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Record experiment results with a timer instead of a counter.

This commit is contained in:
Jon Chambers 2020-06-09 16:35:16 -04:00 committed by Jon Chambers
parent d980b8cfdc
commit 0713da7393
2 changed files with 32 additions and 21 deletions
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19
service/src/main/java/org/whispersystems/textsecuregcm/experiment/Experiment.java
View File

@ -9,13 +9,14 @@ import io.micrometer.core.instrument.Tag;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.TimeUnit;
/**
* An experiment compares the results of two operations and records metrics to assess how frequently they match.
*/
public class Experiment {
private final String counterName;
private final String timerName;
private final MeterRegistry meterRegistry;
static final String OUTCOME_TAG = "outcome";
@ -35,23 +36,29 @@ public class Experiment {
throw new IllegalArgumentException("Experiments must have a name");
}
this.counterName = MetricRegistry.name(getClass(), names);
this.timerName = MetricRegistry.name(getClass(), names);
this.meterRegistry = meterRegistry;
}
public <T> void compareResult(final T expected, final CompletionStage<T> experimentStage) {
// We're assuming that we get the experiment completion stage as soon as possible after it's started, but this
// start time will inescapably have some "wiggle" to it.
final long start = System.nanoTime();
experimentStage.whenComplete((actual, cause) -> {
final long duration = System.nanoTime() - start;
if (cause != null) {
meterRegistry.counter(counterName,
meterRegistry.timer(timerName,
List.of(Tag.of(OUTCOME_TAG, ERROR_OUTCOME), Tag.of(CAUSE_TAG, cause.getClass().getSimpleName())))
.increment();
.record(duration, TimeUnit.NANOSECONDS);
} else {
final boolean shouldIgnore = actual == null && expected != null;
if (!shouldIgnore) {
meterRegistry.counter(counterName,
meterRegistry.timer(timerName,
List.of(Tag.of(OUTCOME_TAG, Objects.equals(expected, actual) ? MATCH_OUTCOME : MISMATCH_OUTCOME)))
.increment();
.record(duration, TimeUnit.NANOSECONDS);
}
}
});

34
service/src/test/java/org/whispersystems/textsecuregcm/experiment/ExperimentTest.java
View File

@ -3,6 +3,7 @@ package org.whispersystems.textsecuregcm.experiment;
import io.micrometer.core.instrument.Counter;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Tag;
import io.micrometer.core.instrument.Timer;
import org.junit.Before;
import org.junit.Test;
import org.mockito.ArgumentCaptor;
@ -13,11 +14,14 @@ import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
import static org.junit.Assert.*;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyLong;
import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.ArgumentMatchers.anyVararg;
import static org.mockito.ArgumentMatchers.eq;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.verify;
@ -34,63 +38,63 @@ public class ExperimentTest {
@Test
public void compareResultMatch() {
final Counter counter = mock(Counter.class);
when(meterRegistry.counter(anyString(), ArgumentMatchers.<Iterable<Tag>>any())).thenReturn(counter);
final Timer timer = mock(Timer.class);
when(meterRegistry.timer(anyString(), ArgumentMatchers.<Iterable<Tag>>any())).thenReturn(timer);
new Experiment(meterRegistry, "test").compareResult(12, CompletableFuture.completedFuture(12));
@SuppressWarnings("unchecked") final ArgumentCaptor<Iterable<Tag>> tagCaptor = ArgumentCaptor.forClass(Iterable.class);
verify(meterRegistry).counter(anyString(), tagCaptor.capture());
verify(meterRegistry).timer(anyString(), tagCaptor.capture());
final Set<Tag> tags = getTagSet(tagCaptor.getValue());
assertEquals(tags, Set.of(Tag.of(Experiment.OUTCOME_TAG, Experiment.MATCH_OUTCOME)));
verify(counter).increment();
verify(timer).record(anyLong(), eq(TimeUnit.NANOSECONDS));
}
@Test
public void compareResultMismatch() {
final Counter counter = mock(Counter.class);
when(meterRegistry.counter(anyString(), ArgumentMatchers.<Iterable<Tag>>any())).thenReturn(counter);
final Timer timer = mock(Timer.class);
when(meterRegistry.timer(anyString(), ArgumentMatchers.<Iterable<Tag>>any())).thenReturn(timer);
new Experiment(meterRegistry, "test").compareResult(12, CompletableFuture.completedFuture(77));
@SuppressWarnings("unchecked") final ArgumentCaptor<Iterable<Tag>> tagCaptor = ArgumentCaptor.forClass(Iterable.class);
verify(meterRegistry).counter(anyString(), tagCaptor.capture());
verify(meterRegistry).timer(anyString(), tagCaptor.capture());
final Set<Tag> tags = getTagSet(tagCaptor.getValue());
assertEquals(tags, Set.of(Tag.of(Experiment.OUTCOME_TAG, Experiment.MISMATCH_OUTCOME)));
verify(counter).increment();
verify(timer).record(anyLong(), eq(TimeUnit.NANOSECONDS));
}
@Test
public void compareResultError() {
final Counter counter = mock(Counter.class);
when(meterRegistry.counter(anyString(), ArgumentMatchers.<Iterable<Tag>>any())).thenReturn(counter);
final Timer timer = mock(Timer.class);
when(meterRegistry.timer(anyString(), ArgumentMatchers.<Iterable<Tag>>any())).thenReturn(timer);
new Experiment(meterRegistry, "test").compareResult(12, CompletableFuture.failedFuture(new RuntimeException("OH NO")));
@SuppressWarnings("unchecked") final ArgumentCaptor<Iterable<Tag>> tagCaptor = ArgumentCaptor.forClass(Iterable.class);
verify(meterRegistry).counter(anyString(), tagCaptor.capture());
verify(meterRegistry).timer(anyString(), tagCaptor.capture());
final Set<Tag> tags = getTagSet(tagCaptor.getValue());
assertEquals(tags, Set.of(Tag.of(Experiment.OUTCOME_TAG, Experiment.ERROR_OUTCOME), Tag.of(Experiment.CAUSE_TAG, "RuntimeException")));
verify(counter).increment();
verify(timer).record(anyLong(), eq(TimeUnit.NANOSECONDS));
}
@Test
public void compareResultNoExperimentData() {
final Counter counter = mock(Counter.class);
when(meterRegistry.counter(anyString(), ArgumentMatchers.<Iterable<Tag>>any())).thenReturn(counter);
final Timer timer = mock(Timer.class);
when(meterRegistry.timer(anyString(), ArgumentMatchers.<Iterable<Tag>>any())).thenReturn(timer);
new Experiment(meterRegistry, "test").compareResult(12, CompletableFuture.completedFuture(null));
verify(counter, never()).increment();
verify(timer, never()).record(anyLong(), eq(TimeUnit.NANOSECONDS));
}
private static Set<Tag> getTagSet(final Iterable<Tag> tags) {