private void invalidateKeyHashToVirtualFileMappingCache() {
    int lastScannedId = myLastScannedId;
    if (lastScannedId != 0) { // we have write lock
      myInvalidatedSessionIds.putIfAbsent(lastScannedId, Boolean.TRUE);
      myLastScannedId = 0;
    }
  }
private void invalidateKeyHashToVirtualFileMappingCache()