src: Implement packet statistics collection

refs: #2955, #2956

Change-Id: I57476a63562dbd378e566ad0280c89ccc5883e3e
diff --git a/src/statistics.hpp b/src/statistics.hpp
new file mode 100644
index 0000000..435938f
--- /dev/null
+++ b/src/statistics.hpp
@@ -0,0 +1,80 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2017,  The University of Memphis,
+ *                           Regents of the University of California,
+ *                           Arizona Board of Regents.
+ *
+ * This file is part of NLSR (Named-data Link State Routing).
+ * See AUTHORS.md for complete list of NLSR authors and contributors.
+ *
+ * NLSR is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * NLSR 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
+ * NLSR, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+#ifndef NLSR_STATISTICS_HPP
+#define NLSR_STATISTICS_HPP
+
+#include <map>
+
+namespace nlsr {
+
+class Statistics
+{
+
+public:
+  enum class PacketType {
+    SENT_HELLO_INTEREST,
+    SENT_HELLO_DATA,
+    RCV_HELLO_INTEREST,
+    RCV_HELLO_DATA,
+    SENT_LSA_INTEREST,
+    SENT_ADJ_LSA_INTEREST,
+    SENT_COORD_LSA_INTEREST,
+    SENT_NAME_LSA_INTEREST,
+    SENT_LSA_DATA,
+    SENT_ADJ_LSA_DATA,
+    SENT_COORD_LSA_DATA,
+    SENT_NAME_LSA_DATA,
+    RCV_LSA_INTEREST,
+    RCV_ADJ_LSA_INTEREST,
+    RCV_COORD_LSA_INTEREST,
+    RCV_NAME_LSA_INTEREST,
+    RCV_LSA_DATA,
+    RCV_ADJ_LSA_DATA,
+    RCV_COORD_LSA_DATA,
+    RCV_NAME_LSA_DATA
+  };
+
+  size_t
+  get(PacketType) const;
+
+  void
+  resetAll();
+
+  void
+  increment(PacketType);
+
+  const std::map<PacketType,int>&
+  getCounter() const
+  {
+    return m_packetCounter;
+  }
+
+private:
+  std::map<PacketType,int> m_packetCounter;
+};
+
+std::ostream&
+operator<<(std::ostream&, const Statistics& stats);
+
+} // namespace nlsr
+
+#endif // NLSR_STATISTICS_HPP