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MicrometerMeterListenerTest.java
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MicrometerMeterListenerTest.java
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/*
* Copyright (c) 2022 VMware Inc. or its affiliates, All Rights Reserved.
*
* 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 reactor.core.observability.micrometer;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
import io.micrometer.core.instrument.Clock;
import io.micrometer.core.instrument.Counter;
import io.micrometer.core.instrument.Tags;
import io.micrometer.core.instrument.Timer;
import io.micrometer.core.instrument.simple.SimpleConfig;
import io.micrometer.core.instrument.simple.SimpleMeterRegistry;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatCode;
/**
* @author Simon Baslé
*/
class MicrometerMeterListenerTest {
SimpleMeterRegistry registry;
AtomicLong virtualClockTime;
Clock virtualClock;
MicrometerMeterListenerConfiguration configuration;
@BeforeEach
void initRegistry() {
virtualClockTime = new AtomicLong();
virtualClock = new Clock() {
@Override
public long wallTime() {
return virtualClockTime.get();
}
@Override
public long monotonicTime() {
return virtualClockTime.get();
}
};
registry = new SimpleMeterRegistry(SimpleConfig.DEFAULT, virtualClock);
configuration = new MicrometerMeterListenerConfiguration(
"testName",
Tags.of("testTag1", "testTagValue1","testTag2", "testTagValue2"),
registry,
false);
}
@Test
void initialStateFluxWithDefaultName() {
configuration = new MicrometerMeterListenerConfiguration(
Micrometer.DEFAULT_METER_PREFIX,
Tags.of("testTag1", "testTagValue1","testTag2", "testTagValue2"),
registry,
false);
MicrometerMeterListener<Integer> listener = new MicrometerMeterListener<>(configuration);
assertThat(listener.valued).as("valued").isFalse();
assertThat(listener.requestedCounter).as("requestedCounter disabled").isNull();
assertThat(listener.onNextIntervalTimer).as("onNextIntervalTimer").isNotNull();
assertThat(registry.getMetersAsString().split("\n"))
.as("registered meters: onNextIntervalTimer")
.containsExactly(
Micrometer.DEFAULT_METER_PREFIX + ".onNext.delay(TIMER)[testTag1='testTagValue1', testTag2='testTagValue2']; count=0.0, total_time=0.0 seconds, max=0.0 seconds"
);
assertThat(registry.remove(listener.onNextIntervalTimer))
.as("registry contains onNextIntervalTimer")
.isSameAs(listener.onNextIntervalTimer);
}
@Test
void initialStateFluxWithCustomName() {
configuration = new MicrometerMeterListenerConfiguration(
"testName",
Tags.of("testTag1", "testTagValue1","testTag2", "testTagValue2"),
registry,
false);
MicrometerMeterListener<Integer> listener = new MicrometerMeterListener<>(configuration);
assertThat(listener.valued).as("valued").isFalse();
assertThat(listener.requestedCounter).as("requestedCounter").isNotNull();
assertThat(listener.onNextIntervalTimer).as("onNextIntervalTimer").isNotNull();
assertThat(registry.getMetersAsString().split("\n"))
.as("registered meters: onNextIntervalTimer, requestedCounter")
.containsExactly(
"testName.onNext.delay(TIMER)[testTag1='testTagValue1', testTag2='testTagValue2']; count=0.0, total_time=0.0 seconds, max=0.0 seconds",
"testName.requested(DISTRIBUTION_SUMMARY)[testTag1='testTagValue1', testTag2='testTagValue2']; count=0.0, total=0.0, max=0.0"
);
assertThat(registry.remove(listener.onNextIntervalTimer))
.as("registry contains onNextIntervalTimer")
.isSameAs(listener.onNextIntervalTimer);
assertThat(registry.remove(listener.requestedCounter))
.as("registry contains requestedCounter")
.isSameAs(listener.requestedCounter);
}
@Test
void initialStateMono() {
configuration = new MicrometerMeterListenerConfiguration(
Micrometer.DEFAULT_METER_PREFIX,
Tags.of("testTag1", "testTagValue1","testTag2", "testTagValue2"),
registry,
true);
MicrometerMeterListener<Integer> listener = new MicrometerMeterListener<>(configuration);
assertThat(listener.valued).as("valued").isFalse();
assertThat(listener.requestedCounter).as("requestedCounter disabled").isNull();
assertThat(listener.onNextIntervalTimer).as("onNextIntervalTimer disabled").isNull();
assertThat(registry.getMetersAsString())
.as("no registered meters")
.isEmpty();
}
@Test
void timerSampleInitializedInSubscription() {
MicrometerMeterListener<Integer> listener = new MicrometerMeterListener<>(configuration);
assertThat(listener.subscribeToTerminateSample)
.as("subscribeToTerminateSample pre subscription")
.isNull();
assertThat(listener.lastNextEventNanos)
.as("lastNextEventNanos")
.isEqualTo(-1L);
assertThat(registry.getMeters())
.as("meters pre subscription")
.hasSize(2);
virtualClockTime.incrementAndGet();
listener.doOnSubscription();
assertThat(listener.subscribeToTerminateSample)
.as("subscribeToTerminateSample")
.isNotNull();
assertThat(listener.lastNextEventNanos)
.as("lastNextEventNanos")
.isEqualTo(1L);
assertThat(registry.getMeters())
.as("meters post subscription")
.hasSize(3);
assertThat(registry.find("testName" + MicrometerMeterListener.METER_SUBSCRIBED).counter())
.as("meter .subscribed")
.isNotNull()
.satisfies(meter -> assertThat(meter.count()).isEqualTo(1d));
}
@Test
void doOnCancelTimesFlowDurationMeter() {
MicrometerMeterListener<Integer> listener = new MicrometerMeterListener<>(configuration);
listener.doOnSubscription();
assertThat(registry.getMeters()).hasSize(3);
virtualClockTime.set(100);
listener.doOnCancel();
Timer timer = registry.find("testName" + MicrometerMeterListener.METER_FLOW_DURATION)
.timer();
assertThat(registry.getMeters()).hasSize(4);
assertThat(timer.getId().toString())
.as(".flow.duration with exception and status tags")
.isEqualTo("MeterId{name='testName.flow.duration', tags=[tag(exception=),tag(status=cancelled),tag(testTag1=testTagValue1),tag(testTag2=testTagValue2)]}");
assertThat(timer.totalTime(TimeUnit.NANOSECONDS))
.as("measured time")
.isEqualTo(100);
}
@Test
void doOnCompleteTimesFlowDurationMeter_completeEmpty() {
MicrometerMeterListener<Integer> listener = new MicrometerMeterListener<>(configuration);
listener.doOnSubscription();
assertThat(registry.getMeters()).hasSize(3);
virtualClockTime.set(100);
listener.doOnComplete();
Timer timer = registry.find("testName" + MicrometerMeterListener.METER_FLOW_DURATION)
.timer();
assertThat(registry.getMeters()).hasSize(4);
assertThat(timer.getId().toString())
.as(".flow.duration with exception and status tags")
.isEqualTo("MeterId{name='testName.flow.duration', tags=[tag(exception=),tag(status=completedEmpty),tag(testTag1=testTagValue1),tag(testTag2=testTagValue2)]}");
assertThat(timer.totalTime(TimeUnit.NANOSECONDS))
.as("measured time")
.isEqualTo(100);
}
@Test
void doOnCompleteTimesFlowDurationMeter_completeValued() {
MicrometerMeterListener<Integer> listener = new MicrometerMeterListener<>(configuration);
listener.doOnSubscription();
assertThat(registry.getMeters()).hasSize(3);
virtualClockTime.set(100);
listener.valued = true;
listener.doOnComplete();
Timer timer = registry.find("testName" + MicrometerMeterListener.METER_FLOW_DURATION)
.timer();
assertThat(registry.getMeters()).hasSize(4);
assertThat(timer.getId().toString())
.as(".flow.duration with exception and status tags")
.isEqualTo("MeterId{name='testName.flow.duration', tags=[tag(exception=),tag(status=completed),tag(testTag1=testTagValue1),tag(testTag2=testTagValue2)]}");
assertThat(timer.totalTime(TimeUnit.NANOSECONDS))
.as("measured time")
.isEqualTo(100);
}
@Test
void doOnErrorTimesFlowDurationMeter() {
MicrometerMeterListener<Integer> listener = new MicrometerMeterListener<>(configuration);
listener.doOnSubscription();
assertThat(registry.getMeters()).hasSize(3);
virtualClockTime.set(100);
listener.doOnError(new IllegalStateException("expected"));
Timer timer = registry.find("testName" + MicrometerMeterListener.METER_FLOW_DURATION)
.timer();
assertThat(registry.getMeters()).hasSize(4);
assertThat(timer.getId().toString())
.as(".flow.duration with exception and status tags")
.isEqualTo("MeterId{name='testName.flow.duration', tags=[tag(exception=java.lang.IllegalStateException),tag(status=error),tag(testTag1=testTagValue1),tag(testTag2=testTagValue2)]}");
assertThat(timer.totalTime(TimeUnit.NANOSECONDS))
.as("measured time")
.isEqualTo(100);
}
@Test
void doOnNextRecordsInterval() {
MicrometerMeterListener<Integer> listener = new MicrometerMeterListener<>(configuration);
listener.doOnSubscription();
virtualClockTime.set(100);
listener.doOnNext(1);
assertThat(listener.valued).as("valued").isTrue();
assertThat(listener.lastNextEventNanos).as("lastEventNanos recorded").isEqualTo(100);
assertThat(registry.find("testName" + MicrometerMeterListener.METER_FLOW_DURATION).meters())
.as("no flow.duration meter yet")
.isEmpty();
assertThat(listener.onNextIntervalTimer.totalTime(TimeUnit.NANOSECONDS))
.as("interval timed")
.isEqualTo(100);
assertThat(listener.onNextIntervalTimer.count())
.as("onNext count")
.isOne();
}
@Test
void doOnNextRecordsInterval_defaultName() {
configuration = new MicrometerMeterListenerConfiguration(Micrometer.DEFAULT_METER_PREFIX, Tags.empty(),
registry, false);
MicrometerMeterListener<Integer> listener = new MicrometerMeterListener<>(configuration);
listener.doOnSubscription();
virtualClockTime.set(100);
listener.doOnNext(1);
assertThat(listener.valued).as("valued").isTrue();
assertThat(listener.lastNextEventNanos).as("lastEventNanos recorded").isEqualTo(100);
assertThat(registry.find(Micrometer.DEFAULT_METER_PREFIX + MicrometerMeterListener.METER_FLOW_DURATION).meters())
.as("no flow.duration meter yet")
.isEmpty();
assertThat(listener.onNextIntervalTimer.totalTime(TimeUnit.NANOSECONDS))
.as("interval timed")
.isEqualTo(100);
assertThat(listener.onNextIntervalTimer.count())
.as("onNext count")
.isOne();
}
@Test
void doOnNext_monoRecordsCompletionOnly() {
configuration = new MicrometerMeterListenerConfiguration("testName", Tags.empty(),
registry, true);
MicrometerMeterListener<Integer> listener = new MicrometerMeterListener<>(configuration);
listener.doOnSubscription();
virtualClockTime.set(100);
listener.doOnNext(1);
assertThat(listener.valued).as("valued").isTrue();
assertThat(listener.lastNextEventNanos).as("no lastEventNanos recorded").isZero();
Timer timer = registry.find("testName" + MicrometerMeterListener.METER_FLOW_DURATION)
.timer();
assertThat(timer.getId().toString())
.as(".flow.duration with exception and status tags")
.isEqualTo("MeterId{name='testName.flow.duration', tags=[tag(exception=),tag(status=completed)]}");
assertThat(timer.totalTime(TimeUnit.NANOSECONDS))
.as("measured time")
.isEqualTo(100);
}
@Test
void doOnNextMultipleRecords() {
MicrometerMeterListener<Integer> listener = new MicrometerMeterListener<>(configuration);
listener.doOnSubscription();
virtualClockTime.set(100);
listener.doOnNext(1);
virtualClockTime.set(300);
listener.doOnNext(2);
assertThat(listener.onNextIntervalTimer.totalTime(TimeUnit.NANOSECONDS))
.as("total time")
.isEqualTo(300);
assertThat(listener.onNextIntervalTimer.count())
.as("onNext count")
.isEqualTo(2);
assertThat(listener.onNextIntervalTimer.max(TimeUnit.NANOSECONDS))
.as("onNext max interval")
.isEqualTo(200);
}
@Test
void doOnRequestRecordsTotalDemand() {
MicrometerMeterListener<Integer> listener = new MicrometerMeterListener<>(configuration);
listener.doOnRequest(100L);
assertThat(listener.requestedCounter.count()).as("1 request calls").isEqualTo(1);
assertThat(listener.requestedCounter.totalAmount()).as("total after first request").isEqualTo(100);
listener.doOnRequest(200L);
assertThat(listener.requestedCounter.count()).as("2 request calls").isEqualTo(2);
assertThat(listener.requestedCounter.totalAmount()).as("total after second request").isEqualTo(300);
assertThat(listener.requestedCounter.max()).as("max is second request").isEqualTo(200);
}
@Test
void doOnRequestMonoIgnoresRequest() {
configuration = new MicrometerMeterListenerConfiguration("testName", Tags.empty(), registry, true);
MicrometerMeterListener<Integer> listener = new MicrometerMeterListener<>(configuration);
assertThatCode(() -> listener.doOnRequest(100L)).doesNotThrowAnyException();
assertThat(listener.requestedCounter).isNull();
}
@Test
void doOnRequestDefaultNameIgnoresRequest() {
configuration = new MicrometerMeterListenerConfiguration(Micrometer.DEFAULT_METER_PREFIX, Tags.empty(), registry, false);
MicrometerMeterListener<Integer> listener = new MicrometerMeterListener<>(configuration);
assertThatCode(() -> listener.doOnRequest(100L)).doesNotThrowAnyException();
assertThat(listener.requestedCounter).isNull();
}
@Test
void malformedCounterCapturesNextCompleteError() {
MicrometerMeterListener<Integer> listener = new MicrometerMeterListener<>(configuration);
Counter malformedCounter = registry.find("testName" + MicrometerMeterListener.METER_MALFORMED).counter();
assertThat(malformedCounter).as("counter not registered").isNull();
listener.doOnMalformedOnNext(123);
malformedCounter = registry.find("testName" + MicrometerMeterListener.METER_MALFORMED).counter();
assertThat(malformedCounter).as("lazy counter registration").isNotNull();
assertThat(malformedCounter.count()).as("onNext malformed").isOne();
listener.doOnMalformedOnComplete();
assertThat(malformedCounter.count()).as("onComplete malformed").isEqualTo(2);
listener.doOnMalformedOnError(new IllegalStateException("expected, ignored"));
assertThat(malformedCounter.count()).as("onError malformed").isEqualTo(3);
}
}