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/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2011 University of California, Los Angeles
*
* 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: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
*/
#include "ndn-consumer-window.h"
#include "ns3/ptr.h"
#include "ns3/log.h"
#include "ns3/simulator.h"
#include "ns3/packet.h"
#include "ns3/callback.h"
#include "ns3/string.h"
#include "ns3/uinteger.h"
#include "ns3/double.h"
NS_LOG_COMPONENT_DEFINE ("ndn.ConsumerWindow");
namespace ns3 {
namespace ndn {
NS_OBJECT_ENSURE_REGISTERED (ConsumerWindow);
TypeId
ConsumerWindow::GetTypeId (void)
{
static TypeId tid = TypeId ("ns3::ndn::ConsumerWindow")
.SetGroupName ("Ndn")
.SetParent<Consumer> ()
.AddConstructor<ConsumerWindow> ()
.AddAttribute ("Window", "Initial size of the window",
StringValue ("1"),
MakeUintegerAccessor (&ConsumerWindow::GetWindow, &ConsumerWindow::SetWindow),
MakeUintegerChecker<uint32_t> ())
.AddAttribute ("PayloadSize", "Average size of content object size (to calculate interest generation rate)",
UintegerValue (1040),
MakeUintegerAccessor (&ConsumerWindow::GetPayloadSize, &ConsumerWindow::SetPayloadSize),
MakeUintegerChecker<uint32_t>())
.AddAttribute ("Size", "Amount of data in megabytes to request, relying on PayloadSize parameter (alternative to MaxSeq attribute)",
DoubleValue (-1), // don't impose limit by default
MakeDoubleAccessor (&ConsumerWindow::GetMaxSize, &ConsumerWindow::SetMaxSize),
MakeDoubleChecker<double> ())
.AddAttribute ("MaxSeq",
"Maximum sequence number to request (alternative to Size attribute)",
IntegerValue (std::numeric_limits<uint32_t>::max ()),
MakeIntegerAccessor (&ConsumerWindow::m_seqMax),
MakeIntegerChecker<uint32_t> ())
.AddAttribute ("InitialWindowOnTimeout", "Set window to initial value when timeout occurs",
BooleanValue (true),
MakeBooleanAccessor (&ConsumerWindow::m_setInitialWindowOnTimeout),
MakeBooleanChecker ())
.AddTraceSource ("WindowTrace",
"Window that controls how many outstanding interests are allowed",
MakeTraceSourceAccessor (&ConsumerWindow::m_window))
.AddTraceSource ("InFlight",
"Current number of outstanding interests",
MakeTraceSourceAccessor (&ConsumerWindow::m_inFlight))
;
return tid;
}
ConsumerWindow::ConsumerWindow ()
: m_payloadSize (1040)
, m_inFlight (0)
{
}
void
ConsumerWindow::SetWindow (uint32_t window)
{
m_initialWindow = window;
m_window = m_initialWindow;
}
uint32_t
ConsumerWindow::GetWindow () const
{
return m_initialWindow;
}
uint32_t
ConsumerWindow::GetPayloadSize () const
{
return m_payloadSize;
}
void
ConsumerWindow::SetPayloadSize (uint32_t payload)
{
m_payloadSize = payload;
}
double
ConsumerWindow::GetMaxSize () const
{
if (m_seqMax == 0)
return -1.0;
return m_maxSize;
}
void
ConsumerWindow::SetMaxSize (double size)
{
m_maxSize = size;
if (m_maxSize < 0)
{
m_seqMax = 0;
return;
}
m_seqMax = floor(1.0 + m_maxSize * 1024.0 * 1024.0 / m_payloadSize);
NS_LOG_DEBUG ("MaxSeqNo: " << m_seqMax);
// std::cout << "MaxSeqNo: " << m_seqMax << "\n";
}
void
ConsumerWindow::ScheduleNextPacket ()
{
if (m_window == static_cast<uint32_t> (0))
{
Simulator::Remove (m_sendEvent);
NS_LOG_DEBUG ("Next event in " << (std::min<double> (0.5, m_rtt->RetransmitTimeout ().ToDouble (Time::S))) << " sec");
m_sendEvent = Simulator::Schedule (Seconds (std::min<double> (0.5, m_rtt->RetransmitTimeout ().ToDouble (Time::S))),
&Consumer::SendPacket, this);
}
else if (m_inFlight >= m_window)
{
// simply do nothing
}
else
{
if (m_sendEvent.IsRunning ())
{
Simulator::Remove (m_sendEvent);
}
m_sendEvent = Simulator::ScheduleNow (&Consumer::SendPacket, this);
}
}
///////////////////////////////////////////////////
// Process incoming packets //
///////////////////////////////////////////////////
void
ConsumerWindow::OnContentObject (const Ptr<const ContentObject> &contentObject,
Ptr<Packet> payload)
{
Consumer::OnContentObject (contentObject, payload);
m_window = m_window + 1;
if (m_inFlight > static_cast<uint32_t> (0)) m_inFlight--;
NS_LOG_DEBUG ("Window: " << m_window << ", InFlight: " << m_inFlight);
ScheduleNextPacket ();
}
void
ConsumerWindow::OnNack (const Ptr<const Interest> &interest, Ptr<Packet> payload)
{
Consumer::OnNack (interest, payload);
if (m_inFlight > static_cast<uint32_t> (0)) m_inFlight--;
if (m_window > static_cast<uint32_t> (0))
{
// m_window = 0.5 * m_window;//m_window - 1;
m_window = std::max<uint32_t> (0, m_window - 1);
}
NS_LOG_DEBUG ("Window: " << m_window << ", InFlight: " << m_inFlight);
ScheduleNextPacket ();
}
void
ConsumerWindow::OnTimeout (uint32_t sequenceNumber)
{
if (m_inFlight > static_cast<uint32_t> (0)) m_inFlight--;
if (m_setInitialWindowOnTimeout)
{
// m_window = std::max<uint32_t> (0, m_window - 1);
m_window = m_initialWindow;
}
NS_LOG_DEBUG ("Window: " << m_window << ", InFlight: " << m_inFlight);
Consumer::OnTimeout (sequenceNumber);
}
void
ConsumerWindow::WillSendOutInterest (uint32_t sequenceNumber)
{
m_inFlight ++;
Consumer::WillSendOutInterest (sequenceNumber);
}
} // namespace ndn
} // namespace ns3