wifi-tx-timer.h

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/*
 * Copyright (c) 2020 Universita' degli Studi di Napoli Federico II
 *
 * 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
 *
 * Author: Stefano Avallone <stavallo@unina.it>
 */
 
#ifndef WIFI_TX_TIMER_H
#define WIFI_TX_TIMER_H
 
#include "ns3/event-id.h"
#include "ns3/nstime.h"
#include "ns3/simulator.h"
#include "ns3/traced-callback.h"
 
#include <functional>
#include <unordered_map>
 
namespace ns3
{
 
class WifiMpdu;
class WifiPsdu;
class WifiTxVector;
class Mac48Address;
 
typedef std::unordered_map<uint16_t /* staId */, Ptr<WifiPsdu> /* PSDU */> WifiPsduMap;
 
class WifiTxTimer
{
  public:
    enum Reason : uint8_t
    {
        NOT_RUNNING = 0,
        WAIT_CTS,
        WAIT_NORMAL_ACK,
        WAIT_BLOCK_ACK,
        WAIT_CTS_AFTER_MU_RTS,
        WAIT_NORMAL_ACK_AFTER_DL_MU_PPDU,
        WAIT_BLOCK_ACKS_IN_TB_PPDU,
        WAIT_TB_PPDU_AFTER_BASIC_TF,
        WAIT_QOS_NULL_AFTER_BSRP_TF,
        WAIT_BLOCK_ACK_AFTER_TB_PPDU,
    };
 
    WifiTxTimer();
 
    virtual ~WifiTxTimer();
 
    template <typename MEM, typename OBJ, typename... Args>
    void Set(Reason reason,
             const Time& delay,
             const std::set<Mac48Address>& from,
             MEM mem_ptr,
             OBJ obj,
             Args... args);
 
    void Reschedule(const Time& delay);
 
    Reason GetReason() const;
 
    std::string GetReasonString(Reason reason) const;
 
    bool IsRunning() const;
 
    void Cancel();
 
    void GotResponseFrom(const Mac48Address& from);
 
    const std::set<Mac48Address>& GetStasExpectedToRespond() const;
 
    Time GetDelayLeft() const;
 
    typedef Callback<void, uint8_t, Ptr<const WifiMpdu>, const WifiTxVector&> MpduResponseTimeout;
 
    typedef Callback<void, uint8_t, Ptr<const WifiPsdu>, const WifiTxVector&> PsduResponseTimeout;
 
    typedef Callback<void, uint8_t, WifiPsduMap*, const std::set<Mac48Address>*, std::size_t>
        PsduMapResponseTimeout;
 
    void SetMpduResponseTimeoutCallback(MpduResponseTimeout callback) const;
 
    void SetPsduResponseTimeoutCallback(PsduResponseTimeout callback) const;
 
    void SetPsduMapResponseTimeoutCallback(PsduMapResponseTimeout callback) const;
 
  private:
    template <typename MEM, typename OBJ, typename... Args>
    void Timeout(MEM mem_ptr, OBJ obj, Args... args);
 
    void Expire();
 
    void FeedTraceSource(Ptr<WifiMpdu> item, WifiTxVector txVector);
 
    void FeedTraceSource(Ptr<WifiPsdu> psdu, WifiTxVector txVector);
 
    void FeedTraceSource(WifiPsduMap* psduMap, std::size_t nTotalStations);
 
    EventId m_timeoutEvent; 
    Reason m_reason;        
    Ptr<EventImpl> m_impl;  
    Time m_end;             
    std::set<Mac48Address>
        m_staExpectResponseFrom; 
 
    mutable MpduResponseTimeout m_mpduResponseTimeoutCallback;
    mutable PsduResponseTimeout m_psduResponseTimeoutCallback;
    mutable PsduMapResponseTimeout m_psduMapResponseTimeoutCallback;
};
 
} // namespace ns3
 
/***************************************************************
 *  Implementation of the templates declared above.
 ***************************************************************/
 
namespace ns3
{
 
template <typename MEM, typename OBJ, typename... Args>
void
WifiTxTimer::Set(Reason reason,
                 const Time& delay,
                 const std::set<Mac48Address>& from,
                 MEM mem_ptr,
                 OBJ obj,
                 Args... args)
{
    typedef void (WifiTxTimer::*TimeoutType)(MEM, OBJ, Args...);
 
    m_timeoutEvent = Simulator::Schedule(delay, &WifiTxTimer::Expire, this);
    m_reason = reason;
    m_end = Simulator::Now() + delay;
    m_staExpectResponseFrom = from;
 
    // create an event to invoke when the timer expires
    m_impl = Ptr<EventImpl>(MakeEvent<TimeoutType>(&WifiTxTimer::Timeout,
                                                   this,
                                                   mem_ptr,
                                                   obj,
                                                   std::forward<Args>(args)...),
                            false);
}
 
template <typename MEM, typename OBJ, typename... Args>
void
WifiTxTimer::Timeout(MEM mem_ptr, OBJ obj, Args... args)
{
    FeedTraceSource(std::forward<Args>(args)...);
 
    // Invoke the method set by the user
    ((*obj).*mem_ptr)(std::forward<Args>(args)...);
}
 
} // namespace ns3
 
#endif /* WIFI_TX_TIMER_H */