Package org.infinispan.conflict

Class MergePolicy.UnsupportedMergePolicy

java.lang.Object

org.infinispan.conflict.MergePolicy.UnsupportedMergePolicy

All Implemented Interfaces:

EntryMergePolicy

Enclosing class:

MergePolicy

public static class MergePolicy.UnsupportedMergePolicy
extends Object
implements EntryMergePolicy

Constructor Summary

Constructors

Constructor	Description
UnsupportedMergePolicy()

Method Summary

Modifier and Type	Method	Description
org.infinispan.container.entries.CacheEntry	merge(org.infinispan.container.entries.CacheEntry preferredEntry, List otherEntries)	This method is called by ConflictManager.resolveConflicts() for each conflict discovered to determine which CacheEntry should be utilised.

Constructor Detail

UnsupportedMergePolicy

public UnsupportedMergePolicy()

Method Detail

merge

public org.infinispan.container.entries.CacheEntry merge(org.infinispan.container.entries.CacheEntry preferredEntry,
                                                         List otherEntries)

Description copied from interface: EntryMergePolicy

This method is called by ConflictManager.resolveConflicts() for each conflict discovered to determine which CacheEntry should be utilised. This merge policy is used when a user explicitly calls ConflictManager.resolveConflicts() as well as when a partition merge occurs with PartitionHandling.ALLOW_READ_WRITES set. In the event of a partition merge, we define the preferred partition as the partition whom's coordinator is coordinating the current merge.

Specified by:

merge in interface EntryMergePolicy

Parameters:

preferredEntry - During a partition merge, the preferredEntry is the primary replica of a CacheEntry stored in the partition that contains the most nodes or if partitions are equal the one with the largest topologyId. In the event of overlapping partitions, i.e. a node A is present in the topology of both partitions {A}, {A,B,C}, we pick {A} as the preferred partition as it will have the higher topologId because the other partition's topology is behind. During a non-merge call to ConflictManager.resolveConflicts(), the preferredEntry is simply the primary owner of an entry

otherEntries - a List of all other CacheEntry associated with a given Key.

Returns:

the winning CacheEntry to be utilised across the cluster, or null if all entries for a key should be removed.