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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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13  * accompanied this code).
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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