ReferenceManager.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; either 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_Master_ReferenceManager_h
#define Hypertable_Master_ReferenceManager_h

#include <Hypertable/Master/Operation.h>

#include <mutex>
#include <unordered_map>

namespace Hypertable {


  class ReferenceManager {
  public:

    bool add(OperationPtr operation) {
      std::lock_guard<std::mutex> lock(m_mutex);
      if (m_map.find(operation->id()) != m_map.end())
        return false;
      m_map[operation->id()] = operation;
      return true;
    }

    OperationPtr get(int64_t id) {
      std::lock_guard<std::mutex> lock(m_mutex);
      auto iter = m_map.find(id);
      if (iter == m_map.end())
        return 0;
      return (*iter).second;
    }

    void remove(OperationPtr operation) {
      std::lock_guard<std::mutex> lock(m_mutex);
      auto iter = m_map.find(operation->id());
      if (iter != m_map.end())
        m_map.erase(iter);
    }

    void clear() {
      std::lock_guard<std::mutex> lock(m_mutex);
      m_map.clear();
    }

  private:

    std::mutex m_mutex;

    std::unordered_map<int64_t, OperationPtr> m_map;
  };


} // namespace Hypertable

#endif // Hypertable_Master_ReferenceManager_h