diff --git a/src/group-manager-db.hpp b/src/group-manager-db.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2015,  Regents of the University of California
+ *
+ * This file is part of ndn-group-encrypt (Group-based Encryption Protocol for NDN).
+ * See AUTHORS.md for complete list of ndn-group-encrypt authors and contributors.
+ *
+ * ndn-group-encrypt 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.
+ *
+ * ndn-group-encrypt 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
+ * ndn-group-encrypt, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author Zhiyi Zhang <dreamerbarrychang@gmail.com>
+ */
+
+#ifndef GEP_GROUP_MANAGER_DB_HPP
+#define GEP_GROUP_MANAGER_DB_HPP
+
+#include "schedule.hpp"
+
+namespace ndn {
+namespace gep {
+
+/**
+ * @brief GroupManagerDB is a class to manage the database of group manager.
+ *
+ * It contains two tables to store Schedules and Members
+ */
+class GroupManagerDB
+{
+public:
+  class Error : public std::runtime_error
+  {
+  public:
+    explicit
+    Error(const std::string& what)
+      : std::runtime_error(what)
+    {
+    }
+  };
+
+public:
+  explicit
+  GroupManagerDB(const std::string& dbDir);
+
+  ~GroupManagerDB();
+
+public:
+  ////////////////////////////////////////////////////// schedule management
+
+  /**
+   * @brief Check if there is a schedule with @p name
+   */
+  bool
+  hasSchedule(const std::string& name) const;
+
+  /**
+   * @brief List all the names of the schedules
+   * @return A list of the name of all schedules.
+   */
+  std::list<std::string>
+  listAllScheduleNames() const;
+
+  /**
+   * @brief Get a schedule with @p name.
+   * @throw Error if the schedule does not exist
+   */
+  Schedule
+  getSchedule(const std::string& name) const;
+
+  /**
+   * @brief Get member information of a schedule with @p name.
+   * The member information include member name and certificate.
+   */
+  std::map<Name, Data>
+  getScheduleMembers(const std::string& name) const;
+
+  /**
+   * @brief Add a @p schedule with @p name
+   * @pre Name.length() != 0
+   *
+   * @throw Error if add operation fails, e.g., a schedule with the same name already exists
+   */
+  void
+  addSchedule(const std::string& name, const Schedule& schedule);
+
+  /**
+   * @brief Delete the schedule with @p name
+   */
+  void
+  deleteSchedule(const std::string& name);
+
+  /**
+   * @brief Rename a schedule with @p oldName to @p newName
+   * @pre newName.length() != 0
+   *
+   * @throw Error if update operation fails, e.g., a schedule with @p newName already exists
+   */
+  void
+  renameSchedule(const std::string& oldName, const std::string& newName);
+
+  /**
+   * @brief Update the schedule with @p name and replace the old object with @p schedule
+   *
+   * if no schedule with @p name exists, a new schedule
+   * with @p name and @p schedule will be added to database
+   */
+  void
+  updateSchedule(const std::string& name, const Schedule& schedule);
+
+  ////////////////////////////////////////////////////// member management
+
+  /**
+   * @brief Check if there is a member with name @p identity
+   */
+  bool
+  hasMember(const Name& identity) const;
+
+  /**
+   * @brief List all the members
+   */
+  std::list<Name>
+  listAllMembers() const;
+
+  /**
+   * @brief Get the certificate of the member with name @p identity
+   *
+   * @throw Error if there is no member with name @p identity in database
+   */
+  Data
+  getMemberCert(const Name& identity) const;
+
+  /**
+   * @brief Get the schedule name of a member with name @p identity
+   *
+   * @throw Error if there is no member with name @p identity in database
+   */
+  std::string
+  getMemberSchedule(const Name& identity) const;
+
+  /**
+   * @brief Add a new member with @p certificate into a schedule with name @p scheduleName.
+   *
+   * @throw Error when there's no schedule named @p scheduleName
+   * @throw Error if add operation fails, e.g., a member with the same name exists
+   */
+  void
+  addMember(const std::string& scheduleName, const Data& certificate);
+
+  /**
+   * @brief Change the schedule of a member with name @p identity to a schedule with @p scheduleName
+   *
+   * @throw Error when there's no schedule named @p scheduleName
+   */
+  void
+  updateMemberSchedule(const Name& identity, const std::string& scheduleName);
+
+  /**
+   * @brief Delete a member with name @p identity from database
+   */
+  void
+  deleteMember(const Name& identity);
+
+private:
+  class Impl;
+  unique_ptr<Impl> m_impl;
+};
+
+} // namespace gep
+} // namespace ndn
+
+#endif // GEP_GROUP_MANAGER_DB_HPP