com.hazelcast.cache.merge

Class PutIfAbsentCacheMergePolicy

java.lang.Object

com.hazelcast.cache.merge.PutIfAbsentCacheMergePolicy

All Implemented Interfaces:

CacheMergePolicy, StorageTypeAwareCacheMergePolicy, Serializable

public class PutIfAbsentCacheMergePolicy
extends Object
implements StorageTypeAwareCacheMergePolicy

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

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
PutIfAbsentCacheMergePolicy()

Method Summary

Modifier and Type	Method and Description
Object	merge(String cacheName, CacheEntryView mergingEntry, CacheEntryView existingEntry) Selects one of the merging and existing cache entries to be merged.

Methods inherited from class java.lang.Object

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

Constructor Detail

PutIfAbsentCacheMergePolicy

public PutIfAbsentCacheMergePolicy()

Method Detail

merge

public Object merge(String cacheName,
                    CacheEntryView mergingEntry,
                    CacheEntryView existingEntry)

Description copied from interface: CacheMergePolicy

Selects one of the merging and existing cache entries to be merged.

Note that the existingEntry may be null if there is no entry with the same key in the destination cache. This happens, when the entry for that key was

• only created in the smaller sub-cluster during the split-brain
• removed in the larger sub-cluster during the split-brain

Specified by:

merge in interface CacheMergePolicy

Parameters:

cacheName - name of the cache

mergingEntry - CacheEntryView instance that has the cache entry to be merged

existingEntry - CacheEntryView instance that has the existing cache entry or null if there is no existing cache entry

Returns:

the selected value for merging or null if the entry should be removed