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
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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  *
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20  * or visit www.oracle.com if you need additional information or have any
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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     @Benchmark
threeSameProtected(Blackhole bh)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
threeDifferentProtected(Blackhole bh)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
threeSamePublic(Blackhole bh)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
threeDifferentPublic(Blackhole bh)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
threeDifferentPublicConstant(Blackhole bh)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
threeDifferentPublicFinal(Blackhole bh)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 }
132