Chronoshare should still watch the filesystem even the connection is closed.

Used only one ioService to control connection and file watch

Change-Id: Ib54d5f839acecc89f7f2391bb8b2590eac362ffe
diff --git a/src/io-service-manager.cpp b/src/io-service-manager.cpp
new file mode 100644
index 0000000..8a735aa
--- /dev/null
+++ b/src/io-service-manager.cpp
@@ -0,0 +1,67 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2017, Regents of the University of California.
+ *
+ * This file is part of ChronoShare, a decentralized file sharing application over NDN.
+ *
+ * ChronoShare 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.
+ *
+ * ChronoShare 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 copies of the GNU General Public License along with
+ * ChronoShare, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ChronoShare authors and contributors.
+ */
+
+#include "io-service-manager.hpp"
+#include "core/logging.hpp"
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/thread/thread.hpp>
+
+namespace ndn {
+namespace chronoshare {
+
+using namespace ndn::chronoshare;
+
+_LOG_INIT(FaceService);
+
+IoServiceManager::IoServiceManager(boost::asio::io_service& io)
+  : m_ioService(io)
+  , m_connect(true)
+{
+}
+
+IoServiceManager::~IoServiceManager()
+{
+  handle_stop();
+}
+
+void
+IoServiceManager::run()
+{
+  while (m_connect) {
+    try {
+      m_ioServiceWork.reset(new boost::asio::io_service::work(m_ioService));
+      m_ioService.reset();
+      m_ioService.run();
+    }
+    catch (...) {
+      _LOG_DEBUG("error while connecting to the forwarder");
+    }
+  }
+}
+
+void
+IoServiceManager::handle_stop()
+{
+  m_connect = false;
+  m_ioService.stop();
+}
+
+} // namespace chronoshare
+} // namespace ndn
diff --git a/src/io-service-manager.hpp b/src/io-service-manager.hpp
new file mode 100644
index 0000000..016ff50
--- /dev/null
+++ b/src/io-service-manager.hpp
@@ -0,0 +1,61 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2017, Regents of the University of California.
+ *
+ * This file is part of ChronoShare, a decentralized file sharing application over NDN.
+ *
+ * ChronoShare 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.
+ *
+ * ChronoShare 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 copies of the GNU General Public License along with
+ * ChronoShare, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ChronoShare authors and contributors.
+ */
+
+#ifndef CHRONOSHARE_SRC_IO_SERVICE_MANAGER_HPP
+#define CHRONOSHARE_SRC_IO_SERVICE_MANAGER_HPP
+
+#include <ndn-cxx/face.hpp>
+#include <boost/asio/io_service.hpp>
+
+#define RECONNECTION_TIME 30000
+
+namespace ndn {
+namespace chronoshare {
+
+/// The class prevent face loss connection to NFD.
+class IoServiceManager : private boost::noncopyable
+{
+public:
+  /// Construct the server to listen on the specified TCP address and port, and
+  /// serve up files from the given directory.
+
+  IoServiceManager(boost::asio::io_service& io);
+
+  ~IoServiceManager();
+
+  /// Run the service's io_service loop.
+  void
+  run();
+
+  /// Handle a request to stop the service.
+  void
+  handle_stop();
+
+private:
+  /// the IO service used by NFD connection.
+  boost::asio::io_service& m_ioService;
+  std::unique_ptr<boost::asio::io_service::work> m_ioServiceWork;
+  bool m_connect;
+};
+
+} // namespace chronoshare
+} // namespace ndn
+
+#endif // CHRONOSHARE_SRC_IO_SERVICE_MANAGER_HPP