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Java > Open Source Codes > org > apache > servicemix > components > cache > LRUCache


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 package org.apache.servicemix.components.cache;
18
19 import java.util.LinkedHashMap JavaDoc;
20 import java.util.Map JavaDoc;
21
22 /**
23  * Represnts an LRUCache of a fixed maximum size which by default will
24  * remove items based on access order but can be used to use insertion order
25  *
26  * @version $Revision: 426415 $
27  */
28 public class LRUCache extends LinkedHashMap JavaDoc {
29     private static final long serialVersionUID = -5754338187296859149L;
30
31     protected static final int DEFAULT_INITIAL_CAPACITY = 1000;
32     protected static final float DEFAULT_LOAD_FACTOR = (float) 0.75;
33
34     private int maxSize;
35
36     public LRUCache(int initialCapacity, float loadFactor, boolean accessOrder, int maxSize) {
37         super(initialCapacity, loadFactor, accessOrder);
38         this.maxSize = maxSize;
39     }
40
41     public LRUCache(int maxSize) {
42         this(DEFAULT_INITIAL_CAPACITY, DEFAULT_LOAD_FACTOR, true, maxSize);
43     }
44
45     public LRUCache(int maxSize, boolean accessOrder) {
46         this(DEFAULT_INITIAL_CAPACITY, DEFAULT_LOAD_FACTOR, accessOrder, maxSize);
47     }
48
49     protected boolean removeEldestEntry(Map.Entry JavaDoc eldest) {
50         return size() > maxSize;
51     }
52 }
53
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