Package io.quarkus.micrometer.deployment.binder.mpmetrics

Class GaugeAnnotationHandler

  • public class GaugeAnnotationHandler
extends Object
    Create beans to handle @Gauge annotations. This is a static utility class, it stores no state. It is ok to import and use classes that reference MP Metrics classes.

    • Constructor Detail

      • GaugeAnnotationHandler

        public GaugeAnnotationHandler()

    • Method Detail

      • processAnnotatedGauges

        static void processAnnotatedGauges​(org.jboss.jandex.IndexView index,
                                   io.quarkus.gizmo.ClassOutput classOutput)

      • createClass

        static void createClass​(org.jboss.jandex.IndexView index,
                        io.quarkus.gizmo.ClassOutput classOutput,
                        String generatedClassName,
                        org.jboss.jandex.AnnotationInstance annotation,
                        org.jboss.jandex.AnnotationTarget target,
                        org.jboss.jandex.ClassInfo classInfo,
                        org.jboss.jandex.MethodInfo methodInfo)
        Given this Widget class: 
         public class Widget  {
     private LongAccumulator highestValue = new LongAccumulator(Long::max, 0);

     // ... some other things that change the value in the accumulator ...

     @Gauge(name = "highestValue", unit = MetricUnits.NONE, description = "Highest observed value.")
     public Long highestValue() {
         return highestValue.get();
     }
 }
 
        
 This method will generate a GaugeAdapter to call the annotated method:

 
         public class Widget_GaugeAdapter extends GaugeAdapter.GaugeAdapterImpl implements GaugeAdapter {

     @Inject
     Widget target;

     public Widget_GaugeAdapter() {
         // name, description, and tags are created from annotation attributes
         // init is a method on the superclass
         super(name, description, tags);
     }

     Number getValue() {
         return target.highestValue;
     }

     Object getValue() {
         return getValue();
     }
 }