MemoryTracker.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_MemoryTracker_h
#define Hypertable_RangeServer_MemoryTracker_h

#include <Hypertable/RangeServer/FileBlockCache.h>
#include <Hypertable/RangeServer/QueryCache.h>

#include <memory>
#include <mutex>

namespace Hypertable {


  class MemoryTracker {
  public:

    MemoryTracker(FileBlockCache *block_cache, QueryCachePtr query_cache) 
      : m_block_cache(block_cache), m_query_cache(query_cache) { }

    void add(int64_t amount) {
      std::lock_guard<std::mutex> lock(m_mutex);
      m_memory_used += amount;
    }

    void subtract(int64_t amount) {
      std::lock_guard<std::mutex> lock(m_mutex);
      m_memory_used -= amount;
    }

    int64_t balance() {
      std::lock_guard<std::mutex> lock(m_mutex);
      return m_memory_used + (m_block_cache ? m_block_cache->memory_used() : 0) +
        (m_query_cache ? m_query_cache->memory_used() : 0);
    }

  private:

    std::mutex m_mutex;

    int64_t m_memory_used {};

    FileBlockCache *m_block_cache;

    QueryCachePtr m_query_cache;
  };


}

#endif // Hypertable_RangeServer_MemoryTracker_h