code: public void addFilter(ClassNameFilter classNameFilter) {
          writeLock.lock();
          try {
              if (filters == null) {
                  filters = new ArrayList<ClassNameFilter>();
              }
              filters.add(classNameFilter);
              // 从小到大，先进优先
              Collections.sort(filters, new Comparator<ClassNameFilter>() {
                  public int compare(ClassNameFilter o1, ClassNameFilter o2) {
                      return o1.order() - o2.order();
                  }
              });
          } finally {
              writeLock.unlock();
          }
      }
docs: 增加类名过滤器
  
  @param classNameFilter 类名过滤器t