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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.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 ("CcnxContentStore");
namespace ns3
{
// NS_OBJECT_ENSURE_REGISTERED (CcnxContentStore);
using namespace __ccnx_private;
TypeId
CcnxContentStore::GetTypeId (void)
{
static TypeId tid = TypeId ("ns3::CcnxContentStore")
.SetGroupName ("Ccnx")
.SetParent<Object> ()
.AddConstructor<CcnxContentStore> ()
.AddAttribute ("Size",
"Maximum number of packets that content storage can hold",
UintegerValue (100),
MakeUintegerAccessor (&CcnxContentStore::SetMaxSize,
&CcnxContentStore::GetMaxSize),
MakeUintegerChecker<uint32_t> ())
;
return tid;
}
//////////////////////////////////////////////////////////////////////
// Helper classes
//////////////////////////////////////////////////////////////////////
/**
* \ingroup ccnx
* \brief Typedef for hash index of content store container
*/
struct CcnxContentStoreByPrefix
{
typedef
CcnxContentStoreContainer::type::index<i_prefix>::type
type;
};
/**
* \ingroup ccnx
* \brief Typedef for MRU index of content store container
*/
struct CcnxContentStoreByMru
{
typedef
CcnxContentStoreContainer::type::index<i_mru>::type
type;
};
#ifdef _DEBUG
#define DUMP_INDEX_TAG i_ordered
#define DUMP_INDEX CcnxContentStoreOrderedPrefix
/**
* \ingroup ccnx
* \brief Typedef for ordered index of content store container
*/
struct CcnxContentStoreOrderedPrefix
{
typedef
CcnxContentStoreContainer::type::index<i_ordered>::type
type;
};
#else
#define DUMP_INDEX_TAG i_mru
#define DUMP_INDEX CcnxContentStoreByMru
#endif
//////////////////////////////////////////////////////////////////////
CcnxContentStoreEntry::CcnxContentStoreEntry (Ptr<CcnxContentObjectHeader> header, Ptr<const Packet> packet)
: m_header (header)
{
static CcnxContentObjectTail tail; ///< \internal for optimization purposes
m_packet = packet->Copy ();
m_packet->RemoveHeader (*header);
m_packet->RemoveTrailer (tail);
}
Ptr<Packet>
CcnxContentStoreEntry::GetFullyFormedCcnxPacket () const
{
static CcnxContentObjectTail tail; ///< \internal for optimization purposes
Ptr<Packet> packet = m_packet->Copy ();
packet->AddHeader (*m_header);
packet->AddTrailer (tail);
return packet;
}
// /// Disabled copy constructor
// CcnxContentStoreEntry::CcnxContentStoreEntry (const CcnxContentStoreEntry &o)
// {
// }
// /// Disables copy operator
// CcnxContentStoreEntry& CcnxContentStoreEntry::operator= (const CcnxContentStoreEntry &o)
// {
// return *this;
// }
CcnxContentStore::CcnxContentStore( )
: m_maxSize(100) { } // this value shouldn't matter, NS-3 should call SetSize with default value specified in AddAttribute earlier
CcnxContentStore::~CcnxContentStore( )
{ }
/// Disabled copy constructor
CcnxContentStore::CcnxContentStore (const CcnxContentStore &o)
{
}
/// Disables copy operator
CcnxContentStore& CcnxContentStore::operator= (const CcnxContentStore &o)
{
return *this;
}
Ptr<Packet>
CcnxContentStore::Lookup (Ptr<const CcnxInterestHeader> interest)
{
NS_LOG_FUNCTION_NOARGS ();
CcnxContentStoreContainer::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));
// return fully formed CCNx packet
return it->GetFullyFormedCcnxPacket ();
}
return 0;
}
void
CcnxContentStore::Add (Ptr<CcnxContentObjectHeader> header, Ptr<const Packet> packet)
{
NS_LOG_FUNCTION_NOARGS ();
CcnxContentStoreContainer::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 ();
}
else
{
// promote entry to the top
m_contentStore.get<i_mru> ().relocate (m_contentStore.get<i_mru> ().begin (),
m_contentStore.project<i_mru> (it));
}
}
void
CcnxContentStore::Print() const
{
for( DUMP_INDEX::type::iterator it=m_contentStore.get<DUMP_INDEX_TAG> ().begin ();
it != m_contentStore.get<DUMP_INDEX_TAG> ().end ();
it++
)
{
NS_LOG_INFO (it->GetName ());
}
}
} // namespace ns3