rib: Integrating NRD code into NFD codebase

Change-Id: I3e548f974255f62a4680cfc6c12be3bb7a3db4d2
Refs: #1486
diff --git a/core/face-monitor.hpp b/core/face-monitor.hpp
new file mode 100644
index 0000000..6ce6595
--- /dev/null
+++ b/core/face-monitor.hpp
@@ -0,0 +1,105 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014  Regents of the University of California,
+ *                     Arizona Board of Regents,
+ *                     Colorado State University,
+ *                     University Pierre & Marie Curie, Sorbonne University,
+ *                     Washington University in St. Louis,
+ *                     Beijing Institute of Technology,
+ *                     The University of Memphis
+ *
+ * This file is part of NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD 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.
+ *
+ * NFD 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
+ * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+#ifndef NFD_CORE_FACE_MONITOR_HPP
+#define NFD_CORE_FACE_MONITOR_HPP
+
+#include "common.hpp"
+
+#include <ndn-cpp-dev/management/nfd-face-event-notification.hpp>
+
+namespace ndn {
+class Face;
+struct PendingInterestId;
+}
+
+namespace nfd {
+
+using ndn::nfd::FaceEventNotification;
+
+/**
+ * \brief Helper class to subscribe to face notification events
+ *
+ * \todo Write test cases
+ */
+class FaceMonitor : noncopyable
+{
+public:
+  typedef function<void(const ndn::nfd::FaceEventNotification&)> NotificationCallback;
+  typedef function<void()> TimeoutCallback;
+
+  typedef std::vector<NotificationCallback> NotificationCallbacks;
+  typedef std::vector<TimeoutCallback> TimeoutCallbacks;
+
+  explicit
+  FaceMonitor(ndn::Face& face);
+
+  ~FaceMonitor();
+
+  /** \brief Stops all notifications. This method  doesn't remove registered callbacks.
+   */
+  void
+  stopNotifications();
+
+  /** \brief Resumes notifications for added subscribers.
+   */
+  void
+  startNotifications();
+
+  /** \brief Removes all notification subscribers.
+   */
+  void
+  removeAllSubscribers();
+
+  /** \brief Adds a notification subscriber. This method doesn't return on timeouts.
+   */
+  void
+  addSubscriber(const NotificationCallback& notificationCallback);
+
+  /** \brief Adds a notification subscriber.
+   */
+  void
+  addSubscriber(const NotificationCallback& notificationCallback,
+                const TimeoutCallback&  timeoutCallback);
+
+private:
+  void
+  onTimeout();
+
+  void
+  onNotification(const Data& data);
+
+private:
+  ndn::Face& m_face;
+  uint64_t m_lastSequence;
+  bool m_isStopped;
+  NotificationCallbacks m_notificationCallbacks;
+  TimeoutCallbacks m_timeoutCallbacks;
+  const ndn::PendingInterestId* m_lastInterestId;
+};
+
+} // namespace nfd
+
+#endif // NFD_CORE_FACE_MONITOR_HPP