mirror of https://github.com/aria2/aria2
80 lines
2.7 KiB
C++
80 lines
2.7 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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#ifndef D_WR_DISK_CACHE_H
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#define D_WR_DISK_CACHE_H
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#include "common.h"
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#include <set>
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#include "a2functional.h"
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namespace aria2 {
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class WrDiskCacheEntry;
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class WrDiskCache {
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public:
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WrDiskCache(size_t limit);
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~WrDiskCache();
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// Adds the cache entry |ent| to the storage. The size of cached
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// data of ent is added to total_.
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bool add(WrDiskCacheEntry* ent);
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// Removes the cache entry |ent| from the stroage. The size of
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// cached data of ent is subtracted from total_.
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bool remove(WrDiskCacheEntry* ent);
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// Updates the already added entry |ent|. The |delta| means how many
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// bytes is increased in this update. If the size is reduced, use
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// negative value.
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bool update(WrDiskCacheEntry* ent, ssize_t delta);
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// Evicts entries from storage so that total size of cache is kept
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// under the limit.
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void ensureLimit();
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size_t getSize() const { return total_; }
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private:
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typedef std::set<WrDiskCacheEntry*, DerefLess<WrDiskCacheEntry*>> EntrySet;
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// Maximum number of bytes the storage can cache.
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size_t limit_;
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// Current number of bytes cached.
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size_t total_;
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EntrySet set_;
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int64_t clock_;
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};
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} // namespace aria2
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#endif // D_WR_DISK_CACHE_H
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