MetricsService.java
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package org.onlab.metrics;
import java.util.Map;
import com.codahale.metrics.Counter;
import com.codahale.metrics.Gauge;
import com.codahale.metrics.Histogram;
import com.codahale.metrics.Meter;
import com.codahale.metrics.Metric;
import com.codahale.metrics.MetricFilter;
import com.codahale.metrics.Timer;
/**
* Metrics Service to collect metrics.
*/
interface MetricsService {
/**
* Registers a component.
*
* @param name name of the Component to register
* @return MetricsComponent object that can be used to create Metrics.
*/
MetricsComponent registerComponent(String name);
/**
* Creates a Counter metric.
*
* @param component component the Counter is defined in
* @param feature feature the Counter is defined in
* @param metricName local name of the metric
* @return the created Counter Meteric
*/
Counter createCounter(MetricsComponent component,
MetricsFeature feature,
String metricName);
/**
* Creates a Histogram metric.
*
* @param component component the Histogram is defined in
* @param feature feature the Histogram is defined in
* @param metricName local name of the metric
* @return the created Histogram Metric
*/
Histogram createHistogram(MetricsComponent component,
MetricsFeature feature,
String metricName);
/**
* Creates a Timer metric.
*
* @param component component the Timer is defined in
* @param feature feature the Timer is defined in
* @param metricName local name of the metric
* @return the created Timer Metric
*/
Timer createTimer(MetricsComponent component,
MetricsFeature feature,
String metricName);
/**
* Registers an already created Metric. This is used for situation where a
* caller needs to allocate its own Metric, but still register it with the
* system.
*
* @param <T> Metric type
* @param component component the Metric is defined in
* @param feature feature the Metric is defined in
* @param metricName local name of the metric
* @param metric Metric to register
* @return the registered Metric
*/
<T extends Metric> T registerMetric(
MetricsComponent component,
MetricsFeature feature,
String metricName,
T metric);
/**
* Fetches the existing Timers.
*
* @param filter filter to use to select Timers
* @return a map of the Timers that match the filter, with the key as the
* name String to the Timer.
*/
Map<String, Timer> getTimers(MetricFilter filter);
/**
* Fetches the existing Gauges.
*
* @param filter filter to use to select Gauges
* @return a map of the Gauges that match the filter, with the key as the
* name String to the Gauge.
*/
Map<String, Gauge> getGauges(MetricFilter filter);
/**
* Fetches the existing Counters.
*
* @param filter filter to use to select Counters
* @return a map of the Counters that match the filter, with the key as the
* name String to the Counter.
*/
Map<String, Counter> getCounters(MetricFilter filter);
/**
* Fetches the existing Meters.
*
* @param filter filter to use to select Meters
* @return a map of the Meters that match the filter, with the key as the
* name String to the Meter.
*/
Map<String, Meter> getMeters(MetricFilter filter);
/**
* Fetches the existing Histograms.
*
* @param filter filter to use to select Histograms
* @return a map of the Histograms that match the filter, with the key as the
* name String to the Histogram.
*/
Map<String, Histogram> getHistograms(MetricFilter filter);
/**
* Removes all Metrics that match a given filter.
*
* @param filter filter to use to select the Metrics to remove.
*/
void removeMatching(MetricFilter filter);
}