From 1e3a744d2296feb2fd6b5d7da324bb31b6ee17c6 Mon Sep 17 00:00:00 2001
From: Huyen Chau Nguyen <hello@chau-nguyen.de>
Date: Wed, 17 Oct 2018 20:12:28 +0200
Subject: [core] add priorities to resources

- priorities can be low or regular
- offline downloads should have low priority to not throttle "regular requests"
---
 include/mbgl/storage/resource.hpp | 26 +++++++++++++++++++-------
 1 file changed, 19 insertions(+), 7 deletions(-)

(limited to 'include')

diff --git a/include/mbgl/storage/resource.hpp b/include/mbgl/storage/resource.hpp
index 318fa389f4..97b9fbcaf0 100644
--- a/include/mbgl/storage/resource.hpp
+++ b/include/mbgl/storage/resource.hpp
@@ -24,6 +24,11 @@ public:
         Image
     };
 
+    enum class Priority : bool {
+        Regular,
+        Low
+    };
+
     struct TileData {
         std::string urlTemplate;
         uint8_t pixelRatio;
@@ -44,34 +49,41 @@ public:
 
     Resource(Kind kind_,
              std::string url_,
+             Priority priority_ = Resource::Priority::Regular,
              optional<TileData> tileData_ = {},
              LoadingMethod loadingMethod_ = LoadingMethod::All)
         : kind(kind_),
           loadingMethod(loadingMethod_),
+          priority(priority_),
           url(std::move(url_)),
           tileData(std::move(tileData_)) {
     }
 
+    void setPriority(Priority p) { priority = p; }
+
     bool hasLoadingMethod(LoadingMethod method);
 
-    static Resource style(const std::string& url);
-    static Resource source(const std::string& url);
+    static Resource style(const std::string& url, const Priority priority = Resource::Priority::Regular);
+    static Resource source(const std::string& url, const Priority priority = Resource::Priority::Regular);
     static Resource tile(const std::string& urlTemplate,
                          float pixelRatio,
                          int32_t x,
                          int32_t y,
                          int8_t z,
                          Tileset::Scheme scheme,
+                         const Priority priority = Resource::Priority::Regular,
                          LoadingMethod = LoadingMethod::All);
     static Resource glyphs(const std::string& urlTemplate,
                            const FontStack& fontStack,
-                           const std::pair<uint16_t, uint16_t>& glyphRange);
-    static Resource spriteImage(const std::string& base, float pixelRatio);
-    static Resource spriteJSON(const std::string& base, float pixelRatio);
-    static Resource image(const std::string& url);
-    
+                           const std::pair<uint16_t, uint16_t>& glyphRange,
+                           const Priority priority = Resource::Priority::Regular);
+    static Resource spriteImage(const std::string& base, float pixelRatio, const Priority priority = Resource::Priority::Regular);
+    static Resource spriteJSON(const std::string& base, float pixelRatio, const Priority priority = Resource::Priority::Regular);
+    static Resource image(const std::string& url, const Priority priority = Resource::Priority::Regular);
+
     Kind kind;
     LoadingMethod loadingMethod;
+    Priority priority;
     std::string url;
 
     // Includes auxiliary data if this is a tile request.
-- 
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