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com.tangosol.net.partition
Class DefaultKeyPartitioningStrategy

java.lang.Object
com.tangosol.util.Base
com.tangosol.util.BitHelper
com.tangosol.util.ExternalizableHelper
com.tangosol.net.partition.DefaultKeyPartitioningStrategy

All Implemented Interfaces:

KeyPartitioningStrategy

Direct Known Subclasses:

BroadKeyPartitioningStrategy

public class DefaultKeyPartitioningStrategy

extends ExternalizableHelper

implements KeyPartitioningStrategy

DefaultKeyPartitioningStrategy provides a simple strategy for assigning keys to partitions which is based on the hash code of keys in internal (serialized to Binary) form.

Since:

Coherence 3.6

Author:

gg 2010.05.19

Field Summary

protected PartitionedService

m_service The PartitionedService that this strategy is bound to.

Constructor Summary

DefaultKeyPartitioningStrategy()
Default constructor.

Method Summary

static int	calculateKeyPartition(PartitionedService service, Object oKey) Determine the partition to which the given key should be assigned for the specified PartitionService, taking into consideration the associations provided by the service's KeyAssociator.
PartitionSet	getAssociatedPartitions(Object oKey) Determine the set of partitions that all keys associated with the specified key are assigned to.
int	getKeyPartition(Object oKey) Determine the partition to which a particular key should be assigned.
void	init(PartitionedService service) Initialize the KeyPartitioningStrategy and bind it to the specified PartitionedService.

Methods inherited from class com.tangosol.util.BitHelper

countBits, countBits, countBits, indexOfLSB, indexOfLSB, indexOfLSB, indexOfMSB, indexOfMSB, indexOfMSB, rotateLeft, rotateLeft, rotateLeft, rotateRight, rotateRight, rotateRight, toBitString, toBitString, toBitString

Field Detail

m_service

protected PartitionedService m_service

The PartitionedService that this strategy is bound to.

Constructor Detail

DefaultKeyPartitioningStrategy

public DefaultKeyPartitioningStrategy()

Default constructor.

Method Detail

init

public void init(PartitionedService service)

Initialize the KeyPartitioningStrategy and bind it to the specified PartitionedService.

Specified by:

init in interface KeyPartitioningStrategy

Parameters:

service - the PartitionedService that this strategy is being bound to

getKeyPartition

public int getKeyPartition(Object oKey)

Determine the partition to which a particular key should be assigned. <p/> In general, the implementations are expected to respect the associations provided by the service's KeyAssociator in such a way that keys that return the same associated key would be assigned to the same partition. <p/> The resulting partition must be in the range [0..N-1], where N is the value returned from PartitionedService.getPartitionCount().

Specified by:

getKeyPartition in interface KeyPartitioningStrategy

Parameters:

oKey - a key in its Object form

Returns:

the partition ID that the specified key is assigned to

See Also:

PartitionAssignmentStrategy.getPartitionOwner(int)

getAssociatedPartitions

public PartitionSet getAssociatedPartitions(Object oKey)

Determine the set of partitions that all keys associated with the specified key are assigned to. Most commonly, this method returns a partition set containing a single partition returned by the getKeyPartition method.

Specified by:

getAssociatedPartitions in interface KeyPartitioningStrategy

Parameters:

oKey - a key in its Object form

Returns:

the PartitionSet associated with the specified key

calculateKeyPartition

public static int calculateKeyPartition(PartitionedService service,
                                        Object oKey)

Determine the partition to which the given key should be assigned for the specified PartitionService, taking into consideration the associations provided by the service's KeyAssociator. <p/> The resulting partition will be in the range [0..N), where N is the value returned from the PartitionedService.getPartitionCount() method.

Parameters:

service - the PartitionedService

oKey - a key in its original (Object) format

Returns:

the parition that the corresponding key is assigned to

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