private function addAccumulativeEntry(
        EntryInterface $entry,
        $entryKey
    ) {
        $this->doRedisQuery(function () use ($entry, $entryKey) {
            $this
                ->redis
                ->incrby(
                    $entryKey . '_accum',
                    (int) $entry->getValue()
                );
        });

        return $this;
    }