ScannerMap.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_ScannerMap_h
#define Hypertable_RangeServer_ScannerMap_h

#include <Hypertable/RangeServer/MergeScannerRange.h>
#include <Hypertable/RangeServer/Range.h>

#include <Hypertable/Lib/ProfileDataScanner.h>

#include <atomic>
#include <mutex>
#include <unordered_map>

namespace Hypertable {


  class ScannerMap {

  public:

    int32_t put(MergeScannerRangePtr &scanner, RangePtr &range,
                 const TableIdentifier &table, ProfileDataScanner &profile_data);

    bool get(int32_t id, MergeScannerRangePtr &scanner, RangePtr &range,
             TableIdentifierManaged &table, ProfileDataScanner *profile_data);

    bool remove(int32_t id);

    void purge_expired(int32_t max_idle_ms);

    void get_counts(int32_t *totalp, CstrToInt32Map &table_scanner_count_map);

    void update_profile_data(int32_t id, ProfileDataScanner &profile_data);

  private:

    int64_t get_timestamp_millis();

    static std::atomic<int> ms_next_id;

    std::mutex m_mutex;

    struct ScanInfo {
      MergeScannerRangePtr scanner;
      RangePtr range;
      int64_t last_access_millis;
      TableIdentifierManaged table;
      ProfileDataScanner profile_data;
    };

    std::unordered_map<int32_t, ScanInfo> m_scanner_map;

  };


}


#endif // Hypertable_RangeServer_ScannerMap_h