com.hazelcast.replicatedmap.impl

Class ReplicatedMapService

java.lang.Object

com.hazelcast.replicatedmap.impl.ReplicatedMapService

All Implemented Interfaces:

EventPublishingService<Object,Object>, ManagedService, MigrationAwareService, RemoteService, SplitBrainHandlerService, StatisticsAwareService<LocalReplicatedMapStats>

public class ReplicatedMapService
extends Object
implements ManagedService, RemoteService, EventPublishingService<Object,Object>, MigrationAwareService, SplitBrainHandlerService, StatisticsAwareService<LocalReplicatedMapStats>

This is the main service implementation to handle proxy creation, event publishing, migration, anti-entropy and manages the backing PartitionContainers that actually hold the data

Field Summary

Fields

Modifier and Type	Field and Description
static int	INVOCATION_TRY_COUNT
static String	SERVICE_NAME

Constructor Summary

Constructors

Constructor and Description
ReplicatedMapService(NodeEngine nodeEngine)

Method Summary

Modifier and Type	Method and Description
void	beforeMigration(PartitionMigrationEvent event) Called before migration process starts, on both source and destination members.
void	commitMigration(PartitionMigrationEvent event) Commits the migration process for this service, on both source and destination members.
DistributedObject	createDistributedObject(String objectName) Creates a distributed object.
LocalReplicatedMapStatsImpl	createReplicatedMapStats(String name)
void	destroyDistributedObject(String objectName) Destroys a distributed object.
void	dispatchEvent(Object event, Object listener) Notifies the service of a published event.
Collection<ReplicatedRecordStore>	getAllReplicatedRecordStores(String name)
ReplicatedMapEventPublishingService	getEventPublishingService()
LocalReplicatedMapStatsImpl	getLocalMapStatsImpl(String name)
NodeEngine	getNodeEngine()
PartitionContainer	getPartitionContainer(int partitionId)
ReplicatedMapConfig	getReplicatedMapConfig(String name)
ReplicatedRecordStore	getReplicatedRecordStore(String name, boolean create, int partitionId)
ReplicatedRecordStore	getReplicatedRecordStore(String name, boolean create, Object key)
Map<String,LocalReplicatedMapStats>	getStats() Return the service statistics for the local instance.
void	init(NodeEngine nodeEngine, Properties properties) Initializes this ManagedService
void	initializeListeners(String name)
Runnable	prepareMergeRunnable() When the 2 separate clusters merge (resolve a split brain), this method is called to return a Runnable that will merge the clusters.
Operation	prepareReplicationOperation(PartitionReplicationEvent event) Returns an operation to replicate service data and/or state for a specific partition replica on another cluster member.
void	reset() reset this ManagedService back to initial state.
void	rollbackMigration(PartitionMigrationEvent event) Rollback the migration process for this service, on both source and destination members.
void	shutdown(boolean terminate) Shuts down this ManagedService.
void	triggerAntiEntropy() Send an operation to all replicas to check their replica versions for all partitions for which this node is the owner

Methods inherited from class java.lang.Object

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

Field Detail

SERVICE_NAME

public static final String SERVICE_NAME

See Also:

Constant Field Values

INVOCATION_TRY_COUNT

public static final int INVOCATION_TRY_COUNT

See Also:

Constant Field Values

Constructor Detail

ReplicatedMapService

public ReplicatedMapService(NodeEngine nodeEngine)

Method Detail

init

public void init(NodeEngine nodeEngine,
                 Properties properties)

Description copied from interface: ManagedService

Initializes this ManagedService

Specified by:

init in interface ManagedService

Parameters:

nodeEngine - the NodeEngine that this ManagedService belongs to.

properties - the Properties. Can be used to pass settings to the service.

triggerAntiEntropy

public void triggerAntiEntropy()

Send an operation to all replicas to check their replica versions for all partitions for which this node is the owner

reset

public void reset()

Description copied from interface: ManagedService

reset this ManagedService back to initial state. todo: what is the purpose of reset

Specified by:

reset in interface ManagedService

shutdown

public void shutdown(boolean terminate)

Description copied from interface: ManagedService

Shuts down this ManagedService. todo: what is the purpose of the terminate variable.

Specified by:

shutdown in interface ManagedService

Parameters:

terminate - true to shut down the ManagedService

getLocalMapStatsImpl

public LocalReplicatedMapStatsImpl getLocalMapStatsImpl(String name)

createReplicatedMapStats

public LocalReplicatedMapStatsImpl createReplicatedMapStats(String name)

createDistributedObject

public DistributedObject createDistributedObject(String objectName)

Description copied from interface: RemoteService

Creates a distributed object.

Specified by:

createDistributedObject in interface RemoteService

Parameters:

objectName - the name for the created distributed object

Returns:

the created distributed object

destroyDistributedObject

public void destroyDistributedObject(String objectName)

Description copied from interface: RemoteService

Destroys a distributed object.

Specified by:

destroyDistributedObject in interface RemoteService

Parameters:

objectName - the name of the distributed object to destroy

dispatchEvent

public void dispatchEvent(Object event,
                          Object listener)

Description copied from interface: EventPublishingService

Notifies the service of a published event.

Specified by:

dispatchEvent in interface EventPublishingService<Object,Object>

Parameters:

event - the published event

listener - the listener registered for this event

getReplicatedMapConfig

public ReplicatedMapConfig getReplicatedMapConfig(String name)

getReplicatedRecordStore

public ReplicatedRecordStore getReplicatedRecordStore(String name,
                                                      boolean create,
                                                      Object key)

getReplicatedRecordStore

public ReplicatedRecordStore getReplicatedRecordStore(String name,
                                                      boolean create,
                                                      int partitionId)

getAllReplicatedRecordStores

public Collection<ReplicatedRecordStore> getAllReplicatedRecordStores(String name)

initializeListeners

public void initializeListeners(String name)

getPartitionContainer

public PartitionContainer getPartitionContainer(int partitionId)

getNodeEngine

public NodeEngine getNodeEngine()

getEventPublishingService

public ReplicatedMapEventPublishingService getEventPublishingService()

prepareReplicationOperation

public Operation prepareReplicationOperation(PartitionReplicationEvent event)

Description copied from interface: MigrationAwareService

Returns an operation to replicate service data and/or state for a specific partition replica on another cluster member.

This method will be called on source member whenever partitioning system requires to copy/replicate a partition replica. Returned operation will be executed on destination member. If operation fails by throwing exception, migration process will fail and will be rolled back.

Returning null is allowed and means service does not have anything to replicate.

Specified by:

prepareReplicationOperation in interface MigrationAwareService

Parameters:

event - replication

Returns:

replication operation or null if nothing will be replicated

beforeMigration

public void beforeMigration(PartitionMigrationEvent event)

Description copied from interface: MigrationAwareService

Called before migration process starts, on both source and destination members.

Service can take actions required before migration. Migration process will block until this method returns. If this method fails by throwing an exception, migration process for specific partition will fail and will be rolled back.

Specified by:

beforeMigration in interface MigrationAwareService

Parameters:

event - migration event

commitMigration

public void commitMigration(PartitionMigrationEvent event)

Description copied from interface: MigrationAwareService

Commits the migration process for this service, on both source and destination members. This method will be called after all replication operations are executed successfully on destination and master member receives success response from all participants.

Commit is not expected to fail at this point, all exceptions will be suppressed and logged. Implementations of this method must be thread safe as this method may be called concurrently for different migrations on different partitions.

Specified by:

commitMigration in interface MigrationAwareService

Parameters:

event - migration event

rollbackMigration

public void rollbackMigration(PartitionMigrationEvent event)

Description copied from interface: MigrationAwareService

Rollback the migration process for this service, on both source and destination members. This method will be called when migration process fails at any moment. Reasons for failure may be an exception thrown on any migration step or failure(s) of any of the migration participants; either master or source or destination.

Rollback is not expected to fail at this point, all exceptions will be suppressed and logged. Implementations of this method must be thread safe as this method may be called concurrently for different migrations on different partitions.

Specified by:

rollbackMigration in interface MigrationAwareService

Parameters:

event - migration event

prepareMergeRunnable

public Runnable prepareMergeRunnable()

Description copied from interface: SplitBrainHandlerService

When the 2 separate clusters merge (resolve a split brain), this method is called to return a Runnable that will merge the clusters.

Specified by:

prepareMergeRunnable in interface SplitBrainHandlerService

Returns:

a Runnable that will merge the clusters

getStats

public Map<String,LocalReplicatedMapStats> getStats()

Description copied from interface: StatisticsAwareService

Return the service statistics for the local instance.

Specified by:

getStats in interface StatisticsAwareService<LocalReplicatedMapStats>

Returns:

the statistics, grouped by distributed object name