Initial structure

include/Core/Util/FileWatcher.h

@@ -0,0 +1,81 @@
+#include <boost/filesystem.hpp>
+#include <boost/thread.hpp>
+#include <functional>
+#include <unordered_map>
+
+#include "Core/Util/Logging.h"
+
+namespace std
+{
+	template<> struct hash < boost::filesystem::path >
+	{
+		size_t operator()(const boost::filesystem::path& p) const
+		{
+			return boost::filesystem::hash_value(p);
+		}
+	};
+}
+
+namespace dd
+{
+
+	class FileWatcher
+	{
+	public:
+		enum class FileEventFlags;
+		typedef std::function<void(std::string, FileEventFlags)> FileEventCallback_t;
+
+		FileWatcher();
+		FileWatcher(std::string rootPath);
+		~FileWatcher();
+
+		std::string RootPath() const { return m_RootPath.string(); }
+		void AddWatch(std::string path, FileEventCallback_t callback);
+		void Start();
+		bool IsRunning() const { return m_IsRunning; }
+		void Stop();
+		void Check();
+
+	private:
+		class Worker;
+
+		boost::filesystem::path m_RootPath;
+		boost::thread m_Thread;
+		Worker* m_Worker = nullptr;
+		bool m_IsRunning = false;
+	};
+
+	enum class FileWatcher::FileEventFlags
+	{
+		None = 0,
+		Created = 1 << 0,
+		SizeChanged = 1 << 1,
+		TimestampChanged = 1 << 2,
+		Deleted = 1 << 3,
+	};
+	inline FileWatcher::FileEventFlags operator|(FileWatcher::FileEventFlags a, FileWatcher::FileEventFlags b) { return static_cast<FileWatcher::FileEventFlags>(static_cast<int>(a) | static_cast<int>(b)); }
+	inline bool operator&(FileWatcher::FileEventFlags a, FileWatcher::FileEventFlags b) { return static_cast<int>(a)& static_cast<int>(b); }
+
+	class FileWatcher::Worker
+	{
+	public:
+		void operator()();
+		void AddWatch(std::string path, FileEventCallback_t callback);
+		void Check();
+
+	private:
+		struct FileInfo
+		{
+			int Size;
+			std::time_t Timestamp;
+		};
+
+		std::unordered_map<boost::filesystem::path, FileEventCallback_t> m_FileCallbacks;
+		std::unordered_map<boost::filesystem::path, FileInfo> m_FileInfo;
+		boost::mutex m_Mutex;
+
+		FileInfo GetFileInfo(boost::filesystem::path path);
+		FileEventFlags UpdateFileInfo(boost::filesystem::path path);
+	};
+
+}