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diff --git a/src/UTMetadataRequestFactory.cc b/src/UTMetadataRequestFactory.cc
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+++ b/src/UTMetadataRequestFactory.cc
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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 --> */
+#include "UTMetadataRequestFactory.h"
+#include "PieceStorage.h"
+#include "DownloadContext.h"
+#include "Peer.h"
+#include "BtMessageDispatcher.h"
+#include "BtMessageFactory.h"
+#include "UTMetadataRequestExtensionMessage.h"
+#include "UTMetadataRequestTracker.h"
+#include "BtMessage.h"
+#include "LogFactory.h"
+
+namespace aria2 {
+
+UTMetadataRequestFactory::UTMetadataRequestFactory():
+  _logger(LogFactory::getInstance()) {}
+
+void UTMetadataRequestFactory::create
+(std::deque<SharedHandle<BtMessage> >& msgs, size_t num,
+ const SharedHandle<PieceStorage>& pieceStorage)
+{
+  for(size_t index = 0; index < _dctx->getNumPieces() && num; ++index) {
+    SharedHandle<Piece> p = pieceStorage->getMissingPiece(index);
+    if(p.isNull()) {
+      _logger->debug("ut_metadata piece %lu is used or already acquired.");
+      continue;
+    }
+    --num;
+    _logger->debug("Creating ut_metadata request index=%lu",
+		   static_cast<unsigned long>(index));
+    SharedHandle<UTMetadataRequestExtensionMessage> m
+      (new UTMetadataRequestExtensionMessage
+       (_peer->getExtensionMessageID("ut_metadata")));
+    m->setIndex(index);
+    m->setDownloadContext(_dctx);
+    m->setBtMessageDispatcher(_dispatcher);
+    m->setBtMessageFactory(_messageFactory);
+    m->setPeer(_peer);
+    
+    SharedHandle<BtMessage> msg = _messageFactory->createBtExtendedMessage(m);
+    msgs.push_back(msg);
+    _tracker->add(index);
+  }
+}
+
+} // namespace aria2