Class ExpirationTimeMergePolicy<K,V>

java.lang.Object

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

Type Parameters:

K - key type

V - value type

All Implemented Interfaces:

MergePolicy<K,V>

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

Merge policy that keeps the entry that will expire later.

Entries without an expiration time use MergePolicy.NO_EXPIRATION_TIME_MILLIS, so they win over entries with finite TTLs. When expiration times tie, the policy falls back to the same deterministic timestamp and writer-id ordering as LatestUpdateMergePolicy.

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
ExpirationTimeMergePolicy()

Method Summary

Modifier and Type	Method	Description
static <K,V> @NonNull ExpirationTimeMergePolicy<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

ExpirationTimeMergePolicy

public ExpirationTimeMergePolicy()

Method Details

instance

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

Return the shared instance of this stateless policy.

Type Parameters:

K - key type

V - value type

Returns:

a shared ExpirationTimeMergePolicy 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)