package com.baeldung;

import com.google.common.hash.Hasher;
import com.google.common.hash.Hashing;
import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.infra.Blackhole;

import java.nio.charset.Charset;
import java.util.concurrent.TimeUnit;

public class BenchMark {

    @State(Scope.Benchmark)
    public static class Log {
        public int x = 8;
    }

    @State(Scope.Benchmark)
    public static class ExecutionPlan {

        @Param({ "100", "200", "300", "500", "1000" })
        public int iterations;

        public Hasher murmur3;

        public String password = "4v3rys3kur3p455w0rd";

        @Setup(Level.Invocation)
        public void setUp() {
            murmur3 = Hashing.murmur3_128().newHasher();
        }
    }

    @Fork(value = 1, warmups = 1)
    @Benchmark
    @BenchmarkMode(Mode.Throughput)
    @Warmup(iterations = 5)
    public void benchMurmur3_128(ExecutionPlan plan) {

        for (int i = plan.iterations; i > 0; i--) {
            plan.murmur3.putString(plan.password, Charset.defaultCharset());
        }

        plan.murmur3.hash();
    }

    @Benchmark
    @Fork(value = 1, warmups = 1)
    @BenchmarkMode(Mode.Throughput)
    public void init() {
        // Do nothing
    }

    @Benchmark
    @OutputTimeUnit(TimeUnit.NANOSECONDS)
    @BenchmarkMode(Mode.AverageTime)
    public void doNothing() {

    }

    @Benchmark
    @OutputTimeUnit(TimeUnit.NANOSECONDS)
    @BenchmarkMode(Mode.AverageTime)
    public void objectCreation() {
        new Object();
    }

    @Benchmark
    @OutputTimeUnit(TimeUnit.NANOSECONDS)
    @BenchmarkMode(Mode.AverageTime)
    public Object pillarsOfCreation() {
        return new Object();
    }

    @Benchmark
    @OutputTimeUnit(TimeUnit.NANOSECONDS)
    @BenchmarkMode(Mode.AverageTime)
    public void blackHole(Blackhole blackhole) {
        blackhole.consume(new Object());
    }

    @Benchmark
    public double foldedLog() {
        int x = 8;

        return Math.log(x);
    }

    @Benchmark
    public double log(Log input) {
        return Math.log(input.x);
    }

}