* constructed {@link Cache} as the delegate.
   *
   * @since 10.0
   */
  public abstract static class SimpleForwardingCache<K, V> extends ForwardingCache<K, V> {
    private final Cache<K, V> delegate;

    protected SimpleForwardingCache(Cache<K, V> delegate) {
      this.delegate = Preconditions.checkNotNull(delegate);
    }

    @Override

   * constructed {@link Cache} as the delegate.
   *
   * @since 10.0
   */
  public abstract static class SimpleForwardingCache<K, V> extends ForwardingCache<K, V> {
    private final Cache<K, V> delegate;

    protected SimpleForwardingCache(Cache<K, V> delegate) {
      this.delegate = Preconditions.checkNotNull(delegate);
    }

    @Override