@Override
      public void receivedStatus(OperationStatus status) {
        rv.set(status.isSuccess(), status);
      }
Touch the given key to reset its expiration time.

@param key the key to fetch
@param exp the new expiration to set for the given key
@param tc the transcoder to serialize and unserialize value
@return a future that will hold the return value of whether or not the
        fetch succeeded
@throws IllegalStateException in the rare circumstance where queue is too
          full to accept any more requests
src/main/java/net/spy/memcached/MemcachedClient.java