org.apache.solr.metrics

Class SolrMetricsContext

java.lang.Object

org.apache.solr.metrics.SolrMetricsContext

public class SolrMetricsContext
extends Object

This class represents a metrics context that ties together components with the same life-cycle and provides convenient access to the metric registry.

Field Summary

Fields

Modifier and Type	Field and Description
SolrMetricManager	metricManager
String	registry
String	tag

Constructor Summary

Constructors

Constructor and Description
SolrMetricsContext(SolrMetricManager metricManager, String registry, String tag)

Method Summary

Modifier and Type	Method and Description
com.codahale.metrics.Counter	counter(SolrInfoBean info, String metricName, String... metricPath) Convenience method for SolrMetricManager.counter(SolrInfoBean, String, String, String...).
void	gauge(SolrInfoBean info, com.codahale.metrics.Gauge<?> gauge, boolean force, String metricName, String... metricPath) Convenience method for SolrMetricManager.registerGauge(SolrInfoBean, String, Gauge, String, boolean, String, String...).
SolrMetricsContext	getChildContext(Object child) Get a context with the same registry name but a tag that represents a parent-child relationship.
com.codahale.metrics.MetricRegistry	getMetricRegistry() Get the MetricRegistry instance that is used for registering metrics in this context.
String	getTag() Metrics tag that represents objects with the same life-cycle.
com.codahale.metrics.Histogram	histogram(SolrInfoBean info, String metricName, String... metricPath) Convenience method for SolrMetricManager.histogram(SolrInfoBean, String, String, String...).
com.codahale.metrics.Meter	meter(SolrInfoBean info, String metricName, String... metricPath) Convenience method for SolrMetricManager.meter(SolrInfoBean, String, String, String...).
Object	notANumber() See SolrMetricManager.notANumber().
Object	nullNumber() See SolrMetricManager.nullNumber().
Object	nullObject() See SolrMetricManager.nullObject().
Object	nullString() See SolrMetricManager.nullString().
com.codahale.metrics.Timer	timer(SolrInfoBean info, String metricName, String... metricPath) Convenience method for SolrMetricManager.meter(SolrInfoBean, String, String, String...).
void	unregister() Unregister all Gauge metrics that use this context's tag.

Methods inherited from class java.lang.Object

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

Field Detail

registry

public final String registry

metricManager

public final SolrMetricManager metricManager

tag

public final String tag

Constructor Detail

SolrMetricsContext

public SolrMetricsContext(SolrMetricManager metricManager,
                          String registry,
                          String tag)

Method Detail

nullNumber

public Object nullNumber()

See SolrMetricManager.nullNumber().

notANumber

public Object notANumber()

See SolrMetricManager.notANumber().

nullString

public Object nullString()

See SolrMetricManager.nullString().

nullObject

public Object nullObject()

See SolrMetricManager.nullObject().

getTag

public String getTag()

Metrics tag that represents objects with the same life-cycle.

unregister

public void unregister()

Unregister all Gauge metrics that use this context's tag.

NOTE: This method MUST be called at the end of a life-cycle (typically in close()) of components that register gauge metrics with references to the current object's instance. Failure to do so may result in hard-to-debug memory leaks.

getChildContext

public SolrMetricsContext getChildContext(Object child)

Get a context with the same registry name but a tag that represents a parent-child relationship. Since it's a different tag than the parent's context it is assumed that the life-cycle of the parent and child are different.

Parameters:

child - child object that produces metrics with a different life-cycle than the parent.

meter

public com.codahale.metrics.Meter meter(SolrInfoBean info,
                                        String metricName,
                                        String... metricPath)

Convenience method for SolrMetricManager.meter(SolrInfoBean, String, String, String...).

counter

public com.codahale.metrics.Counter counter(SolrInfoBean info,
                                            String metricName,
                                            String... metricPath)

Convenience method for SolrMetricManager.counter(SolrInfoBean, String, String, String...).

gauge

public void gauge(SolrInfoBean info,
                  com.codahale.metrics.Gauge<?> gauge,
                  boolean force,
                  String metricName,
                  String... metricPath)

Convenience method for SolrMetricManager.registerGauge(SolrInfoBean, String, Gauge, String, boolean, String, String...).

timer

public com.codahale.metrics.Timer timer(SolrInfoBean info,
                                        String metricName,
                                        String... metricPath)

Convenience method for SolrMetricManager.meter(SolrInfoBean, String, String, String...).

histogram

public com.codahale.metrics.Histogram histogram(SolrInfoBean info,
                                                String metricName,
                                                String... metricPath)

Convenience method for SolrMetricManager.histogram(SolrInfoBean, String, String, String...).

getMetricRegistry

public com.codahale.metrics.MetricRegistry getMetricRegistry()

Get the MetricRegistry instance that is used for registering metrics in this context.