com.carrotsearch.hppc

Class HashOrderMixing

java.lang.Object

com.carrotsearch.hppc.HashOrderMixing

public final class HashOrderMixing
extends java.lang.Object

Factory methods to acquire the most common types of HashOrderMixingStrategy.

See Also:

HashOrderMixingStrategy

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	HashOrderMixing.Strategy

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	PROPERTY_BIT_MIXER

Method Summary

Modifier and Type	Method and Description
static HashOrderMixingStrategy	constant(long seed) A constant HashOrderMixingStrategy.
static HashOrderMixingStrategy	defaultStrategy() Returns the currently configured default HashOrderMixingStrategy.
static HashOrderMixingStrategy	deterministic() Deprecated. Permanently deprecated as a warning signal.
static HashOrderMixingStrategy	none() Deprecated. Permanently deprecated as a warning signal.
static HashOrderMixingStrategy	randomized() Returns a randomized HashOrderMixingStrategy that issues unique per-container seed.

Methods inherited from class java.lang.Object

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

Field Detail

PROPERTY_BIT_MIXER

public static final java.lang.String PROPERTY_BIT_MIXER

See Also:

Constant Field Values

Method Detail

randomized

public static HashOrderMixingStrategy randomized()

Returns a randomized HashOrderMixingStrategy that issues unique per-container seed. This minimizes the chances of hash distribution conflicts.

constant

public static HashOrderMixingStrategy constant(long seed)

A constant HashOrderMixingStrategy. This is useful if one needs to have deterministic key distribution but wishes to control it manually. Do not use the same constant for more than one container. Consider using scatter maps or sets instead of constant hash order mixer.

deterministic

@Deprecated
public static HashOrderMixingStrategy deterministic()

Deprecated. Permanently deprecated as a warning signal.

Deterministic HashOrderMixingStrategy will reorder keys depending on the size of the container's buffer. This is inherently unsafe with hash containers using linear conflict addressing. The only use case when this can be useful is to count/ collect unique keys (for which scatter tables should be used).

none

@Deprecated
public static HashOrderMixingStrategy none()

Deprecated. Permanently deprecated as a warning signal.

This strategy does not change the hash order of keys at all. This is inherently unsafe with hash containers using linear conflict addressing. The only use case when this can be useful is to count/ collect unique keys (for which scatter tables should be used).

defaultStrategy

public static HashOrderMixingStrategy defaultStrategy()

Returns the currently configured default HashOrderMixingStrategy.