public static void main(String[] args) {
    Quality quality = new Quality(105, 1);
    System.out.println(quality.getQualityValue());
    final ConcurrentHashMap<String, ConcurrentHashMap<String, Quality>> addrReqUrlQualities =
        new ConcurrentHashMap<String, ConcurrentHashMap<String, Quality>>();
    new Thread() {
      @Override
      public void run() {
        RequestQualityManager.INSTANCE.setAddrReqUrlQualities(addrReqUrlQualities);
      }
    }.start();

    try {
      Thread.sleep(3000);
    } catch (InterruptedException e) {
      logger.warn("[main] thread interupt", e);
    }
    System.out.println(RequestQualityManager.INSTANCE.getAddrReqUrlQualities());
  }