attachable.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_ATTACHABLE_HPP_
#define FOEDUS_ATTACHABLE_HPP_

#include "foedus/cxx11.hpp"
#include "foedus/fwd.hpp"
namespace foedus {
template <typename CONTROL_BLOCK>
class Attachable {
 public:
  Attachable() : engine_(CXX11_NULLPTR), control_block_(CXX11_NULLPTR) {}
  explicit Attachable(Engine* engine) : engine_(engine), control_block_(CXX11_NULLPTR) {}
  Attachable(Engine* engine, CONTROL_BLOCK* control_block)
    : engine_(engine), control_block_(CXX11_NULLPTR) {
    attach(control_block);
  }
  explicit Attachable(CONTROL_BLOCK* control_block)
    : engine_(CXX11_NULLPTR), control_block_(CXX11_NULLPTR) {
    attach(control_block);
  }
  virtual ~Attachable() {}

  // copy constructors
  Attachable(const Attachable& other)
    : engine_(other.engine_), control_block_(other.control_block_) {}
  Attachable& operator=(const Attachable& other) {
    engine_ = other.engine_;
    control_block_ = other.control_block_;
    return *this;
  }

  virtual void attach(CONTROL_BLOCK* control_block) {
    control_block_ = control_block;
  }

  bool            is_attached() const       { return control_block_; }
  CONTROL_BLOCK*  get_control_block() const { return control_block_; }

  Engine* get_engine() const          { return engine_; }
  void    set_engine(Engine* engine)  { engine_ = engine; }

 protected:
  Engine*         engine_;
  CONTROL_BLOCK*  control_block_;
};


}  // namespace foedus
#endif  // FOEDUS_ATTACHABLE_HPP_