last_state_logger.h

/*
 Copyright (C) AC SOFTWARE SP. Z O.O.
 
 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 as published by the Free Software Foundation; either version 2
 of the License, or (at your option) any later version.
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/
 
#ifndef SRC_SUPLA_DEVICE_LAST_STATE_LOGGER_H_
#define SRC_SUPLA_DEVICE_LAST_STATE_LOGGER_H_
 
#define LAST_STATE_LOGGER_BUFFER_SIZE 500
 
#include <stddef.h>
 
namespace Supla {
class Mutex;
 
namespace Device {
class LastStateLogger {
 public:
  LastStateLogger();
  virtual ~LastStateLogger();
  virtual void log(const char *, int uptimeSec);
  virtual void clear();
 
  // getLog locks the mutex on first call and releases it when all messages
  // have been read, so make sure you call it in a loop until null is returned
  virtual char *getLog();
  virtual bool prepareLastStateLog();
 
 protected:
  char buffer[LAST_STATE_LOGGER_BUFFER_SIZE] = {};
  size_t index = 0;
  Supla::Mutex *mutex = nullptr;
};
};  // namespace Device
};  // namespace Supla
 
#endif  // SRC_SUPLA_DEVICE_LAST_STATE_LOGGER_H_