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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 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_DISK_ADAPTOR_H
#define D_DISK_ADAPTOR_H
#include "BinaryStream.h"
#include <string>
#include <vector>
#include <memory>
#include "TimeA2.h"
namespace aria2 {
class FileEntry;
class FileAllocationIterator;
class WrDiskCacheEntry;
class OpenedFileCounter;
class DiskAdaptor:public BinaryStream {
public:
enum FileAllocationMethod {
FILE_ALLOC_ADAPTIVE,
FILE_ALLOC_FALLOC,
FILE_ALLOC_TRUNC
};
DiskAdaptor();
virtual ~DiskAdaptor();
virtual void openFile() = 0;
virtual void closeFile() = 0;
virtual void openExistingFile() = 0;
virtual void initAndOpenFile() = 0;
virtual bool fileExists() = 0;
virtual int64_t size() = 0;
template<typename InputIterator>
void setFileEntries(InputIterator first, InputIterator last)
{
fileEntries_.assign(first, last);
}
const std::vector<std::shared_ptr<FileEntry>>& getFileEntries() const
{
return fileEntries_;
}
virtual std::unique_ptr<FileAllocationIterator> fileAllocationIterator() = 0;
virtual void enableReadOnly() {}
virtual void disableReadOnly() {}
virtual bool isReadOnlyEnabled() const { return false; }
// Enables mmap feature. Some derived classes may require that files
// have been opened before this method call.
virtual void enableMmap() {}
// Assumed each file length is stored in fileEntries or DiskAdaptor knows it.
// If each actual file's length is larger than that, truncate file to that
// length.
// Call one of openFile/openExistingFile/initAndOpenFile before calling this
// function.
virtual void cutTrailingGarbage() = 0;
// Returns the number of files, the actime and modtime of which are
// successfully changed.
virtual size_t utime(const Time& actime, const Time& modtime) = 0;
// Just like readData(), but drop cache after read.
virtual ssize_t readDataDropCache(unsigned char* data, size_t len,
int64_t offset) = 0;
// Writes cached data to the underlying disk.
virtual void writeCache(const WrDiskCacheEntry* entry) = 0;
void setFileAllocationMethod(FileAllocationMethod method)
{
fileAllocationMethod_ = method;
}
int getFileAllocationMethod() const
{
return fileAllocationMethod_;
}
// Closes at most |numClose| files if possible. This method is used to
// ensure that global number of open file stays under certain limit.
// Returns the number of closed files.
virtual size_t tryCloseFile(size_t numClose) { return 0; }
void setOpenedFileCounter
(std::shared_ptr<OpenedFileCounter> openedFileCounter)
{
openedFileCounter_ = std::move(openedFileCounter);
}
const std::shared_ptr<OpenedFileCounter>& getOpenedFileCounter() const
{
return openedFileCounter_;
}
private:
std::vector<std::shared_ptr<FileEntry> > fileEntries_;
FileAllocationMethod fileAllocationMethod_;
std::shared_ptr<OpenedFileCounter> openedFileCounter_;
};
} // namespace aria2
#endif // D_DISK_ADAPTOR_H
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