src: Recreating face in case of face deletion by NFD

Change-Id: Idd1d0b7f521e574ace38d6f671a682622d98209d
diff --git a/src/face-monitor.hpp b/src/face-monitor.hpp
new file mode 100644
index 0000000..1344f60
--- /dev/null
+++ b/src/face-monitor.hpp
@@ -0,0 +1,65 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014  University of Memphis,
+ *                     Regents of the University of California
+ *
+ * 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/>.
+ *
+ * \author A K M Mahmudul Hoque <ahoque1@memphis.edu>
+ *
+ **/
+#ifndef FACE_MONITOR_HPP
+#define FACE_MONITOR_HPP
+
+#include <ndn-cxx/face.hpp>
+#include <ndn-cxx/management/nfd-face-event-notification.hpp>
+
+namespace nlsr {
+
+class FaceMonitor
+{
+public:
+  typedef ndn::function<void(const ndn::nfd::FaceEventNotification&)> NotificationCallback;
+  typedef ndn::function<void()> TimeoutCallback;
+
+  FaceMonitor(boost::asio::io_service& ioService, const NotificationCallback& notificationCallBack)
+    : m_face(ioService)
+    , m_notificationCallBack(notificationCallBack)
+  {
+  }
+
+  ~FaceMonitor()
+  {
+  }
+
+  void
+  startNotification();
+
+private:
+  void
+  onTimeout();
+
+  void
+  onData(const ndn::Data& data);
+
+private:
+  ndn::Face m_face;
+  NotificationCallback m_notificationCallBack;
+  uint64_t m_lastSequence;
+};
+
+} // namespace nlsr
+
+ #endif //FACE_MONITOR_HPP