org.apache.calcite.avatica.metrics

Class MetricsSystemLoader

java.lang.Object

org.apache.calcite.avatica.metrics.MetricsSystemLoader

public class MetricsSystemLoader
extends Object

A utility encapsulating use of ServiceLoader to instantiate a MetricsSystem.

Field Summary

Fields

Modifier and Type	Field and Description
private static MetricsSystemLoader	INSTANCE
private static org.slf4j.Logger	LOG

Constructor Summary

Constructors

Modifier	Constructor and Description
private	MetricsSystemLoader()

Method Summary

Methods

Modifier and Type	Method and Description
(package private) MetricsSystem	_load(MetricsSystemConfiguration<?> config)
(package private) List<MetricsSystemFactory>	getFactories()
static MetricsSystem	load(MetricsSystemConfiguration<?> config) Creates a MetricsSystem instance using the corresponding MetricsSystemFactory available to ServiceLoader on the classpath.

Methods inherited from class java.lang.Object

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

Field Detail

LOG

private static final org.slf4j.Logger LOG

INSTANCE

private static final MetricsSystemLoader INSTANCE

Constructor Detail

MetricsSystemLoader

private MetricsSystemLoader()

Method Detail

load

public static MetricsSystem load(MetricsSystemConfiguration<?> config)

Creates a MetricsSystem instance using the corresponding MetricsSystemFactory available to ServiceLoader on the classpath. If there is not exactly one instance of a MetricsSystemFactory, an instance of NoopMetricsSystem will be returned.

Parameters:

config - State to pass to the MetricsSystemFactory.

Returns:

A MetricsSystem implementation.

_load

MetricsSystem _load(MetricsSystemConfiguration<?> config)

getFactories

List<MetricsSystemFactory> getFactories()