mirror of https://github.com/aria2/aria2
150 lines
3.7 KiB
C++
150 lines
3.7 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_ENTRY_H
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#define D_WR_DISK_CACHE_ENTRY_H
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#include "common.h"
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#include <set>
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#include "SharedHandle.h"
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#include "a2functional.h"
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#include "error_code.h"
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namespace aria2 {
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class DiskAdaptor;
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class WrDiskCache;
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class WrDiskCacheEntry {
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public:
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struct DataCell {
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// Where the data is going to be put in DiskAdaptor
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int64_t goff;
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// data must be len+offset bytes. Thus, the cached data is
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// [data+offset, data+offset+len).
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unsigned char *data;
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size_t offset;
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size_t len;
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// valid memory range from data+offset
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size_t capacity;
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bool operator<(const DataCell& rhs) const
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{
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return goff < rhs.goff;
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}
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};
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typedef std::set<DataCell*, DerefLess<DataCell*> > DataCellSet;
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WrDiskCacheEntry(const SharedHandle<DiskAdaptor>& diskAdaptor);
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~WrDiskCacheEntry();
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// Flushes the cached data to the disk and deletes them.
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void writeToDisk();
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// Deletes cached data without flushing to the disk.
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void clear();
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// Caches |dataCell|
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bool cacheData(DataCell* dataCell);
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// Appends into last dataCell in set_ if the region is
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// contagious. Returns the number of copied bytes.
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size_t append(int64_t goff, const unsigned char *data, size_t len);
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size_t getSize() const
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{
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return size_;
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}
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void setSizeKey(size_t sizeKey)
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{
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sizeKey_ = sizeKey;
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}
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size_t getSizeKey() const
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{
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return sizeKey_;
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}
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void setLastUpdate(int64_t clock)
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{
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lastUpdate_ = clock;
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}
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int64_t getLastUpdate() const
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{
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return lastUpdate_;
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}
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bool operator<(const WrDiskCacheEntry& rhs) const
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{
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return sizeKey_ > rhs.sizeKey_ ||
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(sizeKey_ == rhs.sizeKey_ && lastUpdate_ < rhs.lastUpdate_);
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}
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enum {
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CACHE_ERR_SUCCESS,
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CACHE_ERR_ERROR
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};
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int getError() const
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{
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return error_;
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}
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error_code::Value getErrorCode() const
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{
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return errorCode_;
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}
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const DataCellSet& getDataSet() const
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{
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return set_;
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}
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private:
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void deleteDataCells();
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size_t sizeKey_;
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int64_t lastUpdate_;
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size_t size_;
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DataCellSet set_;
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int error_;
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error_code::Value errorCode_;
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SharedHandle<DiskAdaptor> diskAdaptor_;
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};
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} // namespace aria2
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#endif // D_WR_DISK_CACHE_ENTRY_H
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