130 lines
3.9 KiB
C++
130 lines
3.9 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) 2012 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 "WrDiskCache.h"
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#include <cassert>
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#include "WrDiskCacheEntry.h"
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#include "LogFactory.h"
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#include "fmt.h"
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namespace aria2 {
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WrDiskCache::WrDiskCache(size_t limit) : limit_(limit), total_(0), clock_(0) {}
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WrDiskCache::~WrDiskCache()
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{
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if (total_) {
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A2_LOG_WARN(fmt("Write disk cache is not empty size=%lu",
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static_cast<unsigned long>(total_)));
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}
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}
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bool WrDiskCache::add(WrDiskCacheEntry* ent)
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{
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ent->setSizeKey(ent->getSize());
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ent->setLastUpdate(++clock_);
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std::pair<EntrySet::iterator, bool> rv = set_.insert(ent);
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if (rv.second) {
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total_ += ent->getSize();
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ensureLimit();
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return true;
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}
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else {
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A2_LOG_WARN(fmt("Found duplicate cache entry a.{size=%lu,clock=%" PRId64
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"} b{size=%lu,clock=%" PRId64 "}",
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static_cast<unsigned long>((*rv.first)->getSize()),
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(*rv.first)->getLastUpdate(),
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static_cast<unsigned long>(ent->getSize()),
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ent->getLastUpdate()));
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return false;
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}
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}
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bool WrDiskCache::remove(WrDiskCacheEntry* ent)
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{
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if (set_.erase(ent)) {
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A2_LOG_DEBUG(fmt("Removed cache entry size=%lu, clock=%" PRId64,
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static_cast<unsigned long>(ent->getSize()),
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ent->getLastUpdate()));
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total_ -= ent->getSize();
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return true;
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}
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else {
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return false;
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}
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}
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bool WrDiskCache::update(WrDiskCacheEntry* ent, ssize_t delta)
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{
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if (!set_.erase(ent)) {
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return false;
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}
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A2_LOG_DEBUG(fmt("Update cache entry size=%lu, delta=%ld, clock=%" PRId64,
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static_cast<unsigned long>(ent->getSize()),
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static_cast<long>(delta), ent->getLastUpdate()));
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ent->setSizeKey(ent->getSize());
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ent->setLastUpdate(++clock_);
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set_.insert(ent);
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if (delta < 0) {
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assert(total_ >= static_cast<size_t>(-delta));
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}
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total_ += delta;
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ensureLimit();
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return true;
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}
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void WrDiskCache::ensureLimit()
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{
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while (total_ > limit_) {
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auto i = set_.begin();
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WrDiskCacheEntry* ent = *i;
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A2_LOG_DEBUG(fmt("Force flush cache entry size=%lu, clock=%" PRId64,
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static_cast<unsigned long>(ent->getSizeKey()),
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ent->getLastUpdate()));
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total_ -= ent->getSize();
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ent->writeToDisk();
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set_.erase(i);
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ent->setSizeKey(ent->getSize());
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ent->setLastUpdate(++clock_);
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set_.insert(ent);
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}
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}
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} // namespace aria2
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