Package org.graylog.metrics.prometheus

Class ReplaceableCollectorRegistry

java.lang.Object

io.prometheus.client.CollectorRegistry

org.graylog.metrics.prometheus.ReplaceableCollectorRegistry

public class ReplaceableCollectorRegistry
extends io.prometheus.client.CollectorRegistry

Custom CollectorRegistry that delegates all read operations to a registry reference. This allows atomic collector registry replacements at runtime. The standard CollectorRegistry only supports a register/unregister workflow which opens up a potential race condition. And since the HTTPServer doesn't allow the replacement of the collector registry without restarting the HTTP server, we need this custom implementation. Write operations are not supported and will throw an UnsupportedOperationException.

Field Summary

Fields inherited from class io.prometheus.client.CollectorRegistry

defaultRegistry

Constructor Summary

Constructors

Constructor	Description
ReplaceableCollectorRegistry(AtomicReference<io.prometheus.client.CollectorRegistry> registryRef)

Method Summary

Modifier and Type	Method	Description
void	clear()
Enumeration<io.prometheus.client.Collector.MetricFamilySamples>	filteredMetricFamilySamples(Set<String> includedNames)
Double	getSampleValue(String name)
Double	getSampleValue(String name, String[] labelNames, String[] labelValues)
Enumeration<io.prometheus.client.Collector.MetricFamilySamples>	metricFamilySamples()
void	register(io.prometheus.client.Collector m)
void	unregister(io.prometheus.client.Collector m)

Methods inherited from class java.lang.Object

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

Constructor Details

ReplaceableCollectorRegistry

public ReplaceableCollectorRegistry(AtomicReference<io.prometheus.client.CollectorRegistry> registryRef)

Method Details

register

public void register(io.prometheus.client.Collector m)

Overrides:

register in class io.prometheus.client.CollectorRegistry

unregister

public void unregister(io.prometheus.client.Collector m)

Overrides:

unregister in class io.prometheus.client.CollectorRegistry

clear

public void clear()

Overrides:

clear in class io.prometheus.client.CollectorRegistry

metricFamilySamples

public Enumeration<io.prometheus.client.Collector.MetricFamilySamples> metricFamilySamples()

Overrides:

metricFamilySamples in class io.prometheus.client.CollectorRegistry

filteredMetricFamilySamples

public Enumeration<io.prometheus.client.Collector.MetricFamilySamples> filteredMetricFamilySamples(Set<String> includedNames)

Overrides:

filteredMetricFamilySamples in class io.prometheus.client.CollectorRegistry

getSampleValue

public Double getSampleValue(String name)

Overrides:

getSampleValue in class io.prometheus.client.CollectorRegistry

getSampleValue

public Double getSampleValue(String name,
 String[] labelNames,
 String[] labelValues)

Overrides:

getSampleValue in class io.prometheus.client.CollectorRegistry