3ae92ff46c
* BAEL-5867: Create project and create first usage main method * BAEL-5867: Use Observation API in Boot * BAEL-5867: Refactoring and testing * BAEL-5867: Add tracing * BAEL-5867: Remove notes and add project as a module to the aggregator * BAEL-5867: Fix pmd rules violation
67 lines
2.7 KiB
Java
67 lines
2.7 KiB
Java
package com.baeldung.samples;
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import io.micrometer.core.instrument.Measurement;
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import io.micrometer.core.instrument.Statistic;
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import io.micrometer.core.instrument.observation.DefaultMeterObservationHandler;
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import io.micrometer.core.instrument.simple.SimpleMeterRegistry;
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import io.micrometer.observation.Observation;
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import io.micrometer.observation.ObservationRegistry;
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import io.micrometer.observation.ObservationTextPublisher;
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import java.util.Optional;
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import java.util.stream.StreamSupport;
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public class SimpleObservationApplication {
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// we can run this as a simple command line application
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public static void main(String[] args) {
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// create registry
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final var observationRegistry = ObservationRegistry.create();
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// create meter registry and observation handler
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final var meterRegistry = new SimpleMeterRegistry();
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final var meterObservationHandler = new DefaultMeterObservationHandler(meterRegistry);
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// create simple logging observation handler
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final var loggingObservationHandler = new ObservationTextPublisher(System.out::println);
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// register observation handlers
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observationRegistry
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.observationConfig()
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.observationHandler(meterObservationHandler)
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.observationHandler(loggingObservationHandler);
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// make an observation
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Observation.Context context = new Observation.Context();
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String observationName = "obs1";
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Observation observation = Observation
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.createNotStarted(observationName, () -> context, observationRegistry)
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.lowCardinalityKeyValue("gender", "male")
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.highCardinalityKeyValue("age", "41");
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for (int i = 0; i < 10; i++) {
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observation.observe(SimpleObservationApplication::doSomeAction);
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}
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meterRegistry.getMeters().forEach(m -> {
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System.out.println(m.getId() + "\n============");
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m.measure().forEach(ms -> System.out.println(ms.getValue() + " [" + ms.getStatistic() + "]"));
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System.out.println("----------------------------");
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});
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Optional<Double> maximumDuration = meterRegistry.getMeters().stream()
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.filter(m -> "obs1".equals(m.getId().getName()))
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.flatMap(m -> StreamSupport.stream(m.measure().spliterator(), false))
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.filter(ms -> ms.getStatistic() == Statistic.MAX)
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.findFirst()
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.map(Measurement::getValue);
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System.out.println(maximumDuration);
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}
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private static void doSomeAction() {
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try {
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Thread.sleep(Math.round(Math.random() * 1000));
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System.out.println("Hello World!");
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} catch (InterruptedException e) {
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throw new RuntimeException(e);
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}
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}
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}
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