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 }