org.tools4j.nobark.queue

Interface Merger<K,V>

Type Parameters:

K - the type of the conflation key

V - the type of values in the createQueue

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 Merger<K,V>

Merger strategy passed to some conflation queues upon construction to support merging of values when conflation occurs.

Method Summary

Modifier and Type	Method and Description
V	merge(K conflationKey, V olderValue, V newValue) Method called to merge two values; the merged value is returned.

Method Detail

merge

V merge(K conflationKey,
        V olderValue,
        V newValue)

Method called to merge two values; the merged value is returned.

Parameters:

conflationKey - the conflation key

olderValue - the older value that was already present in the createQueue

newValue - the newer value that is currently being added to the createQueue

Returns:

the merged value; can be newValue itself but should not be olderValue as this instance is returned by the enqueue method and may be reused by the producer