diff --git a/src/dispatcher.h b/src/dispatcher.h
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+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *	   Zhenkai Zhu <zhenkai@cs.ucla.edu>
+ * Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef DISPATCHER_H
+#define DISPATCHER_H
+
+#include "action-log.h"
+#include "sync-core.h"
+#include "ccnx-wrapper.h"
+#include "executor.h"
+#include "object-db.h"
+#include "object-manager.h"
+#include <boost/function.hpp>
+#include <boost/filesystem.hpp>
+#include <boost/shared_ptr.hpp>
+#include <map>
+
+typedef boost::shared_ptr<ActionItem> ActionItemPtr;
+
+// TODO:
+// This class lacks a permanent table to store the files in fetching process
+// and fetch the missing pieces for those in the table after the application launches
+class Dispatcher
+{
+public:
+  typedef enum
+  {
+    UPDATE = 0,
+    DELETE = 1
+  } ActionType;
+
+  // sharedFolder is the name to be used in NDN name;
+  // rootDir is the shared folder dir in local file system;
+  Dispatcher(const boost::filesystem::path &path, const std::string &localUserName,  const Ccnx::Name &localPrefix, const std::string &sharedFolder, const boost::filesystem::path &rootDir, const Ccnx::CcnxWrapperPtr &ccnx, const SchedulerPtr &scheduler, int poolSize = 2);
+  ~Dispatcher();
+
+  // ----- Callbacks, they only submit the job to executor and immediately return so that event processing thread won't be blocked for too long -------
+
+  // callback to process local file change
+  void
+  fileChangedCallback(const boost::filesystem::path &relativeFilepath, ActionType type);
+
+  // callback to process remote sync state change
+  void
+  syncStateChangedCallback(const SyncStateMsgPtr &stateMsg);
+
+  // callback to process remote action data
+  void
+  actionReceivedCallback(const ActionItemPtr &actionItem);
+
+  // callback to porcess file data
+  void
+  fileSegmentReceivedCallback(const Ccnx::Name &name, const Ccnx::Bytes &content);
+
+  // callback to assemble file
+  void
+  fileReadyCallback(const Ccnx::Name &fileNamePrefix);
+
+private:
+  void
+  fileChanged(const boost::filesystem::path &relativeFilepath, ActionType type);
+
+  void
+  syncStateChanged(const SyncStateMsgPtr &stateMsg);
+
+  void
+  actionReceived(const ActionItemPtr &actionItem);
+
+  void
+  fileSegmentReceived(const Ccnx::Name &name, const Ccnx::Bytes &content);
+
+  void
+  fileReady(const Ccnx::Name &fileNamePrefix);
+
+private:
+  SyncCore *m_core;
+  ActionLogPtr m_log;
+  CcnxWrapperPtr m_ccnx;
+  boost::filesystem::path m_rootDir;
+  Executor m_executor;
+  ObjectManager m_objectManager;
+  Ccnx::Name m_localUserName;
+  // maintain object db ptrs so that we don't need to create them
+  // for every fetched segment of a file
+  map<Ccnx::Name, ObjectDbPtr> m_objectDbMap;
+  std::string m_sharedFolder;
+};
+
+namespace Error
+{
+  struct Dispatcher : virtual boost::exception, virtual std::exception {};
+  typedef boost::error_info<struct tag_errmsg, std::string> error_info_str;
+}
+
+#endif // DISPATCHER_H
+