org.janusgraph.graphdb.database.idassigner.placement

Class PartitionIDRange

java.lang.Object

org.janusgraph.graphdb.database.idassigner.placement.PartitionIDRange

public class PartitionIDRange
extends Object

An instance of this class describes a range of partition ids. This range if defined by a lower id (inclusive) and upper id (exclusive). When lowerId < upperId this partition range is called a proper range since it describes the contiguous block of ids from lowerId until upperId. When lowerId >= upperID then the partition block "wraps around" the specified idUpperBound. In other words, it describes the ids from [lowerId,idUpperBound) AND [0,upperId). It is always true that lowerID and upperID are smaller or equal than idUpperBound.

Author:

Matthias Broecheler ([email protected])

Constructor Summary

Constructors

Constructor and Description
PartitionIDRange(int lowerID, int upperID, int idUpperBound)

Method Summary

Modifier and Type	Method and Description
boolean	contains(int partitionId) Returns true of the given partitionId lies within this partition id range, else false.
int[]	getAllContainedIDs()
static List<PartitionIDRange>	getGlobalRange(int partitionBits)
static List<PartitionIDRange>	getIDRanges(int partitionBits, List<KeyRange> locals)
int	getIdUpperBound()
int	getLowerID()
int	getRandomID() Returns a random partition id that lies within this partition id range.
int	getUpperID()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

PartitionIDRange

public PartitionIDRange(int lowerID,
                        int upperID,
                        int idUpperBound)

Method Detail

getLowerID

public int getLowerID()

getUpperID

public int getUpperID()

getIdUpperBound

public int getIdUpperBound()

getAllContainedIDs

public int[] getAllContainedIDs()

contains

public boolean contains(int partitionId)

Returns true of the given partitionId lies within this partition id range, else false.

Parameters:

partitionId -

Returns:

toString

public String toString()

Overrides:

toString in class Object

getRandomID

public int getRandomID()

Returns a random partition id that lies within this partition id range.

Returns:

getGlobalRange

public static List<PartitionIDRange> getGlobalRange(int partitionBits)

getIDRanges

public static List<PartitionIDRange> getIDRanges(int partitionBits,
                                                 List<KeyRange> locals)