code: protected T read(String group, String id) {
          ConcurrentMap<String, T> subMap = map.get(group);
          for (Iterator<String> iterator2 = subMap.keySet().iterator(); iterator2.hasNext();) {
              String storedId = iterator2.next();
              if (id.equals(storedId)) {
                  return subMap.get(id);
              }
          }
          return null;
      }
docs: @warn method description missing
  @warn parameter descriptions missing
  
  @param group
  @param id
  @return