added a new 'ShutdownMessage' for the server

Projekte/mdga/client/src/main/java/pp/mdga/client/server/MdgaServer.java

@@ -130,6 +130,7 @@ private void initializeSerializables() {
         Serializer.registerClass(ReconnectBriefingMessage.class);
         Serializer.registerClass(ResumeGameMessage.class);
         Serializer.registerClass(ServerStartGameMessage.class);
+        Serializer.registerClass(ShutdownMessage.class);
         Serializer.registerClass(StartPieceMessage.class);
         Serializer.registerClass(UpdateReadyMessage.class);
         Serializer.registerClass(UpdateTSKMessage.class);

Projekte/mdga/model/src/main/java/pp/mdga/message/server/ServerInterpreter.java

@@ -207,4 +207,11 @@ public interface ServerInterpreter {
      * @param msg the SelectPiece message received.
      */
     void received(SelectPieceMessage msg);
+
+    /**
+     * Handles a SelectTSK message received from the server.
+     *
+     * @param shutdownMessage the SelectTSK message received.
+     */
+    void received(ShutdownMessage shutdownMessage);
 }

Projekte/mdga/model/src/main/java/pp/mdga/server/automaton/LobbyState.java

@@ -148,6 +148,9 @@ public void received(LobbyNotReadyMessage msg, int from) {
      */
     @Override
     public void received(LeaveGameMessage msg, int from) {
+        if (from == this.logic.getGame().getHost()) {
+            this.logic.getServerSender().broadcast(new ShutdownMessage());
+        }
         this.logic.getGame().removePlayer(from);
         this.logic.getServerSender().broadcast(new LobbyPlayerLeaveMessage(from));
         this.logic.getServerSender().disconnectClient(from);