1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * https://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.jexl3;
18
19 import java.util.Map;
20
21 import org.apache.commons.jexl3.internal.SoftCache;
22
23 import com.googlecode.concurrentlinkedhashmap.ConcurrentLinkedHashMap;
24
25 /**
26 * A cache whose underlying map is a ConcurrentLinkedHashMap.
27 *
28 * @param <K> the cache key entry type
29 * @param <V> the cache key value type
30 */
31 public class ConcurrentCache<K, V> extends SoftCache<K, V> {
32 /**
33 * Creates a new instance of a concurrent cache.
34 *
35 * @param theSize the cache size
36 */
37 public ConcurrentCache(final int theSize) {
38 super(theSize);
39 }
40
41 @Override
42 protected <K, V> Map<K, V> createMap(final int cacheSize) {
43 return new ConcurrentLinkedHashMap.Builder<K, V>()
44 .concurrencyLevel(Runtime.getRuntime().availableProcessors())
45 .maximumWeightedCapacity(cacheSize)
46 .build();
47 }
48 }
49