/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.openjpa.lib.util.concurrent;
import java.util.Iterator;
import java.util.Map;
/**
* A highly concurrent map.
*
* @author Abe White
*/
public interface ConcurrentMap extends Map {
/**
* Remove an arbitrary(not strictly random) entry from the map. This
* allows implementation of concurrent caches with size ceilings.
*
* @return the removed entry, or null if map is empty
*/
public Map.Entry removeRandom();
/**
* Iterate over map entries, beginning at an arbitrary
* (not strictly random) entry.
*/
public Iterator randomEntryIterator();
}