rice.p2p.glacier
Class ErasureCodec

java.lang.Object
  rice.p2p.glacier.ErasureCodec

public class ErasureCodec

extends java.lang.Object

DESCRIBE THE CLASS

Version:

$Id: ErasureCodec.java 3274 2006-05-15 16:17:47Z jeffh $

Author:

ahae

Field Summary

protected Environment	environment DESCRIBE THE FIELD
protected Logger	logger DESCRIBE THE FIELD
protected int	numFragments DESCRIBE THE FIELD
protected int	numSurvivors DESCRIBE THE FIELD

Constructor Summary

ErasureCodec(int _numFragments, int _numSurvivors, Environment env)
Constructor for ErasureCodec.

Method Summary

PastContent	decode(Fragment[] frag, Endpoint endpoint, PastContentDeserializer pcd) DESCRIBE THE METHOD
protected void	decodeChunk(int[] buffer, int nExtra, int[] RowInd, boolean[] haveFragment, long[][] InvMat, int[] ColInd) DESCRIBE THE METHOD
protected PastContent	deserialize(byte[] bytes, Endpoint endpoint, PastContentDeserializer pcd) DESCRIBE THE METHOD
void	dump(byte[] data) DESCRIBE THE METHOD
Fragment[]	encode(byte[] bytes, int length, boolean[] generateFragment) Generates multiple fragments from the incoming bytes
protected void	encodeChunk(int[] buffer) Input: buffer of size ; first words contain message, rest is zeroes Output: buffer contains fragments
Fragment[]	encodeObject(PastContent obj, boolean[] generateFragment) DESCRIBE THE METHOD
Fragment[]	encodeObject(RawPastContent obj, boolean[] generateFragment) Serializes the object.
protected void	initElt() DESCRIBE THE METHOD

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

numFragments

protected int numFragments

DESCRIBE THE FIELD

numSurvivors

protected int numSurvivors

DESCRIBE THE FIELD

environment

protected Environment environment

DESCRIBE THE FIELD

logger

protected Logger logger

DESCRIBE THE FIELD

Constructor Detail

ErasureCodec

public ErasureCodec(int _numFragments,
                    int _numSurvivors,
                    Environment env)

Constructor for ErasureCodec.

Parameters:

_numFragments - DESCRIBE THE PARAMETER

_numSurvivors - DESCRIBE THE PARAMETER

env - DESCRIBE THE PARAMETER

Method Detail

dump

public void dump(byte[] data)

DESCRIBE THE METHOD

Parameters:

data - DESCRIBE THE PARAMETER

encodeObject

public Fragment[] encodeObject(PastContent obj,
                               boolean[] generateFragment)

DESCRIBE THE METHOD

Parameters:

obj - DESCRIBE THE PARAMETER

generateFragment - DESCRIBE THE PARAMETER

Returns:

DESCRIBE THE RETURN VALUE

encodeObject

public Fragment[] encodeObject(RawPastContent obj,
                               boolean[] generateFragment)

Serializes the object.

Parameters:

obj -

generateFragment -

Returns:

encodeChunk

protected void encodeChunk(int[] buffer)

Input: buffer of size ; first words contain message, rest is zeroes Output: buffer contains fragments

Parameters:

buffer - DESCRIBE THE PARAMETER

encode

public Fragment[] encode(byte[] bytes,
                         int length,
                         boolean[] generateFragment)

Generates multiple fragments from the incoming bytes

Parameters:

bytes -

length -

generateFragment -

Returns:

decodeChunk

protected void decodeChunk(int[] buffer,
                           int nExtra,
                           int[] RowInd,
                           boolean[] haveFragment,
                           long[][] InvMat,
                           int[] ColInd)

DESCRIBE THE METHOD

Parameters:

buffer - DESCRIBE THE PARAMETER

nExtra - DESCRIBE THE PARAMETER

RowInd - DESCRIBE THE PARAMETER

haveFragment - DESCRIBE THE PARAMETER

InvMat - DESCRIBE THE PARAMETER

ColInd - DESCRIBE THE PARAMETER

decode

public PastContent decode(Fragment[] frag,
                          Endpoint endpoint,
                          PastContentDeserializer pcd)

DESCRIBE THE METHOD

Parameters:

frag - DESCRIBE THE PARAMETER

endpoint - DESCRIBE THE PARAMETER

pcd - DESCRIBE THE PARAMETER

Returns:

DESCRIBE THE RETURN VALUE

deserialize

protected PastContent deserialize(byte[] bytes,
                                  Endpoint endpoint,
                                  PastContentDeserializer pcd)
                           throws java.io.IOException,
                                  java.lang.ClassNotFoundException

DESCRIBE THE METHOD

Parameters:

bytes - DESCRIBE THE PARAMETER

endpoint - DESCRIBE THE PARAMETER

pcd - DESCRIBE THE PARAMETER

Returns:

DESCRIBE THE RETURN VALUE

Throws:

java.io.IOException - DESCRIBE THE EXCEPTION

java.lang.ClassNotFoundException - DESCRIBE THE EXCEPTION

initElt

protected void initElt()

DESCRIBE THE METHOD