1 /*

     2  * Copyright (c) 2015, 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.micro.jdk.java.lang.reflect;

    26 

    27 import java.lang.reflect.Constructor;

    28 import java.lang.reflect.Method;

    29 import java.util.concurrent.TimeUnit;

    30 import org.openjdk.jmh.annotations.Benchmark;

    31 import org.openjdk.jmh.annotations.Fork;

    32 import org.openjdk.jmh.annotations.Measurement;

    33 import org.openjdk.jmh.annotations.OutputTimeUnit;

    34 import org.openjdk.jmh.annotations.Warmup;

    35 

    36 @OutputTimeUnit(TimeUnit.MILLISECONDS)

    37 @Warmup(iterations = 5)

    38 @Measurement(iterations = 5)

    39 @Fork(jvmArgsAppend = {"-Xms1g", "-Xmx1g", "-Xmn768m", "-XX:+UseParallelGC"}, value = 5)

    40 public class GetMethods {

    41 

    42     public static class InternalClass {

    43 

    44         public InternalClass() {

    45         }

    46 

    47         @Override

    48         public String toString() {

    49             return InternalClass.class.getName();

    50         }

    51     }

    52 

    53     /**

    54      * Get the constructor through reflection on a class in the same classloader

    55      *

    56      * @return the constructor

    57      * @throws NoSuchMethodException

    58      */

    59     @Benchmark

    60     public Constructor<InternalClass> getConstructor() throws NoSuchMethodException {

    61         return InternalClass.class.getConstructor();

    62     }

    63 

    64     /**

    65      * Get the constructor through reflection on a class in a different classloader

    66      *

    67      * @return the constructor

    68      * @throws NoSuchMethodException

    69      */

    70     @Benchmark

    71     public Constructor<String> getConstructorDifferentClassLoader() throws NoSuchMethodException {

    72         return String.class.getConstructor();

    73     }

    74 

    75     /**

    76      * Get the toString method through reflection on a class in the same classloader

    77      *

    78      * @return the toString method

    79      * @throws java.lang.NoSuchMethodException

    80      */

    81     @Benchmark

    82     public Method getMethod() throws NoSuchMethodException {

    83         return InternalClass.class.getMethod("toString");

    84     }

    85 

    86     /**

    87      * Get the toString method through reflection on a class in a different classloader

    88      *

    89      * @return the toString method

    90      * @throws NoSuchMethodException

    91      */

    92     @Benchmark

    93     public Method getMethodDifferentClassLoader() throws NoSuchMethodException {

    94         return String.class.getMethod("toString");

    95     }

    96 }