class MemcacheClientWrapper extends AbstractMemcacheClientWrapper {

    @Override
    public boolean add(final String key, final int exp, final Object value) throws TimeoutException, CacheException {
        Future<Boolean> f = null;
        try {
            f = memcachedClient.add(key, exp, value);
            return f.get();
        } catch (InterruptedException | ExecutionException e) {
            cancel(f);
            throw new CacheException(e);
        }
    }

      MemcacheClientWrapper(final MemcachedClientIF memcachedClient);

}