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/***************************************************************************
* Copyright (C) 2005 by Joris Guisson *
* [email protected] *
* *
* 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. *
***************************************************************************/
#ifndef BTCACHE_H
#define BTCACHE_H
#include <kio/job.h>
class QStringList;
namespace bt
{
class Torrent;
class TorrentFile;
class Chunk;
class PreallocationThread;
/**
* @author Joris Guisson
* @brief Manages the temporary data
*
* Interface for a class which manages downloaded data.
* Subclasses should implement the load and save methods.
*/
class Cache
{
protected:
Torrent & tor;
QString tmpdir;
QString datadir;
bool preexisting_files;
Uint32 mmap_failures;
public:
Cache(Torrent & tor,const QString & tmpdir,const QString & datadir);
virtual ~Cache();
/// Get the datadir
QString getDataDir() const {return datadir;}
/**
* Get the actual output path.
* @return The output path
*/
virtual QString getOutputPath() const = 0;
/**
* Changes the tmp dir. All data files should already been moved.
* This just modifies the tmpdir variable.
* @param ndir The new tmpdir
*/
virtual void changeTmpDir(const QString & ndir);
/**
* Move the data files to a new directory.
* @param ndir The directory
* @return The KIO::Job doing the move
*/
virtual KIO::Job* moveDataFiles(const QString & ndir) = 0;
/**
* The move data files job is done.
* @param job The job that did it
*/
virtual void moveDataFilesCompleted(KIO::Job* job) = 0;
/**
* Changes output path. All data files should already been moved.
* This just modifies the datadir variable.
* @param outputpath New output path
*/
virtual void changeOutputPath(const QString & outputpath) = 0;
/**
* Load a chunk into memory. If something goes wrong,
* an Error should be thrown.
* @param c The Chunk
*/
virtual void load(Chunk* c) = 0;
/**
* Save a chunk to disk. If something goes wrong,
* an Error should be thrown.
* @param c The Chunk
*/
virtual void save(Chunk* c) = 0;
/**
* Prepare a chunk for downloading.
* @param c The Chunk
* @return true if ok, false otherwise
*/
virtual bool prep(Chunk* c) = 0;
/**
* Create all the data files to store the data.
*/
virtual void create() = 0;
/**
* Close the cache file(s).
*/
virtual void close() = 0;
/**
* Open the cache file(s)
*/
virtual void open() = 0;
/// Does nothing, can be overridden to be alerted of download status changes of a TorrentFile
virtual void downloadStatusChanged(TorrentFile*, bool) {};
/**
* Preallocate diskspace for all files
* @param prealloc The thread doing the preallocation
*/
virtual void preallocateDiskSpace(PreallocationThread* prealloc) = 0;
/// See if the download has existing files
bool hasExistingFiles() const {return preexisting_files;}
/**
* Test all files and see if they are not missing.
* If so put them in a list
*/
virtual bool hasMissingFiles(QStringList & sl) = 0;
/**
* Delete all data files, in case of multi file torrents
* empty directories should also be deleted.
*/
virtual void deleteDataFiles() = 0;
/**
* See if we are allowed to use mmap, when loading chunks.
* This will return false if we are close to system limits.
*/
static bool mappedModeAllowed();
/**
* Get the number of bytes all the files of this torrent are currently using on disk.
* */
virtual Uint64 diskUsage() = 0;
};
}
#endif
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