impersonate_session.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_THREAD_IMPERSONATE_SESSION_HPP_
#define FOEDUS_THREAD_IMPERSONATE_SESSION_HPP_
#include <iosfwd>

#include "foedus/cxx11.hpp"
#include "foedus/error_stack.hpp"
#include "foedus/thread/fwd.hpp"

namespace foedus {
namespace thread {
struct ImpersonateSession CXX11_FINAL {
  ImpersonateSession() : thread_(CXX11_NULLPTR), ticket_(0) {}
  ~ImpersonateSession() { release(); }

  // Not copy-able
  ImpersonateSession(const ImpersonateSession& other) CXX11_FUNC_DELETE;
  ImpersonateSession& operator=(const ImpersonateSession& other) CXX11_FUNC_DELETE;

#ifndef DISABLE_CXX11_IN_PUBLIC_HEADERS
  // but move-able (only in C++11)
  ImpersonateSession(ImpersonateSession&& other);
  ImpersonateSession& operator=(ImpersonateSession&& other);
#endif  // DISABLE_CXX11_IN_PUBLIC_HEADERS

  bool        is_valid() const { return thread_ != CXX11_NULLPTR && ticket_ != 0; }
  bool        is_running() const;

  ErrorStack  get_result();
  uint64_t    get_output_size();
  void        get_output(void* output_buffer);
  const void* get_raw_output_buffer();

  void        wait() const;

  bool        wait_for(uint64_t timeout_microsec) const;

  void        release();

  friend std::ostream& operator<<(std::ostream& o, const ImpersonateSession& v);

  thread::ThreadRef*    thread_;

  thread::ThreadTicket  ticket_;
};
}  // namespace thread
}  // namespace foedus
#endif  // FOEDUS_THREAD_IMPERSONATE_SESSION_HPP_