Package io.micrometer.core.instrument

Interface Meter

All Known Subinterfaces:

Counter, DistributionSummary, FunctionCounter, FunctionTimer, Gauge, HistogramSupport, LongTaskTimer, TimeGauge, Timer

All Known Implementing Classes:

AbstractDistributionSummary, AbstractMeter, AbstractTimer, CompositeFunctionCounter, CumulativeCounter, CumulativeDistributionSummary, CumulativeFunctionCounter, CumulativeFunctionTimer, CumulativeHistogramLongTaskTimer, CumulativeTimer, DefaultGauge, DefaultLongTaskTimer, DefaultMeter, DropwizardCounter, DropwizardDistributionSummary, DropwizardFunctionCounter, DropwizardFunctionTimer, DropwizardGauge, DropwizardTimer, NoopCounter, NoopDistributionSummary, NoopFunctionCounter, NoopFunctionTimer, NoopGauge, NoopLongTaskTimer, NoopMeter, NoopTimeGauge, NoopTimer, StepCounter, StepDistributionSummary, StepFunctionCounter, StepFunctionTimer, StepTimer

public interface Meter

A named and dimensioned producer of one or more measurements.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	Meter.Builder	Fluent builder for custom meters.
static class	Meter.Id	A meter is uniquely identified by its combination of name and tags.
static interface	Meter.MeterProvider<T extends Meter>	Convenience interface to create new meters from tags based on a common "template"/builder.
static enum	Meter.Type	Custom meters may emit metrics like one of these types without implementing the corresponding interface.

Method Summary

Modifier and Type	Method	Description
static Meter.Builder	builder(String name, Meter.Type type, Iterable<Measurement> measurements)
default void	close()
Meter.Id	getId()
default <T> T	match(Function<Gauge,T> visitGauge, Function<Counter,T> visitCounter, Function<Timer,T> visitTimer, Function<DistributionSummary,T> visitSummary, Function<LongTaskTimer,T> visitLongTaskTimer, Function<TimeGauge,T> visitTimeGauge, Function<FunctionCounter,T> visitFunctionCounter, Function<FunctionTimer,T> visitFunctionTimer, Function<Meter,T> visitMeter)	Match a Meter by type with series of dedicated functions for specific Meters and return a result from the matched function.
Iterable<Measurement>	measure()	Get a set of measurements.
default void	use(Consumer<Gauge> visitGauge, Consumer<Counter> visitCounter, Consumer<Timer> visitTimer, Consumer<DistributionSummary> visitSummary, Consumer<LongTaskTimer> visitLongTaskTimer, Consumer<TimeGauge> visitTimeGauge, Consumer<FunctionCounter> visitFunctionCounter, Consumer<FunctionTimer> visitFunctionTimer, Consumer<Meter> visitMeter)	Match a Meter with a series of dedicated functions for specific Meters and call the matching consumer.

Method Details

builder

static Meter.Builder builder(String name,
 Meter.Type type,
 Iterable<Measurement> measurements)

getId

Meter.Id getId()

Returns:

A unique combination of name and tags

measure

Iterable<Measurement> measure()

Get a set of measurements. Should always return the same number of measurements and in the same order, regardless of the level of activity or the lack thereof.

Returns:

The set of measurements that represents the instantaneous value of this meter.

match

default <T> T match(Function<Gauge,T> visitGauge,
 Function<Counter,T> visitCounter,
 Function<Timer,T> visitTimer,
 Function<DistributionSummary,T> visitSummary,
 Function<LongTaskTimer,T> visitLongTaskTimer,
 Function<TimeGauge,T> visitTimeGauge,
 Function<FunctionCounter,T> visitFunctionCounter,
 Function<FunctionTimer,T> visitFunctionTimer,
 Function<Meter,T> visitMeter)

Match a Meter by type with series of dedicated functions for specific Meters and return a result from the matched function.

NOTE: This method contract will change in minor releases if ever a new Meter type is created. In this case only, this is considered a feature. By using this method, you are declaring that you want to be sure to handle all types of meters. A breaking API change during the introduction of a new Meter indicates that there is a new meter type for you to consider and the compiler will effectively require you to consider it.

Type Parameters:

T - return type of function to apply

Parameters:

visitGauge - function to apply for Gauge

visitCounter - function to apply for Counter

visitTimer - function to apply for Timer

visitSummary - function to apply for DistributionSummary

visitLongTaskTimer - function to apply for LongTaskTimer

visitTimeGauge - function to apply for TimeGauge

visitFunctionCounter - function to apply for FunctionCounter

visitFunctionTimer - function to apply for FunctionTimer

visitMeter - function to apply as a fallback

Returns:

return value from the applied function

Since:

1.1.0

use

default void use(Consumer<Gauge> visitGauge,
 Consumer<Counter> visitCounter,
 Consumer<Timer> visitTimer,
 Consumer<DistributionSummary> visitSummary,
 Consumer<LongTaskTimer> visitLongTaskTimer,
 Consumer<TimeGauge> visitTimeGauge,
 Consumer<FunctionCounter> visitFunctionCounter,
 Consumer<FunctionTimer> visitFunctionTimer,
 Consumer<Meter> visitMeter)

Match a Meter with a series of dedicated functions for specific Meters and call the matching consumer.

NOTE: This method contract will change in minor releases if ever a new Meter type is created. In this case only, this is considered a feature. By using this method, you are declaring that you want to be sure to handle all types of meters. A breaking API change during the introduction of a new Meter indicates that there is a new meter type for you to consider and the compiler will effectively require you to consider it.

Parameters:

visitGauge - function to apply for Gauge

visitCounter - function to apply for Counter

visitTimer - function to apply for Timer

visitSummary - function to apply for DistributionSummary

visitLongTaskTimer - function to apply for LongTaskTimer

visitTimeGauge - function to apply for TimeGauge

visitFunctionCounter - function to apply for FunctionCounter

visitFunctionTimer - function to apply for FunctionTimer

visitMeter - function to apply as a fallback

Since:

1.1.0

close

default void close()