com.hazelcast.spi.merge

Class PutIfAbsentMergePolicy<V,T extends MergingValue<V>>

java.lang.Object

com.hazelcast.spi.impl.merge.AbstractSplitBrainMergePolicy<V,T,Object>

com.hazelcast.spi.merge.PutIfAbsentMergePolicy<V,T>

Type Parameters:

V - the type of the merged value

T - the type of the merging value

All Implemented Interfaces:

DataSerializable, IdentifiedDataSerializable, SplitBrainMergePolicy<V,T,Object>

public class PutIfAbsentMergePolicy<V,T extends MergingValue<V>>
extends com.hazelcast.spi.impl.merge.AbstractSplitBrainMergePolicy<V,T,Object>

Merges data structure entries from source to destination if they don't exist in the destination data structure.

Since:

3.10

Constructor Summary

Constructors

Constructor and Description
PutIfAbsentMergePolicy()

Method Summary

Modifier and Type	Method and Description
int	getClassId() Returns type identifier for this class.
Object	merge(T mergingValue, T existingValue) Selects the value of either the merging or the existing MergingValue which should be merged.

Methods inherited from class com.hazelcast.spi.impl.merge.AbstractSplitBrainMergePolicy

getFactoryId, readData, writeData

Methods inherited from class java.lang.Object

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

Constructor Detail

PutIfAbsentMergePolicy

public PutIfAbsentMergePolicy()

Method Detail

merge

public Object merge(T mergingValue,
                    T existingValue)

Description copied from interface: SplitBrainMergePolicy

Selects the value of either the merging or the existing MergingValue which should be merged.

Note that the existing MergingValue instance may be null if no matching data could be found to the merging MergingValue.

Parameters:

mergingValue - MergingValue instance that has the merging data of the smaller sub-cluster

existingValue - MergingValue instance that has the existing data or null if no matching data exists

Returns:

the selected value for merging

getClassId

public int getClassId()

Description copied from interface: IdentifiedDataSerializable

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

Returns:

type ID