/**
* Decrement a metric by name.
*
* @param name of the metric
* @param factory to lazily create the metric if not null
*/
public void decr(String name, MetricMutableFactory factory) {
MetricMutable m = metricsMap.get(name);
if (m != null) {
if (m instanceof MetricMutableGauge<?>) {
((MetricMutableGauge<?>) m).decr();
} else {
throw new MetricsException("Unsupported decr() for metric " + name);
}
} else if (factory != null) {
metricsMap.put(name, factory.newMetric(name));
decr(name, null);
} else {
throw new MetricsException("Metric " + name + " doesn't exist");
}
}
/**
* Decrement a metric by name.
*
* @param name of the metric
*/
public void decr(String name) {
decr(name, mf);
}