Clone.java

/*
 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package org.openjdk.bench.java.lang;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.infra.Blackhole;

import java.util.BitSet;
import java.util.Date;
import java.util.concurrent.TimeUnit;

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Thread)
public class Clone {

    private BitSet testObj1;
    private Date testObj2;
    private char[] testObj3;
    private char[] testObj4;
    private String[] testObj5;

    @Setup
    public void setup() {
        testObj1 = new BitSet(10);
        testObj2 = new Date();
        testObj3 = new char[5];
        testObj4 = new char[311];
        String str = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut";
        testObj5 = str.split(" ", -1);
    }

    /** Calls clone on three different types. The types are java.util.BitSet, java.util.Date and char[]. */
    @Benchmark
    public void cloneThreeDifferent(Blackhole bh) {
        bh.consume(testObj1.clone());
        bh.consume(testObj2.clone());
        bh.consume(testObj3.clone());
    }

    @Benchmark
    public void cloneLarge(Blackhole bh) {
        bh.consume(testObj4.clone());
        bh.consume(testObj5.clone());
    }

}