void set(ID<?, ?> id, long tmst) {
    if (tmst == IndexingStamp.INDEX_DATA_OUTDATED_STAMP && !myIndexStamps.containsKey(id)) {
      return;
    }

    long previous = tmst == IndexingStamp.HAS_NO_INDEXED_DATA_STAMP ? myIndexStamps.removeLong(id) : myIndexStamps.put(id, tmst);
    if (previous != tmst) {
      myIsDirty = true;
    }
  }
void set(ID<?, ?> id, long tmst)