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1   package org.eclipse.aether;
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.Map;
23  import java.util.concurrent.ConcurrentHashMap;
24  
25  /**
26   * A simplistic repository cache backed by a thread-safe map. The simplistic nature of this cache makes it only suitable
27   * for use with short-lived repository system sessions where pruning of cache data is not required.
28   */
29  public final class DefaultRepositoryCache
30      implements RepositoryCache
31  {
32  
33      private final Map<Object, Object> cache = new ConcurrentHashMap<Object, Object>( 256 );
34  
35      public Object get( RepositorySystemSession session, Object key )
36      {
37          return cache.get( key );
38      }
39  
40      public void put( RepositorySystemSession session, Object key, Object data )
41      {
42          if ( data != null )
43          {
44              cache.put( key, data );
45          }
46          else
47          {
48              cache.remove( key );
49          }
50      }
51  
52  }