////////////////////////////////////////////////////////////////////////////////
/// @brief Write-ahead log slot
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2004-2013 triAGENS GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is triAGENS GmbH, Cologne, Germany
///
/// @author Jan Steemann
/// @author Copyright 2011-2013, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

#include "Wal/Slot.h"

using namespace triagens::wal;

// -----------------------------------------------------------------------------
// --SECTION--                                      constructors and destructors
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief create a slot
////////////////////////////////////////////////////////////////////////////////

Slot::Slot ()
  : _tick(0),
    _logfileId(0),
    _mem(nullptr),
    _size(0),
    _status(StatusType::UNUSED) {

}

////////////////////////////////////////////////////////////////////////////////
/// @brief destroy a slot
////////////////////////////////////////////////////////////////////////////////

Slot::~Slot () {
}

// -----------------------------------------------------------------------------
// --SECTION--                                                    public methods
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief return the slot status as a string
////////////////////////////////////////////////////////////////////////////////

std::string Slot::statusText () const {
  switch (_status) {
    case StatusType::UNUSED:
      return "unused";
    case StatusType::USED:
      return "used";
    case StatusType::RETURNED:
      return "returned";
  }
}

// -----------------------------------------------------------------------------
// --SECTION--                                                   private methods
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief mark as slot as used
////////////////////////////////////////////////////////////////////////////////

void Slot::setUnused () {
  assert(isReturned());
  _tick      = 0;
  _logfileId = 0;
  _mem       = nullptr;
  _size      = 0;
  _status    = StatusType::UNUSED;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief mark as slot as used
////////////////////////////////////////////////////////////////////////////////

void Slot::setUsed (void* mem,
                    uint32_t size,
                    Logfile::IdType logfileId,
                    Slot::TickType tick) {
  assert(isUnused());
  _tick = tick;
  _logfileId = logfileId;
  _mem = mem;
  _size = size;
  _status = StatusType::USED;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief mark as slot as returned
////////////////////////////////////////////////////////////////////////////////

void Slot::setReturned () {
  assert(isUsed());
  _status = StatusType::RETURNED;
}

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