io.micrometer.core.samples.TimerSample Maven / Gradle / Ivy
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/**
* Copyright 2017 Pivotal Software, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.micrometer.core.samples;
import cern.jet.random.Normal;
import cern.jet.random.engine.MersenneTwister64;
import cern.jet.random.engine.RandomEngine;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Timer;
import io.micrometer.core.samples.utils.SampleRegistries;
import reactor.core.publisher.Flux;
import java.time.Duration;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
public class TimerSample {
public static void main(String[] args) {
MeterRegistry registry = SampleRegistries.influx();
Timer timer = Timer.builder("timer")
.publishPercentiles(0.5, 0.95)
.register(registry);
RandomEngine r = new MersenneTwister64(0);
Normal incomingRequests = new Normal(0, 1, r);
Normal duration = new Normal(250, 50, r);
AtomicInteger latencyForThisSecond = new AtomicInteger(duration.nextInt());
Flux.interval(Duration.ofSeconds(1))
.doOnEach(d -> latencyForThisSecond.set(duration.nextInt()))
.subscribe();
// the potential for an "incoming request" every 10 ms
Flux.interval(Duration.ofMillis(10))
.doOnEach(d -> {
if (incomingRequests.nextDouble() + 0.4 > 0) {
// pretend the request took some amount of time, such that the time is
// distributed normally with a mean of 250ms
timer.record(latencyForThisSecond.get(), TimeUnit.MILLISECONDS);
}
})
.blockLast();
}
}