}

    if (calculatedValue == null) {
      String message = loader + " returned null for key " + key + ".";
      throw new CacheLoader.InvalidCacheLoadException(message);
    }
    statsCounter.recordLoadSuccess(ticker.read() - startTime);
    return calculatedValue;
  }

  private @Nullable V getIfPresent(Object key) {
    checkNotNull(key);
    Timestamped<V> value;
    synchronized (lock) {