Package org.apache.hadoop.io.erasurecode.coder.util

Class HHUtil

java.lang.Object

org.apache.hadoop.io.erasurecode.coder.util.HHUtil

@Private
public final class HHUtil
extends java.lang.Object

Some utilities for Hitchhiker coding.

Method Summary

Modifier and Type	Method	Description
static java.nio.ByteBuffer	allocateByteBuffer(boolean useDirectBuffer, int bufSize)
static <T> T	findFirstValidInput(T[] inputs)	Find the valid input from all the inputs.
static java.nio.ByteBuffer	getPiggyBackForDecode(java.nio.ByteBuffer[][] inputs, java.nio.ByteBuffer[][] outputs, int pbParityIndex, int numDataUnits, int numParityUnits, int pbIndex)
static java.nio.ByteBuffer[]	getPiggyBacksFromInput(java.nio.ByteBuffer[] inputs, int[] piggyBackIndex, int numParityUnits, int pgIndex, RawErasureEncoder encoder)
static int[]	initPiggyBackFullIndexVec(int numDataUnits, int[] piggyBackIndex)
static int[]	initPiggyBackIndexWithoutPBVec(int numDataUnits, int numParityUnits)

Methods inherited from class java.lang.Object

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

Method Detail

initPiggyBackIndexWithoutPBVec

public static int[] initPiggyBackIndexWithoutPBVec(int numDataUnits,
                                                   int numParityUnits)

initPiggyBackFullIndexVec

public static int[] initPiggyBackFullIndexVec(int numDataUnits,
                                              int[] piggyBackIndex)

getPiggyBacksFromInput

public static java.nio.ByteBuffer[] getPiggyBacksFromInput(java.nio.ByteBuffer[] inputs,
                                                           int[] piggyBackIndex,
                                                           int numParityUnits,
                                                           int pgIndex,
                                                           RawErasureEncoder encoder)
                                                    throws java.io.IOException

Throws:

java.io.IOException

allocateByteBuffer

public static java.nio.ByteBuffer allocateByteBuffer(boolean useDirectBuffer,
                                                     int bufSize)

getPiggyBackForDecode

public static java.nio.ByteBuffer getPiggyBackForDecode(java.nio.ByteBuffer[][] inputs,
                                                        java.nio.ByteBuffer[][] outputs,
                                                        int pbParityIndex,
                                                        int numDataUnits,
                                                        int numParityUnits,
                                                        int pbIndex)

findFirstValidInput

public static <T> T findFirstValidInput(T[] inputs)

Find the valid input from all the inputs.

Type Parameters:

T - Generics Type T.

Parameters:

inputs - input buffers to look for valid input

Returns:

the first valid input