feat: singleton MessageRelay and better prototype of LobbyManager

Server/src/main/java/uulm/teamname/marvelous/server/LobbyManager/LobbyConnection.java

@@ -1,8 +1,9 @@
 package uulm.teamname.marvelous.server.LobbyManager;
 
+import org.java_websocket.WebSocket;
+import uulm.teamname.marvelous.gamelibrary.events.Event;
 import uulm.teamname.marvelous.server.Lobby.Lobby;
 
-import java.net.http.WebSocket;
 import java.util.HashSet;
 
 /**
@@ -28,14 +29,14 @@ public class LobbyConnection {
      * @return whether there is a player1
      */
     public boolean hasPlayer1() {
-        return player1 == null;
+        return player1 != null;
     }
 
     /**
      * @return whether there is a player2
      */
     public boolean hasPlayer2() {
-        return player2 == null;
+        return player2 != null;
     }
 
     /**
@@ -96,4 +97,16 @@ public class LobbyConnection {
     public boolean contains(WebSocket webSocket) {
         return player1 == webSocket || player2 == webSocket || spectators.contains(webSocket);
     }
+
+    // Methods to send events
+
+    public void sendEvents(Event[] events, MessageSource target) {
+        // TODO: implement
+        MessageRelay.getInstance();
+    }
+
+    public void broadcastEvents(Event[] events) {
+        // TODO: implement
+        MessageRelay.getInstance();
+    }
 }

Server/src/main/java/uulm/teamname/marvelous/server/LobbyManager/MessageRelay.java

@@ -6,14 +6,24 @@ import uulm.teamname.marvelous.server.Lobby.Lobby;
 import java.util.HashMap;
 
 public class MessageRelay {
+
+    public static MessageRelay instance;
+
     private final HashMap<WebSocket, Lobby> lobbies;
     private final HashMap<Lobby, WebSocket> sockets;
 
-    public MessageRelay() {
+    private MessageRelay() {
         this.lobbies = new HashMap<>();
         this.sockets = new HashMap<>();
     }
 
+    public static MessageRelay getInstance() {
+        if (instance == null) {
+            instance = new MessageRelay();
+        }
+        return instance;
+    }
+
     public void relayMessage (WebSocket conn, String message) {
         var targetLobby = lobbies.get(conn);
         // TODO: Parse JSON