Class DiscardMergePolicy<K,V>

java.lang.Object

com.loomcache.server.wan.merge.DiscardMergePolicy<K,V>

Type Parameters:

K - key type

V - value type

All Implemented Interfaces:

MergePolicy<K,V>

public final class DiscardMergePolicy<K,V>
extends Object
implements MergePolicy<K,V>

Reject-all merge policy.

Never applies the incoming WAN value. Existing local values remain unchanged and absent keys stay absent. This mirrors Hazelcast's discard policy for deployments where the target cluster is authoritative and WAN events should only be observed or counted, not materialized.

Since:

2.0

Nested Class Summary

Nested classes/interfaces inherited from interface MergePolicy

MergePolicy.MergeEntry<V>

Field Summary

Fields inherited from interface MergePolicy

NO_EXPIRATION_TIME_MILLIS

Constructor Summary

Constructors

Constructor	Description
DiscardMergePolicy()

Method Summary

Modifier and Type	Method	Description
static <K,V> @NonNull DiscardMergePolicy<K,V>	instance()	Return the shared instance of this stateless policy.
@NonNull Optional<V>	merge(@NonNull K key, @NonNull MergePolicy.MergeEntry<V> incoming, @Nullable MergePolicy.MergeEntry<V> existing)	Merge an incoming replication entry against the existing local entry.

Methods inherited from class Object

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

Constructor Details

DiscardMergePolicy

public DiscardMergePolicy()

Method Details

instance

public static <K,V>
@NonNull DiscardMergePolicy<K,V> instance()

Return the shared instance of this stateless policy.

Type Parameters:

K - key type

V - value type

Returns:

a shared DiscardMergePolicy instance

merge

public @NonNull Optional<V> merge(@NonNull K key,
 @NonNull MergePolicy.MergeEntry<V> incoming,
 @Nullable MergePolicy.MergeEntry<V> existing)

Description copied from interface: MergePolicy

Merge an incoming replication entry against the existing local entry.

Specified by:

merge in interface MergePolicy<K,V>

Parameters:

key - the key being replicated (non-null)

incoming - the incoming entry from the remote cluster (non-null)

existing - the current local entry, or null if the key has no local value

Returns:

the value to keep (non-empty to apply, empty to reject the incoming)