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. 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 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.openjdk.bench.java.lang.invoke; 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 33 import java.lang.invoke.MethodHandle; 34 import java.lang.invoke.MethodHandles; 35 import java.util.concurrent.TimeUnit; 36 37 /** 38 * Benchmark assesses MethodHandles.identity() performance 39 */ 40 @BenchmarkMode(Mode.AverageTime) 41 @OutputTimeUnit(TimeUnit.NANOSECONDS) 42 @State(Scope.Benchmark) 43 public class MethodHandlesIdentity { 44 45 private MethodHandle mh; 46 private Object cachedArg; 47 48 @Setup 49 public void setup() { 50 cachedArg = new Object(); 51 mh = MethodHandles.identity(Object.class); 52 } 53 54 @Benchmark 55 public Object baselineRaw() throws Throwable { 56 return new Object(); 57 } 58 59 @Benchmark 60 public Object baselineRawCached() throws Throwable { 61 return cachedArg; 62 } 63 64 @Benchmark 65 public Object testInvoke() throws Throwable { 66 return mh.invoke(new Object()); 67 } 68 69 @Benchmark 70 public Object testInvokeCached() throws Throwable { 71 return mh.invoke(cachedArg); 72 } 73 74 }