/*
* Created on Apr 5, 2005
* Created by Alon Rohter
* Copyright (C) 2005, 2006 Aelitis, All Rights Reserved.
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* AELITIS, SAS au capital de 46,603.30 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*
*/
package com.aelitis.azureus.core.peermanager.uploadslots;
import java.util.*;
import org.gudy.azureus2.core3.disk.DiskManager;
import org.gudy.azureus2.core3.peer.PEPeer;
import com.aelitis.azureus.core.peermanager.unchoker.UnchokerUtil;
/**
* Unchoker implementation to be used while in downloading mode.
*/
public class DownloadingRanker {
public DownloadingRanker() {
/* nothing */
}
public PEPeer getNextOptimisticPeer( ArrayList<PEPeer> all_peers ) {
return UnchokerUtil.getNextOptimisticPeer( all_peers, true, true ); //TODO extract and optimize?
}
public ArrayList<PEPeer> rankPeers( int max_to_unchoke, ArrayList<PEPeer> all_peers ) {
ArrayList<PEPeer> best_peers = new ArrayList<PEPeer>();
long[] bests = new long[ max_to_unchoke ]; //ensure we never rank more peers than needed
//fill slots with peers who we are currently downloading the fastest from
for( int i=0; i < all_peers.size(); i++ ) {
PEPeer peer = all_peers.get( i );
if( peer.isInteresting() && UnchokerUtil.isUnchokable( peer, false ) ) { //viable peer found
long rate = peer.getStats().getSmoothDataReceiveRate();
if( rate > 256 ) { //filter out really slow peers
UnchokerUtil.updateLargestValueFirstSort( rate, bests, peer, best_peers, 0 );
}
}
}
//if we havent yet picked enough slots
if( best_peers.size() < max_to_unchoke ) {
int start_pos = best_peers.size();
//fill the remaining slots with peers that we have downloaded from in the past
for( int i=0; i < all_peers.size(); i++ ) {
PEPeer peer = all_peers.get( i );
if( peer.isInteresting() && UnchokerUtil.isUnchokable( peer, false ) && !best_peers.contains( peer ) ) { //viable peer found
long uploaded_ratio = peer.getStats().getTotalDataBytesSent() / (peer.getStats().getTotalDataBytesReceived() + (DiskManager.BLOCK_SIZE-1));
//make sure we haven't already uploaded several times as much data as they've sent us
if( uploaded_ratio <3) {
UnchokerUtil.updateLargestValueFirstSort( peer.getStats().getTotalDataBytesReceived(), bests, peer, best_peers, start_pos );
}
}
}
}
return best_peers;
}
}