10888a09821a98ac0680fad765217302858e70fa4Paul Duffin/* 20888a09821a98ac0680fad765217302858e70fa4Paul Duffin * Copyright (C) 2014 The Guava Authors 30888a09821a98ac0680fad765217302858e70fa4Paul Duffin * 40888a09821a98ac0680fad765217302858e70fa4Paul Duffin * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 50888a09821a98ac0680fad765217302858e70fa4Paul Duffin * in compliance with the License. You may obtain a copy of the License at 60888a09821a98ac0680fad765217302858e70fa4Paul Duffin * 70888a09821a98ac0680fad765217302858e70fa4Paul Duffin * http://www.apache.org/licenses/LICENSE-2.0 80888a09821a98ac0680fad765217302858e70fa4Paul Duffin * 90888a09821a98ac0680fad765217302858e70fa4Paul Duffin * Unless required by applicable law or agreed to in writing, software distributed under the License 100888a09821a98ac0680fad765217302858e70fa4Paul Duffin * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express 110888a09821a98ac0680fad765217302858e70fa4Paul Duffin * or implied. See the License for the specific language governing permissions and limitations under 120888a09821a98ac0680fad765217302858e70fa4Paul Duffin * the License. 130888a09821a98ac0680fad765217302858e70fa4Paul Duffin */ 140888a09821a98ac0680fad765217302858e70fa4Paul Duffin 150888a09821a98ac0680fad765217302858e70fa4Paul Duffinpackage com.google.common.collect; 160888a09821a98ac0680fad765217302858e70fa4Paul Duffin 170888a09821a98ac0680fad765217302858e70fa4Paul Duffinimport static com.google.common.base.Preconditions.checkArgument; 180888a09821a98ac0680fad765217302858e70fa4Paul Duffin 190888a09821a98ac0680fad765217302858e70fa4Paul Duffinimport com.google.caliper.BeforeExperiment; 200888a09821a98ac0680fad765217302858e70fa4Paul Duffinimport com.google.caliper.Benchmark; 210888a09821a98ac0680fad765217302858e70fa4Paul Duffinimport com.google.caliper.Param; 220888a09821a98ac0680fad765217302858e70fa4Paul Duffin 230888a09821a98ac0680fad765217302858e70fa4Paul Duffinimport java.util.ArrayList; 240888a09821a98ac0680fad765217302858e70fa4Paul Duffinimport java.util.Collections; 250888a09821a98ac0680fad765217302858e70fa4Paul Duffinimport java.util.LinkedHashSet; 260888a09821a98ac0680fad765217302858e70fa4Paul Duffinimport java.util.List; 270888a09821a98ac0680fad765217302858e70fa4Paul Duffinimport java.util.Random; 280888a09821a98ac0680fad765217302858e70fa4Paul Duffinimport java.util.Set; 290888a09821a98ac0680fad765217302858e70fa4Paul Duffinimport java.util.TreeSet; 300888a09821a98ac0680fad765217302858e70fa4Paul Duffin 310888a09821a98ac0680fad765217302858e70fa4Paul Duffin/** 320888a09821a98ac0680fad765217302858e70fa4Paul Duffin * Provides supporting data for performance notes in the documentation of {@link 330888a09821a98ac0680fad765217302858e70fa4Paul Duffin * Ordering#sortedCopy} and {@link Ordering#immutableSortedCopy}, as well as for 340888a09821a98ac0680fad765217302858e70fa4Paul Duffin * automated code suggestions. 350888a09821a98ac0680fad765217302858e70fa4Paul Duffin * 360888a09821a98ac0680fad765217302858e70fa4Paul Duffin */ 370888a09821a98ac0680fad765217302858e70fa4Paul Duffinpublic class SortedCopyBenchmark { 380888a09821a98ac0680fad765217302858e70fa4Paul Duffin @Param({"1", "10", "1000", "1000000"}) int size; // logarithmic triangular 390888a09821a98ac0680fad765217302858e70fa4Paul Duffin 400888a09821a98ac0680fad765217302858e70fa4Paul Duffin @Param boolean mutable; 410888a09821a98ac0680fad765217302858e70fa4Paul Duffin 420888a09821a98ac0680fad765217302858e70fa4Paul Duffin @Param InputOrder inputOrder; 430888a09821a98ac0680fad765217302858e70fa4Paul Duffin 440888a09821a98ac0680fad765217302858e70fa4Paul Duffin enum InputOrder { 450888a09821a98ac0680fad765217302858e70fa4Paul Duffin SORTED { 460888a09821a98ac0680fad765217302858e70fa4Paul Duffin @Override void arrange(List<Integer> list) { 470888a09821a98ac0680fad765217302858e70fa4Paul Duffin Collections.sort(list); 480888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 490888a09821a98ac0680fad765217302858e70fa4Paul Duffin }, 500888a09821a98ac0680fad765217302858e70fa4Paul Duffin ALMOST_SORTED { 510888a09821a98ac0680fad765217302858e70fa4Paul Duffin @Override void arrange(List<Integer> list) { 520888a09821a98ac0680fad765217302858e70fa4Paul Duffin Collections.sort(list); 530888a09821a98ac0680fad765217302858e70fa4Paul Duffin if (list.size() > 1) { 540888a09821a98ac0680fad765217302858e70fa4Paul Duffin int i = (list.size() - 1) / 2; 550888a09821a98ac0680fad765217302858e70fa4Paul Duffin Collections.swap(list, i, i + 1); 560888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 570888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 580888a09821a98ac0680fad765217302858e70fa4Paul Duffin }, 590888a09821a98ac0680fad765217302858e70fa4Paul Duffin RANDOM { 600888a09821a98ac0680fad765217302858e70fa4Paul Duffin @Override void arrange(List<Integer> list) {} 610888a09821a98ac0680fad765217302858e70fa4Paul Duffin }; 620888a09821a98ac0680fad765217302858e70fa4Paul Duffin 630888a09821a98ac0680fad765217302858e70fa4Paul Duffin abstract void arrange(List<Integer> list); 640888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 650888a09821a98ac0680fad765217302858e70fa4Paul Duffin 660888a09821a98ac0680fad765217302858e70fa4Paul Duffin private ImmutableList<Integer> input; 670888a09821a98ac0680fad765217302858e70fa4Paul Duffin 680888a09821a98ac0680fad765217302858e70fa4Paul Duffin @BeforeExperiment 690888a09821a98ac0680fad765217302858e70fa4Paul Duffin void setUp() { 700888a09821a98ac0680fad765217302858e70fa4Paul Duffin checkArgument(size > 0, "empty collection not supported"); 710888a09821a98ac0680fad765217302858e70fa4Paul Duffin Set<Integer> set = new LinkedHashSet<Integer>(size); 720888a09821a98ac0680fad765217302858e70fa4Paul Duffin 730888a09821a98ac0680fad765217302858e70fa4Paul Duffin Random random = new Random(); 740888a09821a98ac0680fad765217302858e70fa4Paul Duffin while (set.size() < size) { 750888a09821a98ac0680fad765217302858e70fa4Paul Duffin set.add(random.nextInt()); 760888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 770888a09821a98ac0680fad765217302858e70fa4Paul Duffin List<Integer> list = new ArrayList<Integer>(set); 780888a09821a98ac0680fad765217302858e70fa4Paul Duffin inputOrder.arrange(list); 790888a09821a98ac0680fad765217302858e70fa4Paul Duffin input = ImmutableList.copyOf(list); 800888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 810888a09821a98ac0680fad765217302858e70fa4Paul Duffin 820888a09821a98ac0680fad765217302858e70fa4Paul Duffin @Benchmark 830888a09821a98ac0680fad765217302858e70fa4Paul Duffin int collections(int reps) { 840888a09821a98ac0680fad765217302858e70fa4Paul Duffin int dummy = 0; 850888a09821a98ac0680fad765217302858e70fa4Paul Duffin // Yes, this could be done more elegantly 860888a09821a98ac0680fad765217302858e70fa4Paul Duffin if (mutable) { 870888a09821a98ac0680fad765217302858e70fa4Paul Duffin for (int i = 0; i < reps; i++) { 880888a09821a98ac0680fad765217302858e70fa4Paul Duffin List<Integer> copy = new ArrayList<Integer>(input); 890888a09821a98ac0680fad765217302858e70fa4Paul Duffin Collections.sort(copy); 900888a09821a98ac0680fad765217302858e70fa4Paul Duffin dummy += copy.get(0); 910888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 920888a09821a98ac0680fad765217302858e70fa4Paul Duffin } else { 930888a09821a98ac0680fad765217302858e70fa4Paul Duffin for (int i = 0; i < reps; i++) { 940888a09821a98ac0680fad765217302858e70fa4Paul Duffin List<Integer> copy = new ArrayList<Integer>(input); 950888a09821a98ac0680fad765217302858e70fa4Paul Duffin Collections.sort(copy); 960888a09821a98ac0680fad765217302858e70fa4Paul Duffin dummy += ImmutableList.copyOf(copy).get(0); 970888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 980888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 990888a09821a98ac0680fad765217302858e70fa4Paul Duffin return dummy; 1000888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 1010888a09821a98ac0680fad765217302858e70fa4Paul Duffin 1020888a09821a98ac0680fad765217302858e70fa4Paul Duffin @Benchmark 1030888a09821a98ac0680fad765217302858e70fa4Paul Duffin int ordering(int reps) { 1040888a09821a98ac0680fad765217302858e70fa4Paul Duffin int dummy = 0; 1050888a09821a98ac0680fad765217302858e70fa4Paul Duffin if (mutable) { 1060888a09821a98ac0680fad765217302858e70fa4Paul Duffin for (int i = 0; i < reps; i++) { 1070888a09821a98ac0680fad765217302858e70fa4Paul Duffin dummy += ORDERING.sortedCopy(input).get(0); 1080888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 1090888a09821a98ac0680fad765217302858e70fa4Paul Duffin } else { 1100888a09821a98ac0680fad765217302858e70fa4Paul Duffin for (int i = 0; i < reps; i++) { 1110888a09821a98ac0680fad765217302858e70fa4Paul Duffin dummy += ORDERING.immutableSortedCopy(input).get(0); 1120888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 1130888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 1140888a09821a98ac0680fad765217302858e70fa4Paul Duffin return dummy; 1150888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 1160888a09821a98ac0680fad765217302858e70fa4Paul Duffin 1170888a09821a98ac0680fad765217302858e70fa4Paul Duffin @Benchmark 1180888a09821a98ac0680fad765217302858e70fa4Paul Duffin int sortedSet(int reps) { 1190888a09821a98ac0680fad765217302858e70fa4Paul Duffin int dummy = 0; 1200888a09821a98ac0680fad765217302858e70fa4Paul Duffin if (mutable) { 1210888a09821a98ac0680fad765217302858e70fa4Paul Duffin for (int i = 0; i < reps; i++) { 1220888a09821a98ac0680fad765217302858e70fa4Paul Duffin dummy += new TreeSet<Integer>(input).first(); 1230888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 1240888a09821a98ac0680fad765217302858e70fa4Paul Duffin } else { 1250888a09821a98ac0680fad765217302858e70fa4Paul Duffin for (int i = 0; i < reps; i++) { 1260888a09821a98ac0680fad765217302858e70fa4Paul Duffin dummy += ImmutableSortedSet.copyOf(input).first(); 1270888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 1280888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 1290888a09821a98ac0680fad765217302858e70fa4Paul Duffin return dummy; 1300888a09821a98ac0680fad765217302858e70fa4Paul Duffin } 1310888a09821a98ac0680fad765217302858e70fa4Paul Duffin 1320888a09821a98ac0680fad765217302858e70fa4Paul Duffin private static final Ordering<Integer> ORDERING = Ordering.natural(); 1330888a09821a98ac0680fad765217302858e70fa4Paul Duffin} 134