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[core] make forcing cache/network only more explicit
Previously, we used the existence of a `prior*` field in the Resource object as an indication for whether we should consult the cache or not. However, this is prone to error, since a failed cache lookup won't set any prior fields. Therefore, we manually set `priorExpires` to 0. This in turn triggered another bug where generated wrong expiration timestamps when the server response we got was expired (or expired between sending and receiving). This commit changes the flags so that we can now explicitly request CacheOnly/NetworkOnly (or All) loading methods, rather than the implicit Optional/Required naming scheme.
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Original file line number | Diff line number | Diff line change |
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#pragma once | ||
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namespace mbgl { | ||
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// Tiles can have two states: optional or required. | ||
// - optional means that only low-cost actions should be taken to obtain the data | ||
// (e.g. load from cache, but accept stale data) | ||
// - required means that every effort should be taken to obtain the data (e.g. load | ||
// from internet and keep the data fresh if it expires) | ||
enum class TileNecessity : bool { | ||
Optional = false, | ||
Required = true, | ||
}; | ||
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} // namespace mbgl |
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