com.hazelcast.replicatedmap.merge

Class LatestUpdateMapMergePolicy

java.lang.Object

com.hazelcast.replicatedmap.merge.LatestUpdateMapMergePolicy

All Implemented Interfaces:

DataSerializable, IdentifiedDataSerializable, ReplicatedMapMergePolicy, Serializable

public final class LatestUpdateMapMergePolicy
extends Object
implements ReplicatedMapMergePolicy, IdentifiedDataSerializable

LatestUpdateMapMergePolicy causes the merging entry to be merged from source to destination map if source entry has updated more recently than the destination entry.

This policy can only be used of the clocks of the machines are in sync.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static LatestUpdateMapMergePolicy	INSTANCE Single instance of this class

Method Summary

Modifier and Type	Method and Description
int	getFactoryId() Returns DataSerializableFactory factory ID for this class.
int	getId() Returns type identifier for this class.
Object	merge(String mapName, ReplicatedMapEntryView mergingEntry, ReplicatedMapEntryView existingEntry) Returns the value of the entry after the merge of entries with the same key.
void	readData(ObjectDataInput in) Reads fields from the input stream
void	writeData(ObjectDataOutput out) Writes object fields to output stream

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final LatestUpdateMapMergePolicy INSTANCE

Single instance of this class

Method Detail

merge

public Object merge(String mapName,
                    ReplicatedMapEntryView mergingEntry,
                    ReplicatedMapEntryView existingEntry)

Description copied from interface: ReplicatedMapMergePolicy

Returns the value of the entry after the merge of entries with the same key. You should consider the case where existingEntry's value is null.

Specified by:

merge in interface ReplicatedMapMergePolicy

Parameters:

mapName - name of the replicated map

mergingEntry - entry merging into the destination cluster

existingEntry - existing entry in the destination cluster

Returns:

final value of the entry. If returns null, then the entry will be removed.

getFactoryId

public int getFactoryId()

Description copied from interface: IdentifiedDataSerializable

Returns DataSerializableFactory factory ID for this class.

Specified by:

getFactoryId in interface IdentifiedDataSerializable

Returns:

factory ID

getId

public int getId()

Description copied from interface: IdentifiedDataSerializable

Returns type identifier for this class. It should be unique per DataSerializableFactory.

Specified by:

getId in interface IdentifiedDataSerializable

Returns:

type ID

writeData

public void writeData(ObjectDataOutput out)
               throws IOException

Description copied from interface: DataSerializable

Writes object fields to output stream

Specified by:

writeData in interface DataSerializable

Parameters:

out - output

Throws:

IOException

readData

public void readData(ObjectDataInput in)
              throws IOException

Description copied from interface: DataSerializable

Reads fields from the input stream

Specified by:

readData in interface DataSerializable

Parameters:

in - input

Throws:

IOException