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diff --git a/src/UTMetadataRequestTracker.h b/src/UTMetadataRequestTracker.h
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+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2009 Tatsuhiro Tsujikawa
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#ifndef _UT_METADATA_REQUEST_TRACKER_H_
+#define _UT_METADATA_REQUEST_TRACKER_H_
+
+#include "common.h"
+
+#include <vector>
+
+#include "TimeA2.h"
+
+namespace aria2 {
+
+class Logger;
+
+class UTMetadataRequestTracker {
+private:
+  struct RequestEntry {
+    size_t _index;
+    Time _dispatchedTime;
+
+    RequestEntry(size_t index):_index(index) {}
+
+    bool elapsed(time_t t) const
+    {
+      return _dispatchedTime.elapsed(t);
+    }
+
+    bool operator==(const RequestEntry& e) const
+    {
+      return _index == e._index;
+    }
+  };
+
+  std::vector<RequestEntry> _trackedRequests;
+
+  Logger* _logger;
+public:
+  UTMetadataRequestTracker();
+
+  // Add request index to tracking list.
+  void add(size_t index);
+
+  // Returns true if request index is tracked.
+  bool tracks(size_t index);
+
+  // Remove index from tracking list.
+  void remove(size_t index);
+
+  // Returns all tracking indexes.
+  std::vector<size_t> getAllTrackedIndex() const;
+
+  // Removes request index which is timed out and returns their indexes.
+  std::vector<size_t> removeTimeoutEntry();
+
+  // Returns the number of tracking list.
+  size_t count() const
+  {
+    return _trackedRequests.size();
+  }
+
+  // Returns the number of additional index this tracker can track.
+  size_t avail() const;
+};
+
+} // namespace aria2
+
+#endif // _UT_METADATA_REQUEST_TRACKER_H_