Interface TimerApi

All Known Subinterfaces:

DistributionDataPoint, GaugeDataPoint

All Known Implementing Classes:

Gauge, Histogram, Histogram.DataPoint, Summary, Summary.DataPoint

public interface TimerApi

Convenience API for timing durations.

Durations are recorded in seconds. The Prometheus instrumentation guidelines say: "Metrics must use base units (e.g. seconds, bytes) and leave converting them to something more readable to graphing tools".

Method Summary

Modifier and Type	Method	Description
Timer	startTimer()	Start a Timer.
default void	time(Runnable func)	Observe the duration of the func call.
default <T> T	time(Supplier<T> func)	Like time(Runnable), but returns the return value of func.
default <T> T	timeChecked(Callable<T> func)	Like time(Supplier), but func may throw a checked Exception.

Method Details

startTimer

Timer startTimer()

Start a Timer. Example:

Histogram histogram = Histogram.builder()
        .name("http_request_duration_seconds")
        .help("HTTP request service time in seconds")
        .unit(SECONDS)
        .labelNames("method", "path")
        .register();

try (Timer timer = histogram.labelValues("GET", "/").startTimer()) {
    // duration of this code block will be observed.
}

Durations are recorded in seconds. The Prometheus instrumentation guidelines say: "Metrics must use base units (e.g. seconds, bytes) and leave converting them to something more readable to graphing tools".

time

default void time(Runnable func)

Observe the duration of the func call. Example:

Histogram histogram = Histogram.builder()
        .name("request_duration_seconds")
        .help("HTTP request service time in seconds")
        .unit(SECONDS)
        .labelNames("method", "path")
        .register();

histogram2.labelValues("GET", "/").time(() -> {
    // duration of this code block will be observed.
});

Durations are recorded in seconds. The Prometheus instrumentation guidelines say: "Metrics must use base units (e.g. seconds, bytes) and leave converting them to something more readable to graphing tools".

time

default <T> T time(Supplier<T> func)

Like time(Runnable), but returns the return value of func.

timeChecked

default <T> T timeChecked(Callable<T> func)
                   throws Exception

Like time(Supplier), but func may throw a checked Exception.

Throws:

Exception