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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2012 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 --> */
#ifndef D_WR_DISK_CACHE_ENTRY_H
#define D_WR_DISK_CACHE_ENTRY_H
#include "common.h"
#include <set>
#include <memory>
#include "a2functional.h"
#include "error_code.h"
namespace aria2 {
class DiskAdaptor;
class WrDiskCache;
class WrDiskCacheEntry {
public:
struct DataCell {
// Where the data is going to be put in DiskAdaptor
int64_t goff;
// data must be len+offset bytes. Thus, the cached data is
// [data+offset, data+offset+len).
unsigned char *data;
size_t offset;
size_t len;
// valid memory range from data+offset
size_t capacity;
bool operator<(const DataCell& rhs) const
{
return goff < rhs.goff;
}
};
typedef std::set<DataCell*, DerefLess<DataCell*> > DataCellSet;
WrDiskCacheEntry(const std::shared_ptr<DiskAdaptor>& diskAdaptor);
~WrDiskCacheEntry();
// Flushes the cached data to the disk and deletes them.
void writeToDisk();
// Deletes cached data without flushing to the disk.
void clear();
// Caches |dataCell|
bool cacheData(DataCell* dataCell);
// Appends into last dataCell in set_ if the region is
// contagious. Returns the number of copied bytes.
size_t append(int64_t goff, const unsigned char *data, size_t len);
size_t getSize() const
{
return size_;
}
void setSizeKey(size_t sizeKey)
{
sizeKey_ = sizeKey;
}
size_t getSizeKey() const
{
return sizeKey_;
}
void setLastUpdate(int64_t clock)
{
lastUpdate_ = clock;
}
int64_t getLastUpdate() const
{
return lastUpdate_;
}
bool operator<(const WrDiskCacheEntry& rhs) const
{
return sizeKey_ > rhs.sizeKey_ ||
(sizeKey_ == rhs.sizeKey_ && lastUpdate_ < rhs.lastUpdate_);
}
enum {
CACHE_ERR_SUCCESS,
CACHE_ERR_ERROR
};
int getError() const
{
return error_;
}
error_code::Value getErrorCode() const
{
return errorCode_;
}
const DataCellSet& getDataSet() const
{
return set_;
}
private:
void deleteDataCells();
size_t sizeKey_;
int64_t lastUpdate_;
size_t size_;
DataCellSet set_;
int error_;
error_code::Value errorCode_;
std::shared_ptr<DiskAdaptor> diskAdaptor_;
};
} // namespace aria2
#endif // D_WR_DISK_CACHE_ENTRY_H
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