org.infinispan.distribution.ch

Class UnionConsistentHash

java.lang.Object

org.infinispan.distribution.ch.AbstractConsistentHash

org.infinispan.distribution.ch.UnionConsistentHash

All Implemented Interfaces:

ConsistentHash

public class UnionConsistentHash
extends AbstractConsistentHash

A delegating wrapper that locates keys by getting a union of locations reported by two other ConsistentHash implementations it delegates to.

Since:

4.0

Author:

Manik Surtani

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	UnionConsistentHash.Externalizer

Field Summary

Fields inherited from class org.infinispan.distribution.ch.AbstractConsistentHash

groupManager

Constructor Summary

Constructors

Constructor and Description
UnionConsistentHash(ConsistentHash oldCH, ConsistentHash newCH)

Method Summary

Methods

Modifier and Type	Method and Description
Set<Address>	getCaches() Should return a collection of cache addresses in the cluster.
List<Integer>	getHashIds(Address a) Returns a list of values between 0 and the hash space limit, or hash id, for a particular address.
ConsistentHash	getNewConsistentHash()
ConsistentHash	getOldConsistentHash()
List<Address>	locate(Object key, int replCount) Locates a key, given a replication count (number of copies).
void	setCaches(Set<Address> caches) Sets the collection of cache addresses in the cluster.

Methods inherited from class org.infinispan.distribution.ch.AbstractConsistentHash

getBackupsForNode, getGrouping, getStateProvidersOnJoin, getStateProvidersOnLeave, isKeyLocalToAddress, locateAll, primaryLocation, setGroupManager, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

UnionConsistentHash

public UnionConsistentHash(ConsistentHash oldCH,
                   ConsistentHash newCH)

Method Detail

setCaches

public void setCaches(Set<Address> caches)

Description copied from interface: ConsistentHash

Sets the collection of cache addresses in the cluster. The implementation should store these internally and use these to locate keys.

Parameters:

caches - A set of unique caches in cluster.

getCaches

public Set<Address> getCaches()

Description copied from interface: ConsistentHash

Should return a collection of cache addresses in the cluster.

Returns:

set of unique of cache addresses

locate

public List<Address> locate(Object key,
                   int replCount)

Description copied from interface: ConsistentHash

Locates a key, given a replication count (number of copies).

Parameters:

key - key to locate

replCount - replication count (number of copies)

Returns:

a list of addresses where the key resides, where this list is a subset of the addresses set in ConsistentHash.setCaches(java.util.Set). Should never be null, and should contain replCount elements or the max number of caches available, whichever is smaller.

getHashIds

public List<Integer> getHashIds(Address a)

Description copied from interface: ConsistentHash

Returns a list of values between 0 and the hash space limit, or hash id, for a particular address. If virtual nodes are disabled, the list will only contain a single element, whereas if virtual nodes are enabled, this list's size will be the number of virtual nodes configured. If there are no hash ids for that address, it returns an empty list.

Returns:

A list of N size where N is the configured number of virtual nodes, or an empty list if there're no hash ids associated with the address.

getNewConsistentHash

public ConsistentHash getNewConsistentHash()

getOldConsistentHash

public ConsistentHash getOldConsistentHash()