TimerHandler.h

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/*
 * Copyright (C) 2007-2015 Hypertable, Inc.
 *
 * This file is part of Hypertable.
 *
 * Hypertable 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; version 3 of the
 * License, or any later version.
 *
 * Hypertable 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., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */


#ifndef Hypertable_RangeServer_TimerHandler_h
#define Hypertable_RangeServer_TimerHandler_h

#include <AsyncComm/ApplicationQueue.h>
#include <AsyncComm/DispatchHandler.h>

#include <Common/Time.h>

#include <boost/shared_ptr.hpp>
#include <boost/thread/condition.hpp>

#include <chrono>
#include <memory>
#include <mutex>

namespace Hypertable {

  namespace Apps {
    class RangeServer;
  }


  class TimerHandler : public DispatchHandler {

  public:
    TimerHandler(Comm *comm, Apps::RangeServer *range_server);

    void start();

    void handle(Hypertable::EventPtr &event);

    void schedule_immediate_maintenance();

    void maintenance_scheduled_notify();

    bool low_memory_mode() { return m_low_memory_mode; }

    void shutdown();

  private:

    std::mutex m_mutex;

    Comm *m_comm {};

    Apps::RangeServer *m_range_server {};

    ApplicationQueuePtr m_app_queue;

    int64_t m_query_cache_memory {};
    
    int64_t m_userlog_size_threshold {};

    int64_t m_restart_generation {};

    std::chrono::steady_clock::time_point m_last_schedule;

    std::chrono::steady_clock::time_point m_pause_time;

    int32_t m_timer_interval {};

    int32_t m_current_interval {};

    int32_t m_max_app_queue_pause {};

    bool m_shutdown {};

    bool m_immediate_maintenance_scheduled {};

    bool m_app_queue_paused {};

    bool m_low_memory_mode {};

    bool m_schedule_outstanding {};

    void pause_app_queue();

    void restart_app_queue();

    bool low_memory();
  };

  typedef std::shared_ptr<TimerHandler> TimerHandlerPtr;

}

#endif // Hypertable_RangeServer_TimerHandler_h