Package io.opentelemetry.sdk.metrics.internal.state

Class EmptyMetricStorage

java.lang.Object

io.opentelemetry.sdk.metrics.internal.state.EmptyMetricStorage

All Implemented Interfaces:

MetricStorage, SynchronousMetricStorage, WriteableMetricStorage

final class EmptyMetricStorage
extends java.lang.Object
implements SynchronousMetricStorage

Field Summary

Fields

Modifier and Type	Field	Description
private MetricDescriptor	descriptor
(package private) static EmptyMetricStorage	INSTANCE

Fields inherited from interface io.opentelemetry.sdk.metrics.internal.state.MetricStorage

CARDINALITY_OVERFLOW, DEFAULT_MAX_CARDINALITY

Constructor Summary

Constructors

Modifier	Constructor	Description
private	EmptyMetricStorage()

Method Summary

Modifier and Type	Method	Description
MetricData	collect(Resource resource, InstrumentationScopeInfo instrumentationScopeInfo, long startEpochNanos, long epochNanos)	Collects the metrics from this storage.
MetricDescriptor	getMetricDescriptor()	Returns a description of the metric produced in this storage.
boolean	isEnabled()	Returns true if the storage is actively recording measurements, and false otherwise (i.e.
void	recordDouble(double value, Attributes attributes, Context context)	Records a measurement.
void	recordLong(long value, Attributes attributes, Context context)	Records a measurement.

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.opentelemetry.sdk.metrics.internal.state.MetricStorage

isEmpty

Field Detail

INSTANCE

static final EmptyMetricStorage INSTANCE

descriptor

private final MetricDescriptor descriptor

Constructor Detail

EmptyMetricStorage

private EmptyMetricStorage()

Method Detail

getMetricDescriptor

public MetricDescriptor getMetricDescriptor()

Description copied from interface: MetricStorage

Returns a description of the metric produced in this storage.

Specified by:

getMetricDescriptor in interface MetricStorage

collect

public MetricData collect(Resource resource,
                          InstrumentationScopeInfo instrumentationScopeInfo,
                          long startEpochNanos,
                          long epochNanos)

Description copied from interface: MetricStorage

Collects the metrics from this storage. If storing AggregationTemporality.DELTA metrics, reset for the next collection period.

Note: This is a stateful operation and will reset any interval-related state for the collector.

Specified by:

collect in interface MetricStorage

Parameters:

resource - The resource associated with the metrics.

instrumentationScopeInfo - The instrumentation scope generating the metrics.

startEpochNanos - The start timestamp for this SDK.

epochNanos - The timestamp for this collection.

Returns:

The MetricData from this collection period.

recordLong

public void recordLong(long value,
                       Attributes attributes,
                       Context context)

Description copied from interface: WriteableMetricStorage

Records a measurement.

Specified by:

recordLong in interface WriteableMetricStorage

recordDouble

public void recordDouble(double value,
                         Attributes attributes,
                         Context context)

Description copied from interface: WriteableMetricStorage

Records a measurement.

Specified by:

recordDouble in interface WriteableMetricStorage

isEnabled

public boolean isEnabled()

Description copied from interface: WriteableMetricStorage

Returns true if the storage is actively recording measurements, and false otherwise (i.e. noop / empty metric storage is installed).

Specified by:

isEnabled in interface WriteableMetricStorage