1 /* 2 * Copyright (c) 2014 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 package org.openjdk.bench.java.lang; 24 25 import org.openjdk.jmh.annotations.Benchmark; 26 import org.openjdk.jmh.annotations.BenchmarkMode; 27 import org.openjdk.jmh.annotations.Mode; 28 import org.openjdk.jmh.annotations.OutputTimeUnit; 29 import org.openjdk.jmh.annotations.Scope; 30 import org.openjdk.jmh.annotations.Setup; 31 import org.openjdk.jmh.annotations.State; 32 import org.openjdk.jmh.infra.Blackhole; 33 34 import java.util.concurrent.TimeUnit; 35 36 /** 37 * Benchmark measuring java.lang.Class.newInstance speed. 38 */ 39 @BenchmarkMode(Mode.AverageTime) 40 @OutputTimeUnit(TimeUnit.NANOSECONDS) 41 @State(Scope.Thread) 42 public class NewInstance { 43 44 public Class<?>[] samePublicClasses; 45 public Class<?>[] differentPublicClasses; 46 public Class<?>[] differentPublicClassesConstant; 47 public Class<?>[] sameProtectedClasses; 48 public Class<?>[] differentProtectedClasses; 49 50 @Setup 51 public void setup() { 52 samePublicClasses = new Class<?>[]{Apub.class, Apub.class, Apub.class}; 53 differentPublicClasses = new Class<?>[]{Apub.class, Bpub.class, Cpub.class}; 54 differentPublicClassesConstant = new Class<?>[]{Apub.class, Bpub.class, Cpub.class}; 55 sameProtectedClasses = new Class<?>[]{Apro.class, Apro.class, Apro.class}; 56 differentProtectedClasses = new Class<?>[]{Apro.class, Bpro.class, Cpro.class}; 57 } 58 59 /** 60 * Performs Class.newInstance on the same class over and over again. That it is the same class is not provable at 61 * compile time. The class is protected. 62 */ 63 @Benchmark 64 public void threeSameProtected(Blackhole bh) throws IllegalAccessException, InstantiationException { 65 for (Class<?> cl : sameProtectedClasses) { 66 bh.consume(cl.newInstance()); 67 } 68 } 69 70 /** 71 * Performs Class.newInstance on three different classes, just allocating one instance of one class at a time. The 72 * classes are all protected. 73 */ 74 @Benchmark 75 public void threeDifferentProtected(Blackhole bh) throws IllegalAccessException, InstantiationException { 76 for (Class<?> cl : differentProtectedClasses) { 77 bh.consume(cl.newInstance()); 78 } 79 } 80 81 /** 82 * Performs Class.newInstance on the same class over and over again. That it is the same class is not provable at 83 * compile time. The class is public. 84 */ 85 @Benchmark 86 public void threeSamePublic(Blackhole bh) throws IllegalAccessException, InstantiationException { 87 for (Class<?> cl : samePublicClasses) { 88 bh.consume(cl.newInstance()); 89 } 90 } 91 92 /** 93 * Performs Class.newInstance on three different classes, just allocating one instance of one class at a time. The 94 * classes are all public. 95 */ 96 @Benchmark 97 public void threeDifferentPublic(Blackhole bh) throws IllegalAccessException, InstantiationException { 98 for (Class<?> cl : differentPublicClasses) { 99 bh.consume(cl.newInstance()); 100 } 101 } 102 103 /** 104 * Performs Class.newInstance on three different classes, just allocating one instance of one class at a time. The 105 * classes are all public. 106 */ 107 @Benchmark 108 public void threeDifferentPublicConstant(Blackhole bh) throws IllegalAccessException, InstantiationException { 109 bh.consume(Apub.class.newInstance()); 110 bh.consume(Bpub.class.newInstance()); 111 bh.consume(Cpub.class.newInstance()); 112 } 113 114 @Benchmark 115 public void threeDifferentPublicFinal(Blackhole bh) throws IllegalAccessException, InstantiationException { 116 for (Class<?> cl : differentPublicClassesConstant) { 117 bh.consume(cl.newInstance()); 118 } 119 } 120 121 /* Protected test classes */ 122 static class Apro {} 123 static class Bpro {} 124 static class Cpro {} 125 126 /* Public test classes */ 127 public static class Apub {} 128 public static class Bpub {} 129 public static class Cpub {} 130 131 }