com.hazelcast.spi.partition

Interface IPartitionService

All Superinterfaces:

CoreService

public interface IPartitionService
extends CoreService

An SPI service for accessing partition related information.

Field Summary

Fields

Modifier and Type	Field and Description
static String	SERVICE_NAME The name of the service.

Method Summary

Modifier and Type	Method and Description
String	addLocalPartitionLostListener(PartitionLostListener partitionLostListener)
String	addMigrationListener(MigrationListener migrationListener)
String	addPartitionLostListener(PartitionLostListener partitionLostListener)
int	getMaxAllowedBackupCount() Returns maximum allowed backup count according to current cluster formation and partition group configuration.
List<Integer>	getMemberPartitions(Address target) Returns partition ID list assigned to given target.
Map<Address,List<Integer>>	getMemberPartitionsMap() Gets member partition IDs.
long	getMigrationQueueSize()
IPartition	getPartition(int partitionId) Returns the IPartition for a given partition ID.
IPartition	getPartition(int partitionId, boolean triggerOwnerAssignment) Returns the IPartition for a given partition ID.
int	getPartitionCount() Returns the number of partitions.
int	getPartitionId(Data key) Returns the partition ID for a Data key.
int	getPartitionId(Object key) Returns the partition ID for a given object.
Address	getPartitionOwner(int partitionId) Gets the owner of the partition if it's set.
Address	getPartitionOwnerOrWait(int partitionId) Gets the owner of the partition.
IPartition[]	getPartitions() Returns an array of IPartition instances.
int	getPartitionStateVersion()
boolean	hasOnGoingMigration() Checks if there are any cluster-wide migrations.
boolean	hasOnGoingMigrationLocal() Checks if there are any local migrations.
boolean	isMemberStateSafe() Queries and returns if this member in a safe state or not.
boolean	isPartitionOwner(int partitionId) Check if this node is the owner of a partition.
boolean	removeMigrationListener(String registrationId)
boolean	removePartitionLostListener(String registrationId)

Field Detail

SERVICE_NAME

static final String SERVICE_NAME

The name of the service.

See Also:

Constant Field Values

Method Detail

getPartitionOwner

Address getPartitionOwner(int partitionId)

Gets the owner of the partition if it's set.

If the owner of the partition is not set yet, it will trigger partition assignment.

Parameters:

partitionId - the partitionId

Returns:

owner of partition or null if it's not set yet

getPartitionOwnerOrWait

Address getPartitionOwnerOrWait(int partitionId)

Gets the owner of the partition.

If none is set, it will wait till the owner is set.

Parameters:

partitionId - the partitionId

Returns:

owner of partition

Throws:

InterruptedException

NoDataMemberInClusterException - if all nodes are lite members and partitions can't be assigned

getPartition

IPartition getPartition(int partitionId)

Returns the IPartition for a given partition ID.

If the owner of the partition is not set yet, it will trigger partition assignment.

The IPartition for a given partition ID will never change, so the result can be cached safely.

Parameters:

partitionId - the partition ID

Returns:

the IPartition

getPartition

IPartition getPartition(int partitionId,
                        boolean triggerOwnerAssignment)

Returns the IPartition for a given partition ID.

If the owner of the partition is not set yet and triggerOwnerAssignment is true, it will trigger partition assignment.

The IPartition for a given partition ID will never change, so the result can be cached safely.

Parameters:

partitionId - the partition ID

triggerOwnerAssignment - flag to trigger the partition assignment

Returns:

the IPartition

getPartitionId

int getPartitionId(Data key)

Returns the partition ID for a Data key.

Parameters:

key - the Data key

Returns:

the partition ID

Throws:

NullPointerException - if key is null

getPartitionId

int getPartitionId(Object key)

Returns the partition ID for a given object.

Parameters:

key - the object key

Returns:

the partition ID

getPartitionCount

int getPartitionCount()

Returns the number of partitions.

Returns:

the number of partitions

getMemberPartitions

List<Integer> getMemberPartitions(Address target)

Returns partition ID list assigned to given target.

If the owner of the partition is not set yet, it will trigger partition assignment.

Returns:

partition ID list assigned to given target

getMemberPartitionsMap

Map<Address,List<Integer>> getMemberPartitionsMap()

Gets member partition IDs.

Blocks until partitions are assigned.

Returns:

map of member address to partition IDs

addMigrationListener

String addMigrationListener(MigrationListener migrationListener)

removeMigrationListener

boolean removeMigrationListener(String registrationId)

addPartitionLostListener

String addPartitionLostListener(PartitionLostListener partitionLostListener)

addLocalPartitionLostListener

String addLocalPartitionLostListener(PartitionLostListener partitionLostListener)

removePartitionLostListener

boolean removePartitionLostListener(String registrationId)

getMigrationQueueSize

long getMigrationQueueSize()

isMemberStateSafe

boolean isMemberStateSafe()

Queries and returns if this member in a safe state or not.

This method just checks for a safe state, it doesn't force this member to be in a safe state.

Returns:

true if this member in a safe state, otherwise false

getMaxAllowedBackupCount

int getMaxAllowedBackupCount()

Returns maximum allowed backup count according to current cluster formation and partition group configuration.

The returned number will be in the range of [0, IPartition.MAX_BACKUP_COUNT].

Returns:

max allowed backup count

getPartitionStateVersion

int getPartitionStateVersion()

hasOnGoingMigration

boolean hasOnGoingMigration()

Checks if there are any cluster-wide migrations.

Returns:

true if there are migrations, false otherwise.

hasOnGoingMigrationLocal

boolean hasOnGoingMigrationLocal()

Checks if there are any local migrations.

Returns:

true if there are migrations, false otherwise.

isPartitionOwner

boolean isPartitionOwner(int partitionId)

Check if this node is the owner of a partition.

Parameters:

partitionId - the partition ID

Returns:

true if the node owns the partition, false if the node doesn't own the partition or if the partition hasn't been assigned yet

getPartitions

IPartition[] getPartitions()

Returns an array of IPartition instances.

Note: Creates a new array on each invocation, not recommended to use in high-loaded parts of code.

Returns:

array of IPartition instances