MapCache


1   /**
2    *
3    * Licensed to the Apache Software Foundation (ASF) under one or more
4    * contributor license agreements.  See the NOTICE file distributed with
5    * this work for additional information regarding copyright ownership.
6    * The ASF licenses this file to You under the Apache License, Version 2.0
7    * (the "License"); you may not use this file except in compliance with
8    * 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, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.activemq.memory;
19  
20  import java.util.Map  ;
21  
22  import java.util.concurrent.ConcurrentHashMap  ;
23  
24  /**
25   * Use any Map to implement the Cache.  No cache eviction going on here.  Just gives
26   * a Map a Cache interface.
27   * 
28   * @version $Revision$
29   */
30  public class MapCache implements Cache {
31      
32      protected final Map   map;
33      
34      public MapCache() {
35          this(new ConcurrentHashMap  ());
36      }
37      
38      public MapCache(Map   map) {
39          this.map = map;
40      }
41  
42      public Object   put(Object   key, Object   value) {
43          return map.put(key, value);
44      }
45  
46      public Object   get(Object   key) {
47          return map.get(key);
48      }
49  
50      public Object   remove(Object   key) {
51          return map.remove(key);
52      }
53      
54      public void close() {
55          map.clear();
56      }
57  
58      public int size() {
59          return map.size();
60      }
61  }
62
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