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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: Ilya Moiseenko <iliamo@cs.ucla.edu>
* Alexander Afanasyev <alexander.afanasyev@ucla.edu>
*/
#include "ccnx-content-store-lru.h"
#include "ns3/log.h"
#include "ns3/packet.h"
#include "ns3/ccnx-interest-header.h"
#include "ns3/ccnx-content-object-header.h"
#include "ns3/uinteger.h"
NS_LOG_COMPONENT_DEFINE ("CcnxContentStoreLru");
namespace ns3
{
NS_OBJECT_ENSURE_REGISTERED (CcnxContentStoreLru);
using namespace __ccnx_private;
TypeId
CcnxContentStoreLru::GetTypeId (void)
{
static TypeId tid = TypeId ("ns3::CcnxContentStoreLru")
.SetGroupName ("Ccnx")
.SetParent<CcnxContentStore> ()
.AddConstructor<CcnxContentStoreLru> ()
.AddAttribute ("Size",
"Maximum number of packets that content storage can hold",
UintegerValue (100),
MakeUintegerAccessor (&CcnxContentStoreLru::SetMaxSize,
&CcnxContentStoreLru::GetMaxSize),
MakeUintegerChecker<uint32_t> ())
;
return tid;
}
void
CcnxContentStoreLru::SetMaxSize (uint32_t maxSize)
{
m_maxSize = maxSize;
}
uint32_t
CcnxContentStoreLru::GetMaxSize () const
{
return m_maxSize;
}
//////////////////////////////////////////////////////////////////////
// Helper classes
//////////////////////////////////////////////////////////////////////
/**
* \ingroup ccnx
* \brief Typedef for hash index of content store container
*/
struct CcnxContentStoreByPrefix
{
typedef
CcnxContentStoreLruContainer::type::index<i_prefix>::type
type;
};
CcnxContentStoreLru::CcnxContentStoreLru ()
: m_maxSize (100)
{ } // this value shouldn't matter, NS-3 should call SetSize with default value specified in AddAttribute earlier
CcnxContentStoreLru::~CcnxContentStoreLru ()
{ }
boost::tuple<Ptr<Packet>, Ptr<const CcnxContentObjectHeader>, Ptr<const Packet> >
CcnxContentStoreLru::Lookup (Ptr<const CcnxInterestHeader> interest)
{
NS_LOG_FUNCTION (this << interest->GetName ());
CcnxContentStoreLruContainer::type::iterator it = m_contentStore.get<i_prefix> ().find (interest->GetName ());
if (it != m_contentStore.end ())
{
// promote entry to the top
m_contentStore.get<i_mru> ().relocate (m_contentStore.get<i_mru> ().begin (),
m_contentStore.project<i_mru> (it));
m_cacheHitsTrace (interest, it->GetHeader ());
// return fully formed CCNx packet
return boost::make_tuple (it->GetFullyFormedCcnxPacket (), it->GetHeader (), it->GetPacket ());
}
m_cacheMissesTrace (interest);
return boost::tuple<Ptr<Packet>, Ptr<CcnxContentObjectHeader>, Ptr<Packet> > (0, 0, 0);
}
bool
CcnxContentStoreLru::Add (Ptr<CcnxContentObjectHeader> header, Ptr<const Packet> packet)
{
NS_LOG_FUNCTION (this << header->GetName ());
CcnxContentStoreLruContainer::type::iterator it = m_contentStore.get<i_prefix> ().find (header->GetName ());
if (it == m_contentStore.end ())
{ // add entry to the top
m_contentStore.get<i_mru> ().push_front (CcnxContentStoreEntry (header, packet));
if (m_contentStore.size () > m_maxSize)
m_contentStore.get<i_mru> ().pop_back ();
return false;
}
else
{
/// @todo Wrong!!! Record should be updated and relocated, not just relocated
// promote entry to the top
m_contentStore.get<i_mru> ().relocate (m_contentStore.get<i_mru> ().begin (),
m_contentStore.project<i_mru> (it));
return true;
}
}
void
CcnxContentStoreLru::Print() const
{
BOOST_FOREACH (const CcnxContentStoreEntry &entry, m_contentStore.get<i_mru> ())
{
NS_LOG_INFO (entry.GetName ());
}
}
} // namespace ns3