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 * Tests java.lang.Class.forName() with various inputs. 40 */ 41 @BenchmarkMode(Mode.AverageTime) 42 @OutputTimeUnit(TimeUnit.NANOSECONDS) 43 @State(Scope.Thread) 44 public class ClassForName { 45 46 private String aName, bName, cName; 47 48 @Setup 49 public void setup() { 50 aName = A.class.getName(); 51 bName = B.class.getName(); 52 cName = C.class.getName(); 53 } 54 55 /** Calls Class.forName with the same name over and over again. The class asked for exists. */ 56 @Benchmark 57 public void test1(Blackhole bh) throws ClassNotFoundException { 58 bh.consume(Class.forName(aName)); 59 } 60 61 /** Calls Class.forName with the three different names over and over again. All classes asked for exist. */ 62 @Benchmark 63 public void test3(Blackhole bh) throws ClassNotFoundException { 64 bh.consume(Class.forName(aName)); 65 bh.consume(Class.forName(bName)); 66 bh.consume(Class.forName(cName)); 67 } 68 69 static class A {} 70 static class B {} 71 static class C {} 72 }