AccessGroupGarbageTracker.h

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/* -*- c++ -*-
 * 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_AccessGroupGarbageTracker_h
#define Hypertable_RangeServer_AccessGroupGarbageTracker_h

#include <Hypertable/RangeServer/CellCacheManager.h>
#include <Hypertable/RangeServer/CellStoreInfo.h>
#include <Hypertable/RangeServer/MergeScannerAccessGroup.h>

#include <Hypertable/Lib/Schema.h>

#include <Common/Properties.h>

#include <ctime>
#include <fstream>
#include <mutex>
#include <vector>

namespace Hypertable {


  class AccessGroupGarbageTracker {
  public:

    AccessGroupGarbageTracker(PropertiesPtr &props,
                              CellCacheManagerPtr &cell_cache_manager,
                              AccessGroupSpec *ag_spec);

    void update_schema(AccessGroupSpec *ag_spec);
    
    bool check_needed(time_t now);

    bool collection_needed(double total, double garbage) {
      return (garbage / total) >= m_garbage_threshold;
    }

    void adjust_targets(time_t now, double total, double garbage);

    void adjust_targets(time_t now, MergeScannerAccessGroup *mscanner);

    void update_cellstore_info(std::vector<CellStoreInfo> &stores, time_t t=0,
                               bool collection_performed=true);

    void output_state(std::ofstream &out, const std::string &label);

  private:

    int64_t memory_accumulated_since_collection();

    int64_t total_accumulated_since_collection();

    int64_t compute_delete_count();

    bool check_needed_deletes();

    bool check_needed_ttl(time_t now);

    std::mutex m_mutex;
    
    CellCacheManagerPtr m_cell_cache_manager;

    double m_garbage_threshold;

    time_t m_elapsed_target {};

    time_t m_elapsed_target_minimum {};

    time_t m_last_collection_time {0};

    uint32_t m_stored_deletes {};

    int64_t m_stored_expirable {};

    int64_t m_last_collection_disk_usage {};

    int64_t m_current_disk_usage {};

    int64_t m_accum_data_target {};

    int64_t m_accum_data_target_minimum {};

    time_t m_min_ttl {};

    bool m_have_max_versions {};

    bool m_in_memory {};
  };


} // namespace Hypertable

#endif // Hypertable_RangeServer_AccessGroupGarbageTracker_h