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.invoke;
  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 
  35 import java.lang.invoke.MethodHandle;
  36 import java.lang.invoke.MethodHandles;
  37 import java.util.concurrent.TimeUnit;
  38 
  39 /**
  40  * Benchmark assesses MethodHandles.identity() performance
  41  */
  42 @BenchmarkMode(Mode.AverageTime)
  43 @OutputTimeUnit(TimeUnit.NANOSECONDS)
  44 @State(Scope.Benchmark)
  45 public class MethodHandlesIdentity {
  46 
  47     private MethodHandle mh;
  48     private Object cachedArg;
  49 
  50     @Setup
  51     public void setup() {
  52         cachedArg = new Object();
  53         mh = MethodHandles.identity(Object.class);
  54     }
  55 
  56     @Benchmark
  57     public Object baselineRaw() throws Throwable {
  58         return new Object();
  59     }
  60 
  61     @Benchmark
  62     public Object baselineRawCached() throws Throwable {
  63         return cachedArg;
  64     }
  65 
  66     @Benchmark
  67     public Object testInvoke() throws Throwable {
  68         return mh.invoke(new Object());
  69     }
  70 
  71     @Benchmark
  72     public Object testInvokeCached() throws Throwable {
  73         return mh.invoke(cachedArg);
  74     }
  75 
  76 }