// ----------------------------------------------------------------------
// File: ExpirationEventIterator.hh
// Author: Georgios Bitzes - CERN
// ----------------------------------------------------------------------

/************************************************************************
 * quarkdb - a redis-like highly available key-value store              *
 * Copyright (C) 2018 CERN/Switzerland                                  *
 *                                                                      *
 * 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 3 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, see <http://www.gnu.org/licenses/>.*
 ************************************************************************/

#ifndef QUARKDB_EXPIRATION_EVENT_ITERATOR_H
#define QUARKDB_EXPIRATION_EVENT_ITERATOR_H

#include "StateMachine.hh"
#include <vector>
#include <string_view>

namespace quarkdb {

class StagingArea;
using ClockValue = uint64_t;

class ExpirationEventIterator {
public:
  ExpirationEventIterator(StagingArea &stagingArea);
  virtual ~ExpirationEventIterator();

  bool valid();
  void next();

  ClockValue getDeadline();
  std::string_view getRedisKey();

private:
  void assertDeadlineSanity();

  StagingArea &stagingArea;
  ClockValue lastDeadline = 0;
  StateMachine::IteratorPtr iter;

};

}

#endif