diff --git a/nsync/src/sync-full-state.h b/nsync/src/sync-full-state.h
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+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2012 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
+ *
+ * Author: Zhenkai Zhu <zhenkai@cs.ucla.edu>
+ *         Chaoyi Bian <bcy@pku.edu.cn>
+ *	   Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef SYNC_FULL_STATE_H
+#define SYNC_FULL_STATE_H
+
+#include <ndn-cpp-dev/util/time.hpp>
+#include "sync-state.h"
+
+namespace Sync {
+
+class FullState;
+typedef boost::shared_ptr<FullState> FullStatePtr;
+typedef boost::shared_ptr<FullState> FullStateConstPtr;
+
+
+/**
+ * \ingroup sync
+ * @brief Cumulative SYNC state
+ */
+class FullState : public State
+{
+public:
+  /**
+   * @brief Default constructor
+   */
+  FullState ();
+  virtual ~FullState ();
+
+  /**
+   * @brief Get time period since last state update
+   *
+   * This value can be used to randomize reconciliation waiting time in SyncApp
+   */
+  ndn::time::Duration
+  getTimeFromLastUpdate () const;
+
+  /**
+   * @brief Obtain a read-only copy of the digest
+   *
+   * If m_digest is 0, then it is automatically created.  On every update and removal, m_digest is reset to 0
+   */
+  DigestConstPtr
+  getDigest ();
+  
+  // from State
+  virtual boost::tuple<bool/*inserted*/, bool/*updated*/, SeqNo/*oldSeqNo*/>
+  update (NameInfoConstPtr info, const SeqNo &seq);
+
+  virtual bool
+  remove (NameInfoConstPtr info);
+  
+private:
+  ndn::time::Point m_lastUpdated; ///< @brief Time when state was updated last time
+  DigestPtr m_digest;
+};
+
+} // Sync
+
+#endif // SYNC_STATE_H