1 files changed, 34 insertions, 3 deletions
diff --git a/platform/default/include/mbgl/storage/offline_database.hpp b/platform/default/include/mbgl/storage/offline_database.hpp
index 62a82f3a25..7eb546b3f6 100644
--- a/platform/default/include/mbgl/storage/offline_database.hpp
+++ b/platform/default/include/mbgl/storage/offline_database.hpp
@@ -3,7 +3,6 @@
 #include <mbgl/storage/resource.hpp>
 #include <mbgl/storage/offline.hpp>
 #include <mbgl/util/exception.hpp>
-#include <mbgl/util/noncopyable.hpp>
 #include <mbgl/util/optional.hpp>
 #include <mbgl/util/constants.hpp>
 #include <mbgl/util/mapbox.hpp>
@@ -36,7 +35,7 @@ struct MapboxTileLimitExceededException :  util::Exception {
     MapboxTileLimitExceededException() : util::Exception("Mapbox tile limit exceeded") {}
 };
 
-class OfflineDatabase : private util::noncopyable {
+class OfflineDatabase {
 public:
     OfflineDatabase(std::string path);
     ~OfflineDatabase();
@@ -97,6 +96,8 @@ public:
     void reopenDatabaseReadOnly(bool readOnly);
 
 private:
+    class DatabaseSizeChangeStats;
+
     void initialize();
     void handleError(const mapbox::sqlite::Exception&, const char* action);
     void handleError(const util::IOException&, const char* action);
@@ -150,7 +151,37 @@ private:
 
     optional<uint64_t> offlineMapboxTileCount;
 
-    bool evict(uint64_t neededFreeSize);
+    bool evict(uint64_t neededFreeSize, DatabaseSizeChangeStats& stats);
+
+    class DatabaseSizeChangeStats {
+    public:
+        explicit DatabaseSizeChangeStats(OfflineDatabase*);
+
+        // Returns difference between current database size and
+        // database size at the time of creation of this object.
+        int64_t diff() const;
+
+        // Returns how many bytes were released comparing to a database
+        // size at the time of creation of this object.
+        uint64_t bytesReleased() const;
+
+        // Returns page size for the database.
+        uint64_t pageSize() const;
+
+    private:
+        uint64_t pageSize_ = 0u;
+        uint64_t pageCount_ = 0u;
+        uint64_t initialSize_ = 0u;
+        OfflineDatabase* db = nullptr;
+    };
+
+    friend class DatabaseSizeChangeStats;
+
+    // Lazily initializes currentAmbientCacheSize.
+    std::exception_ptr initAmbientCacheSize();
+    optional<uint64_t> currentAmbientCacheSize;
+    void updateAmbientCacheSize(DatabaseSizeChangeStats&);
+
     bool autopack = true;
     bool readOnly = false;
 };