package org.openjdk.gcbench.runtime.arraycopy;

import org.openjdk.jmh.annotations.*;

import java.util.Arrays;
import java.util.concurrent.TimeUnit;

@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
@Fork(1)
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Threads(1)
@State(Scope.Thread)
public class RefArray {

    public static final int SIZE = 64;

    Object[] sourceNulls, sourceObjs;

    @Setup
    public void setup() {
        sourceNulls = new Object[SIZE];
        sourceObjs = new Object[SIZE];
        for (int c = 0; c < SIZE; c++) {
            sourceObjs[c] = new Object();
        }
    }

    private Object doCopy(Object[] src, int size) {
        Object[] dst = new Object[size];
        System.arraycopy(src, 0, dst, 0, size);
        return dst;
    }

    @Benchmark
    public Object nulls_01() {
        return doCopy(sourceNulls, 1);
    }

    @Benchmark
    public Object nulls_02() {
        return doCopy(sourceNulls, 2);
    }

    @Benchmark
    public Object nulls_04() {
        return doCopy(sourceNulls, 4);
    }

    @Benchmark
    public Object nulls_08() {
        return doCopy(sourceNulls, 8);
    }

    @Benchmark
    public Object nulls_16() {
        return doCopy(sourceNulls, 16);
    }

    @Benchmark
    public Object nulls_32() {
        return doCopy(sourceNulls, 32);
    }

    @Benchmark
    public Object nulls_64() {
        return doCopy(sourceNulls, 64);
    }

    @Benchmark
    public Object objs_01() {
        return doCopy(sourceObjs, 1);
    }

    @Benchmark
    public Object objs_02() {
        return doCopy(sourceObjs, 2);
    }

    @Benchmark
    public Object objs_04() {
        return doCopy(sourceObjs, 4);
    }

    @Benchmark
    public Object objs_08() {
        return doCopy(sourceObjs, 8);
    }

    @Benchmark
    public Object objs_16() {
        return doCopy(sourceObjs, 16);
    }

    @Benchmark
    public Object objs_32() {
        return doCopy(sourceObjs, 32);
    }

    @Benchmark
    public Object objs_64() {
        return doCopy(sourceObjs, 64);
    }

}