[core] Remove file source from public Map ctor

1 files changed, 37 insertions, 0 deletions

diff --git a/src/mbgl/storage/file_source.cpp b/src/mbgl/storage/file_source.cpp
new file mode 100644
index 0000000000..5854682771
--- /dev/null
+++ b/src/mbgl/storage/file_source.cpp
@@ -0,0 +1,37 @@
+#include <mbgl/storage/file_source.hpp>
+#include <mbgl/storage/resource_options.hpp>
+#include <mbgl/util/string.hpp>
+
+#include <mutex>
+#include <map>
+
+namespace mbgl {
+
+std::shared_ptr<FileSource> FileSource::getSharedFileSource(const ResourceOptions& options) {
+    static std::mutex mutex;
+    static std::map<std::string, std::weak_ptr<mbgl::FileSource>> fileSources;
+
+    std::lock_guard<std::mutex> lock(mutex);
+
+    // Purge entries no longer in use.
+    for (auto it = fileSources.begin(); it != fileSources.end();) {
+        it = it->second.expired() ? fileSources.erase(it) : ++it;
+    }
+
+    const uint64_t context = reinterpret_cast<uint64_t>(options.platformContext());
+    const std::string key = options.baseURL() + '|' + options.accessToken() + '|' + options.cachePath() + '|' + util::toString(context);
+
+    std::shared_ptr<mbgl::FileSource> fileSource;
+    auto tuple = fileSources.find(key);
+    if (tuple != fileSources.end()) {
+        fileSource = tuple->second.lock();
+    }
+
+    if (!fileSource) {
+        fileSources[key] = fileSource = createPlatformFileSource(options);
+    }
+
+    return fileSource;
+}
+
+} // namespace mbgl