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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2011-2012 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: Xiaoyan Hu <x......u@gmail.com>
* Alexander Afanasyev <alexander.afanasyev@ucla.edu>
*/
#ifndef CCNX_CS_TRACER_H
#define CCNX_CS_TRACER_H
#include "ns3/ptr.h"
#include "ns3/simple-ref-count.h"
#include <ns3/nstime.h>
#include <ns3/event-id.h>
#include <boost/tuple/tuple.hpp>
#include <boost/shared_ptr.hpp>
#include <map>
#include <list>
namespace ns3 {
class Node;
class Packet;
namespace ndn {
class Interest;
class ContentObject;
typedef Interest InterestHeader;
typedef ContentObject ContentObjectHeader;
namespace cs {
struct Stats
{
inline void Reset ()
{
m_cacheHits = 0;
m_cacheMisses = 0;
}
double m_cacheHits;
double m_cacheMisses;
};
}
/**
* @ingroup ndn
* @brief NDN tracer for cache performance (hits and misses)
*/
class CsTracer : public SimpleRefCount<CsTracer>
{
public:
/**
* @brief Helper method to install tracers on all simulation nodes
*
* @param file File to which traces will be written
* @param averagingPeriod How often data will be written into the trace file (default, every half second)
*
* @returns a tuple of reference to output stream and list of tracers. !!! Attention !!! This tuple needs to be preserved
* for the lifetime of simulation, otherwise SEGFAULTs are inevitable
*
*/
static boost::tuple< boost::shared_ptr<std::ostream>, std::list<Ptr<CsTracer> > >
InstallAll (const std::string &file, Time averagingPeriod = Seconds (0.5));
/**
* @brief Trace constructor that attaches to the node using node pointer
* @param os reference to the output stream
* @param node pointer to the node
*/
CsTracer (boost::shared_ptr<std::ostream> os, Ptr<Node> node);
/**
* @brief Trace constructor that attaches to the node using node name
* @param os reference to the output stream
* @param nodeName name of the node registered using Names::Add
*/
CsTracer (boost::shared_ptr<std::ostream> os, const std::string &node);
/**
* @brief Destructor
*/
~CsTracer ();
/**
* @brief Print head of the trace (e.g., for post-processing)
*
* @param os reference to output stream
*/
void
PrintHeader (std::ostream &os) const;
/**
* @brief Print current trace data
*
* @param os reference to output stream
*/
void
Print (std::ostream &os) const;
private:
void
Connect ();
void
CacheHits (Ptr<const Interest>, Ptr<const ContentObject>);
void
CacheMisses (Ptr<const Interest>);
private:
void
SetAveragingPeriod (const Time &period);
void
Reset ();
void
PeriodicPrinter ();
private:
std::string m_node;
Ptr<Node> m_nodePtr;
boost::shared_ptr<std::ostream> m_os;
Time m_period;
EventId m_printEvent;
cs::Stats m_stats;
};
/**
* @brief Helper to dump the trace to an output stream
*/
inline std::ostream&
operator << (std::ostream &os, const CsTracer &tracer)
{
os << "# ";
tracer.PrintHeader (os);
os << "\n";
tracer.Print (os);
return os;
}
} // namespace ndn
} // namespace ns3
#endif // CCNX_CS_TRACER_H