/**
* Removes the metric with the given name.
*
* @param name the name of the metric
*/
public void removeMetric(MetricName name) {
final Metric metric = metrics.remove(name);
if (metric != null) {
if (metric instanceof Stoppable) {
((Stoppable) metric).stop();
}
notifyMetricRemoved(name);
}
}
/**
* Gets any existing metric with the given name or, if none exists, adds the given metric.
*
* @param name the metric's name
* @param metric the new metric
* @param <T> the type of the metric
* @return either the existing metric or {@code metric}
*/
@SuppressWarnings("unchecked")
protected final <T extends Metric> T getOrAdd(MetricName name, T metric) {
final Metric existingMetric = metrics.get(name);
if (existingMetric == null) {
final Metric justAddedMetric = metrics.putIfAbsent(name, metric);
if (justAddedMetric == null) {
notifyMetricAdded(name, metric);
return metric;
}
if (metric instanceof Stoppable) {
((Stoppable) metric).stop();
}
return (T) justAddedMetric;
}
return (T) existingMetric;
}
public void stop() {
stopper.stop();
}
