JavaBackendAutumn/src/main/java/edu/project5/ReflectionBenchmark.java at master · Space27/JavaBackendAutumn · GitHub

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package edu.project5;

import java.lang.invoke.CallSite;
import java.lang.invoke.LambdaMetafactory;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.concurrent.TimeUnit;
import java.util.function.Supplier;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.infra.Blackhole;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.RunnerException;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;
import org.openjdk.jmh.runner.options.TimeValue;

@State(Scope.Thread)
public class ReflectionBenchmark {

    @SuppressWarnings({"checkstyle:UncommentedMain", "checkstyle:MagicNumber"})
    public static void main(String[] args) throws RunnerException {
        Options options = new OptionsBuilder()
            .include(ReflectionBenchmark.class.getSimpleName())
            .shouldFailOnError(true)
            .shouldDoGC(true)
            .mode(Mode.AverageTime)
            .timeUnit(TimeUnit.NANOSECONDS)
            .forks(1)
            .warmupForks(1)
            .warmupIterations(1)
            .warmupTime(TimeValue.seconds(5))
            .measurementIterations(1)
            .measurementTime(TimeValue.seconds(5))
            .build();

        new Runner(options).run();
    }

    private static final String METHOD_NAME = "name";
    private Student student;
    private Method method;
    private MethodHandle methodHandle;
    private Supplier<String> lambda;

    @Setup
    @SuppressWarnings("unchecked")
    public void setup() throws Throwable {
        MethodHandles.Lookup publicLookup = MethodHandles.publicLookup();
        MethodHandles.Lookup lookup = MethodHandles.lookup();
        MethodType mt = MethodType.methodType(String.class);

        student = new Student("Daniil", "Lokosov");

        method = student.getClass().getMethod(METHOD_NAME);

        methodHandle = publicLookup.findVirtual(Student.class, METHOD_NAME, mt);

        CallSite callSite = LambdaMetafactory.metafactory(
            lookup,
            "get",
            MethodType.methodType(Supplier.class, Student.class),
            MethodType.methodType(Object.class),
            methodHandle,
            mt
        );
        lambda = (Supplier<String>) callSite.getTarget().invokeExact(student);
    }

    @Benchmark
    public void directAccess(Blackhole bh) {
        String name = student.name();
        bh.consume(name);
    }

    @Benchmark
    public void reflection(Blackhole bh) throws InvocationTargetException, IllegalAccessException {
        String name = (String) method.invoke(student);
        bh.consume(name);
    }

    @Benchmark
    public void methodHandles(Blackhole bh) throws Throwable {
        String name = (String) methodHandle.invokeExact(student);
        bh.consume(name);
    }

    @Benchmark
    public void lambdaMetafactory(Blackhole bh) {
        String name = lambda.get();
        bh.consume(name);
    }
}