code: @SuppressWarnings("unchecked")
    void rehash() {
      Entry<K,V>[] src = entries;
      if (src == null) {
        throw new CacheClosedException(cache);
      }
      int i, sl = src.length, n = sl * 2, _mask = n - 1, idx;
      Entry<K,V>[] tab = new Entry[n];
      long _count = 0; Entry _next, e;
      for (i = 0; i < sl; i++) {
        e = src[i];
        while (e != null) {
          _count++; _next = e.another; idx = modifiedHashCode(e.hashCode) & _mask;
          e.another = tab[idx]; tab[idx] = e;
          e = _next;
        }
      }
      entries = tab;
      calcMaxFill();
    }
docs: Double the hash table size and rehash the entries. Assumes total lock.