wifi-mac-queue.h

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2005, 2009 INRIA
 * Copyright (c) 2009 MIRKO BANCHI
 *
 * 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
 *
 * Authors: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
 *          Mirko Banchi <mk.banchi@gmail.com>
 *          Stefano Avallone <stavallo@unina.it>
 */

#ifndef WIFI_MAC_QUEUE_H
#define WIFI_MAC_QUEUE_H

#include "ns3/queue.h"
#include "wifi-mac-header.h"

namespace ns3 {
class QosBlockedDestinations;

class WifiMacQueueItem : public SimpleRefCount<WifiMacQueueItem>
{
public:
  WifiMacQueueItem (Ptr<const Packet> p, const WifiMacHeader & header);

  virtual ~WifiMacQueueItem ();

  Ptr<const Packet> GetPacket (void) const;

  const WifiMacHeader & GetHeader (void) const;

  Mac48Address GetAddress (enum WifiMacHeader::AddressType type) const;

  Time GetTimeStamp (void) const;

  uint32_t GetSize (void) const;

private:
  WifiMacQueueItem ();
  WifiMacQueueItem (const WifiMacQueueItem &);
  WifiMacQueueItem &operator = (const WifiMacQueueItem &);

  Ptr<const Packet> m_packet;  
  WifiMacHeader m_header;      
  Time m_tstamp;               
};


// The following explicit template instantiation declaration prevents modules
// including this header file from implicitly instantiating Queue<WifiMacQueueItem>.
// This would cause python examples using wifi to crash at runtime with the
// following error message: "Trying to allocate twice the same uid:
// ns3::Queue<WifiMacQueueItem>"
extern template class Queue<WifiMacQueueItem>;


class WifiMacQueue : public Queue<WifiMacQueueItem>
{
public:
  static TypeId GetTypeId (void);
  WifiMacQueue ();
  ~WifiMacQueue ();

  enum DropPolicy
  {
    DROP_NEWEST,
    DROP_OLDEST
  };

  void SetMaxDelay (Time delay);
  Time GetMaxDelay (void) const;

  bool Enqueue (Ptr<WifiMacQueueItem> item);
  bool PushFront (Ptr<WifiMacQueueItem> item);
  Ptr<WifiMacQueueItem> Dequeue (void);
  Ptr<WifiMacQueueItem> DequeueByTidAndAddress (uint8_t tid,
                                                WifiMacHeader::AddressType type,
                                                Mac48Address addr);
  Ptr<WifiMacQueueItem> DequeueFirstAvailable (const Ptr<QosBlockedDestinations> blockedPackets);
  Ptr<const WifiMacQueueItem> Peek (void) const;
  Ptr<const WifiMacQueueItem> PeekByTidAndAddress (uint8_t tid,
                                                   WifiMacHeader::AddressType type,
                                                   Mac48Address addr);
  Ptr<const WifiMacQueueItem> PeekFirstAvailable (const Ptr<QosBlockedDestinations> blockedPackets);
  Ptr<WifiMacQueueItem> Remove (void);
  bool Remove (Ptr<const Packet> packet);
  uint32_t GetNPacketsByTidAndAddress (uint8_t tid,
                                       WifiMacHeader::AddressType type,
                                       Mac48Address addr);

  bool IsEmpty (void);

  uint32_t GetNPackets (void);

  uint32_t GetNBytes (void);

private:
  bool TtlExceeded (ConstIterator &it);

  Time m_maxDelay;                          
  DropPolicy m_dropPolicy;                  

  NS_LOG_TEMPLATE_DECLARE;                  
};

} //namespace ns3

#endif /* WIFI_MAC_QUEUE_H */