ReflectAsmBenchmark.java

import java.lang.reflect.Field;
import java.util.concurrent.TimeUnit;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;
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 com.esotericsoftware.reflectasm.FieldAccess;


@State(Scope.Benchmark)
@Warmup(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
@Fork(1)
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
public class ReflectAsmBenchmark {

	private FooBar fooBar = new FooBar();
	private Field field;
	private FieldAccess fieldAcccess = FieldAccess.get(FooBar.class);
	private int fieldIndex = fieldAcccess.getIndex("value");

	@Setup
	public void setup() throws Exception {
		field = FooBar.class.getField("value");
		field.setAccessible(true);
		
	}

	@Benchmark
	public Object testReflection() throws IllegalArgumentException, IllegalAccessException {
		return field.get(fooBar);
	}
	
	@Benchmark
	public Object testReflectasm() throws IllegalArgumentException, IllegalAccessException {
		return fieldAcccess.get(fooBar, fieldIndex);
	}
	

	public static void main(String[] args) throws RunnerException {
		Options opt = new OptionsBuilder().include(ReflectAsmBenchmark.class.getSimpleName()).build();

		new Runner(opt).run();
	}

	public static class FooBar {
		public String value = "foo";
	}

}