code: /*
   * Computoser is a music-composition algorithm and a website to present the results
   * Copyright (C) 2012-2014  Bozhidar Bozhanov
   *
   * Computoser is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Affero General Public License as
   * published by the Free Software Foundation, either version 3 of the
   * License, or (at your option) any later version.
   *
   * Computoser is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU Affero General Public License for more details.
   *
   * You should have received a copy of the GNU Affero General Public License
   * along with Computoser.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  package com.music.web;
  
  import java.security.Principal;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  import org.springframework.messaging.handler.annotation.MessageMapping;
  import org.springframework.stereotype.Controller;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.ResponseBody;
  
  import com.music.web.websocket.Game;
  
  @Controller
  @RequestMapping("/game")
  public class GameController {
  
      private Map<String, Game> games = new ConcurrentHashMap<>();
  
      @RequestMapping({"/", ""})
      public String gameIndex() {
          return "game";
      }
  
      @MessageMapping("/initialize")
      //@RequestMapping("/initialize")
      public String initialize(Principal principal) {
  
          return null; //game.getId();
      }
  
      private void addCurrentUser(Game game, Principal principal) {
          //game.getPlayers().add(principal.getName());
          //game.getAnswers().put(principal.getName(), new ArrayList<Integer>());
      }
  
      @MessageMapping("/join")
      @ResponseBody
      public void joinGame(String gameId, Principal principal) {
          Game game = games.get(gameId);
          if (game != null && !game.isStarted()) {
              addCurrentUser(game, principal);
          } else {
              // Game doesn't exist or is already started
          }
      }
  
      @RequestMapping("/nextPiece")
      public Long getNextPiece(String gameId) {
          return 0L;
      }
  
      @MessageMapping("/answer")
      public void answer(Long userId, String gameId, int bpm) {
          //games.get(gameId).getAnswers().get(userId).add(bpm);
      }
  }
  