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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.eclipse.aether;
20  
21  import java.util.Map;
22  import java.util.concurrent.ConcurrentHashMap;
23  
24  /**
25   * A simplistic repository cache backed by a thread-safe map. The simplistic nature of this cache makes it only suitable
26   * for use with short-lived repository system sessions where pruning of cache data is not required.
27   */
28  public final class DefaultRepositoryCache implements RepositoryCache {
29  
30      private final Map<Object, Object> cache = new ConcurrentHashMap<>(256);
31  
32      public Object get(RepositorySystemSession session, Object key) {
33          return cache.get(key);
34      }
35  
36      public void put(RepositorySystemSession session, Object key, Object data) {
37          if (data != null) {
38              cache.put(key, data);
39          } else {
40              cache.remove(key);
41          }
42      }
43  }