org.apache.cassandra.dht

Class Token

java.lang.Object

org.apache.cassandra.dht.Token

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<Token>, RingPosition<Token>

Direct Known Subclasses:

ByteOrderedPartitioner.BytesToken, LocalPartitioner.LocalToken, Murmur3Partitioner.LongToken, OrderPreservingPartitioner.StringToken, RandomPartitioner.BigIntegerToken

public abstract class Token
extends java.lang.Object
implements RingPosition<Token>, java.io.Serializable

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Token.KeyBound
static class	Token.TokenFactory
static class	Token.TokenSerializer

Field Summary

Fields

Modifier and Type	Field and Description
static Token.TokenSerializer	serializer

Constructor Summary

Constructors

Constructor and Description
Token()

Method Summary

Modifier and Type	Method and Description
abstract long	getHeapSize()
abstract IPartitioner	getPartitioner()
Token	getToken()
abstract java.lang.Object	getTokenValue()
abstract Token	increaseSlightly() Returns a token that is slightly greater than this.
boolean	isMinimum()
Token.KeyBound	maxKeyBound()
Token.KeyBound	minKeyBound()
Token	minValue()
abstract double	size(Token next) Returns a measure for the token space covered between this token and next.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Comparable

compareTo

Field Detail

serializer

public static final Token.TokenSerializer serializer

Constructor Detail

Token

public Token()

Method Detail

getPartitioner

public abstract IPartitioner getPartitioner()

Specified by:

getPartitioner in interface RingPosition<Token>

getHeapSize

public abstract long getHeapSize()

getTokenValue

public abstract java.lang.Object getTokenValue()

size

public abstract double size(Token next)

Returns a measure for the token space covered between this token and next. Used by the token allocation algorithm (see CASSANDRA-7032).

increaseSlightly

public abstract Token increaseSlightly()

Returns a token that is slightly greater than this. Used to avoid clashes between nodes in separate datacentres trying to use the same token via the token allocation algorithm.

getToken

public Token getToken()

Specified by:

getToken in interface RingPosition<Token>

minValue

public Token minValue()

Specified by:

minValue in interface RingPosition<Token>

isMinimum

public boolean isMinimum()

Specified by:

isMinimum in interface RingPosition<Token>

minKeyBound

public Token.KeyBound minKeyBound()

maxKeyBound

public Token.KeyBound maxKeyBound()