1 /* 2 * Copyright (C) 2012 The Guava Authors 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 17 package com.google.common.cache; 18 19 import com.google.caliper.BeforeExperiment; 20 import com.google.caliper.Benchmark; 21 import com.google.common.base.Function; 22 import com.google.common.base.Functions; 23 import com.google.common.collect.MapMaker; 24 25 import java.util.Map; 26 27 /** 28 * Compare CacheBuilder and MapMaker performance, ensuring that they remain on par with each other. 29 * 30 * @author Nikita Sidorov 31 */ 32 public class MapMakerComparisonBenchmark { 33 private static final String TEST_KEY = "test key"; 34 private static final String TEST_VALUE = "test value"; 35 36 private static final Function<Object, Object> IDENTITY = Functions.identity(); 37 38 // Loading/computing versions: 39 private final Map<Object, Object> computingMap = new MapMaker().makeComputingMap(IDENTITY); 40 private final LoadingCache<Object, Object> loadingCache = 41 CacheBuilder.newBuilder().recordStats().build(CacheLoader.from(IDENTITY)); 42 private final LoadingCache<Object, Object> loadingCacheNoStats = 43 CacheBuilder.newBuilder().build(CacheLoader.from(IDENTITY)); 44 45 // Non-loading versions: 46 private final Map<Object, Object> map = new MapMaker().makeMap(); // Returns ConcurrentHashMap 47 private final Cache<Object, Object> cache = CacheBuilder.newBuilder().recordStats().build(); 48 private final Cache<Object, Object> cacheNoStats = CacheBuilder.newBuilder().build(); 49 50 @BeforeExperiment 51 void setUp() { 52 map.put(TEST_KEY, TEST_VALUE); 53 cache.put(TEST_KEY, TEST_VALUE); 54 cacheNoStats.put(TEST_KEY, TEST_VALUE); 55 } 56 57 @Benchmark void computingMapMaker(int rep) { 58 for (int i = 0; i < rep; i++) { 59 computingMap.get(TEST_KEY); 60 } 61 } 62 63 @Benchmark void loadingCacheBuilder_stats(int rep) { 64 for (int i = 0; i < rep; i++) { 65 loadingCache.getUnchecked(TEST_KEY); 66 } 67 } 68 69 @Benchmark void loadingCacheBuilder(int rep) { 70 for (int i = 0; i < rep; i++) { 71 loadingCacheNoStats.getUnchecked(TEST_KEY); 72 } 73 } 74 75 @Benchmark void concurrentHashMap(int rep) { 76 for (int i = 0; i < rep; i++) { 77 map.get(TEST_KEY); 78 } 79 } 80 81 @Benchmark void cacheBuilder_stats(int rep) { 82 for (int i = 0; i < rep; i++) { 83 cache.getIfPresent(TEST_KEY); 84 } 85 } 86 87 @Benchmark void cacheBuilder(int rep) { 88 for (int i = 0; i < rep; i++) { 89 cacheNoStats.getIfPresent(TEST_KEY); 90 } 91 } 92 } 93
