Polling a batch job via PHP library needs unnecessary upload URL?

I noticed in the PHP library, BatchJobUtils' constructor has a required $uploadUrl param. Isn't upload URL unnecessary when polling a batch job?

In my case, I am using a queue system to poll the batch job.

Since I can't get the upload URL using BatchJobService->get (Doc says "This field is only returned when calling BatchJobService.mutate with an ADD operation."),

it means that I have to store the redundant upload URL in my database. Please let me know if this is true.

Sample code for downloading batch job results:

    $batchJobUtils = new \BatchJobUtils($batchJob->uploadUrl->url);
    if ($batchJob->downloadUrl !== null && $batchJob->downloadUrl->url !== null) {
        $xmlResponse = $batchJobUtils->DownloadBatchJobResults($batchJob->downloadUrl->url);

    }

Reading the Java sample code, instead of BatchJobUtils it's BatchJobHelper. BatchJobHelper does not have the required upload URL param.

AdWordsSession session = new AdWordsSession.Builder().fromFile().withOAuth2Credential(oAuth2Credential).build();
BatchJobHelper batchJobHelper = new BatchJobHelper(session);
batchJobHelper.downloadBatchJobMutateResponse(batchJob.getDownloadUrl().getUrl());

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