1 /* 2 * Copyright (c) 2014, 2020, 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 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 @SuppressWarnings("deprecation") 64 @Benchmark threeSameProtected(Blackhole bh)65 public void threeSameProtected(Blackhole bh) throws IllegalAccessException, InstantiationException { 66 for (Class<?> cl : sameProtectedClasses) { 67 bh.consume(cl.newInstance()); 68 } 69 } 70 71 /** 72 * Performs Class.newInstance on three different classes, just allocating one instance of one class at a time. The 73 * classes are all protected. 74 */ 75 @SuppressWarnings("deprecation") 76 @Benchmark threeDifferentProtected(Blackhole bh)77 public void threeDifferentProtected(Blackhole bh) throws IllegalAccessException, InstantiationException { 78 for (Class<?> cl : differentProtectedClasses) { 79 bh.consume(cl.newInstance()); 80 } 81 } 82 83 /** 84 * Performs Class.newInstance on the same class over and over again. That it is the same class is not provable at 85 * compile time. The class is public. 86 */ 87 @SuppressWarnings("deprecation") 88 @Benchmark threeSamePublic(Blackhole bh)89 public void threeSamePublic(Blackhole bh) throws IllegalAccessException, InstantiationException { 90 for (Class<?> cl : samePublicClasses) { 91 bh.consume(cl.newInstance()); 92 } 93 } 94 95 /** 96 * Performs Class.newInstance on three different classes, just allocating one instance of one class at a time. The 97 * classes are all public. 98 */ 99 @SuppressWarnings("deprecation") 100 @Benchmark threeDifferentPublic(Blackhole bh)101 public void threeDifferentPublic(Blackhole bh) throws IllegalAccessException, InstantiationException { 102 for (Class<?> cl : differentPublicClasses) { 103 bh.consume(cl.newInstance()); 104 } 105 } 106 107 /** 108 * Performs Class.newInstance on three different classes, just allocating one instance of one class at a time. The 109 * classes are all public. 110 */ 111 @SuppressWarnings("deprecation") 112 @Benchmark threeDifferentPublicConstant(Blackhole bh)113 public void threeDifferentPublicConstant(Blackhole bh) throws IllegalAccessException, InstantiationException { 114 bh.consume(Apub.class.newInstance()); 115 bh.consume(Bpub.class.newInstance()); 116 bh.consume(Cpub.class.newInstance()); 117 } 118 119 @SuppressWarnings("deprecation") 120 @Benchmark threeDifferentPublicFinal(Blackhole bh)121 public void threeDifferentPublicFinal(Blackhole bh) throws IllegalAccessException, InstantiationException { 122 for (Class<?> cl : differentPublicClassesConstant) { 123 bh.consume(cl.newInstance()); 124 } 125 } 126 127 /* Protected test classes */ 128 static class Apro {} 129 static class Bpro {} 130 static class Cpro {} 131 132 /* Public test classes */ 133 public static class Apub {} 134 public static class Bpub {} 135 public static class Cpub {} 136 137 } 138