Package org.apache.wayang.profiler.log

Class DynamicEstimationContext

java.lang.Object

org.apache.wayang.profiler.log.DynamicEstimationContext

All Implemented Interfaces:

EstimationContext

public class DynamicEstimationContext
extends Object
implements EstimationContext

EstimationContext implementation for DynamicLoadEstimators.

Field Summary

Fields inherited from interface org.apache.wayang.core.optimizer.costs.EstimationContext

defaultSerializer

Constructor Summary

Constructors

Constructor	Description
DynamicEstimationContext(Individual individual, EstimationContext wrappedEstimationContext)

Method Summary

Modifier and Type	Method	Description
double	getDoubleProperty(String propertyKey, double fallback)	Retrieve a double-valued property in this context.
Individual	getIndividual()
CardinalityEstimate[]	getInputCardinalities()	Provide the input CardinalityEstimates for the Operator that corresponds to this instance.
int	getNumExecutions()	Retrieve the number of executions to be estimated.
CardinalityEstimate[]	getOutputCardinalities()	Provide the output CardinalityEstimates for the Operator that corresponds to this instance.
Collection<String>	getPropertyKeys()	Retrieve the eligible property keys for EstimationContext.getDoubleProperty(String, double).

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.wayang.core.optimizer.costs.EstimationContext

getNormalizedEstimationContext

Constructor Details

DynamicEstimationContext

public DynamicEstimationContext(Individual individual,
 EstimationContext wrappedEstimationContext)

Method Details

getInputCardinalities

public CardinalityEstimate[] getInputCardinalities()

Description copied from interface: EstimationContext

Provide the input CardinalityEstimates for the Operator that corresponds to this instance.

Specified by:

getInputCardinalities in interface EstimationContext

Returns:

the CardinalityEstimates, which can contain nulls

getOutputCardinalities

public CardinalityEstimate[] getOutputCardinalities()

Description copied from interface: EstimationContext

Provide the output CardinalityEstimates for the Operator that corresponds to this instance.

Specified by:

getOutputCardinalities in interface EstimationContext

Returns:

the CardinalityEstimates, which can contain nulls

getDoubleProperty

public double getDoubleProperty(String propertyKey,
 double fallback)

Description copied from interface: EstimationContext

Retrieve a double-valued property in this context.

Specified by:

getDoubleProperty in interface EstimationContext

Parameters:

propertyKey - the key for the property

fallback - the value to use if the property could not be delivered

Returns:

the property value or fallback

getNumExecutions

public int getNumExecutions()

Description copied from interface: EstimationContext

Retrieve the number of executions to be estimated.

Specified by:

getNumExecutions in interface EstimationContext

Returns:

the number of executions.

getPropertyKeys

public Collection<String> getPropertyKeys()

Description copied from interface: EstimationContext

Retrieve the eligible property keys for EstimationContext.getDoubleProperty(String, double).

Specified by:

getPropertyKeys in interface EstimationContext

Returns:

the property keys

getIndividual

public Individual getIndividual()