diff --git a/src/mbgl/tile/annotation_tile_source.cpp b/src/mbgl/tile/annotation_tile_source.cpp
index 143bcc23f..1d638d18f 100644
--- a/src/mbgl/tile/annotation_tile_source.cpp
+++ b/src/mbgl/tile/annotation_tile_source.cpp
@@ -18,7 +18,7 @@ AnnotationTileSource::~AnnotationTileSource() {
 }
 
 void AnnotationTileSource::update(std::unique_ptr<GeometryTile> tile) {
-    tileData.setData(nullptr, std::move(tile), {}, {});
+    tileData.setData(std::move(tile), {}, {});
 }
 
 } // namespace mbgl
diff --git a/src/mbgl/tile/annotation_tile_source.hpp b/src/mbgl/tile/annotation_tile_source.hpp
index 8d7a1d8a1..c06ee4a37 100644
--- a/src/mbgl/tile/annotation_tile_source.hpp
+++ b/src/mbgl/tile/annotation_tile_source.hpp
@@ -10,7 +10,7 @@ namespace mbgl {
 class AnnotationManager;
 class GeometryTile;
 
-class AnnotationTileSource : public GeometryTileSource {
+class AnnotationTileSource final : public GeometryTileSource {
 public:
     AnnotationTileSource(GeometryTileData&, const OverscaledTileID&, AnnotationManager&);
     ~AnnotationTileSource();
diff --git a/src/mbgl/tile/file_based_tile_source.hpp b/src/mbgl/tile/file_based_tile_source.hpp
new file mode 100644
index 000000000..e4099ed31
--- /dev/null
+++ b/src/mbgl/tile/file_based_tile_source.hpp
@@ -0,0 +1,22 @@
+#pragma once
+
+#include <mbgl/storage/resource.hpp>
+
+namespace mbgl {
+
+class FileSource;
+class AsyncRequest;
+
+template <typename T, typename I>
+class FileBasedTileSource : public T {
+protected:
+    FileBasedTileSource(typename T::data_type&, const Resource&, FileSource&);
+    virtual ~FileBasedTileSource() = default;
+
+protected:
+    const Resource resource;
+    FileSource& fileSource;
+    std::unique_ptr<AsyncRequest> request;
+};
+
+} // namespace mbgl
diff --git a/src/mbgl/tile/file_based_tile_source_impl.hpp b/src/mbgl/tile/file_based_tile_source_impl.hpp
new file mode 100644
index 000000000..1527f3b13
--- /dev/null
+++ b/src/mbgl/tile/file_based_tile_source_impl.hpp
@@ -0,0 +1,27 @@
+#pragma once
+
+#include <mbgl/tile/file_based_tile_source.hpp>
+#include <mbgl/storage/file_source.hpp>
+
+namespace mbgl {
+
+template <typename T, typename I>
+FileBasedTileSource<T, I>::FileBasedTileSource(typename T::data_type& tileData_,
+                                               const Resource& resource_,
+                                               FileSource& fileSource_)
+    : T(tileData_), resource(resource_), fileSource(fileSource_) {
+    request = fileSource.request(resource, [this](Response res) {
+        if (res.error) {
+            T::tileData.setError(std::make_exception_ptr(std::runtime_error(res.error->message)));
+        } else if (res.notModified) {
+            return;
+        } else if (res.noContent) {
+            T::tileData.setData(nullptr, res.modified, res.expires);
+        } else {
+
+            T::tileData.setData(I::parseData(res.data), res.modified, res.expires);
+        }
+    });
+}
+
+} // namespace mbgl
diff --git a/src/mbgl/tile/geojson_tile_source.cpp b/src/mbgl/tile/geojson_tile_source.cpp
index 3daf7cd02..fb526fd9f 100644
--- a/src/mbgl/tile/geojson_tile_source.cpp
+++ b/src/mbgl/tile/geojson_tile_source.cpp
@@ -92,7 +92,7 @@ void GeoJSONTileSource::update() {
     if (geojsonvt) {
         auto tile = convertTile(
             geojsonvt->getTile(tileID.canonical.z, tileID.canonical.x, tileID.canonical.y));
-        tileData.setData(nullptr, std::move(tile), {}, {});
+        tileData.setData(std::move(tile), {}, {});
     }
 }
 
diff --git a/src/mbgl/tile/geojson_tile_source.hpp b/src/mbgl/tile/geojson_tile_source.hpp
index bfa5f8725..faae757eb 100644
--- a/src/mbgl/tile/geojson_tile_source.hpp
+++ b/src/mbgl/tile/geojson_tile_source.hpp
@@ -14,7 +14,7 @@ class GeoJSONVT;
 
 namespace mbgl {
 
-class GeoJSONTileSource : public GeometryTileSource {
+class GeoJSONTileSource final : public GeometryTileSource {
 public:
     GeoJSONTileSource(GeometryTileData&, mapbox::geojsonvt::GeoJSONVT*, const OverscaledTileID&);
     virtual ~GeoJSONTileSource();
diff --git a/src/mbgl/tile/geometry_tile_data.cpp b/src/mbgl/tile/geometry_tile_data.cpp
index aefd327ff..1f1bca653 100644
--- a/src/mbgl/tile/geometry_tile_data.cpp
+++ b/src/mbgl/tile/geometry_tile_data.cpp
@@ -29,15 +29,13 @@ GeometryTileData::GeometryTileData(const OverscaledTileID& id_,
                  mode_) {
 }
 
-void GeometryTileData::setData(std::exception_ptr err,
-                               std::unique_ptr<GeometryTile> tile,
+void GeometryTileData::setError(std::exception_ptr err) {
+    observer->onTileError(*this, err);
+}
+
+void GeometryTileData::setData(std::unique_ptr<GeometryTile> tile,
                                optional<Timestamp> modified_,
                                optional<Timestamp> expires_) {
-    if (err) {
-        observer->onTileError(*this, err);
-        return;
-    }
-
     modified = modified_;
     expires = expires_;
 
diff --git a/src/mbgl/tile/geometry_tile_data.hpp b/src/mbgl/tile/geometry_tile_data.hpp
index d4eef956a..4e13278dc 100644
--- a/src/mbgl/tile/geometry_tile_data.hpp
+++ b/src/mbgl/tile/geometry_tile_data.hpp
@@ -29,8 +29,9 @@ public:
 
     ~GeometryTileData();
 
-    void setData(std::exception_ptr err,
-                 std::unique_ptr<GeometryTile> tile,
+    void setError(std::exception_ptr err);
+
+    void setData(std::unique_ptr<GeometryTile> tile,
                  optional<Timestamp> modified_,
                  optional<Timestamp> expires_);
 
diff --git a/src/mbgl/tile/image_tile_source.cpp b/src/mbgl/tile/image_tile_source.cpp
index e552c0e31..477c00dd1 100644
--- a/src/mbgl/tile/image_tile_source.cpp
+++ b/src/mbgl/tile/image_tile_source.cpp
@@ -1,25 +1,13 @@
 #include <mbgl/tile/image_tile_source.hpp>
+#include <mbgl/tile/file_based_tile_source_impl.hpp>
 #include <mbgl/tile/raster_tile_data.hpp>
-#include <mbgl/storage/file_source.hpp>
 
 namespace mbgl {
 
 ImageTileSource::ImageTileSource(RasterTileData& tileData_,
                                  const Resource& resource_,
                                  FileSource& fileSource_)
-    : RasterTileSource(tileData_), resource(resource_), fileSource(fileSource_) {
-    request = fileSource.request(resource, [this](Response res) {
-        if (res.error) {
-            tileData.setData(std::make_exception_ptr(std::runtime_error(res.error->message)),
-                             nullptr, res.modified, res.expires);
-        } else if (res.notModified) {
-            return;
-        } else if (res.noContent) {
-            tileData.setData(nullptr, nullptr, res.modified, res.expires);
-        } else {
-            tileData.setData(nullptr, res.data, res.modified, res.expires);
-        }
-    });
+    : FileBasedTileSource<RasterTileSource, ImageTileSource>(tileData_, resource_, fileSource_) {
 }
 
 } // namespace mbgl
diff --git a/src/mbgl/tile/image_tile_source.hpp b/src/mbgl/tile/image_tile_source.hpp
index 8b4e9c098..56b3f7ba8 100644
--- a/src/mbgl/tile/image_tile_source.hpp
+++ b/src/mbgl/tile/image_tile_source.hpp
@@ -1,23 +1,22 @@
 #pragma once
 
 #include <mbgl/tile/tile_source.hpp>
-#include <mbgl/tile/tile_id.hpp>
-#include <mbgl/storage/resource.hpp>
+#include <mbgl/tile/file_based_tile_source.hpp>
 
 namespace mbgl {
 
 class FileSource;
 class AsyncRequest;
 
-class ImageTileSource : public RasterTileSource {
+class ImageTileSource final : public FileBasedTileSource<RasterTileSource, ImageTileSource> {
 public:
     ImageTileSource(RasterTileData&, const Resource&, FileSource&);
     virtual ~ImageTileSource() = default;
 
-private:
-    const Resource resource;
-    FileSource& fileSource;
-    std::unique_ptr<AsyncRequest> request;
+    static std::shared_ptr<const std::string> parseData(std::shared_ptr<const std::string> data) {
+        return data;
+    }
+
 };
 
 } // namespace mbgl
diff --git a/src/mbgl/tile/raster_tile_data.cpp b/src/mbgl/tile/raster_tile_data.cpp
index 4702f60f4..dade0357c 100644
--- a/src/mbgl/tile/raster_tile_data.cpp
+++ b/src/mbgl/tile/raster_tile_data.cpp
@@ -17,15 +17,13 @@ RasterTileData::RasterTileData(const OverscaledTileID& id_,
       worker(worker_) {
 }
 
-void RasterTileData::setData(std::exception_ptr err,
-                               std::shared_ptr<const std::string> data,
-                               optional<Timestamp> modified_,
-                               optional<Timestamp> expires_) {
-    if (err) {
-        observer->onTileError(*this, err);
-        return;
-    }
+void RasterTileData::setError(std::exception_ptr err) {
+    observer->onTileError(*this, err);
+}
 
+void RasterTileData::setData(std::shared_ptr<const std::string> data,
+                             optional<Timestamp> modified_,
+                             optional<Timestamp> expires_) {
     modified = modified_;
     expires = expires_;
 
diff --git a/src/mbgl/tile/raster_tile_data.hpp b/src/mbgl/tile/raster_tile_data.hpp
index 17e1465eb..f5c82d4e0 100644
--- a/src/mbgl/tile/raster_tile_data.hpp
+++ b/src/mbgl/tile/raster_tile_data.hpp
@@ -21,8 +21,9 @@ public:
                    Worker&);
     ~RasterTileData();
 
-    void setData(std::exception_ptr err,
-                 std::shared_ptr<const std::string> data,
+    void setError(std::exception_ptr err);
+
+    void setData(std::shared_ptr<const std::string> data,
                  optional<Timestamp> modified_,
                  optional<Timestamp> expires_);
 
diff --git a/src/mbgl/tile/tile_source.hpp b/src/mbgl/tile/tile_source.hpp
index 294ddd0d6..ba4555129 100644
--- a/src/mbgl/tile/tile_source.hpp
+++ b/src/mbgl/tile/tile_source.hpp
@@ -13,25 +13,31 @@ class GeometryTileData;
 class RasterTileData;
 
 class GeometryTileSource : public TileSource {
+public:
+    using data_type = GeometryTileData;
+
 protected:
-    GeometryTileSource(GeometryTileData& tileData_) : tileData(tileData_) {}
+    GeometryTileSource(data_type& tileData_) : tileData(tileData_) {}
 
 public:
     virtual ~GeometryTileSource() = default;
 
 protected:
-    GeometryTileData& tileData;
+    data_type& tileData;
 };
 
 class RasterTileSource : public TileSource {
+public:
+    using data_type = RasterTileData;
+
 protected:
-    RasterTileSource(RasterTileData& tileData_) : tileData(tileData_) {};
+    RasterTileSource(data_type& tileData_) : tileData(tileData_) {};
 
 public:
     virtual ~RasterTileSource() = default;
 
 protected:
-    RasterTileData& tileData;
+    data_type& tileData;
 };
 
 } // namespace mbgl
diff --git a/src/mbgl/tile/vector_tile_source.cpp b/src/mbgl/tile/vector_tile_source.cpp
index 2ee0827b1..2439b5f01 100644
--- a/src/mbgl/tile/vector_tile_source.cpp
+++ b/src/mbgl/tile/vector_tile_source.cpp
@@ -1,27 +1,18 @@
 #include <mbgl/tile/vector_tile_source.hpp>
-#include <mbgl/tile/vector_tile.hpp>
+#include <mbgl/tile/file_based_tile_source_impl.hpp>
 #include <mbgl/tile/geometry_tile_data.hpp>
-#include <mbgl/storage/file_source.hpp>
+#include <mbgl/tile/vector_tile.hpp>
 
 namespace mbgl {
 
 VectorTileSource::VectorTileSource(GeometryTileData& tileData_,
                                    const Resource& resource_,
                                    FileSource& fileSource_)
-    : GeometryTileSource(tileData_), resource(resource_), fileSource(fileSource_) {
-    request = fileSource.request(resource, [this](Response res) {
-        if (res.error) {
-            tileData.setData(std::make_exception_ptr(std::runtime_error(res.error->message)),
-                             nullptr, res.modified, res.expires);
-        } else if (res.notModified) {
-            return;
-        } else if (res.noContent) {
-            tileData.setData(nullptr, nullptr, res.modified, res.expires);
-        } else {
-            tileData.setData(nullptr, std::make_unique<VectorTile>(res.data), res.modified,
-                             res.expires);
-        }
-    });
+    : FileBasedTileSource<GeometryTileSource, VectorTileSource>(tileData_, resource_, fileSource_) {
+}
+
+std::unique_ptr<GeometryTile> VectorTileSource::parseData(std::shared_ptr<const std::string> data) {
+    return data ? std::make_unique<VectorTile>(data) : nullptr;
 }
 
 } // namespace mbgl
diff --git a/src/mbgl/tile/vector_tile_source.hpp b/src/mbgl/tile/vector_tile_source.hpp
index fb64c7512..a73a80ae1 100644
--- a/src/mbgl/tile/vector_tile_source.hpp
+++ b/src/mbgl/tile/vector_tile_source.hpp
@@ -1,23 +1,20 @@
 #pragma once
 
 #include <mbgl/tile/tile_source.hpp>
-#include <mbgl/tile/tile_id.hpp>
-#include <mbgl/storage/resource.hpp>
+#include <mbgl/tile/file_based_tile_source.hpp>
+
+#include <memory>
 
 namespace mbgl {
 
-class FileSource;
-class AsyncRequest;
+class GeometryTile;
 
-class VectorTileSource : public GeometryTileSource {
+class VectorTileSource final : public FileBasedTileSource<GeometryTileSource, VectorTileSource> {
 public:
     VectorTileSource(GeometryTileData&, const Resource&, FileSource&);
     virtual ~VectorTileSource() = default;
 
-private:
-    const Resource resource;
-    FileSource& fileSource;
-    std::unique_ptr<AsyncRequest> request;
+    static std::unique_ptr<GeometryTile> parseData(std::shared_ptr<const std::string>);
 };
 
 } // namespace mbgl