code: public Optional<Server> getPossiblyUnreadyServerById(long id) {
          if (nonReadyServers.containsKey(id)) {
              return Optional.ofNullable(nonReadyServers.get(id));
          }
          return Optional.ofNullable(servers.get(id));
      }
docs: Gets a server by it's id, including ready and not ready ones.
  
  @param id The of the server.
  @return The server with the given id.