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LruCacheLevelImpl xref 

1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   * http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.chemistry.opencmis.client.bindings.cache.impl;
20  
21  import java.util.LinkedHashMap;
22  import java.util.Map;
23  
24  /**
25   * LRU cache.
26   * 
27   * @author <a href="mailto:fmueller@opentext.com">Florian M&uuml;ller</a>
28   * 
29   */
30  public class LruCacheLevelImpl extends AbstractMapCacheLevel {
31  
32      private static final long serialVersionUID = 1L;
33  
34      public static final String MAX_ENTRIES = "maxEntries";
35  
36      public void initialize(Map<String, String> parameters) {
37          final int maxEntries = getIntParameter(parameters, MAX_ENTRIES, 100);
38  
39          setMap(new LinkedHashMap<String, Object>(maxEntries + 1, 0.70f, true) {
40              private static final long serialVersionUID = 1L;
41  
42              @Override
43              public boolean removeEldestEntry(Map.Entry<String, Object> eldest) {
44                  return size() > maxEntries;
45              }
46          });
47      }
48  }