114 lines
3.3 KiB
C++
114 lines
3.3 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2014 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#include "OpenedFileCounter.h"
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#include <cassert>
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#include "RequestGroupMan.h"
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#include "RequestGroup.h"
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#include "PieceStorage.h"
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#include "DiskAdaptor.h"
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#include "SimpleRandomizer.h"
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namespace aria2 {
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OpenedFileCounter::OpenedFileCounter(RequestGroupMan* rgman,
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size_t maxOpenFiles)
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: rgman_(rgman), maxOpenFiles_(maxOpenFiles), numOpenFiles_(0)
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{
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}
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void OpenedFileCounter::ensureMaxOpenFileLimit(size_t numNewFiles)
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{
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if (!rgman_) {
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return;
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}
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if (numOpenFiles_ + numNewFiles <= maxOpenFiles_) {
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numOpenFiles_ += numNewFiles;
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return;
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}
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assert(numNewFiles <= maxOpenFiles_);
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size_t numClose = numOpenFiles_ + numNewFiles - maxOpenFiles_;
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size_t left = numClose;
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auto& requestGroups = rgman_->getRequestGroups();
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auto mark = std::begin(requestGroups);
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std::advance(mark, SimpleRandomizer::getInstance()->getRandomNumber(
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requestGroups.size()));
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auto closeFun = [&left](const std::shared_ptr<RequestGroup>& group) {
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auto& ps = group->getPieceStorage();
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if (!ps) {
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return;
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}
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auto diskAdaptor = ps->getDiskAdaptor();
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if (!diskAdaptor) {
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return;
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}
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left -= diskAdaptor->tryCloseFile(left);
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};
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for (auto i = mark; i != std::end(requestGroups) && left > 0; ++i) {
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closeFun(*i);
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}
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for (auto i = std::begin(requestGroups); i != mark && left > 0; ++i) {
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closeFun(*i);
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}
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assert(left == 0);
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numOpenFiles_ += numNewFiles - numClose;
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}
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void OpenedFileCounter::reduceNumOfOpenedFile(size_t numCloseFiles)
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{
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if (!rgman_) {
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return;
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}
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assert(numOpenFiles_ >= numCloseFiles);
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numOpenFiles_ -= numCloseFiles;
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}
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void OpenedFileCounter::deactivate() { rgman_ = nullptr; }
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} // namespace aria2
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