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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package org.openjdk.bench.java.lang;
  26 
  27 import org.openjdk.jmh.annotations.Benchmark;
  28 import org.openjdk.jmh.annotations.BenchmarkMode;
  29 import org.openjdk.jmh.annotations.Mode;
  30 import org.openjdk.jmh.annotations.OutputTimeUnit;
  31 import org.openjdk.jmh.annotations.Scope;
  32 import org.openjdk.jmh.annotations.Setup;
  33 import org.openjdk.jmh.annotations.State;
  34 import org.openjdk.jmh.infra.Blackhole;
  35 
  36 import java.util.concurrent.TimeUnit;
  37 
  38 /**
  39  * Benchmark measuring java.lang.Class.newInstance speed.
  40  */
  41 @BenchmarkMode(Mode.AverageTime)
  42 @OutputTimeUnit(TimeUnit.NANOSECONDS)
  43 @State(Scope.Thread)
  44 public class NewInstance {
  45 
  46     public Class<?>[] samePublicClasses;
  47     public Class<?>[] differentPublicClasses;
  48     public Class<?>[] differentPublicClassesConstant;
  49     public Class<?>[] sameProtectedClasses;
  50     public Class<?>[] differentProtectedClasses;
  51 
  52     @Setup
  53     public void setup() {
  54         samePublicClasses = new Class<?>[]{Apub.class, Apub.class, Apub.class};
  55         differentPublicClasses = new Class<?>[]{Apub.class, Bpub.class, Cpub.class};
  56         differentPublicClassesConstant = new Class<?>[]{Apub.class, Bpub.class, Cpub.class};
  57         sameProtectedClasses = new Class<?>[]{Apro.class, Apro.class, Apro.class};
  58         differentProtectedClasses = new Class<?>[]{Apro.class, Bpro.class, Cpro.class};
  59     }
  60 
  61     /**
  62      * Performs Class.newInstance on the same class over and over again. That it is the same class is not provable at
  63      * compile time. The class is protected.
  64      */
  65     @Benchmark
  66     public void threeSameProtected(Blackhole bh) throws IllegalAccessException, InstantiationException {
  67         for (Class<?> cl : sameProtectedClasses) {
  68             bh.consume(cl.newInstance());
  69         }
  70     }
  71 
  72     /**
  73      * Performs Class.newInstance on three different classes, just allocating one instance of one class at a time. The
  74      * classes are all protected.
  75      */
  76     @Benchmark
  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     @Benchmark
  88     public void threeSamePublic(Blackhole bh) throws IllegalAccessException, InstantiationException {
  89         for (Class<?> cl : samePublicClasses) {
  90             bh.consume(cl.newInstance());
  91         }
  92     }
  93 
  94     /**
  95      * Performs Class.newInstance on three different classes, just allocating one instance of one class at a time. The
  96      * classes are all public.
  97      */
  98     @Benchmark
  99     public void threeDifferentPublic(Blackhole bh) throws IllegalAccessException, InstantiationException {
 100         for (Class<?> cl : differentPublicClasses) {
 101             bh.consume(cl.newInstance());
 102         }
 103     }
 104 
 105     /**
 106      * Performs Class.newInstance on three different classes, just allocating one instance of one class at a time. The
 107      * classes are all public.
 108      */
 109     @Benchmark
 110     public void threeDifferentPublicConstant(Blackhole bh) throws IllegalAccessException, InstantiationException {
 111         bh.consume(Apub.class.newInstance());
 112         bh.consume(Bpub.class.newInstance());
 113         bh.consume(Cpub.class.newInstance());
 114     }
 115 
 116     @Benchmark
 117     public void threeDifferentPublicFinal(Blackhole bh) throws IllegalAccessException, InstantiationException {
 118         for (Class<?> cl : differentPublicClassesConstant) {
 119             bh.consume(cl.newInstance());
 120         }
 121     }
 122 
 123     /* Protected test classes */
 124     static class Apro {}
 125     static class Bpro {}
 126     static class Cpro {}
 127 
 128     /* Public test classes */
 129     public static class Apub {}
 130     public static class Bpub {}
 131     public static class Cpub {}
 132 
 133 }