1 /*
2 * JBoss, Home of Professional Open Source.
3 * Copyright 2014 Red Hat, Inc., and individual contributors
4 * as indicated by the @author tags.
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * 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
19 package io.undertow.server.protocol.http;
20
21 import java.util.LinkedHashMap;
22 import java.util.Map;
23
24 /**
25 * @author Stuart Douglas
26 */
27 public class CacheMap<K, V> extends LinkedHashMap<K, V> {
28 /**
29 * The load factor used when none specified in constructor.
30 */
31 static final float DEFAULT_LOAD_FACTOR = 0.75f;
32 private static final long serialVersionUID = 1L;
33 private int capacity;
34
35 public CacheMap(int capacity) {
36 super(capacity, DEFAULT_LOAD_FACTOR, true);
37 this.capacity = capacity;
38 }
39
40 /**
41 * removeEldestEntry() should be overridden by the user, otherwise it will not
42 * remove the oldest object from the Map.
43 */
44 @Override
45 protected boolean removeEldestEntry(Map.Entry<K, V> eldest) {
46 return size() > this.capacity;
47 }
48 }
49