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A Micrometer meter registry that generates JFR events

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package com.github.marschall.micrometer.jfr;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

import io.micrometer.core.instrument.Meter.Id;
import jdk.jfr.AnnotationElement;
import jdk.jfr.Description;
import jdk.jfr.EventFactory;
import jdk.jfr.Label;
import jdk.jfr.ValueDescriptor;

final class CounterEventFactory extends AbstractMeterEventFactory {

  CounterEventFactory(Id id) {
    super(id);
  }

  @Override
  protected List getAdditionalValueDescriptors() {
    List incrementAnnotations = new ArrayList<>(3);
    incrementAnnotations.add(new AnnotationElement(Label.class, "Increment"));
    incrementAnnotations.add(new AnnotationElement(Description.class, "Amount to add to the counter."));
    Optional baseUnitAnnotation = this.getAnnotationElementOfBaseUnit();
    if (baseUnitAnnotation.isPresent()) {
      incrementAnnotations.add(baseUnitAnnotation.get());
    }
    ValueDescriptor incrementDescriptor = new ValueDescriptor(double.class, "increment", incrementAnnotations);

    List valueAnnotations = new ArrayList<>(3);
    valueAnnotations.add(new AnnotationElement(Label.class, "Value"));
    valueAnnotations.add(new AnnotationElement(Description.class, "The current value of the counter."));
    if (baseUnitAnnotation.isPresent()) {
      valueAnnotations.add(baseUnitAnnotation.get());
    }
    ValueDescriptor valueDescriptor = new ValueDescriptor(double.class, "value", valueAnnotations);

    return List.of(incrementDescriptor, valueDescriptor);
  }

  @Override
  JfrCounterEvent newEmptyEvent(EventFactory eventFactory) {
    return new JfrCounterEvent(this.id, eventFactory.newEvent());
  }

}