diff --git a/src/action-log.cc b/src/action-log.cc
new file mode 100644
index 0000000..cf5156a
--- /dev/null
+++ b/src/action-log.cc
@@ -0,0 +1,78 @@
+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2012-2013 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
+ *
+ * Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ *	   Zhenkai Zhu <zhenkai@cs.ucla.edu>
+ */
+
+#include "action-log.h"
+
+using namespace boost;
+using namespace std;
+
+ActionLog::ActionLog (const std::string &path, const std::string &localName)
+  : SyncLog (path)
+  , m_localName (localName)
+{
+}
+
+// local add action. remote action is extracted from content object
+void
+ActionLog::AddActionUpdate (const std::string &filename,
+                            const Hash &hash,
+                            const std::string &atime, const std::string &mtime, const std::string &ctime,
+                            int mode)
+{
+  int res = sqlite3_exec (m_db, "BEGIN TRANSACTION;", 0,0,0);
+
+  // sqlite3_stmt *stmt;
+  // res += sqlite3_prepare_v2 (m_db, "SELECT version,device_id,seq_no FROM ActionLog WHERE filename=? ORDER BY version DESC,device_id DESC LIMIT 1", -1, &stmt, 0);
+
+  // if (res != SQLITE_OK)
+  //   {
+  //     BOOST_THROW_EXCEPTION (Error::Db ()
+  //                            << errmsg_info_str ("Some error with AddActionUpdate"));
+  //   }
+
+  // sqlite3_bind_text (stmt, 1, filename.c_str (), -1);
+  // if (sqlite3_step (stmt) == SQLITE_ROW)
+  //   {
+  //     // with parent
+  //     sqlite3_int64 version = sqlite3_value_int64 (stmt, 0) + 1;
+  //     sqlite3_int64 device_id = sqlite3_value_int64 (stmt, 1);
+  //     sqlite3_int64 seq_no = sqlite3_value_int64 (stmt, 0);
+
+      
+  //   }
+  // else
+  //   {
+  //     // without parent
+      
+  //   }
+
+  res += sqlite3_exec (m_db, "END TRANSACTION;", 0,0,0);
+}
+
+void
+ActionLog::AddActionMove (const std::string &oldFile, const std::string &newFile)
+{
+}
+
+void
+ActionLog::AddActionDelete (const std::string &filename)
+{
+}