1 package org.apache.commons.jcs.utils.struct; 2 3 /* 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, 15 * software distributed under the License is distributed on an 16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 17 * KIND, either express or implied. See the License for the 18 * specific language governing permissions and limitations 19 * under the License. 20 */ 21 22 import java.util.concurrent.atomic.AtomicInteger; 23 24 /** 25 * 26 * @author Wiktor Niesiobędzki 27 * 28 * Simple LRUMap implementation that keeps the number of the objects below or equal maxObjects 29 * 30 * @param <K> 31 * @param <V> 32 */ 33 public class LRUMap<K, V> extends AbstractLRUMap<K, V> 34 { 35 36 /** if the max is less than 0, there is no limit! */ 37 int maxObjects = -1; 38 AtomicInteger counter = new AtomicInteger(0); 39 40 public LRUMap() 41 { 42 super(); 43 } 44 45 /** 46 * 47 * @param maxObjects 48 * maximum number to keep in the map 49 */ 50 public LRUMap(int maxObjects) 51 { 52 super(); 53 this.maxObjects = maxObjects; 54 } 55 56 @Override 57 public boolean shouldRemove() 58 { 59 return maxObjects > 0 && this.size() > maxObjects; 60 } 61 62 public Object getMaxCounter() 63 { 64 return maxObjects; 65 } 66 }