PermutationGenerator (OpenAM Project 16.0.0-SNAPSHOT API)

java.lang.Object
- com.iplanet.dpro.session.service.PermutationGenerator

```
public class PermutationGenerator
extends Object
```
Utility class to generate uniformly distributed random permutations of integers in the range 0..size Permutation generation deterministically produces the same result if given the same seed value This class is used to implement enhanced request routing scheme as described in http://is.red.iplanet.com/failover/s1as7/IS62-SessionFailover.sxw

Constructor Summary

Constructors
Constructor	Description
`PermutationGenerator(long seed, int size)`	Constructs`PermutationGenerator`
`PermutationGenerator(String seed, int size)`	Constructor

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`short`	`itemAt(int pos)`	Returns permutation element at a given position Throws
`static void`	`main(String[] args)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - PermutationGenerator
```
public PermutationGenerator(String seed,
                            int size)
```
    Constructor
    
    Parameters:
    
    seed - seed used by RNG
    
    size - permutation size
  - PermutationGenerator
```
public PermutationGenerator(long seed,
                            int size)
```
    ConstructsPermutationGenerator
    
    Parameters:
    
    seed - seed used by RNG
    
    size - permutation size
- Method Detail
  - itemAt
```
public short itemAt(int pos)
```
    Returns permutation element at a given position Throws
    
    Parameters:
    
    pos - permutation element position
    
    Returns:
    
    permutation element value
    
    Throws:
    
    IndexOutOfBoundsException - if index is less than 0 or greater than permutation size specified in constructor
  - main
```
public static void main(String[] args)
                 throws Exception
```
    Throws:
    
    Exception