PartialStaticDataDistribution (Dataflow Library Distribution Project 8.2.0-176 API)

java.lang.Object
- com.pervasive.datarush.ports.record.DataDistribution
- - com.pervasive.datarush.ports.record.PartialDataDistribution
  - - com.pervasive.datarush.ports.record.PartialStaticDataDistribution

Direct Known Subclasses:

BalancedDistribution, KeyDrivenDataDistribution, UnspecifiedPartialDistribution
```
public abstract class PartialStaticDataDistribution
extends PartialDataDistribution
```
Base class for all distributions whose partitioning parameters are specified statically.

See Also:

DataDistribution

Constructor Summary

Constructors
Modifier Constructor Description

protected PartialStaticDataDistribution()
Default constructor.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`protected abstract PartitioningFunction`	`getPartitioningFunction()`	Subclasses must override this method to provide the partitioning function to be used
`protected abstract boolean`	`requiresRepartitionFrom(PartialDataDistribution source)`	Subclasses must override this method to declare whether a repartition is required given the source distribution.
`protected boolean`	`supportsLocalRepartition()`	Subclasses may override to indicate that they support a local repartition

Methods inherited from class com.pervasive.datarush.ports.record.PartialDataDistribution
getGatherScheme

Methods inherited from class com.pervasive.datarush.ports.record.DataDistribution
getAliases, remap, toString

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

- Constructor Detail
  - PartialStaticDataDistribution
```
protected PartialStaticDataDistribution()
```
    Default constructor.
- Method Detail
  - supportsLocalRepartition
```
protected boolean supportsLocalRepartition()
```
    Subclasses may override to indicate that they support a local repartition
    
    Returns:
  - getPartitioningFunction
```
protected abstract PartitioningFunction getPartitioningFunction()
```
    Subclasses must override this method to provide the partitioning function to be used
    
    Returns:
    
    a partition function
  - requiresRepartitionFrom
```
protected abstract boolean requiresRepartitionFrom(PartialDataDistribution source)
```
    Subclasses must override this method to declare whether a repartition is required given the source distribution. Implementations may err on the side of caution by always returning true but this may have an impact on performance.
    
    Parameters:
    
    source - the source distribution
    
    Returns:
    
    true if a repartition is required, false if this data distribution matches what was specified.