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.concurrent.ConcurrentHashMap;
22 import java.util.function.Supplier;
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 ConcurrentHashMap<Object, Object> cache = new ConcurrentHashMap<>(256);
31
32 /**
33 * Creates a new cache instance.
34 */
35 public DefaultRepositoryCache() {}
36
37 public Object get(RepositorySystemSession session, Object key) {
38 return cache.get(key);
39 }
40
41 public void put(RepositorySystemSession session, Object key, Object data) {
42 if (data != null) {
43 cache.put(key, data);
44 } else {
45 cache.remove(key);
46 }
47 }
48
49 @Override
50 public Object computeIfAbsent(RepositorySystemSession session, Object key, Supplier<Object> supplier) {
51 return cache.computeIfAbsent(key, k -> supplier.get());
52 }
53 }