public Gauge gauge()

in geronimo-metrics-common/src/main/java/org/apache/geronimo/microprofile/metrics/common/RegistryImpl.java [223:239]

• 17 lines of code
• 4 McCabe index (conditional complexity)

    public <T extends Number> Gauge<T> gauge(final MetricID metricID, final Supplier<T> supplier) {
        Holder<? extends Metric> holder = metrics.get(metricID);
        if (holder == null) {
            holder = new Holder<>(
                    new SimpleGaugeImpl<>(supplier),
                    Metadata.builder().withName(metricID.getName()).withType(MetricType.GAUGE).build(),
                    metricID);
            final Holder<? extends Metric> existing = metrics.putIfAbsent(holder.metricID, holder);
            if (existing != null) {
                holder = existing;
            }
        }
        if (!Gauge.class.isInstance(holder.metric)) {
            throw new IllegalArgumentException(holder.metric + " is not a gauge");
        }
        return Gauge.class.cast(holder.metric);
    }