package com.fasterxml.clustermate.service.metrics;
import java.util.HashMap;
import com.codahale.metrics.Counter;
import com.codahale.metrics.ExponentiallyDecayingReservoir;
import com.codahale.metrics.Histogram;
import com.codahale.metrics.Metric;
import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.Timer;
/**
* Simple container for Metrics 3.0 registry.
* Bit complicated to work around issues with unit tests, where metrics are registered
* multiple types.
*<p>
* May need to consider making injectable (or passed via contexts).
*/
public class Metrics
{
protected final static MetricRegistry _metrics = new MetricRegistry();
protected final static HashMap<String, Metric> _registered = new HashMap<String,Metric>();
public static synchronized Counter newCounter(String name) {
Counter c = (Counter) _registered.get(name);
if (c == null) {
c = _metrics.counter(name);
_registered.put(name, c);
}
return c;
}
public static synchronized Timer newTimer(String name)
{
Timer t = (Timer) _registered.get(name);
if (t == null) {
t = _metrics.timer(name);
_registered.put(name, t);
}
return t;
}
public static synchronized Histogram newHistogram(String name)
{
Histogram h = (Histogram) _registered.get(name);
if (h == null) {
// default would be ExpDecayingReservoir; but let's make explicit
h = _metrics.register(name, new Histogram(new ExponentiallyDecayingReservoir()));
_registered.put(name, h);
}
return h;
}
}