org.onlab.metrics

Class MetricsManager

java.lang.Object

org.onlab.metrics.MetricsManager

All Implemented Interfaces:

MetricsService

public class MetricsManager
extends Object
implements MetricsService

This class holds the Metrics registry for ONOS. All metrics (Counter, Histogram, Timer, Meter, Gauge) use a hierarchical string-based naming scheme: COMPONENT.FEATURE.NAME. Example: "Topology.Counters.TopologyUpdates". The COMPONENT and FEATURE names have to be registered in advance before a metric can be created. Example:

   
     private final MetricsManager.MetricsComponent COMPONENT =
         MetricsManager.registerComponent("Topology");
     private final MetricsManager.MetricsFeature FEATURE =
         COMPONENT.registerFeature("Counters");
     private final Counter counterTopologyUpdates =
         MetricsManager.createCounter(COMPONENT, FEATURE, "TopologyUpdates");
   
 

Gauges are slightly different because they are not created directly in this class, but are allocated by the caller and passed in for registration:

   
     private final Gauge<Long> gauge =
         new  Gauge&lt;Long&gt() {
              @Override
             public Long getValue() {
                 return gaugeValue;
             }
         };
     MetricsManager.registerMetric(COMPONENT, FEATURE, GAUGE_NAME, gauge);
   
 

Constructor Summary

Constructors

Constructor and Description
MetricsManager()

Method Summary

Modifier and Type	Method and Description
protected void	clear() Clears the internal state.
com.codahale.metrics.Counter	createCounter(MetricsComponent component, MetricsFeature feature, String metricName) Creates a Counter metric.
com.codahale.metrics.Histogram	createHistogram(MetricsComponent component, MetricsFeature feature, String metricName) Creates a Histogram metric.
com.codahale.metrics.Meter	createMeter(MetricsComponent component, MetricsFeature feature, String metricName) Creates a Meter metric.
com.codahale.metrics.Timer	createTimer(MetricsComponent component, MetricsFeature feature, String metricName) Creates a Timer metric.
Map<String,com.codahale.metrics.Counter>	getCounters(com.codahale.metrics.MetricFilter filter) Fetches the existing Counters.
Map<String,com.codahale.metrics.Gauge>	getGauges(com.codahale.metrics.MetricFilter filter) Fetches the existing Gauges.
Map<String,com.codahale.metrics.Histogram>	getHistograms(com.codahale.metrics.MetricFilter filter) Fetches the existing Histograms.
Map<String,com.codahale.metrics.Meter>	getMeters(com.codahale.metrics.MetricFilter filter) Fetches the existing Meters.
com.codahale.metrics.MetricRegistry	getMetricRegistry() Fetches existing metric registry.
Map<String,com.codahale.metrics.Metric>	getMetrics() Fetches the existing Meters.
Map<String,com.codahale.metrics.Timer>	getTimers(com.codahale.metrics.MetricFilter filter) Fetches the existing Timers.
void	notifyReporters() Notifies the changes on metric registry to all registered reporters.
MetricsComponent	registerComponent(String name) Registers a component.
<T extends com.codahale.metrics.Metric> T	registerMetric(MetricsComponent component, MetricsFeature feature, String metricName, T metric) Registers an already created Metric.
void	registerReporter(MetricsReporter reporter) Registers a reporter to receive any changes on metric registry.
void	removeMatching(com.codahale.metrics.MetricFilter filter) Removes all Metrics that match a given filter.
boolean	removeMetric(MetricsComponent component, MetricsFeature feature, String metricName) Removes the metric with the given name.
void	unregisterReporter(MetricsReporter reporter) Unregisters the given metric reporter.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MetricsManager

public MetricsManager()

Method Detail

clear

protected void clear()

Clears the internal state.

registerComponent

public MetricsComponent registerComponent(String name)

Registers a component.

Specified by:

registerComponent in interface MetricsService

Parameters:

name - name of the Component to register

Returns:

MetricsComponent object that can be used to create Metrics.

getMetricRegistry

public com.codahale.metrics.MetricRegistry getMetricRegistry()

Fetches existing metric registry.

Specified by:

getMetricRegistry in interface MetricsService

Returns:

metric registry

createCounter

public com.codahale.metrics.Counter createCounter(MetricsComponent component,
                                                  MetricsFeature feature,
                                                  String metricName)

Creates a Counter metric.

Specified by:

createCounter in interface MetricsService

Parameters:

component - component the Counter is defined in

feature - feature the Counter is defined in

metricName - local name of the metric

Returns:

the created Counter Meteric

createHistogram

public com.codahale.metrics.Histogram createHistogram(MetricsComponent component,
                                                      MetricsFeature feature,
                                                      String metricName)

Creates a Histogram metric.

Specified by:

createHistogram in interface MetricsService

Parameters:

component - component the Histogram is defined in

feature - feature the Histogram is defined in

metricName - local name of the metric

Returns:

the created Histogram Metric

createTimer

public com.codahale.metrics.Timer createTimer(MetricsComponent component,
                                              MetricsFeature feature,
                                              String metricName)

Creates a Timer metric.

Specified by:

createTimer in interface MetricsService

Parameters:

component - component the Timer is defined in

feature - feature the Timer is defined in

metricName - local name of the metric

Returns:

the created Timer Metric

createMeter

public com.codahale.metrics.Meter createMeter(MetricsComponent component,
                                              MetricsFeature feature,
                                              String metricName)

Creates a Meter metric.

Specified by:

createMeter in interface MetricsService

Parameters:

component - component the Meter is defined in

feature - feature the Meter is defined in

metricName - local name of the metric

Returns:

the created Meter Metric

registerMetric

public <T extends com.codahale.metrics.Metric> T registerMetric(MetricsComponent component,
                                                                MetricsFeature feature,
                                                                String metricName,
                                                                T metric)

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.

Specified by:

registerMetric in interface MetricsService

Type Parameters:

T - Metric type

Parameters:

component - component the Metric is defined in

feature - feature the Metric is defined in

metricName - local name of the metric

metric - Metric to register

Returns:

the registered Metric

registerReporter

public void registerReporter(MetricsReporter reporter)

Registers a reporter to receive any changes on metric registry.

Specified by:

registerReporter in interface MetricsService

Parameters:

reporter - metric reporter

unregisterReporter

public void unregisterReporter(MetricsReporter reporter)

Unregisters the given metric reporter.

Specified by:

unregisterReporter in interface MetricsService

Parameters:

reporter - metric reporter

notifyReporters

public void notifyReporters()

Notifies the changes on metric registry to all registered reporters.

Specified by:

notifyReporters in interface MetricsService

removeMetric

public boolean removeMetric(MetricsComponent component,
                            MetricsFeature feature,
                            String metricName)

Removes the metric with the given name.

Specified by:

removeMetric in interface MetricsService

Parameters:

component - component the Metric is defined in

feature - feature the Metric is defined in

metricName - local name of the metric

Returns:

true if the metric existed and was removed, otherwise false

getTimers

public Map<String,com.codahale.metrics.Timer> getTimers(com.codahale.metrics.MetricFilter filter)

Fetches the existing Timers.

Specified by:

getTimers in interface MetricsService

Parameters:

filter - filter to use to select Timers

Returns:

a map of the Timers that match the filter, with the key as the name String to the Timer.

getGauges

public Map<String,com.codahale.metrics.Gauge> getGauges(com.codahale.metrics.MetricFilter filter)

Fetches the existing Gauges.

Specified by:

getGauges in interface MetricsService

Parameters:

filter - filter to use to select Gauges

Returns:

a map of the Gauges that match the filter, with the key as the name String to the Gauge.

getCounters

public Map<String,com.codahale.metrics.Counter> getCounters(com.codahale.metrics.MetricFilter filter)

Fetches the existing Counters.

Specified by:

getCounters in interface MetricsService

Parameters:

filter - filter to use to select Counters

Returns:

a map of the Counters that match the filter, with the key as the name String to the Counter.

getMeters

public Map<String,com.codahale.metrics.Meter> getMeters(com.codahale.metrics.MetricFilter filter)

Fetches the existing Meters.

Specified by:

getMeters in interface MetricsService

Parameters:

filter - filter to use to select Meters

Returns:

a map of the Meters that match the filter, with the key as the name String to the Meter.

getHistograms

public Map<String,com.codahale.metrics.Histogram> getHistograms(com.codahale.metrics.MetricFilter filter)

Fetches the existing Histograms.

Specified by:

getHistograms in interface MetricsService

Parameters:

filter - filter to use to select Histograms

Returns:

a map of the Histograms that match the filter, with the key as the name String to the Histogram.

removeMatching

public void removeMatching(com.codahale.metrics.MetricFilter filter)

Removes all Metrics that match a given filter.

Specified by:

removeMatching in interface MetricsService

Parameters:

filter - filter to use to select the Metrics to remove.

getMetrics

public Map<String,com.codahale.metrics.Metric> getMetrics()

Fetches the existing Meters.

Specified by:

getMetrics in interface MetricsService

Returns:

a map of all metrics with the key as the name String to the Meter.