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#ifndef INCLUDED_p2p_data_logger_hpp
#define INCLUDED_p2p_data_logger_hpp
#include <string>
#include <map>
#include <fstream>
#include <memory>
#include <thread>
#include <mutex>
#include <atomic>
namespace epee
{
namespace net_utils
{
enum class data_logger_state { state_before_init, state_during_init, state_ready_to_use, state_dying };
/***
@note: use it ONLY via singleton! It will be spawned then, and will auto destruct on program exit.
@note: do call ::kill_instance() before exiting main, at end of main. But before make sure no one else (e.g. no other threads) will try to use this/singleton
@note: it is not allowed to use this class from code "runnig before or after main", e.g. from ctors of static objects, because of static-creation-order races
@note: on creation (e.g. from singleton), it spawns a thread that saves all data in background
*/
class data_logger {
public:
static data_logger &get_instance(); ///< singleton
static void kill_instance(); ///< call this before ending main to allow more gracefull shutdown of the main singleton and it's background thread
~data_logger(); ///< destr, will be called when singleton is killed when global m_obj dies. will kill theads etc
private:
data_logger(); ///< constructor is private, use only via singleton get_instance
public:
data_logger(const data_logger &ob) = delete; // use only one per program
data_logger(data_logger &&ob) = delete;
data_logger & operator=(const data_logger&) = delete;
data_logger & operator=(data_logger&&) = delete;
void add_data(std::string filename, unsigned int data); ///< use this to append data here. Use it only the singleton. It locks itself.
static std::atomic<bool> m_save_graph; ///< global setting flag, should we save all the data or not (can disable logging graphs data)
private:
static std::once_flag m_singleton; ///< to guarantee singleton creates the object exactly once
static data_logger_state m_state; ///< state of the singleton object
static std::atomic<bool> m_thread_maybe_running; ///< is the background thread (more or less) running, or is it fully finished
static std::unique_ptr<data_logger> m_obj; ///< the singleton object. Only use it via get_instance(). Can be killed by kill_instance()
/***
* one graph/file with data
*/
class fileData {
public:
fileData() = default;
fileData(const fileData &ob) = delete;
fileData(std::string pFile);
std::shared_ptr<std::ofstream> mFile;
long int mDataToSave = 0; ///< sum of the data (in current interval, will be counted from 0 on next interval)
static double get_current_time();
void save();
std::string mPath;
bool mLimitFile = false; ///< this holds a number (that is not additive) - e.g. the limit setting
};
std::map<std::string, fileData> mFilesMap;
std::mutex mMutex;
void saveToFile(); ///< write data to the target files. do not use this directly
};
} // namespace
} // namespace
#endif
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