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diff --git a/src/OpenedFileCounter.cc b/src/OpenedFileCounter.cc
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+++ b/src/OpenedFileCounter.cc
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+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2014 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 "OpenedFileCounter.h"
+
+#include <cassert>
+
+#include "RequestGroupMan.h"
+#include "RequestGroup.h"
+#include "PieceStorage.h"
+#include "DiskAdaptor.h"
+#include "SimpleRandomizer.h"
+
+namespace aria2 {
+
+OpenedFileCounter::OpenedFileCounter(RequestGroupMan* rgman,
+                                     size_t maxOpenFiles)
+  : rgman_(rgman),
+    maxOpenFiles_(maxOpenFiles),
+    numOpenFiles_(0)
+{}
+
+void OpenedFileCounter::ensureMaxOpenFileLimit(size_t numNewFiles)
+{
+  if(!rgman_) {
+    return;
+  }
+
+  if(numOpenFiles_ + numNewFiles <= maxOpenFiles_) {
+    numOpenFiles_ += numNewFiles;
+    return;
+  }
+  assert(numNewFiles <= maxOpenFiles_);
+  size_t numClose = numOpenFiles_ + numNewFiles - maxOpenFiles_;
+  size_t left = numClose;
+
+  auto requestGroups = rgman_->getRequestGroups();
+
+  auto mark = std::begin(requestGroups);
+  std::advance(mark,
+               SimpleRandomizer::getInstance()->
+               getRandomNumber(requestGroups.size()));
+  for(auto i = mark; i != std::end(requestGroups) && left > 0; ++i) {
+    left -= (*i)->getPieceStorage()->getDiskAdaptor()->tryCloseFile(left);
+  }
+  for(auto i = std::begin(requestGroups); i != mark && left > 0; ++i) {
+    left -= (*i)->getPieceStorage()->getDiskAdaptor()->tryCloseFile(left);
+  }
+  assert(left == 0);
+  numOpenFiles_ += numNewFiles - numClose;
+}
+
+void OpenedFileCounter::reduceNumOfOpenedFile(size_t numCloseFiles)
+{
+  if(!rgman_) {
+    return;
+  }
+
+  assert(numOpenFiles_ >= numCloseFiles);
+  numOpenFiles_ -= numCloseFiles;
+}
+
+void OpenedFileCounter::deactivate()
+{
+  rgman_ = nullptr;
+}
+
+} // namespace aria2
+