org.pentaho.aggdes.algorithm.impl

Class MonteCarloLatticeImpl

java.lang.Object

org.pentaho.aggdes.algorithm.impl.LatticeImpl

org.pentaho.aggdes.algorithm.impl.MonteCarloLatticeImpl

All Implemented Interfaces:

Lattice

public class MonteCarloLatticeImpl
extends LatticeImpl

Implementation of the Lattice data structure for use by the MonteCarloAlgorithm.

Field Summary

Fields inherited from class org.pentaho.aggdes.algorithm.impl.LatticeImpl

materializedAggregates, schema

Constructor Summary

Constructors

Constructor and Description
MonteCarloLatticeImpl(Schema schema)

Method Summary

Methods

Modifier and Type	Method and Description
AggregateImpl	chooseAggregate(double maxCost, double minCostBenefitRatio, Cost cost) Chooses the next un-materialized aggregate with the highest incremental benefit.
Lattice	copy() Returns a copy of this lattice.
Algorithm.CostBenefit	costBenefitOf(AggregateImpl aggregate) Returns an object representing the cost of the given aggregate, and benefit of adding it to the current lattice.
void	materialize(AggregateImpl aggregate) Materializes an aggregate.

Methods inherited from class org.pentaho.aggdes.algorithm.impl.LatticeImpl

computeAggregateCosts, computeAggregateCosts, estimateCost, findMaterializedDirectAscendants, findMaterializedDirectDescendants, findNearestMaterializedDescendant, getAggregate, getBenefit, getChildren, getMaterializedAggregates, getParents, nonMaterializedDescendants, toBits

Methods inherited from class java.lang.Object

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

Constructor Detail

MonteCarloLatticeImpl

public MonteCarloLatticeImpl(Schema schema)

Method Detail

copy

public Lattice copy()

Description copied from interface: Lattice

Returns a copy of this lattice.

chooseAggregate

public AggregateImpl chooseAggregate(double maxCost,
                            double minCostBenefitRatio,
                            Cost cost)

Description copied from interface: Lattice

Chooses the next un-materialized aggregate with the highest incremental benefit.

cost - Output parameter, is populated with the benefit and the number of queries which will benefit by materializing the chosen aggregate

Returns:

Chosen aggregate

materialize

public void materialize(AggregateImpl aggregate)

Description copied from interface: Lattice

Materializes an aggregate.

Specified by:

materialize in interface Lattice

Overrides:

materialize in class LatticeImpl

Parameters:

aggregate - Aggregate

costBenefitOf

public Algorithm.CostBenefit costBenefitOf(AggregateImpl aggregate)

Description copied from interface: Lattice

Returns an object representing the cost of the given aggregate, and benefit of adding it to the current lattice.

Parameters:

aggregate - Aggregate

Returns:

Incremental cost/benefit of the aggregate