TD-18: Implement Queue System

src/main/java/de/towerdefence/server/match/queue/FoundCallback.java

@@ -4,6 +4,7 @@ import de.towerdefence.server.player.Player;
 
 import java.io.IOException;
 
+@FunctionalInterface
 public interface FoundCallback {
     void call(Player player, String matchId, long created, long ttl) throws IOException;
 }

src/main/java/de/towerdefence/server/match/queue/QueuedCallback.java

@@ -4,6 +4,7 @@ import de.towerdefence.server.player.Player;
 
 import java.io.IOException;
 
+@FunctionalInterface
 public interface QueuedCallback {
     void call(Player player) throws IOException;
 }

src/main/java/de/towerdefence/server/server/channels/matchmaking/bi/MatchSetSearchStateMessage.java

@@ -16,6 +16,7 @@ import java.util.Map;
 public class MatchSetSearchStateMessage extends JsonMessage {
     public static final String MESSAGE_ID = "MatchSetSearchState";
 
+    @Getter
     @JsonProperty("$id")
     private String messageId;
 
@@ -25,11 +26,6 @@ public class MatchSetSearchStateMessage extends JsonMessage {
         this(MESSAGE_ID, searching);
     }
 
-    @Override
-    protected String getMessageId() {
-        return messageId;
-    }
-
     @Override
     protected Map<String, JsonNode> getData(JsonNodeFactory factory) {
         return Map.of(