net.openhft.chronicle.map

Interface DefaultValueProvider<K,V>

Type Parameters:

K - map key class

V - map value class

All Known Subinterfaces:

ExternalMapQueryContext<K,V,R>, MapAndSetContext<K,V,R>, MapContext<K,V,R>, MapQueryContext<K,V,R>, MapSegmentContext<K,V,R>

All Known Implementing Classes:

MapEntryOperationsDelegation, MapQuery, MapSegmentIteration, ReplicatedInput, ReplicatedMapQuery, ReplicatedMapSegmentIteration, SegmentsRecovery, WrappedValueBytesDataAccess, WrappedValueInstanceDataHolderAccess

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface DefaultValueProvider<K,V>

Default value computation strategy, used in ChronicleMapBuilder.defaultValueProvider(DefaultValueProvider) configuration.

Method Summary

Modifier and Type	Method and Description
Data<V>	defaultValue(MapAbsentEntry<K,V> absentEntry) Returns the "nil" value, which should be inserted into the map, in the given absentEntry context.

Method Detail

defaultValue

Data<V> defaultValue(@NotNull
                     MapAbsentEntry<K,V> absentEntry)

Returns the "nil" value, which should be inserted into the map, in the given absentEntry context. This is primarily used in ChronicleMap.acquireUsing(K, V) operation implementation, i. e. MapMethods.acquireUsing(net.openhft.chronicle.map.MapQueryContext<K, V, R>, net.openhft.chronicle.map.ReturnValue<V>).

The default implementation simply delegates to MapAbsentEntry.defaultValue().