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package benchmark;

import com.google.common.collect.ImmutableList;

import graphql.collect.ImmutableKit;

import org.openjdk.jmh.annotations.Benchmark;

import org.openjdk.jmh.annotations.BenchmarkMode;

import org.openjdk.jmh.annotations.Measurement;

import org.openjdk.jmh.annotations.Mode;

import org.openjdk.jmh.annotations.Scope;

import org.openjdk.jmh.annotations.State;

import org.openjdk.jmh.annotations.Warmup;

import org.openjdk.jmh.infra.Blackhole;

import java.util.ArrayList;

import java.util.List;

import java.util.concurrent.TimeUnit;

import java.util.function.Function;

import java.util.stream.Collectors;

@State(Scope.Benchmark)

@BenchmarkMode(Mode.Throughput)

@Warmup(iterations = 2)

@Measurement(iterations = 2, timeUnit = TimeUnit.NANOSECONDS)

public class ListBenchmark {

static final List<String> startingList = buildStartingList();

private static List<String> buildStartingList() {

List<String> list = new ArrayList<>();

for (int i = 0; i < 10000; i++) {

list.add("String" + i);

}

return list;

}

private final Function<String, String> mapper = s -> new StringBuilder(s).reverse().toString();

@Benchmark

public void benchmarkListStream(Blackhole blackhole) {

List<String> output = startingList.stream().map(mapper).collect(Collectors.toList());

blackhole.consume(output);

}

@Benchmark

public void benchmarkImmutableListBuilder(Blackhole blackhole) {

List<String> output = ImmutableKit.map(startingList, mapper);

blackhole.consume(output);

}

@Benchmark

public void benchmarkArrayList(Blackhole blackhole) {

List<String> output = new ArrayList<>(startingList.size());

for (String s : startingList) {

output.add(mapper.apply(s));

}

blackhole.consume(output);

}

@Benchmark

public void benchmarkImmutableCollectorBuilder(Blackhole blackhole) {

List<String> output = startingList.stream().map(mapper).collect(ImmutableList.toImmutableList());

blackhole.consume(output);

}

}