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 * 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.vm.lambda.capture;

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 java.util.Comparator;
import java.util.concurrent.TimeUnit;

/**
 * measure lambda capture
 *
 * @author Sergey Kuksenko (sergey.kuksenko@oracle.com)
 */
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
public class Capture2 {

    public static class StaticInner implements Comparator<Integer> {
        @Override
        public int compare(Integer x, Integer y) {
            return (x < y) ? -1 : ((x > y) ? 1 : 0);
        }
    }

    public class InstanceInner implements Comparator<Integer> {
        @Override
        public int compare(Integer x, Integer y) {
            return (x < y) ? -1 : ((x > y) ? 1 : 0);
        }
    }


    @Benchmark()
    public Comparator<Integer> anonymous(){
        return new Comparator<Integer>() {
            @Override
            public int compare(Integer x, Integer y) {
                return (x < y) ? -1 : ((x > y) ? 1 : 0);
            }
        };
    }

    @Benchmark()
    public Comparator<Integer> inner(){
        return new InstanceInner();
    }

    @Benchmark()
    public Comparator<Integer> inner_static(){
        return new StaticInner();
    }

    @Benchmark()
    public Comparator<Integer> lambda(){
        return (x, y) -> (x < y) ? -1 : ((x > y) ? 1 : 0);
    }

    public Comparator<Integer> mref_static(){
        return Integer::compare;
    }

    @Benchmark()
    public Comparator<Integer> mref_unbound(){
        return Integer::compareTo;
    }

    @Benchmark()
    public Comparator<Integer> mref_bound(){
        return this::compareInteger;
    }

    public int compareInteger(Integer x, Integer y) {
        return (x < y) ? -1 : ((x > y) ? 1 : 0);
    }


}
