diff --git a/src/handles/write-handle.hpp b/src/handles/write-handle.hpp
new file mode 100644
index 0000000..075e78c
--- /dev/null
+++ b/src/handles/write-handle.hpp
@@ -0,0 +1,225 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014,  Regents of the University of California.
+ *
+ * This file is part of NDN repo-ng (Next generation of NDN repository).
+ * See AUTHORS.md for complete list of repo-ng authors and contributors.
+ *
+ * repo-ng 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.
+ *
+ * repo-ng 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
+ * repo-ng, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef REPO_HANDLES_WRITE_HANDLE_HPP
+#define REPO_HANDLES_WRITE_HANDLE_HPP
+
+#include "base-handle.hpp"
+
+#include <queue>
+
+namespace repo {
+
+using std::map;
+using std::pair;
+using std::queue;
+
+/**
+ * @brief WriteHandle provides basic credit based congestion control.
+ *
+ * First repo sends interests of credit number and then credit will be 0.
+ *
+ * If a data comes, credit++ and sends a interest then credit--.
+ *
+ * If the interest timeout, repo will retry and send interest in retrytimes.
+ *
+ * If one interest timeout beyond retrytimes, the fetching process will terminate.
+ *
+ * Another case is that if command will insert segmented data without EndBlockId.
+ *
+ * The repo will keep fetching data in noendTimeout time.
+ *
+ * If data returns with FinalBlockId, this detecting timeout process will terminate.
+ *
+ * If client sends a insert check command, the noendTimeout timer will be set to 0.
+ *
+ * If repo cannot get FinalBlockId in noendTimeout time, the fetching process will terminate.
+ */
+class WriteHandle : public BaseHandle
+{
+
+public:
+  class Error : public BaseHandle::Error
+  {
+  public:
+    explicit
+    Error(const std::string& what)
+      : BaseHandle::Error(what)
+    {
+    }
+  };
+
+
+public:
+  WriteHandle(Face& face, StorageHandle& storageHandle, KeyChain& keyChain,
+              Scheduler& scheduler, CommandInterestValidator& validator);
+
+  virtual void
+  listen(const Name& prefix);
+
+private:
+  /**
+  * @brief Information of insert process including variables for response
+  *        and credit based flow control
+  */
+  struct ProcessInfo
+  {
+    //ProcessId id;
+    RepoCommandResponse response;
+    queue<SegmentNo> nextSegmentQueue;  ///< queue of waiting segment
+                                        ///  to be sent when having credits
+    SegmentNo nextSegment;  ///< last segment put into the nextSegmentQueue
+    map<SegmentNo, int> retryCounts;  ///< to store retrying times of timeout segment
+    int credit;  ///< congestion control credits of process
+
+    /**
+     * @brief the latest time point at which EndBlockId must be determined
+     *
+     * Segmented fetch process will terminate if EndBlockId cannot be
+     * determined before this time point.
+     * It is initialized to now()+noEndTimeout when segmented fetch process begins,
+     * and reset to now()+noEndTimeout each time an insert status check command is processed.
+     */
+    ndn::time::steady_clock::TimePoint noEndTime;
+  };
+
+private: // insert command
+  /**
+   * @brief handle insert commands
+   */
+  void
+  onInterest(const Name& prefix, const Interest& interest);
+
+  void
+  onValidated(const shared_ptr<const Interest>& interest, const Name& prefix);
+
+  void
+  onValidationFailed(const shared_ptr<const Interest>& interest);
+
+  /**
+   * @brief insert command prefix register failed
+   */
+  void
+  onRegisterFailed(const Name& prefix, const std::string& reason);
+
+private: // single data fetching
+  /**
+   * @brief fetch one data
+   */
+  void
+  onData(const Interest& interest, Data& data, ProcessId processId);
+
+  /**
+   * @brief handle when fetching one data timeout
+   */
+  void
+  onTimeout(const Interest& interest, ProcessId processId);
+
+  void
+  processSingleInsertCommand(const Interest& interest, RepoCommandParameter& parameter);
+
+private:  // segmented data fetching
+  /**
+   * @brief fetch segmented data
+   */
+  void
+  onSegmentData(const Interest& interest, Data& data, ProcessId processId);
+
+  /**
+   * @brief Timeout when fetching segmented data. Data can be fetched RETRY_TIMEOUT times.
+   */
+  void
+  onSegmentTimeout(const Interest& interest, ProcessId processId);
+
+  /**
+   * @brief initiate fetching segmented data
+   */
+  void
+  segInit(ProcessId processId, const RepoCommandParameter& parameter);
+
+  /**
+   * @brief control for sending interests in function onSegmentData()
+   */
+  void
+  onSegmentDataControl(ProcessId processId, const Interest& interest);
+
+  /**
+   * @brief control for sending interest in function onSegmentTimeout
+   */
+  void
+  onSegmentTimeoutControl(ProcessId processId, const Interest& interest);
+
+  void
+  processSegmentedInsertCommand(const Interest& interest, RepoCommandParameter& parameter);
+
+  /**
+   * @brief extends noEndTime of process if not noEndTimeout, set StatusCode 405
+   *
+   * called by onCheckValidated() if there is no EndBlockId. If not noEndTimeout,
+   * extends noEndTime of process. If noEndTimeout, set status code 405 as noEndTimeout.
+   */
+  void
+  extendNoEndTime(ProcessInfo& process);
+
+private: // insert state check command
+  /**
+   * @brief handle insert check command
+   */
+  void
+  onCheckInterest(const Name& prefix, const Interest& interest);
+
+  /**
+   * @brief insert check command prefix register failed
+   */
+  void
+  onCheckRegisterFailed(const Name& prefix, const std::string& reason);
+
+  void
+  onCheckValidated(const shared_ptr<const Interest>& interest, const Name& prefix);
+
+  void
+  onCheckValidationFailed(const shared_ptr<const Interest>& interest);
+
+private:
+  void
+  deleteProcess(ProcessId processId);
+
+  /**
+   * @brief schedule a event to delete the process
+   */
+  void
+  deferredDeleteProcess(ProcessId processId);
+
+  void
+  negativeReply(const Interest& interest, int statusCode);
+
+private:
+
+  CommandInterestValidator& m_validator;
+
+  map<ProcessId, ProcessInfo> m_processes;
+
+  int m_retryTime;
+  int m_credit;
+  ndn::time::milliseconds m_noEndTimeout;
+};
+
+} // namespace repo
+
+#endif // REPO_HANDLES_WRITE_HANDLE_HPP