private Label lblJoinMessage;
 
+    @FXML
+    private Label lblDebug;
+
+    private boolean recordDebugStats = false;
+
     @Override
     public void initialize(URL url, ResourceBundle resourceBundle) {
         User user = Connection.getInstance().getSelf();
@@ -74,7 +81,19 @@ public class MainController implements Initializable {
             throw new RuntimeException(e);
         }
 
-        Connection.getInstance().getPacketHandler().addListener(TopicCreatedPacket.class, packet -> {
+        setUpPacketHandler(Connection.getInstance().getPacketHandler());
+
+        Connection.getInstance().beginHandlingPackets();
+
+        vboxTopics.getChildren().clear();
+
+        Connection.getInstance().addStatListener(evt -> {
+            Platform.runLater(this::rebuildDebugStatText);
+        });
+    }
+
+    private void setUpPacketHandler(PacketHandler packetHandler) {
+        packetHandler.addListener(TopicCreatedPacket.class, packet -> {
             User host = Connection.getInstance().getUser(packet.getHostID());
 
             Topic topic = new Topic(
@@ -85,10 +104,12 @@ public class MainController implements Initializable {
                     packet.getTopicColor()
             );
 
+            Connection.getInstance().saveTopic(topic);
+
             addTopic(topic);
         });
 
-        Connection.getInstance().getPacketHandler().addListener(TopicUpdatePacket.class, packet -> {
+        packetHandler.addListener(TopicUpdatePacket.class, packet -> {
             if (!topicMap.containsKey(packet.getTopicID())) return;
 
             Topic topic = topicMap.get(packet.getTopicID()).second().getTopic();
@@ -111,7 +132,7 @@ public class MainController implements Initializable {
             }
         });
 
-        Connection.getInstance().getPacketHandler().addListener(MessageCreatedPacket.class, packet -> {
+        packetHandler.addListener(MessageCreatedPacket.class, packet -> {
             if (!topicMap.containsKey(packet.getTopicID())) return;
 
             Topic topic = topicMap.get(packet.getTopicID()).second().getTopic();
@@ -123,7 +144,7 @@ public class MainController implements Initializable {
             topic.addMessage(userMessage);
         });
 
-        Connection.getInstance().getPacketHandler().addListener(MessageSystemPacket.class, packet -> {
+        packetHandler.addListener(MessageSystemPacket.class, packet -> {
             if (!topicMap.containsKey(packet.getTopicID())) return;
 
             Topic topic = topicMap.get(packet.getTopicID()).second().getTopic();
@@ -138,9 +159,22 @@ public class MainController implements Initializable {
             topic.addMessage(systemMessage);
         });
 
-        Connection.getInstance().beginHandlingPackets();
+        packetHandler.addListener(TypingListUpdatePacket.class, packet -> {
+            if (!topicMap.containsKey(packet.getTopicID())) return;
 
-        vboxTopics.getChildren().clear();
+            Topic topic = topicMap.get(packet.getTopicID()).second().getTopic();
+
+            Set<Long> unexplored = topic.getTypingUsersReadOnly().stream().map(User::getUserID).collect(Collectors.toSet());
+
+            for (LongData typingMember : packet.getTypingMembers()) {
+                topic.addTypingUser(Connection.getInstance().getUser(typingMember.getValue()));
+                unexplored.remove(typingMember.getValue());
+            }
+
+            for (Long userID : unexplored) {
+                topic.removeTypingUser(Connection.getInstance().getUser(userID));
+            }
+        });
     }
 
     private void fetchTopicMessage(Topic topic, long messageID) {
@@ -265,6 +299,45 @@ public class MainController implements Initializable {
         Connection.getInstance().sendPacket(packet);
     }
 
+    @FXML
+    void onToggleDebug(MouseEvent event) {
+        recordDebugStats = !recordDebugStats;
+
+        lblDebug.setVisible(recordDebugStats);
+
+        Connection.getInstance().setRecordStats(recordDebugStats);
+        Connection.getInstance().updateConnectionStats();
+        Connection.getInstance().updateCacheStats();
+    }
+
+    @FXML
+    void onDebugEnter(MouseEvent event) {
+        lblDebug.setOpacity(0.9);
+    }
+
+    @FXML
+    void onDebugLeave(MouseEvent event) {
+        lblDebug.setOpacity(0.2);
+    }
+
+    private void rebuildDebugStatText() {
+        StringBuilder sb = new StringBuilder();
+
+        sb.append(Connection.getInstance().getCompiledConnectionStats()).append("\n");
+        sb.append(Connection.getInstance().getCompiledCacheStats()).append("\n");
+
+        sb.append("STATS\n");
+        sb.append("Total Messages (Downloaded): ").append(topicMap.values().stream()
+                .map(Pair::second)
+                .map(MainChatController::getTopic)
+                .map(Topic::getMessagesReadOnly)
+                .map(List::size)
+                .reduce(Integer::sum)
+                .orElse(0));
+
+        lblDebug.setText(sb.toString());
+    }
+
     public static Pair<Parent, MainController> createInstance() {
         return Utils.createInstance("views/main-view.fxml");
     }

Client/src/main/java/dev/wiing/gossip/client/data/UserAvatar.java

@@ -11,16 +11,16 @@ import java.util.Arrays;
 
 public class UserAvatar {
 
-    public static final UserAvatar MORNING = new UserAvatar("Morning", "Eggs and Bacon", 0, "avatars/avatar-0.png");
+    public static final UserAvatar MORNING = new UserAvatar("Morning", "Eggs and Bacon", 0, "#facb01", "avatars/avatar-0.png");
-    public static final UserAvatar VINTAGE = new UserAvatar("Vintage", "Red Car", 1, "avatars/avatar-1.png");
+    public static final UserAvatar VINTAGE = new UserAvatar("Vintage", "Red Car", 1, "#dd2046", "avatars/avatar-1.png");
-    public static final UserAvatar ROUTINE = new UserAvatar("Routine", "Coffee Cup", 2, "avatars/avatar-2.png");
+    public static final UserAvatar ROUTINE = new UserAvatar("Routine", "Coffee Cup", 2, "#01b4da", "avatars/avatar-2.png");
-    public static final UserAvatar SILLY = new UserAvatar("Silly", "Ghost Toy", 3, "avatars/avatar-3.png");
+    public static final UserAvatar SILLY = new UserAvatar("Silly", "Ghost Toy", 3, "#8f58d8", "avatars/avatar-3.png");
-    public static final UserAvatar ADVENTURE = new UserAvatar("Adventure", "Slide with a Plant", 4, "avatars/avatar-4.png");
+    public static final UserAvatar ADVENTURE = new UserAvatar("Adventure", "Slide with a Plant", 4, "#6bc7da", "avatars/avatar-4.png");
-    public static final UserAvatar REBELLION = new UserAvatar("Rebellion", "Potted Cactus", 5, "avatars/avatar-5.png");
+    public static final UserAvatar REBELLION = new UserAvatar("Rebellion", "Potted Cactus", 5, "#17b479", "avatars/avatar-5.png");
-    public static final UserAvatar DIGITAL = new UserAvatar("Digital", "Game Controller", 6, "avatars/avatar-6.png");
+    public static final UserAvatar DIGITAL = new UserAvatar("Digital", "Game Controller", 6, "#c3c1cf", "avatars/avatar-6.png");
-    public static final UserAvatar MYSTERY = new UserAvatar("Mystery", "Floating Sphere", 7, "avatars/avatar-7.png");
+    public static final UserAvatar MYSTERY = new UserAvatar("Mystery", "Floating Sphere", 7, "#26badc", "avatars/avatar-7.png");
-    public static final UserAvatar VACATION = new UserAvatar("Vacation", "Cat under an Umbrella", 8, "avatars/avatar-8.png");
+    public static final UserAvatar VACATION = new UserAvatar("Vacation", "Cat under an Umbrella", 8, "#f994fb", "avatars/avatar-8.png");
-    public static final UserAvatar SIMPLE = new UserAvatar("Simple", "Potted Succulent", 9, "avatars/avatar-9.png");
+    public static final UserAvatar SIMPLE = new UserAvatar("Simple", "Potted Succulent", 9, "#ff7e29", "avatars/avatar-9.png");
 
     public static UserAvatar getAvatar(int avatarID) {
         return Arrays.stream(getAvatars())
@@ -47,12 +47,14 @@ public class UserAvatar {
     private final String name;
     private final String description;
     private final int id;
+    private final String color;
     private final URL url;
 
-    private UserAvatar(String name, String description, int id, String path) {
+    private UserAvatar(String name, String description, int id, String color, String path) {
         this.name = name;
         this.description = description;
         this.id = id;
+        this.color = color;
         this.url = Program.class.getResource(path);
     }
 
@@ -68,6 +70,10 @@ public class UserAvatar {
         return id;
     }
 
+    public String getColor() {
+        return color;
+    }
+
     public URL getUrl() {
         return url;
     }

Client/src/main/resources/dev/wiing/gossip/client/views/avatar-view.fxml

@@ -1,27 +1,83 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
+<?import java.lang.String?>
 <?import java.net.URL?>
+<?import javafx.geometry.Insets?>
+<?import javafx.scene.control.Button?>
 <?import javafx.scene.control.Label?>
+<?import javafx.scene.control.ScrollPane?>
 <?import javafx.scene.layout.FlowPane?>
+<?import javafx.scene.layout.HBox?>
 <?import javafx.scene.layout.Pane?>
 <?import javafx.scene.layout.VBox?>
 
-
+<VBox fx:id="vboxRoot" alignment="CENTER" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="621.0" spacing="16.0" styleClass="gradient" xmlns="http://javafx.com/javafx/21" xmlns:fx="http://javafx.com/fxml/1" fx:controller="dev.wiing.gossip.client.controllers.AvatarController">
-<VBox alignment="CENTER" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" styleClass="gradient" xmlns="http://javafx.com/javafx/20.0.1" xmlns:fx="http://javafx.com/fxml/1">
+   <children>
+      <VBox alignment="CENTER" spacing="16.0" VBox.vgrow="ALWAYS">
          <children>
             <Label style="-fx-font-size: 20;" styleClass="axis" text="Choose an Avatar" />
-      <FlowPane prefHeight="200.0" prefWidth="200.0">
+            <Button fx:id="btnSave" mnemonicParsing="false" styleClass="axis" text="Save" />
+            <ScrollPane fitToWidth="true" hbarPolicy="NEVER" vbarPolicy="ALWAYS" VBox.vgrow="ALWAYS">
+               <styleClass>
+                  <String fx:value="container" />
+                  <String fx:value="list" />
+                  <String fx:value="transparent" />
+               </styleClass>
+               <VBox.margin>
+                  <Insets left="11.0" />
+               </VBox.margin>
+               <padding>
+                  <Insets left="8.0" right="8.0" />
+               </padding>
+               <content>
+                  <FlowPane fx:id="flowAvatars" alignment="CENTER" columnHalignment="CENTER" hgap="16.0" prefWrapLength="0.0" vgap="16.0">
                      <children>
-            <VBox prefHeight="200.0" prefWidth="100.0">
+                        <VBox fx:id="vboxAvatarButton" alignment="CENTER" spacing="16.0">
                            <children>
                               <Pane maxHeight="64.0" maxWidth="64.0" minHeight="64.0" minWidth="64.0" />
+                              <Label text="AvatarName">
+                                 <styleClass>
+                                    <String fx:value="axis" />
+                                    <String fx:value="accent" />
+                                 </styleClass>
+                              </Label>
                            </children>
                         </VBox>
                      </children>
                   </FlowPane>
+               </content>
+            </ScrollPane>
+         </children>
+      </VBox>
+      <HBox alignment="CENTER" spacing="16.0">
+         <children>
+            <Pane fx:id="paneSelectedIcon" maxHeight="96.0" maxWidth="96.0" minHeight="96.0" minWidth="96.0" />
+            <VBox alignment="CENTER_LEFT" HBox.hgrow="ALWAYS">
+               <children>
+                  <Label text="Selected">
+                     <styleClass>
+                        <String fx:value="axis" />
+                        <String fx:value="faint" />
+                     </styleClass>
+                  </Label>
+                  <Label fx:id="lblSelectedName" style="-fx-font-size: 16;" text="AvatarName">
+                     <styleClass>
+                        <String fx:value="axis" />
+                        <String fx:value="accent" />
+                     </styleClass>
+                  </Label>
+                  <Label fx:id="lblSelectedDesc" style="-fx-font-size: 14;" text="Description" />
+               </children>
+            </VBox>
+         </children>
+      </HBox>
    </children>
    <stylesheets>
       <URL value="@../styling.css" />
       <URL value="@../custom.css" />
+      <URL value="@../scroll.css" />
    </stylesheets>
+   <padding>
+      <Insets bottom="16.0" left="16.0" right="16.0" top="16.0" />
+   </padding>
 </VBox>

Client/src/main/resources/dev/wiing/gossip/client/views/chat-view.fxml

@@ -15,7 +15,7 @@
 <?import javafx.scene.layout.VBox?>
 <?import javafx.scene.shape.Circle?>
 
-<AnchorPane prefHeight="318.0" prefWidth="523.0" xmlns="http://javafx.com/javafx/20.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="dev.wiing.gossip.client.controllers.MainChatController">
+<AnchorPane prefHeight="318.0" prefWidth="523.0" xmlns="http://javafx.com/javafx/21" xmlns:fx="http://javafx.com/fxml/1" fx:controller="dev.wiing.gossip.client.controllers.MainChatController">
    <children>
       <VBox fx:id="vboxVisitPage" alignment="CENTER" layoutX="10.0" layoutY="10.0" spacing="8.0" visible="false" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
          <children>
@@ -88,7 +88,7 @@
                         <String fx:value="list" />
                      </styleClass>
                      <children>
-                        <TextArea fx:id="txtCompose" maxHeight="1.7976931348623157E308" minHeight="1.0" prefHeight="25.0" prefRowCount="1" promptText="Compose..." styleClass="transparent" wrapText="true" HBox.hgrow="ALWAYS" />
+                        <TextArea fx:id="txtCompose" maxHeight="1.7976931348623157E308" minHeight="1.0" onKeyPressed="#onKeyPressed" onKeyTyped="#onKeyTyped" prefHeight="25.0" prefRowCount="1" promptText="Compose..." styleClass="transparent" wrapText="true" HBox.hgrow="ALWAYS" />
                         <ImageView fitHeight="20.0" fitWidth="20.0" onMouseClicked="#onSend" opacity="0.5" pickOnBounds="true" preserveRatio="true">
                            <image>
                               <Image url="@../icons/icon-send-2.png" />

Client/src/main/resources/dev/wiing/gossip/client/views/login-view.fxml

@@ -12,7 +12,7 @@
 <?import javafx.scene.layout.HBox?>
 <?import javafx.scene.layout.VBox?>
 
-<VBox alignment="CENTER" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" spacing="16.0" styleClass="gradient" xmlns="http://javafx.com/javafx/20.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="dev.wiing.gossip.client.controllers.LoginController">
+<VBox fx:id="vboxRoot" alignment="CENTER" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" spacing="16.0" styleClass="gradient" xmlns="http://javafx.com/javafx/21" xmlns:fx="http://javafx.com/fxml/1" fx:controller="dev.wiing.gossip.client.controllers.LoginController">
    <stylesheets>
       <URL value="@../styling.css" />
       <URL value="@../scroll.css" />
@@ -32,7 +32,7 @@
       </Label>
       <HBox alignment="CENTER" spacing="16.0" VBox.vgrow="ALWAYS">
          <children>
-            <AnchorPane fx:id="paneIcon" maxHeight="64.0" maxWidth="64.0" minHeight="64.0" minWidth="64.0" onMouseClicked="#onChangeIcon" onMouseEntered="#onIconMouseEnter" onMouseExited="#onIconMouseExit" style="-fx-background-color: white;">
+            <AnchorPane fx:id="paneIcon" maxHeight="64.0" maxWidth="64.0" minHeight="64.0" minWidth="64.0" onMouseClicked="#onChangeIcon" onMouseEntered="#onIconMouseEnter" onMouseExited="#onIconMouseExit" style="-fx-background-color: white;" styleClass="clickable">
                <children>
                   <HBox fx:id="hboxEditOverlay" alignment="CENTER" mouseTransparent="true" opacity="0.0" style="-fx-background-color: #0006;" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
                      <children>

Client/src/main/resources/dev/wiing/gossip/client/views/main-view.fxml

@@ -17,7 +17,10 @@
 <?import javafx.scene.layout.VBox?>
 <?import javafx.scene.shape.Circle?>
 
-<VBox fx:id="vboxRoot" alignment="TOP_RIGHT" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="486.0" prefWidth="750.0" spacing="16.0" style="-accent: hsb(0, 0%, 50%);;" styleClass="gradient" xmlns="http://javafx.com/javafx/20.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="dev.wiing.gossip.client.controllers.MainController">
+
+<AnchorPane stylesheets="@../styling.css" xmlns="http://javafx.com/javafx/21" xmlns:fx="http://javafx.com/fxml/1" fx:controller="dev.wiing.gossip.client.controllers.MainController">
+   <children>
+      <VBox fx:id="vboxRoot" alignment="TOP_RIGHT" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="486.0" prefWidth="750.0" spacing="16.0" style="-accent: hsb(0, 0%, 50%);;" styleClass="gradient" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
          <stylesheets>
             <URL value="@../styling.css" />
             <URL value="@../scroll.css" />
@@ -26,7 +29,7 @@
          <children>
             <HBox>
                <children>
-            <ImageView blendMode="OVERLAY" fitHeight="30.0" fitWidth="200.0" pickOnBounds="true" preserveRatio="true">
+                  <ImageView blendMode="OVERLAY" fitHeight="30.0" fitWidth="200.0" onMouseClicked="#onToggleDebug" onMouseEntered="#onDebugEnter" onMouseExited="#onDebugLeave" pickOnBounds="true" preserveRatio="true">
                      <image>
                         <Image url="@../logo.png" />
                      </image>
@@ -270,11 +273,26 @@
                      </children>
                      <padding>
                         <Insets left="16.0" />
-               </padding></AnchorPane>
+                     </padding>
+                  </AnchorPane>
               </items>
             </SplitPane>
          </children>
          <padding>
             <Insets bottom="16.0" left="16.0" right="16.0" top="16.0" />
          </padding>
-</VBox>
+      </VBox>
+      <VBox alignment="BOTTOM_RIGHT" mouseTransparent="true" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
+         <children>
+            <Label fx:id="lblDebug" alignment="BOTTOM_RIGHT" opacity="0.2" style="-fx-background-color: #000f;" styleClass="border-radius-small" text="Debug" visible="false">
+               <padding>
+                  <Insets bottom="8.0" left="8.0" right="8.0" top="8.0" />
+               </padding>
+            </Label>
+         </children>
+         <padding>
+            <Insets bottom="16.0" left="16.0" right="16.0" top="16.0" />
+         </padding>
+      </VBox>
+   </children>
+</AnchorPane>

Lib/src/main/java/dev/wiing/gossip/lib/PacketHandler.java

@@ -8,8 +8,23 @@ import java.util.stream.Collectors;
 
 public class PacketHandler {
 
+    private final Map<Class<? extends Packet>, Packet> packetClassMap = new HashMap<>();
+
     private final Map<Class<? extends Packet>, Set<PacketListener<? extends Packet>>> listeners = new ConcurrentHashMap<>();
 
+    public void clearPacketMap() {
+        packetClassMap.clear();
+    }
+
+    public void addPacketToMap(Packet packet) {
+        packetClassMap.put(packet.getClass(), packet);
+    }
+
+    public void addAllPacketsToMap(Collection<Packet> packets) {
+        packetClassMap.putAll(packets.stream()
+                .collect(Collectors.toMap(Packet::getClass, o -> o)));
+    }
+
     public <T extends Packet> void addListener(Class<T> type, PacketListener<T> listener) {
         if (!listeners.containsKey(type)) {
             listeners.put(type, new HashSet<>());
@@ -39,35 +54,25 @@ public class PacketHandler {
     }
 
     public boolean runPacket(Packet packet) {
-        return switch (packet.getType()) {
+        return runPacket((Class<Packet>)packet.getClass(), packet);
-            case TopicCreatedPacket.TYPE -> runPacket(TopicCreatedPacket.class, (TopicCreatedPacket) packet);
-            case TopicUpdatePacket.TYPE -> runPacket(TopicUpdatePacket.class, (TopicUpdatePacket) packet);
-            case TopicListDataPacket.TYPE -> runPacket(TopicListDataPacket.class, (TopicListDataPacket) packet);
-            case MessageCreatedPacket.TYPE -> runPacket(MessageCreatedPacket.class, (MessageCreatedPacket) packet);
-            case MessageSystemPacket.TYPE -> runPacket(MessageSystemPacket.class, (MessageSystemPacket) packet);
-            default -> false;
-        };
     }
 
     public <T extends Packet> Set<PacketListener<T>> getListeners(Class<T> packetClass) {
         if (!listeners.containsKey(packetClass))
             return null;
 
-        return listeners.get(packetClass).stream().map(listener -> {
+        return listeners.get(packetClass).stream()
-            return (PacketListener<T>) listener;
+                .map(listener -> (PacketListener<T>) listener)
-        }).collect(Collectors.toSet());
+                .collect(Collectors.toSet());
     }
 
     public List<Short> getListeningTypes() {
-        return new ArrayList<>() {
+        return listeners.entrySet().stream()
-            {
+                .filter(classSetEntry -> !classSetEntry.getValue().isEmpty())
-                add(TopicCreatedPacket.TYPE);
+                .map(Map.Entry::getKey)
-                add(TopicUpdatePacket.TYPE);
+                .map(packetClassMap::get)
-                add(TopicListDataPacket.TYPE);
+                .map(Packet::getType)
-                add(MessageCreatedPacket.TYPE);
+                .collect(Collectors.toList());
-                add(MessageSystemPacket.TYPE);
-            }
-        };
     }
 
 }

Lib/src/main/java/dev/wiing/gossip/lib/PacketManager.java

@@ -4,10 +4,7 @@ import dev.wiing.gossip.lib.packets.*;
 
 import java.io.*;
 import java.nio.ByteBuffer;
-import java.util.ArrayList;
+import java.util.*;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
 
 public class PacketManager {
 
@@ -38,9 +35,14 @@ public class PacketManager {
             add(new MessageListDataPacket());
             add(new MessageFetchPacket());
             add(new MessageDataPacket());
+
+            add(new TypingPingPacket());
+            add(new TypingListUpdatePacket());
         }
     };
 
+    private final PacketMetrics packetMetrics = new PacketMetrics();
+
     private final Map<Short, Packet> packetMap = new HashMap<>();
 
     public void addPacket(Packet packet) {
@@ -58,6 +60,14 @@ public class PacketManager {
         }
     }
 
+    public Map<Short, Packet> getPacketMap() {
+        return Collections.unmodifiableMap(packetMap);
+    }
+
+    public PacketMetrics getPacketMetrics() {
+        return packetMetrics;
+    }
+
     public Packet readPacket(InputStream stream) throws IOException {
         ByteBuffer buffer = ByteBuffer.wrap(stream.readNBytes(6));
 
@@ -68,9 +78,14 @@ public class PacketManager {
 
         Packet packet = packetMap.getOrDefault(type, null);
 
-        if (packet == null) return null;
+        if (packet == null) {
+            packetMetrics.recordUnrecognisedPacket();
+            return null;
+        }
 
-        return packet.readBytes(ByteBuffer.wrap(stream.readNBytes(size)), size);
+        Packet result = packet.readBytes(ByteBuffer.wrap(stream.readNBytes(size)), size);
+        packetMetrics.recordReceivedPacket(result);
+        return result;
     }
 
     public void writePacket(BufferedOutputStream stream, Packet packet) throws IOException {
@@ -82,6 +97,8 @@ public class PacketManager {
         packet.writeBytes(buffer);
 
         stream.write(buffer.array());
+
+        packetMetrics.recordSentPacket(packet);
     }
 
     public void writePacket(OutputStream stream, Packet packet) throws IOException {

Lib/src/main/java/dev/wiing/gossip/lib/PacketMetrics.java

@@ -0,0 +1,74 @@
+package dev.wiing.gossip.lib;
+
+import dev.wiing.gossip.lib.packets.Packet;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class PacketMetrics {
+
+    private final Map<Class<Packet>, List<Packet>> sendHistory = new ConcurrentHashMap<>();
+    private int totalPacketsSentCount = 0;
+    private long totalPacketsSentBytes = 0;
+
+    private final Map<Class<Packet>, List<Packet>> receiveHistory = new ConcurrentHashMap<>();
+    private int totalPacketsReceivedCount = 0;
+    private long totalPacketsReceivedBytes = 0;
+
+    private int totalPacketsUnrecognised = 0;
+
+    public PacketMetrics() {
+
+    }
+
+    public void recordSentPacket(Packet packet) {
+        if (!sendHistory.containsKey(packet.getClass())) {
+            sendHistory.put((Class<Packet>) packet.getClass(), Collections.synchronizedList(new ArrayList<>()));
+        }
+
+        sendHistory.get(packet.getClass()).add(packet);
+        ++totalPacketsSentCount;
+        totalPacketsSentBytes += packet.getTotalLength();
+    }
+
+    public void recordReceivedPacket(Packet packet) {
+        if (!receiveHistory.containsKey(packet.getClass())) {
+            receiveHistory.put((Class<Packet>) packet.getClass(), Collections.synchronizedList(new ArrayList<>()));
+        }
+
+        receiveHistory.get(packet.getClass()).add(packet);
+        ++totalPacketsReceivedCount;
+        totalPacketsReceivedBytes += packet.getTotalLength();
+    }
+
+    public void recordUnrecognisedPacket() {
+        ++totalPacketsUnrecognised;
+    }
+
+    public Map<Class<Packet>, List<Packet>> getSendHistory() {
+        return Collections.unmodifiableMap(sendHistory);
+    }
+
+    public int getTotalPacketsSentCount() {
+        return totalPacketsSentCount;
+    }
+
+    public long getTotalPacketsSentBytes() {
+        return totalPacketsSentBytes;
+    }
+
+    public Map<Class<Packet>, List<Packet>> getReceiveHistory() {
+        return Collections.unmodifiableMap(receiveHistory);
+    }
+
+    public int getTotalPacketsReceivedCount() {
+        return totalPacketsReceivedCount;
+    }
+
+    public long getTotalPacketsReceivedBytes() {
+        return totalPacketsReceivedBytes;
+    }
+}

Lib/src/main/java/dev/wiing/gossip/lib/models/Topic.java

@@ -18,6 +18,8 @@ public class Topic {
     private final List<Message> messages = Collections.synchronizedList(new ArrayList<>());
     private final Map<Long, Message> messageByIDs = new ConcurrentHashMap<>();
 
+    private final Set<User> typingUsers = Collections.synchronizedSet(new HashSet<>());
+
     private long messageTrackerID = 1;
 
     public Topic(long id, String name, String description, User host, short color) {
@@ -101,6 +103,30 @@ public class Topic {
         this.changeSupport.firePropertyChange("messageAdd", null, message);
     }
 
+    public Set<User> getTypingUsersReadOnly() {
+        return Collections.unmodifiableSet(typingUsers);
+    }
+
+    public int getTypingUsersCount() {
+        return typingUsers.size();
+    }
+
+    public void addTypingUser(User user) {
+        if (typingUsers.contains(user)) return;
+
+        typingUsers.add(user);
+
+        this.changeSupport.firePropertyChange("typingAdd", null, user);
+    }
+
+    public void removeTypingUser(User user) {
+        if (!typingUsers.contains(user)) return;
+
+        typingUsers.remove(user);
+
+        this.changeSupport.firePropertyChange("typingRemove", null, user);
+    }
+
     public Message getMessageByID(long messageID) {
         return messageByIDs.getOrDefault(messageID, null);
     }

Lib/src/main/java/dev/wiing/gossip/lib/packets/TypingListUpdatePacket.java

@@ -0,0 +1,59 @@
+package dev.wiing.gossip.lib.packets;
+
+import dev.wiing.gossip.lib.data.ListData;
+import dev.wiing.gossip.lib.data.LongData;
+
+import java.nio.ByteBuffer;
+import java.util.List;
+
+public class TypingListUpdatePacket extends Packet {
+
+    public static final short TYPE = 0x42;
+    public static final int LENGTH = 0x000;
+
+    private long topicID;
+    private final ListData<LongData> typingMembers = new ListData<>(LongData::new);
+
+    public TypingListUpdatePacket() {
+        super(TYPE, LENGTH);
+    }
+
+    private void updateLength() {
+        setLength(8 + typingMembers.getLength());
+    }
+
+    @Override
+    public int getLength() {
+        updateLength();
+        return super.getLength();
+    }
+
+    public long getTopicID() {
+        return topicID;
+    }
+
+    public void setTopicID(long topicID) {
+        this.topicID = topicID;
+    }
+
+    public List<LongData> getTypingMembers() {
+        return typingMembers.getData();
+    }
+
+    @Override
+    public Packet readBytes(ByteBuffer buffer, int size) {
+        TypingListUpdatePacket packet = new TypingListUpdatePacket();
+        packet.setLength(size);
+
+        packet.topicID = buffer.getLong();
+        packet.typingMembers.setBytes(buffer);
+
+        return packet;
+    }
+
+    @Override
+    public void writeBytes(ByteBuffer buffer) {
+        buffer.putLong(topicID);
+        buffer.put(typingMembers.getBytes());
+    }
+}

Lib/src/main/java/dev/wiing/gossip/lib/packets/TypingPingPacket.java

@@ -0,0 +1,52 @@
+package dev.wiing.gossip.lib.packets;
+
+import dev.wiing.gossip.lib.data.AuthSecret;
+
+import java.nio.ByteBuffer;
+
+public class TypingPingPacket extends AuthRequiredPacket {
+
+    public static final short TYPE = 0x41;
+    public static final int LENGTH = 0x029;
+
+    private long topicID;
+    private boolean typing;
+
+    public TypingPingPacket() {
+        super(TYPE, LENGTH);
+    }
+
+    public long getTopicID() {
+        return topicID;
+    }
+
+    public void setTopicID(long topicID) {
+        this.topicID = topicID;
+    }
+
+    public boolean isTyping() {
+        return typing;
+    }
+
+    public void setTyping(boolean typing) {
+        this.typing = typing;
+    }
+
+    @Override
+    public Packet readBytes(ByteBuffer buffer, int size) {
+        TypingPingPacket packet = new TypingPingPacket();
+
+        packet.setAuth(new AuthSecret(buffer));
+        packet.topicID = buffer.getLong();
+        packet.typing = buffer.get() > 0;
+
+        return packet;
+    }
+
+    @Override
+    public void writeBytes(ByteBuffer buffer) {
+        buffer.put(getAuth().getBytes());
+        buffer.putLong(topicID);
+        buffer.put(typing ? (byte)1 : 0);
+    }
+}

Server/src/main/java/dev/wiing/gossip/server/Database.java

@@ -4,9 +4,11 @@ import dev.wiing.gossip.lib.data.AuthSecret;
 import dev.wiing.gossip.lib.models.SecretUser;
 import dev.wiing.gossip.lib.models.Topic;
 import dev.wiing.gossip.lib.models.User;
+import dev.wiing.gossip.server.customs.TypingTopic;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
+import java.io.IOException;
 import java.net.Socket;
 import java.security.SecureRandom;
 import java.util.*;
@@ -15,14 +17,14 @@ public class Database {
 
     private static final Logger logger = LogManager.getLogger(Database.class);
 
-    private int userIdCounter = 1;
+    private int channelIDCounter = 1;
     private final Map<Long, User> users = Collections.synchronizedMap(new HashMap<>());
     private final Map<String, User> usersBySecret = Collections.synchronizedMap(new HashMap<>());
     private final Map<Long, Socket> userSockets = Collections.synchronizedMap(new HashMap<>());
     private final Set<String> usedUsernames = Collections.synchronizedSet(new HashSet<>());
 
-    private int topicIdCounter = 1;
+    private final Map<Socket, User> connectedUsers = Collections.synchronizedMap(new HashMap<>());
-    private final Map<Long, Topic> topics = Collections.synchronizedMap(new HashMap<>());
+    private final Map<Long, TypingTopic> topics = Collections.synchronizedMap(new HashMap<>());
 
     private Database() {
 
@@ -41,7 +43,7 @@ public class Database {
         random.nextBytes(secretBytes);
         AuthSecret secret = new AuthSecret(secretBytes);
 
-        long userID = userIdCounter++;
+        long userID = channelIDCounter++;
 
         User user = new User(username, iconID, userID);
 
@@ -49,6 +51,7 @@ public class Database {
         userSockets.put(userID, socket);
         usersBySecret.put(secret.getString(), user);
         usedUsernames.add(username);
+        connectedUsers.put(socket, user);
 
         logger.info("User created: \"{}\" (#{})", user.getUsername(), user.getUserID());
 
@@ -79,12 +82,7 @@ public class Database {
     }
 
     public User getUserOfSocket(Socket socket) {
-        return userSockets.entrySet().stream()
+        return connectedUsers.get(socket);
-                .filter(entry -> entry.getValue().equals(socket))
-                .findFirst()
-                .map(Map.Entry::getKey)
-                .map(this::getUserByID)
-                .orElse(null);
     }
 
     public void removeUser(User user) {
@@ -96,22 +94,43 @@ public class Database {
                 .findFirst()
                 .ifPresent(usersBySecret::remove);
 
-        userSockets.remove(user.getUserID());
-
         usedUsernames.remove(user.getUsername());
 
+        disconnectUser(user);
+
         logger.info("User removed: \"{}\" (#{})", user.getUsername(), user.getUserID());
     }
 
-    public Topic createTopic(AuthSecret userSecret, String topicName, String topicDescription) {
+    public void disconnectUser(User user) {
+        Socket socket = null;
+
+        if (userSockets.containsKey(user.getUserID())) {
+            socket = userSockets.remove(user.getUserID());
+
+            if (socket != null && !socket.isClosed()) {
+                try {
+                    socket.close();
+                } catch (IOException ignored) {
+                }
+            }
+        }
+
+        if (socket != null) {
+            connectedUsers.remove(socket);
+
+            logger.info("User disconnected: \"{}\" (#{})", user.getUsername(), user.getUserID());
+        }
+    }
+
+    public TypingTopic createTopic(AuthSecret userSecret, String topicName, String topicDescription) {
         if (!usersBySecret.containsKey(userSecret.getString())) return null;
 
         User user = usersBySecret.get(userSecret.getString());
 
         short colorHue = (short)Math.abs((new Random().nextInt(360)));
 
-        Topic topic = new Topic(
+        TypingTopic topic = new TypingTopic(
-                topicIdCounter++,
+                channelIDCounter++,
                 topicName,
                 topicDescription,
                 user,
@@ -125,17 +144,17 @@ public class Database {
         return topic;
     }
 
-    public Topic getTopic(long topicID) {
+    public TypingTopic getTopic(long topicID) {
         return topics.getOrDefault(topicID, null);
     }
 
     public void removeTopic(long topicID) {
-        Topic topic = topics.remove(topicID);
+        TypingTopic topic = topics.remove(topicID);
 
         logger.info("Topic removed: \"{}\" (#{})", topic.getName(), topic.getId());
     }
 
-    public List<Topic> getAllTopicsReadOnly() {
+    public List<TypingTopic> getAllTopicsReadOnly() {
-        return Collections.unmodifiableList(topics.values().stream().toList());
+        return topics.values().stream().toList();
     }
 }

Server/src/main/java/dev/wiing/gossip/server/UserSocket.java

@@ -3,13 +3,13 @@ package dev.wiing.gossip.server;
 import dev.wiing.gossip.lib.data.LongData;
 import dev.wiing.gossip.lib.models.*;
 import dev.wiing.gossip.lib.packets.*;
+import dev.wiing.gossip.server.customs.TypingTopic;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 import java.io.IOException;
 import java.net.Socket;
 import java.net.SocketException;
-import java.util.List;
 
 public record UserSocket(Socket socket) implements Runnable {
 
@@ -72,6 +72,10 @@ public record UserSocket(Socket socket) implements Runnable {
                     case MessageFetchPacket.TYPE:
                         onFetchMessage((MessageFetchPacket) packet);
                         break;
+
+                    case TypingPingPacket.TYPE:
+                        onTypingUser((TypingPingPacket) packet);
+                        break;
                 }
             } catch (SocketException e) {
                 loop = false;
@@ -82,7 +86,7 @@ public record UserSocket(Socket socket) implements Runnable {
 
         // Connection lost
         User user = Database.getInstance().getUserOfSocket(socket);
-        Database.getInstance().removeUser(user);
+        Database.getInstance().disconnectUser(user);
     }
 
     private void onRegisterUser(RegisterRequestPacket packet) {
@@ -118,6 +122,8 @@ public record UserSocket(Socket socket) implements Runnable {
         for (User user : Database.getInstance().getUsers()) {
             Socket socket = Database.getInstance().getUserSocket(user.getUserID());
 
+            if (socket == null) continue;
+
             try {
                 Globals.getPacketManager().writePacket(socket.getOutputStream(), added);
             } catch (IOException e) {
@@ -162,6 +168,8 @@ public record UserSocket(Socket socket) implements Runnable {
         for (User user : Database.getInstance().getUsers()) {
             Socket socket = Database.getInstance().getUserSocket(user.getUserID());
 
+            if (socket == null) continue;
+
             try {
                 Globals.getPacketManager().writeAllPackets(socket.getOutputStream(), updatePacket, systemPacket);
             } catch (IOException e) {
@@ -259,6 +267,8 @@ public record UserSocket(Socket socket) implements Runnable {
         for (User babbler : topic.getUsersReadOnly().values()) {
             Socket userSocket = Database.getInstance().getUserSocket(babbler.getUserID());
 
+            if (userSocket == null) continue;
+
             try {
                 Globals.getPacketManager().writePacket(userSocket.getOutputStream(), messageCreated);
             } catch (IOException e) {
@@ -306,6 +316,7 @@ public record UserSocket(Socket socket) implements Runnable {
             resp.setMessageType(MessageDataPacket.MessageType.USER);
             resp.setUserAuthorID(userMessage.getAuthor().getUserID());
             resp.setUserContents(userMessage.getContents());
+
         } else if (message instanceof SystemMessage systemMessage) {
             resp.setMessageType(MessageDataPacket.MessageType.SYSTEM);
             resp.setSystemType(systemMessage.getType());
@@ -321,4 +332,68 @@ public record UserSocket(Socket socket) implements Runnable {
         }
     }
 
+    private void onTypingUser(TypingPingPacket packet) {
+        User user = Database.getInstance().getUserBySecret(packet.getAuth());
+
+        if (user == null) return;
+
+        TypingTopic topic = Database.getInstance().getTopic(packet.getTopicID());
+
+        if (topic == null || !topic.hasUser(user)) return;
+
+        if (packet.isTyping()) {
+            topic.addTypingUser(user);
+
+            if (topic.getTypingExpiry().containsKey(user)) topic.getTypingExpiry().get(user).interrupt();
+
+            Thread thread = new Thread(() -> {
+                try {
+                    Thread.sleep(20_000);
+                } catch (InterruptedException e) {
+                    return;
+                }
+
+                topic.removeTypingUser(user);
+
+                announceTypingList(topic);
+
+                topic.getTypingExpiry().remove(user);
+            });
+            thread.start();
+
+            topic.getTypingExpiry().put(user, thread);
+
+        } else {
+            topic.removeTypingUser(user);
+
+            Thread thread = topic.getTypingExpiry().remove(user);
+            if (thread != null && thread.isAlive()) thread.interrupt();
+        }
+
+        info("User #{} typing ping on #{}", user.getUserID(), topic.getId());
+
+        announceTypingList(topic);
+
+    }
+
+    private static void announceTypingList(TypingTopic topic) {
+        TypingListUpdatePacket resp = new TypingListUpdatePacket();
+        resp.setTopicID(topic.getId());
+        resp.getTypingMembers().addAll(topic.getTypingUsersReadOnly().stream()
+                .map(typing -> new LongData().setValue(typing.getUserID()))
+                .toList());
+
+        for (User babbler : topic.getUsersReadOnly().values()) {
+            Socket userSocket = Database.getInstance().getUserSocket(babbler.getUserID());
+
+            if (userSocket == null) continue;
+
+            try {
+                Globals.getPacketManager().writePacket(userSocket.getOutputStream(), resp);
+            } catch (IOException e) {
+                logger.error(e);
+            }
+        }
+    }
+
 }

Server/src/main/java/dev/wiing/gossip/server/customs/TypingTopic.java

@@ -0,0 +1,22 @@
+package dev.wiing.gossip.server.customs;
+
+import dev.wiing.gossip.lib.models.Topic;
+import dev.wiing.gossip.lib.models.User;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class TypingTopic extends Topic {
+
+    private final Map<User, Thread> typingExpiry = new ConcurrentHashMap<>();
+
+    public TypingTopic(long id, String name, String description, User host, short color) {
+        super(id, name, description, host, color);
+    }
+
+    public Map<User, Thread> getTypingExpiry() {
+        return typingExpiry;
+    }
+}