com.hazelcast.map.merge

Class PutIfAbsentMapMergePolicy

java.lang.Object

com.hazelcast.map.merge.PutIfAbsentMapMergePolicy

All Implemented Interfaces:

MapMergePolicy, DataSerializable

public class PutIfAbsentMapMergePolicy
extends Object
implements MapMergePolicy, DataSerializable

PutIfAbsentMapMergePolicy causes the merging entry to be merged from source to destination map if it does not exist in the destination map.

Constructor Summary

Constructors

Constructor and Description
PutIfAbsentMapMergePolicy()

Method Summary

Methods

Modifier and Type	Method and Description
Object	merge(String mapName, EntryView mergingEntry, EntryView 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

Constructor Detail

PutIfAbsentMapMergePolicy

public PutIfAbsentMapMergePolicy()

Method Detail

merge

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

Description copied from interface: MapMergePolicy

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 MapMergePolicy

Parameters:

mapName - name of the 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.

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