| package org.apache.commons.jcs.utils.struct; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** |
| * |
| * @author Wiktor Niesiobędzki |
| * |
| * Simple LRUMap implementation that keeps the number of the objects below or equal maxObjects |
| * |
| * @param <K> |
| * @param <V> |
| */ |
| public class LRUMap<K, V> extends AbstractLRUMap<K, V> |
| { |
| |
| /** if the max is less than 0, there is no limit! */ |
| int maxObjects = -1; |
| AtomicInteger counter = new AtomicInteger(0); |
| |
| public LRUMap() |
| { |
| super(); |
| } |
| |
| /** |
| * |
| * @param maxObjects |
| * maximum number to keep in the map |
| */ |
| public LRUMap(int maxObjects) |
| { |
| super(); |
| this.maxObjects = maxObjects; |
| } |
| |
| @Override |
| public boolean shouldRemove() |
| { |
| return maxObjects > 0 && this.size() > maxObjects; |
| } |
| |
| public Object getMaxCounter() |
| { |
| return maxObjects; |
| } |
| } |