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Graal.js JMH Interop Suite
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package com.oracle.truffle.js.jmh;

import java.util.Random;
import java.util.stream.IntStream;

import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.Source;
import org.graalvm.polyglot.Value;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.TearDown;
import org.openjdk.jmh.annotations.Warmup;

@Warmup(iterations = 5)
@Measurement(iterations = 5)
@Fork(2)
public class JMHJsObjectInteropBenchmark {
    @State(Scope.Thread)
    public static class MyState {
        protected static final int MIN_PROPERTY_KEY_LENGTH = 3;
        protected static final int MAX_PROPERTY_KEY_LENGTH = 10;
        protected static final int MIN_PROPERTY_VALUE_LENGTH = 3;
        protected static final int MAX_PROPERTY_VALUE_LENGTH = 50;
        protected static final int PROPERTIES_COUNT = 10;
        protected static final Character[] ALLOWED_CHARS = IntStream.range(0, 256).filter(i -> Character.isAlphabetic(i) || Character.isDigit(i)).mapToObj(i -> (char) i).toArray(Character[]::new);

        String generateString(int length) {
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < length; i++) {
                sb.append(ALLOWED_CHARS[rnd.nextInt(ALLOWED_CHARS.length)]);
            }
            return sb.toString();
        }

        Context context;
        Source emptyObjectSource;
        String[] propertyKeys;
        String[] propertyValues;
        Random rnd;

        @Setup(Level.Trial)
        public void doSetup() {
            context = Context.create("js");
            emptyObjectSource = Source.create("js", "new Object()");
            rnd = new Random();
            propertyKeys = IntStream.range(0, PROPERTIES_COUNT).mapToObj(i -> generateString(3 + rnd.nextInt(MAX_PROPERTY_KEY_LENGTH - MIN_PROPERTY_KEY_LENGTH + 1))).toArray(
                            String[]::new);
            propertyValues = IntStream.range(0, PROPERTIES_COUNT).mapToObj(i -> generateString(3 + rnd.nextInt(MAX_PROPERTY_VALUE_LENGTH - MIN_PROPERTY_VALUE_LENGTH + 1))).toArray(
                            String[]::new);
        }

        @TearDown(Level.Trial)
        public void doTearDown() {
            context.close();
        }
    }

    @Benchmark
    public Value testPopulateJSObjectFromJava(MyState state) {
        Value object = state.context.eval(state.emptyObjectSource);
        for (int i = 0; i < MyState.PROPERTIES_COUNT; i++) {
            object.putMember(state.propertyKeys[i], state.propertyValues[i]);
        }
        return object;
    }

}