Memory.h

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/*
 * Memory.h
 *
 *  Created on: 14 Feb 2020
 *      Author: Nicola Mori
 */

#ifndef MEMORY_H_
#define MEMORY_H_

#include "core/Exception.h"

#include <array>

namespace EA {

class Memory {
public:
  enum class Status : int { NORMAL = 0, WARNING = 1, CRITICAL = 2, EXHAUSTED = 3 };

  struct BadLevelsException : public Exception {
    using Exception::Exception;
  };

  static unsigned long long GetOccupation();

  static Status GetStatus();

  static void SetMaxMemory(unsigned long long maxMemory) { _maxMemory = maxMemory; }

  static unsigned long long GetMaxMemory() { return _maxMemory; }

  static void SetLevels(const std::array<float, 3> &levels);

  static const std::array<float, 3> &GetLevels() { return _levels; }

  using UnitType = unsigned long int;
  static constexpr UnitType KB = 1024UL, MB = 1024UL * 1024UL, GB = 1024UL * 1024UL * 1024UL;

private:
  static std::array<float, 3> _levels;
  static const int _pageSize;
  static unsigned long long _maxMemory;
};

const std::array<const std::string, 4> memLevelNames{"NORMAL", "WARNING", "CRITICAL", "EXHAUSTED"};
inline std::ostream &operator<<(std::ostream &out, const Memory::Status status) {
  return out << memLevelNames[static_cast<int>(status)];
}

} // namespace EA
#endif /* MEMORY_H_ */