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authorKonstantin Käfer <mail@kkaefer.com>2017-10-09 12:59:27 +0200
committerKonstantin Käfer <mail@kkaefer.com>2017-10-12 10:41:49 +0200
commitf4cb3b8a4f70723f22d89b163160dc1a28d8d8a0 (patch)
treee41558bee74394c181664cf6047abad8a8cb7a2d /include/mbgl/tile
parent98a47884f06a8f165a2c15a54f82b356c8ef23d8 (diff)
downloadqtlocation-mapboxgl-f4cb3b8a4f70723f22d89b163160dc1a28d8d8a0.tar.gz
[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.
Diffstat (limited to 'include/mbgl/tile')
-rw-r--r--include/mbgl/tile/tile_necessity.hpp15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/mbgl/tile/tile_necessity.hpp b/include/mbgl/tile/tile_necessity.hpp
new file mode 100644
index 0000000000..e51bf51d10
--- /dev/null
+++ b/include/mbgl/tile/tile_necessity.hpp
@@ -0,0 +1,15 @@
+#pragma once
+
+namespace mbgl {
+
+// 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,
+};
+
+} // namespace mbgl