model: Adding experimental support for caching policies with probability caching
This caching can be enabled, for example, for LRU policy with caching
probability 50%:
ndnHelper.SetContentStore ("ns3::ndn::cs::Probability::Lru",
"MaxSize", "100",
"CacheProbability", "0.5");
Similar way, probability can be enabled for other existing caching policies.
diff --git a/model/cs/content-store-with-probability.h b/model/cs/content-store-with-probability.h
new file mode 100644
index 0000000..42ad716
--- /dev/null
+++ b/model/cs/content-store-with-probability.h
@@ -0,0 +1,101 @@
+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2012-2013 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_PROBABILITY_H_
+#define NDN_CONTENT_STORE_WITH_PROBABILITY_H_
+
+#include "content-store-impl.h"
+
+#include "../../utils/trie/multi-policy.h"
+#include "custom-policies/probability-policy.h"
+#include "ns3/double.h"
+#include "ns3/type-id.h"
+
+namespace ns3 {
+namespace ndn {
+namespace cs {
+
+/**
+ * @ingroup ndn-cs
+ * @brief Special content store realization that honors Freshness parameter in Data packets
+ */
+template<class Policy>
+class ContentStoreWithProbability :
+ public ContentStoreImpl< ndnSIM::multi_policy_traits< boost::mpl::vector2< ndnSIM::probability_policy_traits, Policy > > >
+{
+public:
+ typedef ContentStoreImpl< ndnSIM::multi_policy_traits< boost::mpl::vector2< ndnSIM::probability_policy_traits, Policy > > > super;
+
+ typedef typename super::policy_container::template index<0>::type probability_policy_container;
+
+ ContentStoreWithProbability () {};
+
+ static TypeId
+ GetTypeId ();
+private:
+
+ void SetCacheProbability (double probability)
+ {
+ this->getPolicy ()
+ .template get<probability_policy_container> ()
+ .set_probability (probability);
+ }
+
+ double
+ GetCacheProbability () const
+ {
+ return
+ this->getPolicy ()
+ .template get<probability_policy_container> ()
+ .get_probability ();
+ }
+};
+
+//////////////////////////////////////////
+////////// Implementation ////////////////
+//////////////////////////////////////////
+
+template<class Policy>
+TypeId
+ContentStoreWithProbability< Policy >::GetTypeId ()
+{
+ static TypeId tid = TypeId (("ns3::ndn::cs::Probability::"+Policy::GetName ()).c_str ())
+ .SetGroupName ("Ndn")
+ .SetParent<super> ()
+ .template AddConstructor< ContentStoreWithProbability< Policy > > ()
+
+ .AddAttribute ("CacheProbability",
+ "Set probability of caching in ContentStore. "
+ "If 1, every content is cached. If 0, no content is cached.",
+ DoubleValue (1.0),//(+)
+ MakeDoubleAccessor (&ContentStoreWithProbability< Policy >::GetCacheProbability,
+ &ContentStoreWithProbability< Policy >::SetCacheProbability),
+ MakeDoubleChecker<double> ())
+ ;
+
+ return tid;
+}
+
+
+} // namespace cs
+} // namespace ndn
+} // namespace ns3
+
+#endif // NDN_CONTENT_STORE_WITH_PROBABILITY_H_