1 /*
   2  * Copyright (c) 2017, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 package micro.benchmarks;
  26 
  27 import java.util.concurrent.TimeUnit;
  28 
  29 import org.openjdk.jmh.annotations.Benchmark;
  30 import org.openjdk.jmh.annotations.OutputTimeUnit;
  31 import org.openjdk.jmh.annotations.Scope;
  32 import org.openjdk.jmh.annotations.State;
  33 import org.openjdk.jmh.annotations.Warmup;
  34 
  35 /**
  36  * Benchmarks cost of {@link String#indexOf(int)} and {@link String#indexOf(String)}.
  37  */
  38 @OutputTimeUnit(TimeUnit.MILLISECONDS)
  39 public class StringBenchmark extends BenchmarkBase {
  40 
  41     @State(Scope.Benchmark)
  42     public static class BenchState {
  43         char ch1 = 'Q';
  44         String ch1string = "Q";
  45         char ch2 = 'X';
  46         String s1 = "Qu";
  47         String s2 = "ne";
  48 
  49         String longString;
  50 
  51         public BenchState() {
  52             String str = "ab";
  53             for (int i = 0; i < 15; i++) {
  54                 str = str + str;
  55             }
  56             longString = str + "xx";
  57         }
  58 
  59         // Checkstyle: stop
  60         String lorem = "Lorem ipsum dolor sit amet, consectetur adipisici elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat. Quis aute iure reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint obcaecat cupiditat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.";
  61         String loremLastChar = "Lorem ipsum dolor sit amet, consectetur adipisici elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat. Quis aute iure reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint obcaecat cupiditat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum?";
  62         // Checkstyle: resume
  63 
  64         String smallLorem = lorem.substring(0, 13);
  65         String largeLorem = lorem.concat(lorem);
  66 
  67         char[] smallCharArray = lorem.substring(0, 13).toCharArray();
  68         char[] largeCharArray = lorem.concat(lorem).toCharArray();
  69     }
  70 
  71     @Benchmark
  72     @Warmup(iterations = 5)
  73     public int indexOfChar(BenchState state) {
  74         return state.lorem.indexOf(state.ch1);
  75     }
  76 
  77     @Benchmark
  78     @Warmup(iterations = 5)
  79     public int indexOfSingleCharString(BenchState state) {
  80         return state.lorem.indexOf(state.ch1string);
  81     }
  82 
  83     @Benchmark
  84     @Warmup(iterations = 5)
  85     public int indexOfSingleCharStringLong(BenchState state) {
  86         return state.longString.indexOf('x');
  87     }
  88 
  89     @Benchmark
  90     @Warmup(iterations = 5)
  91     public int indexOfCharNotFound(BenchState state) {
  92         return state.lorem.indexOf(state.ch2);
  93     }
  94 
  95     @Benchmark
  96     @Warmup(iterations = 5)
  97     public int indexOfString(BenchState state) {
  98         return state.lorem.indexOf(state.s1);
  99     }
 100 
 101     @Benchmark
 102     @Warmup(iterations = 5)
 103     public int indexOfStringNotFound(BenchState state) {
 104         return state.lorem.indexOf(state.s2);
 105     }
 106 
 107     @Benchmark
 108     @Warmup(iterations = 5)
 109     public int compareTo(BenchState state) {
 110         return state.lorem.compareTo(state.loremLastChar);
 111     }
 112 
 113     @Benchmark
 114     @Warmup(iterations = 5)
 115     public String compressSmallString(BenchState state) {
 116         return new String(state.smallCharArray);
 117     }
 118 
 119     @Benchmark
 120     @Warmup(iterations = 5)
 121     public String compressLargeString(BenchState state) {
 122         return new String(state.largeCharArray);
 123     }
 124 
 125     @Benchmark
 126     @Warmup(iterations = 5)
 127     public char[] inflateSmallString(BenchState state) {
 128         return state.smallLorem.toCharArray();
 129     }
 130 
 131     @Benchmark
 132     @Warmup(iterations = 5)
 133     public char[] inflateLargeString(BenchState state) {
 134         return state.largeLorem.toCharArray();
 135     }
 136 }