bttorrent.java

p2p仿真

/*
 * @(#)BTTorrent.java	ver 1.2  6/20/2005
 *
 * Copyright 2005 Weishuai Yang ([e-mail]). 
 * All rights reserved.
 * 
 */

package gps.protocol.BT.param;
import gps.protocol.BT.BTDocument;
import gps.protocol.BT.BTTracker;

/**
 * Torrent class includes informations in the .torrent file.
 * 
 * Torrent metainfo file includes the following keys:
 * 
 * announce: the URL of the tracker
 * name: file name
 * piece length: block size
 * pieces: hash of each piece
 * length: file size
 * path: file path
 *
 * In our simulation, only relavent information is included
 * 
 * Note: hash of each piece is only for verification purpose!
 * The torrent file and the corresponding document is indexed 
 * by the docHashKey
 * 
 * @author  Weishuai Yang
 * @version 1.2,  6/20/2005
 */
  
public class BTTorrent {

    /**
     * reference to tracker where this torrent is stored at
     */
	public BTTracker mTracker=null;
	/**
	 * doc hash key
	 */
	public String mDocHashKey=null;
	/**
	 * document length
	 */
	public double mLength=0;
	/**
	 * piece length
	 */
	public double mPieceLength=0;
	/**
	 * total piece number 
	 */
	public int mPieceNum=0;
	/**
	 * document popularity
	 */
	public int mPopularity=0;
	
	/**
	 * constructs a BTTorrent object
	 * @param doc the document related to the torrent
	 * @param t tracker
	 */
	public BTTorrent(BTDocument doc, BTTracker t){
		mTracker=t;
		mDocHashKey=doc.getKey();
		mLength=doc.getSize();
		mPieceLength=doc.getPieceLength();
		mPieceNum=doc.getPieceNum();
		mPopularity=doc.getPopularity();
		
	}
	
}