isDuplicateKeyException example

    public function save(Key $key)
    {
        $key->reduceLifetime($this->initialTtl);

        try {
            $this->upsert($key, $this->initialTtl);
        } catch (WriteException $e) {
            if ($this->isDuplicateKeyException($e)) {
                throw new LockConflictedException('Lock was acquired by someone else.', 0, $e);
            }
            throw new LockAcquiringException('Failed to acquire lock.', 0, $e);
        }

        if ($this->options['gcProbability'] > 0.0 && (1.0 === $this->options['gcProbability'] || (random_int(0, \PHP_INT_MAX) / \PHP_INT_MAX) <= $this->options['gcProbability'])) {
            $this->createTtlIndex();
        }

        $this->checkNotExpired($key);
    }