log_reducer_ref.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_SNAPSHOT_LOG_REDUCER_REF_HPP_
#define FOEDUS_SNAPSHOT_LOG_REDUCER_REF_HPP_

#include <stdint.h>

#include <cstring>
#include <iosfwd>
#include <string>

#include "foedus/cxx11.hpp"
#include "foedus/fwd.hpp"
#include "foedus/snapshot/fwd.hpp"
#include "foedus/storage/fwd.hpp"
#include "foedus/storage/storage_id.hpp"

namespace foedus {
namespace snapshot {

class LogReducerRef {
 public:
  LogReducerRef() {
    engine_ = CXX11_NULLPTR;
    control_block_ = CXX11_NULLPTR;
    buffers_[0] = CXX11_NULLPTR;
    buffers_[1] = CXX11_NULLPTR;
    root_info_pages_ = CXX11_NULLPTR;
  }
  LogReducerRef(Engine* engine, uint16_t node);

  uint16_t    get_id() const;
  std::string to_string() const;
  void        clear();
  uint32_t    get_total_storage_count() const;
  storage::Page* get_root_info_pages() { return root_info_pages_; }
  friend std::ostream&    operator<<(std::ostream& o, const LogReducerRef& v);

  void append_log_chunk(
    storage::StorageId storage_id,
    const char* send_buffer,
    uint32_t log_count,
    uint64_t send_buffer_size,
    uint32_t shortest_key_length,
    uint32_t longest_key_length);

 protected:
  const Snapshot& get_cur_snapshot() const;
  uint64_t  get_buffer_size() const;
  uint32_t  get_current_buffer_index_atomic() const;
  void*     get_buffer(uint32_t index) const;
  bool      verify_log_chunk(
    storage::StorageId storage_id,
    const char* send_buffer,
    uint32_t log_count,
    uint64_t send_buffer_size) const;

  Engine*                 engine_;
  LogReducerControlBlock* control_block_;
  void*                   buffers_[2];
  storage::Page*          root_info_pages_;
};

}  // namespace snapshot
}  // namespace foedus
#endif  // FOEDUS_SNAPSHOT_LOG_REDUCER_REF_HPP_