Create FetchingStrategyManager class

Change-Id: Id70a9df23667bc2f1ef4500b9cca88d2f0bd9ccd
Refs: #3506
diff --git a/src/fetching-strategy-manager.hpp b/src/fetching-strategy-manager.hpp
new file mode 100644
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+++ b/src/fetching-strategy-manager.hpp
@@ -0,0 +1,93 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+* Copyright (c) 2016 Regents of the University of California.
+*
+* This file is part of the nTorrent codebase.
+*
+* nTorrent is free software: you can redistribute it and/or modify it under the
+* terms of the GNU Lesser General Public License as published by the Free Software
+* Foundation, either version 3 of the License, or (at your option) any later version.
+*
+* nTorrent 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 Lesser General Public License for more details.
+*
+* You should have received copies of the GNU General Public License and GNU Lesser
+* General Public License along with nTorrent, e.g., in COPYING.md file. If not, see
+* <http://www.gnu.org/licenses/>.
+*
+* See AUTHORS for complete list of nTorrent authors and contributors.
+*/
+
+#ifndef FETCHING_STRATEGY_MANAGER_HPP
+#define FETCHING_STRATEGY_MANAGER_HPP
+
+#include <ndn-cxx/interest.hpp>
+#include <ndn-cxx/data.hpp>
+
+namespace ndn {
+namespace ntorrent {
+
+class FetchingStrategyManager {
+  public:
+    /**
+     * @brief Default Constructor
+     */
+    FetchingStrategyManager() = default;
+
+    /**
+     * @brief Class Destructor
+     */
+    virtual
+    ~FetchingStrategyManager() = default;
+
+    /**
+     * @brief Method called to start the torrent downloading
+     */
+    virtual void
+    start() = 0;
+
+    /**
+     * @brief Method called to pause the torrent downloading
+     */
+    virtual void
+    pause() = 0;
+
+    /**
+     * @brief Method called to continue the torrent downloading
+     */
+    virtual void
+    resume() = 0;
+
+    /**
+     * @brief Struct representing the status of the downloading
+     *  process that will be passed to the application layer
+     */
+    struct status {
+      double downloadedPercent;
+    };
+
+  private:
+    /**
+     * @brief Callback to be called when data is received
+     */
+    virtual void
+    onDataPacketReceived(const ndn::Data& data) = 0;
+
+    /**
+     * @brief Callback to be called when data retrieval failed
+     */
+    virtual void
+    onDataRetrievalFailure(const ndn::Interest& interest, const std::string& errorCode) = 0;
+
+    /**
+     * @brief Callback to be called when a file manifest is received
+     */
+    virtual void
+    onManifestReceived(const std::vector<Name>& packetNames) = 0;
+};
+
+} // namespace ntorrent
+} // namespace ndn
+
+#endif // FETCHING_STRATEGY_MANAGER_HPP