synchronized @NotNull String getDescription() {
    if (myItems.isEmpty())
      return "empty_container";
    StringBuilder res = new StringBuilder(String.format("items [%d]: ", myItems.size()));
    for (TBItem item : myItems) {
      res.append(item.getUid());
      res.append(", ");
    }
    return res.toString();
  }
synchronized @NotNull String getDescription()