public V load(K key) throws Exception {
        throw e;
      }
    };
  }

  /** Returns a {@link CacheLoader} that returns the key for every request. */
  static <T> IdentityLoader<T> identityLoader() {
    return new IdentityLoader<T>();
  }

  /**
   * Returns a {@code new Object()} for every request, and increments a counter for every request.
   * The count is accessible via {@link #getCount}.
   */