com.hazelcast.map.merge

Interface MapMergePolicy

All Superinterfaces:

DataSerializable

All Known Implementing Classes:

HigherHitsMapMergePolicy, IgnoreMergingEntryMapMergePolicy, LatestUpdateMapMergePolicy, PassThroughMergePolicy, PutIfAbsentMapMergePolicy

public interface MapMergePolicy
extends DataSerializable

A policy for merging maps after a splitbrain was detected and the different network partitions need to be merged.

See Also:

MapMergePolicy, PutIfAbsentMapMergePolicy, LatestUpdateMapMergePolicy, PassThroughMergePolicy, HigherHitsMapMergePolicy

Method Summary

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.

Methods inherited from interface com.hazelcast.nio.serialization.DataSerializable

readData, writeData

Method Detail

merge

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

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.

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.