gps.protocol.BT.algorithm
Class BTAlgorithmReChoking

java.lang.Object
  gps.protocol.BT.algorithm.BTAlgorithmReChoking

All Implemented Interfaces:

SimEventHandler

public class BTAlgorithmReChoking
extends java.lang.Object
implements SimEventHandler

BT Rechoking algorithm. Choking is based on session rather than node. i.e. it considers only connections for that file Choking algorithm should meet several criteria: It should cap the number of simultaneous uploads for good TCP performance. It should avoid choking and unchoking quickly, known as 'fibrillation' It should reciprocate to peers who let it download. It should try out unused connections once in a while to find out a better one, i.e. optimistic unchoking.

Version:

1.2, 6/20/2005

Author:

Weishuai Yang

Field Summary

static int	DEFAULT_RECHOKING_INTERVAL default rechoking interval
static int	DEFAULT_UNCHOKE_NUMBER default peer number that each session can unchoke

Constructor Summary

BTAlgorithmReChoking(BTSession session)
constructs rechoking object

BTAlgorithmReChoking(BTSession session, int n, int i)
chonstructs rechoking object with unchoke number and unchoke interveral set

Method Summary

int	getUnchokeNum() gets unchoke num set for this simulation
boolean	handle(SimEvent e) handles rechoking events
boolean	isRunning() check running status
void	nextSchedule() sets up next rechoking event
void	run() starts rechoking
java.lang.String	toString() gets string description

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

DEFAULT_UNCHOKE_NUMBER

public static final int DEFAULT_UNCHOKE_NUMBER

default peer number that each session can unchoke

See Also:

Constant Field Values

DEFAULT_RECHOKING_INTERVAL

public static final int DEFAULT_RECHOKING_INTERVAL

default rechoking interval

See Also:

Constant Field Values

Constructor Detail

BTAlgorithmReChoking

public BTAlgorithmReChoking(BTSession session)

constructs rechoking object

Parameters:

session - bt session this unchoking is working for

BTAlgorithmReChoking

public BTAlgorithmReChoking(BTSession session,
                            int n,
                            int i)

chonstructs rechoking object with unchoke number and unchoke interveral set

Parameters:

session - bt session this unchoking is working for

n - unchoke number

i - unchoke intervel

Method Detail

isRunning

public boolean isRunning()

check running status

Returns:

true if running

run

public void run()

starts rechoking

getUnchokeNum

public int getUnchokeNum()

gets unchoke num set for this simulation

Returns:

allowed unchok numer

handle

public boolean handle(SimEvent e)

handles rechoking events

Specified by:

handle in interface SimEventHandler

Parameters:

e - rechoking event

Returns:

true if already handled

nextSchedule

public void nextSchedule()

sets up next rechoking event

toString

public java.lang.String toString()

gets string description

Overrides:

toString in class java.lang.Object

Returns:

string description