org.apache.sysds.runtime.controlprogram.parfor.util

Class IDHandler

java.lang.Object

org.apache.sysds.runtime.controlprogram.parfor.util.IDHandler

public class IDHandler
extends Object

Functionalities for extracting numeric IDs from Hadoop taskIDs and other things related to modification of IDs. NOTE: Many those functionalities rely on a big endian format. This is always given because Java stores everything as big endian, independent of the platform. Furthermore, we rely on Long.MAX_VALUE in order to prevent numeric overflows with regard to signed data types.

Constructor Summary

Constructors

Constructor and Description
IDHandler()

Method Summary

Modifier and Type	Method and Description
static long	concatIntIDsToLong(int part1, int part2)
static String	createDistributedUniqueID() Creates a unique identifier with the pattern <process_id>_<host_ip>.
static int	extractIntID(String taskID)
static int	extractIntIDFromLong(long val, int part) Extract int ID from long value

Methods inherited from class java.lang.Object

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

Constructor Detail

IDHandler

public IDHandler()

Method Detail

extractIntID

public static int extractIntID(String taskID)

concatIntIDsToLong

public static long concatIntIDsToLong(int part1,
                                      int part2)

extractIntIDFromLong

public static int extractIntIDFromLong(long val,
                                       int part)

Extract int ID from long value

Parameters:

val - long value

part - if part is 1, use first 4 bytes. if part is 2, use second 4 bytes!

Returns:

return int id, or -1 if part is not 1 or 2!

createDistributedUniqueID

public static String createDistributedUniqueID()

Creates a unique identifier with the pattern <process_id>_<host_ip>.

Returns:

distributed unique id