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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.hpp"
#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, "
"would activate only if Size is -1). "
"The parameter is activated only if Size negative (not set)",
IntegerValue(std::numeric_limits<uint32_t>::max()),
MakeUintegerAccessor(&ConsumerWindow::GetSeqMax, &ConsumerWindow::SetSeqMax),
MakeUintegerChecker<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";
}
uint32_t
ConsumerWindow::GetSeqMax() const
{
return m_seqMax;
}
void
ConsumerWindow::SetSeqMax(uint32_t seqMax)
{
if (m_maxSize < 0)
m_seqMax = seqMax;
// ignore otherwise
}
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::OnData(shared_ptr<const Data> contentObject)
{
Consumer::OnData(contentObject);
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(shared_ptr<const Interest> interest)
{
Consumer::OnNack(interest);
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