| /** |
| * 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 com.datatorrent.stram.util; |
| |
| import java.util.LinkedHashMap; |
| import java.util.Map; |
| |
| /** |
| * <p>LRUCache class.</p> |
| * |
| * @param <K> key |
| * @param <V> value |
| * @since 0.3.5 |
| */ |
| public class LRUCache<K, V> extends LinkedHashMap<K, V> |
| { |
| private static final long serialVersionUID = 1L; |
| private final int capacity; // Maximum number of items in the cache. |
| |
| public LRUCache(int capacity, boolean accessOrder) |
| { |
| super(capacity + 1, 1.0f, accessOrder); // Pass 'true' for accessOrder. |
| this.capacity = capacity; |
| } |
| |
| @Override |
| protected boolean removeEldestEntry(Map.Entry<K, V> entry) |
| { |
| return (size() > this.capacity); |
| } |
| |
| } |