void onMetric()

in geronimo-metrics/src/main/java/org/apache/geronimo/microprofile/metrics/cdi/MetricsExtension.java [166:214]
44 lines of code
5 McCabe index (conditional complexity)

    void onMetric(@Observes final ProcessInjectionPoint<?, ?> metricInjectionPointProcessEvent) {
        final InjectionPoint injectionPoint = metricInjectionPointProcessEvent.getInjectionPoint();
        final Class<?> clazz = findClass(injectionPoint.getType());
        if (clazz == null || !Metric.class.isAssignableFrom(clazz)) {
            return;
        }

        final Annotated annotated = injectionPoint.getAnnotated();
        final org.eclipse.microprofile.metrics.annotation.Metric config = annotated.getAnnotation(
                org.eclipse.microprofile.metrics.annotation.Metric.class);

        final MetricType type = findType(clazz);
        if (config != null) {
            final String name = Names.findName(injectionPoint.getMember().getDeclaringClass(), injectionPoint.getMember(),
                    of(config.name()).filter(it -> !it.isEmpty()).orElseGet(injectionPoint.getMember()::getName), config.absolute(),
                    "");
            final Metadata metadata = Metadata.builder()
                    .withName(name)
                    .withDisplayName(config.displayName())
                    .withDescription(config.description())
                    .withType(type)
                    .withUnit(config.unit())
                    .build();
            final MetricID id = new MetricID(name, createTags(config.tags()));
            addRegistration(metadata, id);

            if (!name.equals(config.name())) {
                final Annotation[] newQualifiers = Stream.concat(metricInjectionPointProcessEvent.getInjectionPoint().getQualifiers().stream()
                                .filter(it -> it.annotationType() != org.eclipse.microprofile.metrics.annotation.Metric.class),
                        Stream.of(new MetricImpl(metadata, id)))
                        .toArray(Annotation[]::new);
                metricInjectionPointProcessEvent.configureInjectionPoint()
                        .qualifiers(newQualifiers);
            }
        } else {
            final String name = MetricRegistry.name(injectionPoint.getMember().getDeclaringClass(), injectionPoint.getMember().getName());
            final Metadata metadata = Metadata.builder().withName(name).withType(type).build();
            final MetricID metricID = new MetricID(name);
            addRegistration(metadata, metricID);

            // ensure the injection uses the qualifier since we'll not register it without
            final Annotation[] newQualifiers = Stream.concat(metricInjectionPointProcessEvent.getInjectionPoint().getQualifiers().stream()
                            .filter(it -> it.annotationType() != Default.class),
                    Stream.of(new MetricImpl(metadata, metricID)))
                    .toArray(Annotation[]::new);
            metricInjectionPointProcessEvent.configureInjectionPoint()
                    .qualifiers(newQualifiers);
        }
    }