@SuppressWarnings("unchecked")
    K castKey = (K) key;
    alertListenerIfPresent(castKey, value.getValue(), RemovalCause.EXPIRED);
    return null;
  }

  private V getOrLoad(K key) throws ExecutionException {
    synchronized (lock) {
      V value = get(key);
      if (value != null) {
        return value;
      }
      return load(key);
    }
  }