/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2007 University of Washington

 * All rights reserved.

 *

 * 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

 */

#include "ns3/debug.h"

#include "queue.h"

NS_DEBUG_COMPONENT_DEFINE ("Queue");

namespace ns3 {

Queue::Queue() : 

  m_nBytes(0), 

  m_nTotalReceivedBytes(0),

  m_nPackets(0), 

  m_nTotalReceivedPackets(0),

  m_nTotalDroppedBytes(0),

  m_nTotalDroppedPackets(0)

{

  NS_DEBUG("Queue::Queue ()")

}

Queue::~Queue()

{

  NS_DEBUG("Queue::~Queue ()")

}

  bool 

Queue::Enque (const Packet& p)

{

  NS_DEBUG("Queue::Enque (" << &p << ")")

  NS_DEBUG("Queue::Enque (): m_traceEnque (p)")

  m_traceEnque ("+ <timestamp> ", p);

  bool retval = DoEnque (p);

  if (retval)

    {

      m_nBytes += p.GetSize ();

      m_nPackets++;

    }

  return retval;

}

  bool

Queue::Deque (Packet &p)

{

  NS_DEBUG("Queue::Deque (" << &p << ")")

  bool retval = DoDeque (p);

  if (retval)

    {

      m_nBytes -= p.GetSize ();

      m_nPackets--;

      NS_DEBUG("Queue::Deque (): m_traceDeque (p)")

      m_traceDeque ("+ <timestamp> ", static_cast<const Packet &>(p));

    }

  return retval;

}

  void

Queue::DequeAll (void)

{

  NS_DEBUG("Queue::DequeAll ()")

}

  uint32_t 

Queue::GetNPackets (void)

{

  NS_DEBUG("Queue::GetNPackets () <= " << m_nPackets)

  return m_nPackets;

}

  uint32_t

Queue::GetNBytes (void)

{

  NS_DEBUG("Queue::GetNBytes () <= " << m_nBytes)

  return m_nBytes;

}

  bool

Queue::IsEmpty (void)

{

  NS_DEBUG("Queue::IsEmpty () <= " << (m_nPackets == 0))

  return m_nPackets == 0;

}

  void

Queue::RegisterTraces (TraceContainer &container)

{

  NS_DEBUG("Queue::RegisterTraces (" << &container << ")")

  container.RegisterCallback ("Queue::Enque", &m_traceEnque);

  container.RegisterCallback ("Queue::Deque", &m_traceDeque);

  container.RegisterCallback ("Queue::Drop", &m_traceDrop);

}

  uint32_t

Queue::GetTotalReceivedBytes (void)

{

  NS_DEBUG(

    "Queue::GetTotalReceivedBytes () <= " << m_nTotalReceivedBytes)

  return m_nTotalReceivedBytes;

}

  uint32_t

Queue::GetTotalReceivedPackets (void)

{

  NS_DEBUG(

    "Queue::GetTotalReceivedPackets () <= " << m_nTotalReceivedPackets)

  return m_nTotalReceivedPackets;

}

  uint32_t

Queue:: GetTotalDroppedBytes (void)

{

  NS_DEBUG(

    "Queue::GetTotalDroppedBytes () <= " << m_nTotalDroppedBytes

)

  return m_nTotalDroppedBytes;

}

  uint32_t

Queue::GetTotalDroppedPackets (void)

{

  NS_DEBUG(

    "Queue::GetTotalDroppedPackets () <= " << m_nTotalDroppedPackets)

  return m_nTotalDroppedPackets;

}

  void 

Queue::ResetStatistics (void)

{

  NS_DEBUG("Queue::ResetStatistics ()")

  m_nTotalReceivedBytes = 0;

  m_nTotalReceivedPackets = 0;

  m_nTotalDroppedBytes = 0;

  m_nTotalDroppedPackets = 0;

}

  void

Queue::Drop (const Packet& p)

{

  NS_DEBUG("Queue::Drop (" << &p << ")")

  m_nTotalDroppedPackets++;

  m_nTotalDroppedBytes += p.GetSize ();

  NS_DEBUG("Queue::Drop (): m_traceDrop (p)")

  m_traceEnque ("d <timestamp> ", p);

}

}; // namespace ns3