Refactoring AWS level 2 data provider, pushing up common functions

wxdata/include/scwx/provider/aws_nexrad_data_provider.hpp

@@ -0,0 +1,49 @@
+#pragma once
+
+#include <scwx/provider/nexrad_data_provider.hpp>
+
+namespace scwx
+{
+namespace provider
+{
+
+/**
+ * @brief AWS NEXRAD Data Provider
+ */
+class AwsNexradDataProvider : public NexradDataProvider
+{
+public:
+   explicit AwsNexradDataProvider(const std::string& radarSite,
+                                  const std::string& bucketName,
+                                  const std::string& region);
+   ~AwsNexradDataProvider();
+
+   AwsNexradDataProvider(const AwsNexradDataProvider&) = delete;
+   AwsNexradDataProvider& operator=(const AwsNexradDataProvider&) = delete;
+
+   AwsNexradDataProvider(AwsNexradDataProvider&&) noexcept;
+   AwsNexradDataProvider& operator=(AwsNexradDataProvider&&) noexcept;
+
+   size_t cache_size() const;
+
+   std::chrono::system_clock::time_point last_modified() const;
+   std::chrono::seconds                  update_period() const;
+
+   std::string FindKey(std::chrono::system_clock::time_point time);
+   std::string FindLatestKey();
+   std::pair<size_t, size_t>
+   ListObjects(std::chrono::system_clock::time_point date);
+   std::shared_ptr<wsr88d::NexradFile> LoadObjectByKey(const std::string& key);
+   size_t                              Refresh();
+
+protected:
+   virtual std::string
+   GetPrefix(std::chrono::system_clock::time_point date) = 0;
+
+private:
+   class Impl;
+   std::unique_ptr<Impl> p;
+};
+
+} // namespace provider
+} // namespace scwx