Package com.hazelcast.map

Interface MapEvictionPolicyComparator<K,V>

Type Parameters:

K - type of the key

V - type of the value

All Superinterfaces:

java.util.Comparator<EntryView<K,V>>, EvictionPolicyComparator<K,V,EntryView<K,V>>, java.io.Serializable

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 MapEvictionPolicyComparator<K,V>
extends EvictionPolicyComparator<K,V,EntryView<K,V>>

IMap specific EvictionPolicyComparator for comparing EntryViews to be evicted.

Implementors of the comparator have to implement equals and hashCode methods to support correct config comparison.

Note that you may need to enable per entry stats via MapConfig.setPerEntryStatsEnabled(boolean) to see all fields of entry view in your implementation.

See Also:

EvictionPolicyComparator, EntryView, MapConfig.setPerEntryStatsEnabled(boolean)

Method Summary

Modifier and Type	Method	Description
int	compare(EntryView<K,V> o1, EntryView<K,V> o2)	Compares the given EntryView instances and returns the result.

Methods inherited from interface java.util.Comparator

equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Method Detail

compare

int compare(EntryView<K,V> o1,
            EntryView<K,V> o2)

Compares the given EntryView instances and returns the result.

The result should be one of:

• -1: first entry has higher priority to be evicted
• 1: second entry has higher priority to be evicted
• 0: both entries have same priority

Specified by:

compare in interface java.util.Comparator<K>

Parameters:

o1 - the first EntryView instance to be compared

o2 - the second EntryView instance to be compared

Returns:

the result of comparison