/** Stops this server. */
  @Override
  public void shutdown() {
    // Just in case this gets called twice
    if (isShuttingDown) {
      return;
    }
    isShuttingDown = true;
    logger.info("The server is shutting down...");

    // Disable plugins
    pluginManager.clearPlugins();

    // Kick all players (this saves their data too)
    for (Player player : getOnlinePlayers()) {
      player.kickPlayer(getShutdownMessage());
    }

    // Stop the network servers - starts the shutdown process
    // It may take a second or two for Netty to totally clean up
    networkServer.shutdown();
    if (queryServer != null) {
      queryServer.shutdown();
    }
    if (rconServer != null) {
      rconServer.shutdown();
    }

    // Save worlds
    for (World world : getWorlds()) {
      logger.info("Saving world: " + world.getName());
      unloadWorld(world, true);
    }

    // Stop scheduler and console
    scheduler.stop();
    consoleManager.stop();

    // Wait for a while and terminate any rogue threads
    new ShutdownMonitorThread().start();
  }
  @Override
  public OfflinePlayer[] getOfflinePlayers() {
    Set<OfflinePlayer> result = new HashSet<>();
    Set<UUID> uuids = new HashSet<>();

    // add the currently online players
    for (World world : getWorlds()) {
      for (Player player : world.getPlayers()) {
        result.add(player);
        uuids.add(player.getUniqueId());
      }
    }

    // add all offline players that aren't already online
    for (OfflinePlayer offline : getPlayerDataService().getOfflinePlayers()) {
      if (!uuids.contains(offline.getUniqueId())) {
        result.add(offline);
        uuids.add(offline.getUniqueId());
      }
    }

    return result.toArray(new OfflinePlayer[result.size()]);
  }