1/*
2 * Copyright (C) 2010 Google Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package benchmarks;
18
19import java.util.HashMap;
20import java.util.Hashtable;
21import java.util.LinkedHashMap;
22import java.util.concurrent.ConcurrentHashMap;
23
24/**
25 * How do the various hash maps compare?
26 */
27public class HashedCollectionsBenchmark {
28    public void timeHashMapGet(int reps) {
29        HashMap<String, String> map = new HashMap<String, String>();
30        map.put("hello", "world");
31        for (int i = 0; i < reps; ++i) {
32            map.get("hello");
33        }
34    }
35    public void timeHashMapGet_Synchronized(int reps) {
36        HashMap<String, String> map = new HashMap<String, String>();
37        synchronized (map) {
38            map.put("hello", "world");
39        }
40        for (int i = 0; i < reps; ++i) {
41            synchronized (map) {
42                map.get("hello");
43            }
44        }
45    }
46    public void timeHashtableGet(int reps) {
47        Hashtable<String, String> map = new Hashtable<String, String>();
48        map.put("hello", "world");
49        for (int i = 0; i < reps; ++i) {
50            map.get("hello");
51        }
52    }
53    public void timeLinkedHashMapGet(int reps) {
54        LinkedHashMap<String, String> map = new LinkedHashMap<String, String>();
55        map.put("hello", "world");
56        for (int i = 0; i < reps; ++i) {
57            map.get("hello");
58        }
59    }
60    public void timeConcurrentHashMapGet(int reps) {
61        ConcurrentHashMap<String, String> map = new ConcurrentHashMap<String, String>();
62        map.put("hello", "world");
63        for (int i = 0; i < reps; ++i) {
64            map.get("hello");
65        }
66    }
67}
68