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/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 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: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
*/
#ifndef NDN_CONTENT_STORE_WITH_FRESHNESS_H_
#define NDN_CONTENT_STORE_WITH_FRESHNESS_H_
#include "content-store-impl.h"
#include "../../utils/trie/multi-policy.h"
#include "../../utils/trie/freshness-policy.h"
namespace ns3 {
namespace ndn {
namespace cs {
template<class Policy>
class ContentStoreWithFreshness :
public ContentStoreImpl< ndnSIM::multi_policy_traits< boost::mpl::vector2< Policy, ndnSIM::freshness_policy_traits > > >
{
public:
typedef ContentStoreImpl< ndnSIM::multi_policy_traits< boost::mpl::vector2< Policy, ndnSIM::freshness_policy_traits > > > super;
typedef typename super::policy_container::template index<1>::type freshness_policy_container;
static TypeId
GetTypeId ();
virtual inline bool
Add (Ptr<const ContentObjectHeader> header, Ptr<const Packet> packet);
private:
inline void
CleanExpired ();
inline void
RescheduleCleaning ();
private:
static LogComponent g_log; ///< @brief Logging variable
EventId m_cleanEvent;
Time m_scheduledCleaningTime;
};
//////////////////////////////////////////
////////// Implementation ////////////////
//////////////////////////////////////////
template<class Policy>
LogComponent
ContentStoreWithFreshness< Policy >::g_log = LogComponent (("ndn.cs.Freshness." + Policy::GetName ()).c_str ());
template<class Policy>
TypeId
ContentStoreWithFreshness< Policy >::GetTypeId ()
{
static TypeId tid = TypeId (("ns3::ndn::cs::Freshness::"+Policy::GetName ()).c_str ())
.SetGroupName ("Ndn")
.SetParent<super> ()
.template AddConstructor< ContentStoreWithFreshness< Policy > > ()
// trace stuff here
;
return tid;
}
template<class Policy>
inline bool
ContentStoreWithFreshness< Policy >::Add (Ptr<const ContentObjectHeader> header, Ptr<const Packet> packet)
{
bool ok = super::Add (header, packet);
if (!ok) return false;
NS_LOG_DEBUG (header->GetName () << " added to cache");
RescheduleCleaning ();
return true;
}
template<class Policy>
inline void
ContentStoreWithFreshness< Policy >::RescheduleCleaning ()
{
const freshness_policy_container &freshness = this->getPolicy ().template get<freshness_policy_container> ();
if (freshness.size () > 0)
{
Time nextStateTime = freshness_policy_container::policy_base::get_freshness (&(*freshness.begin ()));
if (m_scheduledCleaningTime.IsZero () || // if not yet scheduled
m_scheduledCleaningTime > nextStateTime) // if new item expire sooner than already scheduled
{
if (m_cleanEvent.IsRunning ())
{
Simulator::Remove (m_cleanEvent); // just canceling would not clean up list of events
}
// NS_LOG_DEBUG ("Next event in: " << (nextStateTime - Now ()).ToDouble (Time::S) << "s");
m_cleanEvent = Simulator::Schedule (nextStateTime - Now (), &ContentStoreWithFreshness< Policy >::CleanExpired, this);
m_scheduledCleaningTime = nextStateTime;
}
}
else
{
if (m_cleanEvent.IsRunning ())
{
Simulator::Remove (m_cleanEvent); // just canceling would not clean up list of events
}
}
}
template<class Policy>
inline void
ContentStoreWithFreshness< Policy >::CleanExpired ()
{
freshness_policy_container &freshness = this->getPolicy ().template get<freshness_policy_container> ();
// NS_LOG_LOGIC (">> Cleaning: Total number of items:" << this->getPolicy ().size () << ", items with freshness: " << freshness.size ());
Time now = Simulator::Now ();
while (!freshness.empty ())
{
typename freshness_policy_container::iterator entry = freshness.begin ();
if (freshness_policy_container::policy_base::get_freshness (&(*entry)) <= now) // is the record stale?
{
super::erase (&(*entry));
}
else
break; // nothing else to do. All later records will not be stale
}
// NS_LOG_LOGIC ("<< Cleaning: Total number of items:" << this->getPolicy ().size () << ", items with freshness: " << freshness.size ());
m_scheduledCleaningTime = Time ();
RescheduleCleaning ();
}
} // namespace cs
} // namespace ndn
} // namespace ns3
#endif // NDN_CONTENT_STORE_WITH_FRESHNESS_H_