org.apache.cassandra.dht

Class Range<T extends RingPosition>

java.lang.Object

org.apache.cassandra.dht.AbstractBounds<T>

org.apache.cassandra.dht.Range<T>

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<Range<T>>

Direct Known Subclasses:

MerkleTree.TreeRange

public class Range<T extends RingPosition>
extends AbstractBounds<T>
implements java.lang.Comparable<Range<T>>, java.io.Serializable

A representation of the range that a node is responsible for on the DHT ring. A Range is responsible for the tokens between (left, right]. Used by the partitioner and by map/reduce by-token range scans.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.cassandra.dht.AbstractBounds

AbstractBounds.AbstractBoundsSerializer

Field Summary

Fields

Modifier and Type	Field and Description
static long	serialVersionUID

Fields inherited from class org.apache.cassandra.dht.AbstractBounds

left, partitioner, right, serializer

Constructor Summary

Constructors

Constructor and Description
Range(T left, T right)
Range(T left, T right, IPartitioner partitioner)

Method Summary

Methods

Modifier and Type	Method and Description
java.util.List<java.lang.String>	asList()
int	compareTo(Range<T> rhs)
boolean	contains(Range<T> that)
boolean	contains(T point) Helps determine if a given point on the DHT ring is contained in the range in question.
static <T extends RingPosition> boolean	contains(T left, T right, T point)
java.util.Set<Range<T>>	differenceToFetch(Range<T> rhs) Calculate set of the difference ranges of given two ranges (as current (A, B] and rhs is (C, D]) which node will need to fetch when moving to a given new token
boolean	equals(java.lang.Object o)
protected java.lang.String	getClosingString()
protected java.lang.String	getOpeningString()
java.util.Set<Range<T>>	intersectionWith(Range<T> that)
boolean	intersects(AbstractBounds<T> that)
boolean	intersects(Bounds<T> that)
boolean	intersects(Range<T> that)
static <T extends RingPosition> boolean	isInRanges(T token, java.lang.Iterable<Range<T>> ranges)
boolean	isWrapAround()
static <T extends RingPosition> boolean	isWrapAround(T left, T right) Tells if the given range is a wrap around.
static Range<RowPosition>	makeRowRange(Token left, Token right, IPartitioner partitioner) Compute a range of keys corresponding to a given range of token.
static <T extends RingPosition> java.util.List<Range<T>>	normalize(java.util.Collection<Range<T>> ranges)
static <T extends RingPosition> java.util.Set<Range<T>>	rangeSet(Range<T>... ranges)
static <T extends RingPosition> java.util.Set<Range<T>>	rangeSet(Range<T> range)
Pair<AbstractBounds<T>,AbstractBounds<T>>	split(T position) Given token T and AbstractBounds ?L,R?, returns Pair(?L,T], (T,R?), where ? means that the same type of AbstractBounds is returned as the original.
java.util.Set<Range<T>>	subtract(Range<T> rhs)
AbstractBounds<RowPosition>	toRowBounds() Transform this abstract bounds to equivalent covering bounds of row positions.
java.lang.String	toString()
AbstractBounds<Token>	toTokenBounds() Transform this abstract bounds to a token abstract bounds.
java.util.List<Range<T>>	unwrap()
AbstractBounds<T>	withNewRight(T newRight)

Methods inherited from class org.apache.cassandra.dht.AbstractBounds

getString, hashCode, intersects

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

serialVersionUID

public static final long serialVersionUID

See Also:

Constant Field Values

Constructor Detail

Range

public Range(T left,
     T right)

Range

public Range(T left,
     T right,
     IPartitioner partitioner)

Method Detail

contains

public static <T extends RingPosition> boolean contains(T left,
                                        T right,
                                        T point)

contains

public boolean contains(Range<T> that)

contains

public boolean contains(T point)

Helps determine if a given point on the DHT ring is contained in the range in question.

Specified by:

contains in class AbstractBounds<T extends RingPosition>

Parameters:

point - point in question

Returns:

true if the point contains within the range else false.

intersects

public boolean intersects(Range<T> that)

Parameters:

that - range to check for intersection

Returns:

true if the given range intersects with this range.

intersects

public boolean intersects(AbstractBounds<T> that)

intersects

public boolean intersects(Bounds<T> that)

Parameters:

that - range to check for intersection

Returns:

true if the given range intersects with this range.

rangeSet

public static <T extends RingPosition> java.util.Set<Range<T>> rangeSet(Range<T>... ranges)

rangeSet

public static <T extends RingPosition> java.util.Set<Range<T>> rangeSet(Range<T> range)

intersectionWith

public java.util.Set<Range<T>> intersectionWith(Range<T> that)

Parameters:

that -

Returns:

the intersection of the two Ranges. this can be two disjoint Ranges if one is wrapping and one is not. say you have nodes G and M, with query range (D,T]; the intersection is (M-T] and (D-G]. If there is no intersection, an empty list is returned.

split

public Pair<AbstractBounds<T>,AbstractBounds<T>> split(T position)

Description copied from class: AbstractBounds

Given token T and AbstractBounds ?L,R?, returns Pair(?L,T], (T,R?), where ? means that the same type of AbstractBounds is returned as the original. Put another way, returns a Pair of everything this AbstractBounds contains up to and including the split position, and everything it contains after (not including the split position). The original AbstractBounds must either contain the position T, or T should be equals to the left bound L. If the split would only yield the same AbstractBound, null is returned instead.

Specified by:

split in class AbstractBounds<T extends RingPosition>

unwrap

public java.util.List<Range<T>> unwrap()

Specified by:

unwrap in class AbstractBounds<T extends RingPosition>

isWrapAround

public static <T extends RingPosition> boolean isWrapAround(T left,
                                            T right)

Tells if the given range is a wrap around.

compareTo

public int compareTo(Range<T> rhs)

Specified by:

compareTo in interface java.lang.Comparable<Range<T extends RingPosition>>

subtract

public java.util.Set<Range<T>> subtract(Range<T> rhs)

differenceToFetch

public java.util.Set<Range<T>> differenceToFetch(Range<T> rhs)

Calculate set of the difference ranges of given two ranges (as current (A, B] and rhs is (C, D]) which node will need to fetch when moving to a given new token

Parameters:

rhs - range to calculate difference

Returns:

set of difference ranges

isInRanges

public static <T extends RingPosition> boolean isInRanges(T token,
                                          java.lang.Iterable<Range<T>> ranges)

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getOpeningString

protected java.lang.String getOpeningString()

Specified by:

getOpeningString in class AbstractBounds<T extends RingPosition>

getClosingString

protected java.lang.String getClosingString()

Specified by:

getClosingString in class AbstractBounds<T extends RingPosition>

asList

public java.util.List<java.lang.String> asList()

isWrapAround

public boolean isWrapAround()

normalize

public static <T extends RingPosition> java.util.List<Range<T>> normalize(java.util.Collection<Range<T>> ranges)

Returns:

A copy of the given list of with all ranges unwrapped, sorted by left bound and with overlapping bounds merged.

makeRowRange

public static Range<RowPosition> makeRowRange(Token left,
                              Token right,
                              IPartitioner partitioner)

Compute a range of keys corresponding to a given range of token.

toRowBounds

public AbstractBounds<RowPosition> toRowBounds()

Description copied from class: AbstractBounds

Transform this abstract bounds to equivalent covering bounds of row positions. If this abstract bounds was already an abstractBounds of row positions, this is a noop.

Specified by:

toRowBounds in class AbstractBounds<T extends RingPosition>

toTokenBounds

public AbstractBounds<Token> toTokenBounds()

Description copied from class: AbstractBounds

Transform this abstract bounds to a token abstract bounds. If this abstract bounds was already an abstractBounds of token, this is a noop, otherwise this use the row position tokens.

Specified by:

toTokenBounds in class AbstractBounds<T extends RingPosition>

withNewRight

public AbstractBounds<T> withNewRight(T newRight)

Specified by:

withNewRight in class AbstractBounds<T extends RingPosition>