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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2007 University of Washington
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * 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
 */

#ifndef DROPTAIL_H
#define DROPTAIL_H

#include <queue>
#include "ns3/queue.h"

namespace ns3 {

/**
 * \ingroup queue
 *
 * \brief A FIFO packet queue that drops tail-end packets on overflow
 */
class DropTailQueue : public Queue
{
public:
  /**
   * \brief Get the type ID.
   * \return the object TypeId
   */
  static TypeId GetTypeId (void);
  /**
   * \brief DropTailQueue Constructor
   *
   * Creates a droptail queue with a maximum size of 100 packets by default
   */
  DropTailQueue ();

  virtual ~DropTailQueue();

private:
  virtual bool DoEnqueue (Ptr<QueueItem> item);
  virtual Ptr<QueueItem> DoDequeue (void);
  virtual Ptr<QueueItem> DoRemove (void);
  virtual Ptr<const QueueItem> DoPeek (void) const;

  std::queue<Ptr<QueueItem> > m_packets; //!< the items in the queue
};

} // namespace ns3

#endif /* DROPTAIL_H */