Discuss download manager for offline caching about mbxmapkit HOT 6 CLOSED

I like this idea.

One complicating thought though would be how to handle updating a cached map if the update doesn't complete before a network connection is lost. It would be bad to have a mix of old and new tiles in the cache, and you wouldn't want to clear the cache and risk having no tiles present either.

I'd love an atomic update capability that would download all the map tiles in a region to a certain depth, and only if the download fully succeeds then clear the cache and replace it with the new data.

The usage scenarios I have in mind are for apps that are used primarily offline or with very marginal net connectivity, and it is important to never break functionality if a user tries to update her maps and the connection fails or never finishes.

My current plan is to embed a starting map inside the apps via MBTiles, and I've been puzzling over how to allow for OTA updates without requiring a full new version of the app to be released. This might be a way.

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@radven, it sounds like you'd be fine with a cache manager that supported only a single region, and the critical feature you need is actually the ability to do an atomic update for that whole region. Is that right?

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I think only a single region would be fine - I'm trying to imagine cases it wouldn't be.

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does it need to support multiple separate, and possibly overlapping, regions in order to be useful

I would say no. The SDK has had the single region capability for a couple years and I've never heard of someone needing particular distinct regions within it (on a per-mapID basis, anyway).

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That works for me. I mentioned multiple regions because I have actually seen a use case for that, but I'm getting the sense it was not a situation which commonly occurs (i.e. it probably doesn't belong in MBXMapKit).

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Closing this in favor of #73

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