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package org.openjdk.bench.java.util;

import java.util.Random;
import java.util.concurrent.TimeUnit;
import java.util.zip.CRC32C;
import org.openjdk.jmh.annotations.*;

@BenchmarkMode(Mode.Throughput)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@State(Scope.Thread)
@Warmup(iterations = 4, time = 2)
@Measurement(iterations = 4, time = 2)
@Fork(value = 3)
public class TestCRC32C {

    private CRC32C crc32c;
    private Random random;
    private byte[] bytes;

    @Param({"64", "128", "256", "512", /* "1024", */ "2048", /* "4096", "8192", */ "16384", /* "32768", */ "65536"})
    private int count;

    public TestCRC32C() {
        crc32c = new CRC32C();
        random = new Random(2147483648L);
        bytes = new byte[1000000];
        random.nextBytes(bytes);
    }

    @Setup(Level.Iteration)
    public void setupBytes() {
        crc32c.reset();
    }

    @Benchmark
    public void testCRC32CUpdate() {
        crc32c.update(bytes, 0, count);
    }
}