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 17 package examples; 18 19 import com.google.caliper.BeforeExperiment; 20 import com.google.caliper.Benchmark; 21 import com.google.caliper.Param; 22 23 import java.util.ArrayList; 24 import java.util.Arrays; 25 import java.util.Collections; 26 import java.util.HashSet; 27 import java.util.List; 28 import java.util.Random; 29 import java.util.Set; 30 31 public class ContainsBenchmark { 32 @Param({"0", "25", "50", "75", "100"}) private int percentNulls; 33 @Param({"100", "1000", "10000"}) private int containsPerRep; 34 35 /** the set under test */ 36 private final Set<String> set = new HashSet<String>(); 37 38 /** twenty-five percent nulls */ 39 private final List<Object> queries = new ArrayList<Object>(); 40 setUp()41 @BeforeExperiment void setUp() { 42 set.addAll(Arrays.asList("str1", "str2", "str3", "str4")); 43 int nullThreshold = percentNulls * containsPerRep / 100; 44 for (int i = 0; i < nullThreshold; i++) { 45 queries.add(null); 46 } 47 for (int i = nullThreshold; i < containsPerRep; i++) { 48 queries.add(new Object()); 49 } 50 Collections.shuffle(queries, new Random(0)); 51 } 52 contains(int reps)53 @Benchmark void contains(int reps) { 54 for (int i = 0; i < reps; i++) { 55 for (Object query : queries) { 56 set.contains(query); 57 } 58 } 59 } 60 } 61