}

    /**
     * Executes an explain request asynchronously.
     *
     * @param request the explain request
     * @return a future for the explain response
     */
    @Override
    public ActionFuture<ExplainResponse> explain(final ExplainRequest request) {
        return client.explain(request);
    }

    /**
     * Executes an explain request asynchronously with a callback.
     *

at least I know who I WAS when I got up this morning, but I think
I must have been changed several times since then.'

  `What do you mean by that?' said the Caterpillar sternly.
`Explain yourself!'

  `I can't explain MYSELF, I'm afraid, sir' said Alice, `because
I'm not myself, you see.'

  `I don't see,' said the Caterpillar.

  `I'm afraid I can't put it more clearly,' Alice replied very