cache_manager_pimpl.hpp

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/*
 * Copyright (c) 2014-2015, Hewlett-Packard Development Company, LP.
 * This program 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 2 of the License, or (at your option)
 * any later version.
 *
 * This program 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * HP designates this particular file as subject to the "Classpath" exception
 * as provided by HP in the LICENSE.txt file that accompanied this code.
 */
#ifndef FOEDUS_CACHE_CACHE_MANAGER_PIMPL_HPP_
#define FOEDUS_CACHE_CACHE_MANAGER_PIMPL_HPP_

#include <atomic>
#include <string>
#include <thread>

#include "foedus/fwd.hpp"
#include "foedus/initializable.hpp"
#include "foedus/cache/fwd.hpp"
#include "foedus/memory/aligned_memory.hpp"
#include "foedus/memory/page_pool.hpp"

namespace foedus {
namespace cache {
class CacheManagerPimpl final : public DefaultInitializable {
 public:
  CacheManagerPimpl() = delete;
  explicit CacheManagerPimpl(Engine* engine);
  ErrorStack  initialize_once() override;
  ErrorStack  uninitialize_once() override;

  std::string describe() const;

  void        handle_cleaner();
  void        handle_cleaner_evict_pages(uint64_t target_count);

  ErrorStack  stop_cleaner();

  Engine* const     engine_;

  std::thread       cleaner_;
  uint64_t          total_pages_;
  uint64_t          cleaner_threshold_;
  uint64_t          urgent_threshold_;
  std::atomic<bool> stop_requested_;

  memory::PagePool* pool_;

  CacheHashtable*   hashtable_;

  memory::PagePoolOffset* reclaimed_pages_;

  memory::AlignedMemory reclaimed_pages_memory_;

  uint64_t  reclaimed_pages_count_;
};
}  // namespace cache
}  // namespace foedus
#endif  // FOEDUS_CACHE_CACHE_MANAGER_PIMPL_HPP_