IDHandler (Apache SystemDS 3.1.0 API)

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 Description

IDHandler()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	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
`static String`	`obtainProcessID()`

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
  - obtainProcessID
```
public static String obtainProcessID()
```