in geronimo-metrics-common/src/main/java/org/apache/geronimo/microprofile/metrics/common/RegistryImpl.java [403:417]
public Timer timer(final Metadata metadata, final Tag... tags) {
final MetricID metricID = new MetricID(metadata.getName(), tags);
Holder<? extends Metric> holder = metrics.get(metricID);
if (holder == null) {
holder = new Holder<>(new TimerImpl(metadata.getUnit() == null ? MetricUnits.NONE : metadata.getUnit()), enforceType(metadata, MetricType.TIMER), metricID);
final Holder<? extends Metric> existing = metrics.putIfAbsent(metricID, holder);
if (existing != null) {
holder = existing;
}
}
if (!Timer.class.isInstance(holder.metric)) {
throw new IllegalArgumentException(holder.metric + " is not a timer");
}
return Timer.class.cast(holder.metric);
}