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ObservationTests.java
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ObservationTests.java
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/*
* Copyright 2022 VMware, 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
*
* https://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.observation;
import org.junit.jupiter.api.Test;
import java.io.IOException;
import java.util.Random;
import static org.assertj.core.api.Assertions.assertThat;
/**
* Tests for {@link Observation}.
*
* @author Jonatan Ivanov
* @author Tommy Ludwig
* @author Marcin Grzejszczak
*/
class ObservationTests {
private final ObservationRegistry registry = ObservationRegistry.create();
@Test
void notHavingAnyHandlersShouldResultInNoopObservation() {
Observation observation = Observation.createNotStarted("foo", registry);
assertThat(observation).isSameAs(Observation.NOOP);
}
@Test
void notHavingARegistryShouldResultInNoopObservation() {
Observation observation = Observation.createNotStarted("foo", null);
assertThat(observation).isSameAs(Observation.NOOP);
}
@Test
void notMatchingObservationPredicateShouldResultInNoopObservation() {
registry.observationConfig().observationHandler(context -> true);
registry.observationConfig().observationPredicate((s, context) -> false);
Observation observation = Observation.createNotStarted("foo", registry);
assertThat(observation).isSameAs(Observation.NOOP);
}
@Test
void matchingPredicateAndHandlerShouldNotResultInNoopObservation() {
registry.observationConfig().observationHandler(context -> true);
registry.observationConfig().observationPredicate((s, context) -> true);
Observation observation = Observation.createNotStarted("foo", registry);
assertThat(observation).isNotSameAs(Observation.NOOP);
}
@Test
void havingAnObservationFilterWillMutateTheContext() {
registry.observationConfig().observationHandler(context -> true);
registry.observationConfig().observationFilter(context -> context.put("foo", "bar"));
Observation.Context context = new Observation.Context();
Observation.start("foo", context, registry).stop();
assertThat((String) context.get("foo")).isEqualTo("bar");
}
@Test
void settingParentObservationMakesAReferenceOnParentContext() {
registry.observationConfig().observationHandler(context -> true);
Observation.Context parentContext = new Observation.Context();
Observation parent = Observation.start("parent", parentContext, registry);
Observation.Context childContext = new Observation.Context();
Observation child = Observation.createNotStarted("child", childContext, registry).parentObservation(parent)
.start();
parent.stop();
child.stop();
assertThat(child.getContextView()).isSameAs(childContext);
assertThat(parent.getContextView()).isSameAs(parentContext);
assertThat(childContext.getParentObservation().getContextView()).isSameAs(parentContext);
}
@Test
void settingScopeMakesAReferenceOnParentContext() {
registry.observationConfig().observationHandler(context -> true);
Observation.Context parentContext = new Observation.Context();
Observation parent = Observation.start("parent", parentContext, registry);
Observation.Context childContext = new Observation.Context();
parent.scoped(() -> {
assertThat(childContext.getParentObservation()).isNull();
Observation.createNotStarted("child", childContext, registry).observe(() -> {
assertThat(childContext.getParentObservation().getContextView()).isSameAs(parentContext);
});
assertThat(childContext.getParentObservation()).isNull();
});
parent.stop();
assertThat(childContext.getParentObservation()).isNull();
}
@Test
void scopedCheckedSpecificException() {
Service service = new Service();
Observation observation = Observation.start("service", registry);
try {
String s = observation.scopedChecked(service::executeCallable);
observation.scopedChecked(service::executeRunnable);
}
catch (IOException ignore) {
}
}
static class Service {
String executeCallable() throws IOException {
if (new Random().nextBoolean()) {
throw new IOException();
}
return "";
}
void executeRunnable() throws IOException {
if (new Random().nextBoolean()) {
throw new IOException();
}
}
}
}