org.apache.druid.query.monomorphicprocessing

Class SpecializationState<T>

java.lang.Object

org.apache.druid.query.monomorphicprocessing.SpecializationState<T>

Type Parameters:

T - type of query processing algorithm

public abstract class SpecializationState<T>
extends Object

See Also:

SpecializationService

Constructor Summary

Constructors

Constructor and Description
SpecializationState()

Method Summary

Modifier and Type	Method and Description
abstract void	accountLoopIterations(long loopIterations) Accounts the number of loop iterations, made when processing queries without specialized algorithm, i.
abstract T	getSpecialized() Returns an instance of specialized version of query processing algorithm, if available, null otherwise.
T	getSpecializedOrDefault(T defaultInstance) Returns an instance of specialized version of query processing algorithm, if available, defaultInstance otherwise.

Methods inherited from class java.lang.Object

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

Constructor Detail

SpecializationState

public SpecializationState()

Method Detail

getSpecialized

@Nullable
public abstract T getSpecialized()

Returns an instance of specialized version of query processing algorithm, if available, null otherwise.

getSpecializedOrDefault

public final T getSpecializedOrDefault(T defaultInstance)

Returns an instance of specialized version of query processing algorithm, if available, defaultInstance otherwise.

accountLoopIterations

public abstract void accountLoopIterations(long loopIterations)

Accounts the number of loop iterations, made when processing queries without specialized algorithm, i. e. after getSpecialized() returned null. If sufficiently many loop iterations were made, SpecializationService decides that the algorithm is worth to be specialized, and getSpecialized() will return non-null during later queries.