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/***************************************************************************
* Copyright (C) 2005 by Joris Guisson *
* joris.guisson@gmail.com *
* *
* 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 BTPEERDOWNLOADER_H
#define BTPEERDOWNLOADER_H
#include <set>
#include <tqvaluelist.h>
#include <tqobject.h>
#include "globals.h"
#include "request.h"
namespace bt
{
class Peer;
class Request;
class Piece;
typedef std::set<Uint32> AllowedFastSet;
/**
* Request with a timestamp.
*/
struct TimeStampedRequest
{
Request req;
TimeStamp time_stamp;
TimeStampedRequest();
/**
* Constructor, set the request and calculate the timestamp.
* @param r The Request
*/
TimeStampedRequest(const Request & r);
/**
* Copy constructor, copy the request and the timestamp
* @param r The Request
*/
TimeStampedRequest(const TimeStampedRequest & t);
/**
* Equality operator, compares requests only.
* @param r The Request
* @return true if equal
*/
bool operator == (const Request & r);
/**
* Equality operator, compares requests only.
* @param r The Request
* @return true if equal
*/
bool operator == (const TimeStampedRequest & r);
/**
* Assignment operator.
* @param r The Request to copy
* @return *this
*/
TimeStampedRequest & operator = (const Request & r);
/**
* Assignment operator.
* @param r The TimeStampedRequest to copy
* @return *this
*/
TimeStampedRequest & operator = (const TimeStampedRequest & r);
};
/**
* @author Joris Guisson
* @brief Class which downloads pieces from a Peer
*
* This class downloads Piece's from a Peer.
*/
class PeerDownloader : public TQObject
{
Q_OBJECT
public:
/**
* Constructor, set the Peer
* @param peer The Peer
* @param chunk_size Size of a chunk in bytes
*/
PeerDownloader(Peer* peer,Uint32 chunk_size);
virtual ~PeerDownloader();
/// See if we can add a request to the wait_queue
bool canAddRequest() const;
/// Get the number of active requests
Uint32 getNumRequests() const;
/// Is the Peer choked.
bool isChoked() const;
/// Is NULL (is the Peer set)
bool isNull() const {return peer == 0;}
/**
* See if the Peer has a Chunk
* @param idx The Chunk's index
*/
bool hasChunk(Uint32 idx) const;
/// See if this PeerDownloader has nearly finished a chunk
bool isNearlyDone() const {return grabbed == 1 && nearly_done;}
/// Set the nearly done status of the PeerDownloader
void setNearlyDone(bool nd) {nearly_done = nd;}
/**
* Grab the Peer, indicates how many ChunkDownload's
* are using this PeerDownloader.
* @return The number of times this PeerDownloader was grabbed
*/
int grab();
/**
* When a ChunkDownload is ready with this PeerDownloader,
* it will release it, so that others can use it.
*/
void release();
/// Get the number of times this PeerDownloader was grabbed.
int getNumGrabbed() const {return grabbed;}
/// Get the Peer
const Peer* getPeer() const {return peer;}
/// Get the current download rate
Uint32 getDownloadRate() const;
/**
* Check for timed out requests.
*/
void checkTimeouts();
/// Get the maximum number of chunk downloads
Uint32 getMaxChunkDownloads() const;
/**
* The peer has been choked, all pending requests are rejected.
* (except for allowed fast ones)
*/
void choked();
public slots:
/**
* Send a Request. Note that the DownloadCap
* may not allow this. (In which case it will
* be stored temporarely in the unsent_reqs list)
* @param req The Request
*/
void download(const Request & req);
/**
* Cancel a Request.
* @param req The Request
*/
void cancel(const Request & req);
/**
* Cancel all Requests
*/
void cancelAll();
/**
* Handles a rejected request.
* @param req
*/
void onRejected(const Request & req);
private slots:
void piece(const Piece & p);
void peerDestroyed();
void update();
signals:
/**
* Emited when a Piece has been downloaded.
* @param p The Piece
*/
void downloaded(const Piece & p);
/**
* Emitted when a request takes longer then 60 seconds to download.
* The sender of the request will have to request it again. This does not apply for
* unsent requests. Their timestamps will be updated when they get transmitted.
* @param r The request
*/
void timedout(const Request & r);
/**
* A request was rejected.
* @param req The Request
*/
void rejected(const Request & req);
private:
Peer* peer;
TQValueList<TimeStampedRequest> reqs;
TQValueList<Request> wait_queue;
Uint32 max_wait_queue_size;
int grabbed;
Uint32 chunk_size;
bool nearly_done;
};
}
#endif
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