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include/drives/directory_cache.hpp

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+/*
+  Copyright <2018-2022> <scott.e.graves@protonmail.com>
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+  associated documentation files (the "Software"), to deal in the Software without restriction,
+  including without limitation the rights to use, copy, modify, merge, publish, distribute,
+  sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all copies or
+  substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
+  NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+  DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
+  OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+#ifndef INCLUDE_DRIVES_DIRECTORY_CACHE_HPP_
+#define INCLUDE_DRIVES_DIRECTORY_CACHE_HPP_
+
+#include "common.hpp"
+
+namespace repertory {
+class directory_iterator;
+
+class directory_cache final {
+public:
+  typedef std::function<void(directory_iterator &iterator)> execute_callback;
+
+private:
+  struct open_directory {
+    directory_iterator *iterator;
+    std::chrono::system_clock::time_point last_update = std::chrono::system_clock::now();
+  };
+
+public:
+  directory_cache() = default;
+
+  ~directory_cache() { stop(); }
+
+private:
+  std::unordered_map<std::string, open_directory> directory_lookup_;
+  std::recursive_mutex directory_mutex_;
+  bool is_shutdown_ = true;
+  std::unique_ptr<std::thread> refresh_thread_;
+  std::mutex shutdown_mutex_;
+  std::condition_variable shutdown_notify_;
+
+private:
+  void refresh_thread();
+
+public:
+  bool execute_action(const std::string &api_path, const execute_callback &execute);
+
+  directory_iterator *remove_directory(const std::string &api_path);
+
+  void remove_directory(directory_iterator *iterator);
+
+  void set_directory(const std::string &api_path, directory_iterator *iterator);
+
+  void start();
+
+  void stop();
+};
+} // namespace repertory
+
+#endif // INCLUDE_DRIVES_DIRECTORY_CACHE_HPP_