io.opentelemetry.metrics

Interface Observer<R>

Type Parameters:

R - the callback Result type.

All Superinterfaces:

Instrument

All Known Subinterfaces:

DoubleObserver, LongObserver

@ThreadSafe
public interface Observer<R>
extends Instrument

Base interface for all the Observer metrics.

Since:

0.1.0

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	Observer.Builder Builder class for Observer.
static interface	Observer.Callback<R> A Callback for a Observer.

Method Summary

Modifier and Type	Method and Description
void	setCallback(Observer.Callback<R> metricUpdater) Sets a callback that gets executed every time before exporting this metric.

Method Detail

setCallback

void setCallback(Observer.Callback<R> metricUpdater)

Sets a callback that gets executed every time before exporting this metric.

Evaluation is deferred until needed, if this Observer metric is not exported then it will never be called.

Parameters:

metricUpdater - the callback to be executed before export.

Since:

0.1.0