org.apache.openjpa.lib.util.concurrent

Interface ConcurrentMap

All Superinterfaces:

Map

All Known Implementing Classes:

ConcurrentHashMap, ConcurrentReferenceHashMap

public interface ConcurrentMap
extends Map

A highly concurrent map.

Author:

Abe White

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Method Summary

Modifier and Type	Method and Description
Iterator	randomEntryIterator() Iterate over map entries, beginning at an arbitrary (not strictly random) entry.
Map.Entry	removeRandom() Remove an arbitrary(not strictly random) entry from the map.

Methods inherited from interface java.util.Map

clear, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, equals, forEach, get, getOrDefault, hashCode, isEmpty, keySet, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size, values

Method Detail

removeRandom

Map.Entry removeRandom()

Remove an arbitrary(not strictly random) entry from the map. This allows implementation of concurrent caches with size ceilings.

Returns:

the removed entry, or null if map is empty

randomEntryIterator

Iterator randomEntryIterator()

Iterate over map entries, beginning at an arbitrary (not strictly random) entry.